[25] | 1 | /* |
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| 2 | * tclThreadTest.c -- |
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| 3 | * |
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| 4 | * This file implements the testthread command. Eventually this should be |
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| 5 | * tclThreadCmd.c |
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| 6 | * Some of this code is based on work done by Richard Hipp on behalf of |
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| 7 | * Conservation Through Innovation, Limited, with their permission. |
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| 8 | * |
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| 9 | * Copyright (c) 1998 by Sun Microsystems, Inc. |
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| 10 | * |
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| 11 | * See the file "license.terms" for information on usage and redistribution of |
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| 12 | * this file, and for a DISCLAIMER OF ALL WARRANTIES. |
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| 13 | * |
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| 14 | * RCS: @(#) $Id: tclThreadTest.c,v 1.24 2006/09/22 14:45:48 dkf Exp $ |
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| 15 | */ |
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| 16 | |
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| 17 | #include "tclInt.h" |
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| 18 | |
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| 19 | extern int Tcltest_Init(Tcl_Interp *interp); |
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| 20 | |
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| 21 | #ifdef TCL_THREADS |
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| 22 | /* |
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| 23 | * Each thread has an single instance of the following structure. There is one |
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| 24 | * instance of this structure per thread even if that thread contains multiple |
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| 25 | * interpreters. The interpreter identified by this structure is the main |
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| 26 | * interpreter for the thread. |
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| 27 | * |
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| 28 | * The main interpreter is the one that will process any messages received by |
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| 29 | * a thread. Any thread can send messages but only the main interpreter can |
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| 30 | * receive them. |
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| 31 | */ |
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| 32 | |
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| 33 | typedef struct ThreadSpecificData { |
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| 34 | Tcl_ThreadId threadId; /* Tcl ID for this thread */ |
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| 35 | Tcl_Interp *interp; /* Main interpreter for this thread */ |
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| 36 | int flags; /* See the TP_ defines below... */ |
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| 37 | struct ThreadSpecificData *nextPtr; /* List for "thread names" */ |
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| 38 | struct ThreadSpecificData *prevPtr; /* List for "thread names" */ |
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| 39 | } ThreadSpecificData; |
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| 40 | static Tcl_ThreadDataKey dataKey; |
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| 41 | |
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| 42 | /* |
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| 43 | * This list is used to list all threads that have interpreters. This is |
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| 44 | * protected by threadMutex. |
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| 45 | */ |
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| 46 | |
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| 47 | static struct ThreadSpecificData *threadList; |
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| 48 | |
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| 49 | /* |
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| 50 | * The following bit-values are legal for the "flags" field of the |
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| 51 | * ThreadSpecificData structure. |
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| 52 | */ |
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| 53 | #define TP_Dying 0x001 /* This thread is being cancelled */ |
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| 54 | |
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| 55 | /* |
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| 56 | * An instance of the following structure contains all information that is |
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| 57 | * passed into a new thread when the thread is created using either the |
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| 58 | * "thread create" Tcl command or the TclCreateThread() C function. |
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| 59 | */ |
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| 60 | |
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| 61 | typedef struct ThreadCtrl { |
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| 62 | char *script; /* The Tcl command this thread should |
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| 63 | * execute */ |
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| 64 | int flags; /* Initial value of the "flags" field in the |
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| 65 | * ThreadSpecificData structure for the new |
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| 66 | * thread. Might contain TP_Detached or |
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| 67 | * TP_TclThread. */ |
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| 68 | Tcl_Condition condWait; /* This condition variable is used to |
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| 69 | * synchronize the parent and child threads. |
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| 70 | * The child won't run until it acquires |
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| 71 | * threadMutex, and the parent function won't |
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| 72 | * complete until signaled on this condition |
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| 73 | * variable. */ |
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| 74 | } ThreadCtrl; |
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| 75 | |
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| 76 | /* |
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| 77 | * This is the event used to send scripts to other threads. |
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| 78 | */ |
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| 79 | |
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| 80 | typedef struct ThreadEvent { |
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| 81 | Tcl_Event event; /* Must be first */ |
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| 82 | char *script; /* The script to execute. */ |
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| 83 | struct ThreadEventResult *resultPtr; |
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| 84 | /* To communicate the result. This is NULL if |
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| 85 | * we don't care about it. */ |
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| 86 | } ThreadEvent; |
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| 87 | |
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| 88 | typedef struct ThreadEventResult { |
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| 89 | Tcl_Condition done; /* Signaled when the script completes */ |
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| 90 | int code; /* Return value of Tcl_Eval */ |
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| 91 | char *result; /* Result from the script */ |
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| 92 | char *errorInfo; /* Copy of errorInfo variable */ |
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| 93 | char *errorCode; /* Copy of errorCode variable */ |
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| 94 | Tcl_ThreadId srcThreadId; /* Id of sending thread, in case it dies */ |
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| 95 | Tcl_ThreadId dstThreadId; /* Id of target thread, in case it dies */ |
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| 96 | struct ThreadEvent *eventPtr; /* Back pointer */ |
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| 97 | struct ThreadEventResult *nextPtr; /* List for cleanup */ |
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| 98 | struct ThreadEventResult *prevPtr; |
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| 99 | |
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| 100 | } ThreadEventResult; |
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| 101 | |
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| 102 | static ThreadEventResult *resultList; |
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| 103 | |
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| 104 | /* |
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| 105 | * This is for simple error handling when a thread script exits badly. |
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| 106 | */ |
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| 107 | |
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| 108 | static Tcl_ThreadId errorThreadId; |
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| 109 | static char *errorProcString; |
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| 110 | |
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| 111 | /* |
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| 112 | * Access to the list of threads and to the thread send results is guarded by |
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| 113 | * this mutex. |
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| 114 | */ |
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| 115 | |
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| 116 | TCL_DECLARE_MUTEX(threadMutex) |
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| 117 | |
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| 118 | #undef TCL_STORAGE_CLASS |
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| 119 | #define TCL_STORAGE_CLASS DLLEXPORT |
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| 120 | |
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| 121 | EXTERN int TclThread_Init(Tcl_Interp *interp); |
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| 122 | EXTERN int Tcl_ThreadObjCmd(ClientData clientData, |
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| 123 | Tcl_Interp *interp, int objc, |
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| 124 | Tcl_Obj *const objv[]); |
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| 125 | EXTERN int TclCreateThread(Tcl_Interp *interp, char *script, |
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| 126 | int joinable); |
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| 127 | EXTERN int TclThreadList(Tcl_Interp *interp); |
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| 128 | EXTERN int TclThreadSend(Tcl_Interp *interp, Tcl_ThreadId id, |
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| 129 | char *script, int wait); |
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| 130 | |
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| 131 | #undef TCL_STORAGE_CLASS |
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| 132 | #define TCL_STORAGE_CLASS DLLIMPORT |
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| 133 | |
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| 134 | Tcl_ThreadCreateType NewTestThread(ClientData clientData); |
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| 135 | static void ListRemove(ThreadSpecificData *tsdPtr); |
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| 136 | static void ListUpdateInner(ThreadSpecificData *tsdPtr); |
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| 137 | static int ThreadEventProc(Tcl_Event *evPtr, int mask); |
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| 138 | static void ThreadErrorProc(Tcl_Interp *interp); |
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| 139 | static void ThreadFreeProc(ClientData clientData); |
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| 140 | static int ThreadDeleteEvent(Tcl_Event *eventPtr, |
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| 141 | ClientData clientData); |
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| 142 | static void ThreadExitProc(ClientData clientData); |
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| 143 | |
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| 144 | /* |
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| 145 | *---------------------------------------------------------------------- |
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| 146 | * |
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| 147 | * TclThread_Init -- |
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| 148 | * |
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| 149 | * Initialize the test thread command. |
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| 150 | * |
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| 151 | * Results: |
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| 152 | * TCL_OK if the package was properly initialized. |
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| 153 | * |
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| 154 | * Side effects: |
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| 155 | * Add the "testthread" command to the interp. |
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| 156 | * |
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| 157 | *---------------------------------------------------------------------- |
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| 158 | */ |
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| 159 | |
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| 160 | int |
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| 161 | TclThread_Init( |
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| 162 | Tcl_Interp *interp) /* The current Tcl interpreter */ |
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| 163 | { |
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| 164 | |
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| 165 | Tcl_CreateObjCommand(interp, "testthread", Tcl_ThreadObjCmd, |
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| 166 | (ClientData) NULL, NULL); |
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| 167 | return TCL_OK; |
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| 168 | } |
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| 169 | |
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| 170 | |
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| 171 | /* |
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| 172 | *---------------------------------------------------------------------- |
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| 173 | * |
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| 174 | * Tcl_ThreadObjCmd -- |
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| 175 | * |
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| 176 | * This procedure is invoked to process the "testthread" Tcl command. See |
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| 177 | * the user documentation for details on what it does. |
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| 178 | * |
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| 179 | * thread create ?-joinable? ?script? |
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| 180 | * thread send id ?-async? script |
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| 181 | * thread exit |
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| 182 | * thread info id |
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| 183 | * thread names |
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| 184 | * thread wait |
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| 185 | * thread errorproc proc |
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| 186 | * thread join id |
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| 187 | * |
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| 188 | * Results: |
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| 189 | * A standard Tcl result. |
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| 190 | * |
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| 191 | * Side effects: |
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| 192 | * See the user documentation. |
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| 193 | * |
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| 194 | *---------------------------------------------------------------------- |
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| 195 | */ |
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| 196 | |
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| 197 | /* ARGSUSED */ |
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| 198 | int |
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| 199 | Tcl_ThreadObjCmd( |
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| 200 | ClientData dummy, /* Not used. */ |
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| 201 | Tcl_Interp *interp, /* Current interpreter. */ |
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| 202 | int objc, /* Number of arguments. */ |
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| 203 | Tcl_Obj *const objv[]) /* Argument objects. */ |
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| 204 | { |
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| 205 | ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); |
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| 206 | int option; |
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| 207 | static const char *threadOptions[] = { |
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| 208 | "create", "exit", "id", "join", "names", |
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| 209 | "send", "wait", "errorproc", NULL |
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| 210 | }; |
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| 211 | enum options { |
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| 212 | THREAD_CREATE, THREAD_EXIT, THREAD_ID, THREAD_JOIN, THREAD_NAMES, |
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| 213 | THREAD_SEND, THREAD_WAIT, THREAD_ERRORPROC |
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| 214 | }; |
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| 215 | |
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| 216 | if (objc < 2) { |
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| 217 | Tcl_WrongNumArgs(interp, 1, objv, "option ?args?"); |
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| 218 | return TCL_ERROR; |
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| 219 | } |
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| 220 | if (Tcl_GetIndexFromObj(interp, objv[1], threadOptions, "option", 0, |
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| 221 | &option) != TCL_OK) { |
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| 222 | return TCL_ERROR; |
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| 223 | } |
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| 224 | |
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| 225 | /* |
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| 226 | * Make sure the initial thread is on the list before doing anything. |
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| 227 | */ |
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| 228 | |
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| 229 | if (tsdPtr->interp == NULL) { |
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| 230 | Tcl_MutexLock(&threadMutex); |
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| 231 | tsdPtr->interp = interp; |
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| 232 | ListUpdateInner(tsdPtr); |
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| 233 | Tcl_CreateThreadExitHandler(ThreadExitProc, NULL); |
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| 234 | Tcl_MutexUnlock(&threadMutex); |
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| 235 | } |
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| 236 | |
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| 237 | switch ((enum options)option) { |
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| 238 | case THREAD_CREATE: { |
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| 239 | char *script; |
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| 240 | int joinable, len; |
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| 241 | |
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| 242 | if (objc == 2) { |
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| 243 | /* |
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| 244 | * Neither joinable nor special script |
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| 245 | */ |
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| 246 | |
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| 247 | joinable = 0; |
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| 248 | script = "testthread wait"; /* Just enter event loop */ |
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| 249 | } else if (objc == 3) { |
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| 250 | /* |
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| 251 | * Possibly -joinable, then no special script, no joinable, then |
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| 252 | * its a script. |
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| 253 | */ |
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| 254 | |
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| 255 | script = Tcl_GetStringFromObj(objv[2], &len); |
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| 256 | |
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| 257 | if ((len > 1) && |
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| 258 | (script [0] == '-') && (script [1] == 'j') && |
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| 259 | (0 == strncmp (script, "-joinable", (size_t) len))) { |
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| 260 | joinable = 1; |
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| 261 | script = "testthread wait"; /* Just enter event loop */ |
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| 262 | } else { |
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| 263 | /* |
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| 264 | * Remember the script |
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| 265 | */ |
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| 266 | |
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| 267 | joinable = 0; |
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| 268 | } |
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| 269 | } else if (objc == 4) { |
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| 270 | /* |
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| 271 | * Definitely a script available, but is the flag -joinable? |
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| 272 | */ |
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| 273 | |
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| 274 | script = Tcl_GetStringFromObj(objv[2], &len); |
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| 275 | |
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| 276 | joinable = ((len > 1) && |
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| 277 | (script [0] == '-') && (script [1] == 'j') && |
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| 278 | (0 == strncmp(script, "-joinable", (size_t) len))); |
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| 279 | |
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| 280 | script = Tcl_GetString(objv[3]); |
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| 281 | } else { |
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| 282 | Tcl_WrongNumArgs(interp, 2, objv, "?-joinable? ?script?"); |
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| 283 | return TCL_ERROR; |
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| 284 | } |
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| 285 | return TclCreateThread(interp, script, joinable); |
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| 286 | } |
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| 287 | case THREAD_EXIT: |
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| 288 | if (objc > 2) { |
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| 289 | Tcl_WrongNumArgs(interp, 2, objv, NULL); |
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| 290 | return TCL_ERROR; |
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| 291 | } |
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| 292 | ListRemove(NULL); |
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| 293 | Tcl_ExitThread(0); |
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| 294 | return TCL_OK; |
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| 295 | case THREAD_ID: |
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| 296 | if (objc == 2) { |
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| 297 | Tcl_Obj *idObj = Tcl_NewLongObj((long) Tcl_GetCurrentThread()); |
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| 298 | |
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| 299 | Tcl_SetObjResult(interp, idObj); |
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| 300 | return TCL_OK; |
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| 301 | } else { |
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| 302 | Tcl_WrongNumArgs(interp, 2, objv, NULL); |
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| 303 | return TCL_ERROR; |
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| 304 | } |
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| 305 | case THREAD_JOIN: { |
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| 306 | long id; |
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| 307 | int result, status; |
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| 308 | |
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| 309 | if (objc != 3) { |
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| 310 | Tcl_WrongNumArgs(interp, 2, objv, "id"); |
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| 311 | return TCL_ERROR; |
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| 312 | } |
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| 313 | if (Tcl_GetLongFromObj(interp, objv[2], &id) != TCL_OK) { |
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| 314 | return TCL_ERROR; |
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| 315 | } |
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| 316 | |
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| 317 | result = Tcl_JoinThread ((Tcl_ThreadId) id, &status); |
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| 318 | if (result == TCL_OK) { |
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| 319 | Tcl_SetIntObj (Tcl_GetObjResult (interp), status); |
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| 320 | } else { |
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| 321 | char buf [20]; |
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| 322 | |
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| 323 | sprintf(buf, "%ld", id); |
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| 324 | Tcl_AppendResult(interp, "cannot join thread ", buf, NULL); |
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| 325 | } |
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| 326 | return result; |
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| 327 | } |
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| 328 | case THREAD_NAMES: |
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| 329 | if (objc > 2) { |
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| 330 | Tcl_WrongNumArgs(interp, 2, objv, NULL); |
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| 331 | return TCL_ERROR; |
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| 332 | } |
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| 333 | return TclThreadList(interp); |
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| 334 | case THREAD_SEND: { |
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| 335 | long id; |
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| 336 | char *script; |
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| 337 | int wait, arg; |
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| 338 | |
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| 339 | if ((objc != 4) && (objc != 5)) { |
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| 340 | Tcl_WrongNumArgs(interp, 2, objv, "?-async? id script"); |
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| 341 | return TCL_ERROR; |
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| 342 | } |
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| 343 | if (objc == 5) { |
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| 344 | if (strcmp("-async", Tcl_GetString(objv[2])) != 0) { |
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| 345 | Tcl_WrongNumArgs(interp, 2, objv, "?-async? id script"); |
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| 346 | return TCL_ERROR; |
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| 347 | } |
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| 348 | wait = 0; |
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| 349 | arg = 3; |
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| 350 | } else { |
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| 351 | wait = 1; |
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| 352 | arg = 2; |
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| 353 | } |
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| 354 | if (Tcl_GetLongFromObj(interp, objv[arg], &id) != TCL_OK) { |
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| 355 | return TCL_ERROR; |
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| 356 | } |
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| 357 | arg++; |
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| 358 | script = Tcl_GetString(objv[arg]); |
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| 359 | return TclThreadSend(interp, (Tcl_ThreadId) id, script, wait); |
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| 360 | } |
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| 361 | case THREAD_ERRORPROC: { |
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| 362 | /* |
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| 363 | * Arrange for this proc to handle thread death errors. |
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| 364 | */ |
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| 365 | |
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| 366 | char *proc; |
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| 367 | |
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| 368 | if (objc != 3) { |
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| 369 | Tcl_WrongNumArgs(interp, 2, objv, "proc"); |
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| 370 | return TCL_ERROR; |
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| 371 | } |
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| 372 | Tcl_MutexLock(&threadMutex); |
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| 373 | errorThreadId = Tcl_GetCurrentThread(); |
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| 374 | if (errorProcString) { |
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| 375 | ckfree(errorProcString); |
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| 376 | } |
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| 377 | proc = Tcl_GetString(objv[2]); |
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| 378 | errorProcString = ckalloc(strlen(proc)+1); |
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| 379 | strcpy(errorProcString, proc); |
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| 380 | Tcl_MutexUnlock(&threadMutex); |
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| 381 | return TCL_OK; |
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| 382 | } |
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| 383 | case THREAD_WAIT: |
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| 384 | while (1) { |
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| 385 | (void) Tcl_DoOneEvent(TCL_ALL_EVENTS); |
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| 386 | } |
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| 387 | } |
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| 388 | return TCL_OK; |
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| 389 | } |
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| 390 | |
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| 391 | /* |
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| 392 | *---------------------------------------------------------------------- |
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| 393 | * |
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| 394 | * TclCreateThread -- |
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| 395 | * |
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| 396 | * This procedure is invoked to create a thread containing an interp to |
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| 397 | * run a script. This returns after the thread has started executing. |
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| 398 | * |
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| 399 | * Results: |
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| 400 | * A standard Tcl result, which is the thread ID. |
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| 401 | * |
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| 402 | * Side effects: |
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| 403 | * Create a thread. |
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| 404 | * |
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| 405 | *---------------------------------------------------------------------- |
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| 406 | */ |
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| 407 | |
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| 408 | /* ARGSUSED */ |
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| 409 | int |
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| 410 | TclCreateThread( |
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| 411 | Tcl_Interp *interp, /* Current interpreter. */ |
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| 412 | char *script, /* Script to execute */ |
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| 413 | int joinable) /* Flag, joinable thread or not */ |
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| 414 | { |
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| 415 | ThreadCtrl ctrl; |
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| 416 | Tcl_ThreadId id; |
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| 417 | |
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| 418 | ctrl.script = script; |
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| 419 | ctrl.condWait = NULL; |
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| 420 | ctrl.flags = 0; |
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| 421 | |
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| 422 | joinable = joinable ? TCL_THREAD_JOINABLE : TCL_THREAD_NOFLAGS; |
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| 423 | |
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| 424 | Tcl_MutexLock(&threadMutex); |
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| 425 | if (Tcl_CreateThread(&id, NewTestThread, (ClientData) &ctrl, |
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| 426 | TCL_THREAD_STACK_DEFAULT, joinable) != TCL_OK) { |
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| 427 | Tcl_MutexUnlock(&threadMutex); |
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| 428 | Tcl_AppendResult(interp, "can't create a new thread", NULL); |
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| 429 | ckfree((char *) ctrl.script); |
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| 430 | return TCL_ERROR; |
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| 431 | } |
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| 432 | |
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| 433 | /* |
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| 434 | * Wait for the thread to start because it is using something on our stack! |
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| 435 | */ |
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| 436 | |
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| 437 | Tcl_ConditionWait(&ctrl.condWait, &threadMutex, NULL); |
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| 438 | Tcl_MutexUnlock(&threadMutex); |
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| 439 | Tcl_ConditionFinalize(&ctrl.condWait); |
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| 440 | Tcl_SetObjResult(interp, Tcl_NewLongObj((long)id)); |
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| 441 | return TCL_OK; |
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| 442 | } |
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| 443 | |
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| 444 | /* |
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| 445 | *------------------------------------------------------------------------ |
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| 446 | * |
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| 447 | * NewTestThread -- |
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| 448 | * |
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| 449 | * This routine is the "main()" for a new thread whose task is to execute |
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| 450 | * a single Tcl script. The argument to this function is a pointer to a |
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| 451 | * structure that contains the text of the TCL script to be executed. |
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| 452 | * |
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| 453 | * Space to hold the script field of the ThreadControl structure passed |
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| 454 | * in as the only argument was obtained from malloc() and must be freed |
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| 455 | * by this function before it exits. Space to hold the ThreadControl |
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| 456 | * structure itself is released by the calling function, and the two |
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| 457 | * condition variables in the ThreadControl structure are destroyed by |
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| 458 | * the calling function. The calling function will destroy the |
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| 459 | * ThreadControl structure and the condition variable as soon as |
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| 460 | * ctrlPtr->condWait is signaled, so this routine must make copies of any |
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| 461 | * data it might need after that point. |
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| 462 | * |
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| 463 | * Results: |
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| 464 | * None |
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| 465 | * |
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| 466 | * Side effects: |
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| 467 | * A Tcl script is executed in a new thread. |
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| 468 | * |
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| 469 | *------------------------------------------------------------------------ |
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| 470 | */ |
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| 471 | |
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| 472 | Tcl_ThreadCreateType |
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| 473 | NewTestThread( |
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| 474 | ClientData clientData) |
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| 475 | { |
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| 476 | ThreadCtrl *ctrlPtr = (ThreadCtrl*)clientData; |
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| 477 | ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); |
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| 478 | int result; |
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| 479 | char *threadEvalScript; |
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| 480 | |
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| 481 | /* |
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| 482 | * Initialize the interpreter. This should be more general. |
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| 483 | */ |
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| 484 | |
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| 485 | tsdPtr->interp = Tcl_CreateInterp(); |
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| 486 | result = Tcl_Init(tsdPtr->interp); |
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| 487 | result = TclThread_Init(tsdPtr->interp); |
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| 488 | |
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| 489 | /* |
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| 490 | * This is part of the test facility. Initialize _ALL_ test commands for |
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| 491 | * use by the new thread. |
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| 492 | */ |
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| 493 | |
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| 494 | result = Tcltest_Init(tsdPtr->interp); |
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| 495 | |
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| 496 | /* |
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| 497 | * Update the list of threads. |
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| 498 | */ |
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| 499 | |
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| 500 | Tcl_MutexLock(&threadMutex); |
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| 501 | ListUpdateInner(tsdPtr); |
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| 502 | |
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| 503 | /* |
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| 504 | * We need to keep a pointer to the alloc'ed mem of the script we are |
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| 505 | * eval'ing, for the case that we exit during evaluation |
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| 506 | */ |
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| 507 | |
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| 508 | threadEvalScript = ckalloc(strlen(ctrlPtr->script)+1); |
---|
| 509 | strcpy(threadEvalScript, ctrlPtr->script); |
---|
| 510 | |
---|
| 511 | Tcl_CreateThreadExitHandler(ThreadExitProc, (ClientData) threadEvalScript); |
---|
| 512 | |
---|
| 513 | /* |
---|
| 514 | * Notify the parent we are alive. |
---|
| 515 | */ |
---|
| 516 | |
---|
| 517 | Tcl_ConditionNotify(&ctrlPtr->condWait); |
---|
| 518 | Tcl_MutexUnlock(&threadMutex); |
---|
| 519 | |
---|
| 520 | /* |
---|
| 521 | * Run the script. |
---|
| 522 | */ |
---|
| 523 | |
---|
| 524 | Tcl_Preserve((ClientData) tsdPtr->interp); |
---|
| 525 | result = Tcl_Eval(tsdPtr->interp, threadEvalScript); |
---|
| 526 | if (result != TCL_OK) { |
---|
| 527 | ThreadErrorProc(tsdPtr->interp); |
---|
| 528 | } |
---|
| 529 | |
---|
| 530 | /* |
---|
| 531 | * Clean up. |
---|
| 532 | */ |
---|
| 533 | |
---|
| 534 | ListRemove(tsdPtr); |
---|
| 535 | Tcl_Release((ClientData) tsdPtr->interp); |
---|
| 536 | Tcl_DeleteInterp(tsdPtr->interp); |
---|
| 537 | Tcl_ExitThread(result); |
---|
| 538 | |
---|
| 539 | TCL_THREAD_CREATE_RETURN; |
---|
| 540 | } |
---|
| 541 | |
---|
| 542 | /* |
---|
| 543 | *------------------------------------------------------------------------ |
---|
| 544 | * |
---|
| 545 | * ThreadErrorProc -- |
---|
| 546 | * |
---|
| 547 | * Send a message to the thread willing to hear about errors. |
---|
| 548 | * |
---|
| 549 | * Results: |
---|
| 550 | * None |
---|
| 551 | * |
---|
| 552 | * Side effects: |
---|
| 553 | * Send an event. |
---|
| 554 | * |
---|
| 555 | *------------------------------------------------------------------------ |
---|
| 556 | */ |
---|
| 557 | |
---|
| 558 | static void |
---|
| 559 | ThreadErrorProc( |
---|
| 560 | Tcl_Interp *interp) /* Interp that failed */ |
---|
| 561 | { |
---|
| 562 | Tcl_Channel errChannel; |
---|
| 563 | const char *errorInfo, *argv[3]; |
---|
| 564 | char *script; |
---|
| 565 | char buf[TCL_DOUBLE_SPACE+1]; |
---|
| 566 | sprintf(buf, "%ld", (long) Tcl_GetCurrentThread()); |
---|
| 567 | |
---|
| 568 | errorInfo = Tcl_GetVar(interp, "errorInfo", TCL_GLOBAL_ONLY); |
---|
| 569 | if (errorProcString == NULL) { |
---|
| 570 | errChannel = Tcl_GetStdChannel(TCL_STDERR); |
---|
| 571 | Tcl_WriteChars(errChannel, "Error from thread ", -1); |
---|
| 572 | Tcl_WriteChars(errChannel, buf, -1); |
---|
| 573 | Tcl_WriteChars(errChannel, "\n", 1); |
---|
| 574 | Tcl_WriteChars(errChannel, errorInfo, -1); |
---|
| 575 | Tcl_WriteChars(errChannel, "\n", 1); |
---|
| 576 | } else { |
---|
| 577 | argv[0] = errorProcString; |
---|
| 578 | argv[1] = buf; |
---|
| 579 | argv[2] = errorInfo; |
---|
| 580 | script = Tcl_Merge(3, argv); |
---|
| 581 | TclThreadSend(interp, errorThreadId, script, 0); |
---|
| 582 | ckfree(script); |
---|
| 583 | } |
---|
| 584 | } |
---|
| 585 | |
---|
| 586 | |
---|
| 587 | /* |
---|
| 588 | *------------------------------------------------------------------------ |
---|
| 589 | * |
---|
| 590 | * ListUpdateInner -- |
---|
| 591 | * |
---|
| 592 | * Add the thread local storage to the list. This assumes the caller has |
---|
| 593 | * obtained the mutex. |
---|
| 594 | * |
---|
| 595 | * Results: |
---|
| 596 | * None |
---|
| 597 | * |
---|
| 598 | * Side effects: |
---|
| 599 | * Add the thread local storage to its list. |
---|
| 600 | * |
---|
| 601 | *------------------------------------------------------------------------ |
---|
| 602 | */ |
---|
| 603 | |
---|
| 604 | static void |
---|
| 605 | ListUpdateInner( |
---|
| 606 | ThreadSpecificData *tsdPtr) |
---|
| 607 | { |
---|
| 608 | if (tsdPtr == NULL) { |
---|
| 609 | tsdPtr = TCL_TSD_INIT(&dataKey); |
---|
| 610 | } |
---|
| 611 | tsdPtr->threadId = Tcl_GetCurrentThread(); |
---|
| 612 | tsdPtr->nextPtr = threadList; |
---|
| 613 | if (threadList) { |
---|
| 614 | threadList->prevPtr = tsdPtr; |
---|
| 615 | } |
---|
| 616 | tsdPtr->prevPtr = NULL; |
---|
| 617 | threadList = tsdPtr; |
---|
| 618 | } |
---|
| 619 | |
---|
| 620 | /* |
---|
| 621 | *------------------------------------------------------------------------ |
---|
| 622 | * |
---|
| 623 | * ListRemove -- |
---|
| 624 | * |
---|
| 625 | * Remove the thread local storage from its list. This grabs the mutex to |
---|
| 626 | * protect the list. |
---|
| 627 | * |
---|
| 628 | * Results: |
---|
| 629 | * None |
---|
| 630 | * |
---|
| 631 | * Side effects: |
---|
| 632 | * Remove the thread local storage from its list. |
---|
| 633 | * |
---|
| 634 | *------------------------------------------------------------------------ |
---|
| 635 | */ |
---|
| 636 | |
---|
| 637 | static void |
---|
| 638 | ListRemove( |
---|
| 639 | ThreadSpecificData *tsdPtr) |
---|
| 640 | { |
---|
| 641 | if (tsdPtr == NULL) { |
---|
| 642 | tsdPtr = TCL_TSD_INIT(&dataKey); |
---|
| 643 | } |
---|
| 644 | Tcl_MutexLock(&threadMutex); |
---|
| 645 | if (tsdPtr->prevPtr) { |
---|
| 646 | tsdPtr->prevPtr->nextPtr = tsdPtr->nextPtr; |
---|
| 647 | } else { |
---|
| 648 | threadList = tsdPtr->nextPtr; |
---|
| 649 | } |
---|
| 650 | if (tsdPtr->nextPtr) { |
---|
| 651 | tsdPtr->nextPtr->prevPtr = tsdPtr->prevPtr; |
---|
| 652 | } |
---|
| 653 | tsdPtr->nextPtr = tsdPtr->prevPtr = 0; |
---|
| 654 | Tcl_MutexUnlock(&threadMutex); |
---|
| 655 | } |
---|
| 656 | |
---|
| 657 | /* |
---|
| 658 | *------------------------------------------------------------------------ |
---|
| 659 | * |
---|
| 660 | * TclThreadList -- |
---|
| 661 | * |
---|
| 662 | * Return a list of threads running Tcl interpreters. |
---|
| 663 | * |
---|
| 664 | * Results: |
---|
| 665 | * A standard Tcl result. |
---|
| 666 | * |
---|
| 667 | * Side effects: |
---|
| 668 | * None. |
---|
| 669 | * |
---|
| 670 | *------------------------------------------------------------------------ |
---|
| 671 | */ |
---|
| 672 | int |
---|
| 673 | TclThreadList( |
---|
| 674 | Tcl_Interp *interp) |
---|
| 675 | { |
---|
| 676 | ThreadSpecificData *tsdPtr; |
---|
| 677 | Tcl_Obj *listPtr; |
---|
| 678 | |
---|
| 679 | listPtr = Tcl_NewListObj(0, NULL); |
---|
| 680 | Tcl_MutexLock(&threadMutex); |
---|
| 681 | for (tsdPtr = threadList ; tsdPtr ; tsdPtr = tsdPtr->nextPtr) { |
---|
| 682 | Tcl_ListObjAppendElement(interp, listPtr, |
---|
| 683 | Tcl_NewLongObj((long) tsdPtr->threadId)); |
---|
| 684 | } |
---|
| 685 | Tcl_MutexUnlock(&threadMutex); |
---|
| 686 | Tcl_SetObjResult(interp, listPtr); |
---|
| 687 | return TCL_OK; |
---|
| 688 | } |
---|
| 689 | |
---|
| 690 | /* |
---|
| 691 | *------------------------------------------------------------------------ |
---|
| 692 | * |
---|
| 693 | * TclThreadSend -- |
---|
| 694 | * |
---|
| 695 | * Send a script to another thread. |
---|
| 696 | * |
---|
| 697 | * Results: |
---|
| 698 | * A standard Tcl result. |
---|
| 699 | * |
---|
| 700 | * Side effects: |
---|
| 701 | * None. |
---|
| 702 | * |
---|
| 703 | *------------------------------------------------------------------------ |
---|
| 704 | */ |
---|
| 705 | |
---|
| 706 | int |
---|
| 707 | TclThreadSend( |
---|
| 708 | Tcl_Interp *interp, /* The current interpreter. */ |
---|
| 709 | Tcl_ThreadId id, /* Thread Id of other interpreter. */ |
---|
| 710 | char *script, /* The script to evaluate. */ |
---|
| 711 | int wait) /* If 1, we block for the result. */ |
---|
| 712 | { |
---|
| 713 | ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); |
---|
| 714 | ThreadEvent *threadEventPtr; |
---|
| 715 | ThreadEventResult *resultPtr; |
---|
| 716 | int found, code; |
---|
| 717 | Tcl_ThreadId threadId = (Tcl_ThreadId) id; |
---|
| 718 | |
---|
| 719 | /* |
---|
| 720 | * Verify the thread exists. |
---|
| 721 | */ |
---|
| 722 | |
---|
| 723 | Tcl_MutexLock(&threadMutex); |
---|
| 724 | found = 0; |
---|
| 725 | for (tsdPtr = threadList ; tsdPtr ; tsdPtr = tsdPtr->nextPtr) { |
---|
| 726 | if (tsdPtr->threadId == threadId) { |
---|
| 727 | found = 1; |
---|
| 728 | break; |
---|
| 729 | } |
---|
| 730 | } |
---|
| 731 | if (!found) { |
---|
| 732 | Tcl_MutexUnlock(&threadMutex); |
---|
| 733 | Tcl_AppendResult(interp, "invalid thread id", NULL); |
---|
| 734 | return TCL_ERROR; |
---|
| 735 | } |
---|
| 736 | |
---|
| 737 | /* |
---|
| 738 | * Short circut sends to ourself. Ought to do something with -async, like |
---|
| 739 | * run in an idle handler. |
---|
| 740 | */ |
---|
| 741 | |
---|
| 742 | if (threadId == Tcl_GetCurrentThread()) { |
---|
| 743 | Tcl_MutexUnlock(&threadMutex); |
---|
| 744 | return Tcl_GlobalEval(interp, script); |
---|
| 745 | } |
---|
| 746 | |
---|
| 747 | /* |
---|
| 748 | * Create the event for its event queue. |
---|
| 749 | */ |
---|
| 750 | |
---|
| 751 | threadEventPtr = (ThreadEvent *) ckalloc(sizeof(ThreadEvent)); |
---|
| 752 | threadEventPtr->script = ckalloc(strlen(script) + 1); |
---|
| 753 | strcpy(threadEventPtr->script, script); |
---|
| 754 | if (!wait) { |
---|
| 755 | resultPtr = threadEventPtr->resultPtr = NULL; |
---|
| 756 | } else { |
---|
| 757 | resultPtr = (ThreadEventResult *) ckalloc(sizeof(ThreadEventResult)); |
---|
| 758 | threadEventPtr->resultPtr = resultPtr; |
---|
| 759 | |
---|
| 760 | /* |
---|
| 761 | * Initialize the result fields. |
---|
| 762 | */ |
---|
| 763 | |
---|
| 764 | resultPtr->done = NULL; |
---|
| 765 | resultPtr->code = 0; |
---|
| 766 | resultPtr->result = NULL; |
---|
| 767 | resultPtr->errorInfo = NULL; |
---|
| 768 | resultPtr->errorCode = NULL; |
---|
| 769 | |
---|
| 770 | /* |
---|
| 771 | * Maintain the cleanup list. |
---|
| 772 | */ |
---|
| 773 | |
---|
| 774 | resultPtr->srcThreadId = Tcl_GetCurrentThread(); |
---|
| 775 | resultPtr->dstThreadId = threadId; |
---|
| 776 | resultPtr->eventPtr = threadEventPtr; |
---|
| 777 | resultPtr->nextPtr = resultList; |
---|
| 778 | if (resultList) { |
---|
| 779 | resultList->prevPtr = resultPtr; |
---|
| 780 | } |
---|
| 781 | resultPtr->prevPtr = NULL; |
---|
| 782 | resultList = resultPtr; |
---|
| 783 | } |
---|
| 784 | |
---|
| 785 | /* |
---|
| 786 | * Queue the event and poke the other thread's notifier. |
---|
| 787 | */ |
---|
| 788 | |
---|
| 789 | threadEventPtr->event.proc = ThreadEventProc; |
---|
| 790 | Tcl_ThreadQueueEvent(threadId, (Tcl_Event *)threadEventPtr, |
---|
| 791 | TCL_QUEUE_TAIL); |
---|
| 792 | Tcl_ThreadAlert(threadId); |
---|
| 793 | |
---|
| 794 | if (!wait) { |
---|
| 795 | Tcl_MutexUnlock(&threadMutex); |
---|
| 796 | return TCL_OK; |
---|
| 797 | } |
---|
| 798 | |
---|
| 799 | /* |
---|
| 800 | * Block on the results and then get them. |
---|
| 801 | */ |
---|
| 802 | |
---|
| 803 | Tcl_ResetResult(interp); |
---|
| 804 | while (resultPtr->result == NULL) { |
---|
| 805 | Tcl_ConditionWait(&resultPtr->done, &threadMutex, NULL); |
---|
| 806 | } |
---|
| 807 | |
---|
| 808 | /* |
---|
| 809 | * Unlink result from the result list. |
---|
| 810 | */ |
---|
| 811 | |
---|
| 812 | if (resultPtr->prevPtr) { |
---|
| 813 | resultPtr->prevPtr->nextPtr = resultPtr->nextPtr; |
---|
| 814 | } else { |
---|
| 815 | resultList = resultPtr->nextPtr; |
---|
| 816 | } |
---|
| 817 | if (resultPtr->nextPtr) { |
---|
| 818 | resultPtr->nextPtr->prevPtr = resultPtr->prevPtr; |
---|
| 819 | } |
---|
| 820 | resultPtr->eventPtr = NULL; |
---|
| 821 | resultPtr->nextPtr = NULL; |
---|
| 822 | resultPtr->prevPtr = NULL; |
---|
| 823 | |
---|
| 824 | Tcl_MutexUnlock(&threadMutex); |
---|
| 825 | |
---|
| 826 | if (resultPtr->code != TCL_OK) { |
---|
| 827 | if (resultPtr->errorCode) { |
---|
| 828 | Tcl_SetErrorCode(interp, resultPtr->errorCode, NULL); |
---|
| 829 | ckfree(resultPtr->errorCode); |
---|
| 830 | } |
---|
| 831 | if (resultPtr->errorInfo) { |
---|
| 832 | Tcl_AddErrorInfo(interp, resultPtr->errorInfo); |
---|
| 833 | ckfree(resultPtr->errorInfo); |
---|
| 834 | } |
---|
| 835 | } |
---|
| 836 | Tcl_SetResult(interp, resultPtr->result, TCL_DYNAMIC); |
---|
| 837 | Tcl_ConditionFinalize(&resultPtr->done); |
---|
| 838 | code = resultPtr->code; |
---|
| 839 | |
---|
| 840 | ckfree((char *) resultPtr); |
---|
| 841 | |
---|
| 842 | return code; |
---|
| 843 | } |
---|
| 844 | |
---|
| 845 | /* |
---|
| 846 | *------------------------------------------------------------------------ |
---|
| 847 | * |
---|
| 848 | * ThreadEventProc -- |
---|
| 849 | * |
---|
| 850 | * Handle the event in the target thread. |
---|
| 851 | * |
---|
| 852 | * Results: |
---|
| 853 | * Returns 1 to indicate that the event was processed. |
---|
| 854 | * |
---|
| 855 | * Side effects: |
---|
| 856 | * Fills out the ThreadEventResult struct. |
---|
| 857 | * |
---|
| 858 | *------------------------------------------------------------------------ |
---|
| 859 | */ |
---|
| 860 | |
---|
| 861 | static int |
---|
| 862 | ThreadEventProc( |
---|
| 863 | Tcl_Event *evPtr, /* Really ThreadEvent */ |
---|
| 864 | int mask) |
---|
| 865 | { |
---|
| 866 | ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); |
---|
| 867 | ThreadEvent *threadEventPtr = (ThreadEvent *)evPtr; |
---|
| 868 | ThreadEventResult *resultPtr = threadEventPtr->resultPtr; |
---|
| 869 | Tcl_Interp *interp = tsdPtr->interp; |
---|
| 870 | int code; |
---|
| 871 | const char *result, *errorCode, *errorInfo; |
---|
| 872 | |
---|
| 873 | if (interp == NULL) { |
---|
| 874 | code = TCL_ERROR; |
---|
| 875 | result = "no target interp!"; |
---|
| 876 | errorCode = "THREAD"; |
---|
| 877 | errorInfo = ""; |
---|
| 878 | } else { |
---|
| 879 | Tcl_Preserve((ClientData) interp); |
---|
| 880 | Tcl_ResetResult(interp); |
---|
| 881 | Tcl_CreateThreadExitHandler(ThreadFreeProc, |
---|
| 882 | (ClientData) threadEventPtr->script); |
---|
| 883 | code = Tcl_GlobalEval(interp, threadEventPtr->script); |
---|
| 884 | Tcl_DeleteThreadExitHandler(ThreadFreeProc, |
---|
| 885 | (ClientData) threadEventPtr->script); |
---|
| 886 | if (code != TCL_OK) { |
---|
| 887 | errorCode = Tcl_GetVar(interp, "errorCode", TCL_GLOBAL_ONLY); |
---|
| 888 | errorInfo = Tcl_GetVar(interp, "errorInfo", TCL_GLOBAL_ONLY); |
---|
| 889 | } else { |
---|
| 890 | errorCode = errorInfo = NULL; |
---|
| 891 | } |
---|
| 892 | result = Tcl_GetStringResult(interp); |
---|
| 893 | } |
---|
| 894 | ckfree(threadEventPtr->script); |
---|
| 895 | if (resultPtr) { |
---|
| 896 | Tcl_MutexLock(&threadMutex); |
---|
| 897 | resultPtr->code = code; |
---|
| 898 | resultPtr->result = ckalloc(strlen(result) + 1); |
---|
| 899 | strcpy(resultPtr->result, result); |
---|
| 900 | if (errorCode != NULL) { |
---|
| 901 | resultPtr->errorCode = ckalloc(strlen(errorCode) + 1); |
---|
| 902 | strcpy(resultPtr->errorCode, errorCode); |
---|
| 903 | } |
---|
| 904 | if (errorInfo != NULL) { |
---|
| 905 | resultPtr->errorInfo = ckalloc(strlen(errorInfo) + 1); |
---|
| 906 | strcpy(resultPtr->errorInfo, errorInfo); |
---|
| 907 | } |
---|
| 908 | Tcl_ConditionNotify(&resultPtr->done); |
---|
| 909 | Tcl_MutexUnlock(&threadMutex); |
---|
| 910 | } |
---|
| 911 | if (interp != NULL) { |
---|
| 912 | Tcl_Release((ClientData) interp); |
---|
| 913 | } |
---|
| 914 | return 1; |
---|
| 915 | } |
---|
| 916 | |
---|
| 917 | /* |
---|
| 918 | *------------------------------------------------------------------------ |
---|
| 919 | * |
---|
| 920 | * ThreadFreeProc -- |
---|
| 921 | * |
---|
| 922 | * This is called from when we are exiting and memory needs |
---|
| 923 | * to be freed. |
---|
| 924 | * |
---|
| 925 | * Results: |
---|
| 926 | * None. |
---|
| 927 | * |
---|
| 928 | * Side effects: |
---|
| 929 | * Clears up mem specified in ClientData |
---|
| 930 | * |
---|
| 931 | *------------------------------------------------------------------------ |
---|
| 932 | */ |
---|
| 933 | |
---|
| 934 | /* ARGSUSED */ |
---|
| 935 | static void |
---|
| 936 | ThreadFreeProc( |
---|
| 937 | ClientData clientData) |
---|
| 938 | { |
---|
| 939 | if (clientData) { |
---|
| 940 | ckfree((char *) clientData); |
---|
| 941 | } |
---|
| 942 | } |
---|
| 943 | |
---|
| 944 | /* |
---|
| 945 | *------------------------------------------------------------------------ |
---|
| 946 | * |
---|
| 947 | * ThreadDeleteEvent -- |
---|
| 948 | * |
---|
| 949 | * This is called from the ThreadExitProc to delete memory related |
---|
| 950 | * to events that we put on the queue. |
---|
| 951 | * |
---|
| 952 | * Results: |
---|
| 953 | * 1 it was our event and we want it removed, 0 otherwise. |
---|
| 954 | * |
---|
| 955 | * Side effects: |
---|
| 956 | * It cleans up our events in the event queue for this thread. |
---|
| 957 | * |
---|
| 958 | *------------------------------------------------------------------------ |
---|
| 959 | */ |
---|
| 960 | |
---|
| 961 | /* ARGSUSED */ |
---|
| 962 | static int |
---|
| 963 | ThreadDeleteEvent( |
---|
| 964 | Tcl_Event *eventPtr, /* Really ThreadEvent */ |
---|
| 965 | ClientData clientData) /* dummy */ |
---|
| 966 | { |
---|
| 967 | if (eventPtr->proc == ThreadEventProc) { |
---|
| 968 | ckfree((char *) ((ThreadEvent *) eventPtr)->script); |
---|
| 969 | return 1; |
---|
| 970 | } |
---|
| 971 | |
---|
| 972 | /* |
---|
| 973 | * If it was NULL, we were in the middle of servicing the event and it |
---|
| 974 | * should be removed |
---|
| 975 | */ |
---|
| 976 | |
---|
| 977 | return (eventPtr->proc == NULL); |
---|
| 978 | } |
---|
| 979 | |
---|
| 980 | /* |
---|
| 981 | *------------------------------------------------------------------------ |
---|
| 982 | * |
---|
| 983 | * ThreadExitProc -- |
---|
| 984 | * |
---|
| 985 | * This is called when the thread exits. |
---|
| 986 | * |
---|
| 987 | * Results: |
---|
| 988 | * None. |
---|
| 989 | * |
---|
| 990 | * Side effects: |
---|
| 991 | * It unblocks anyone that is waiting on a send to this thread. It cleans |
---|
| 992 | * up any events in the event queue for this thread. |
---|
| 993 | * |
---|
| 994 | *------------------------------------------------------------------------ |
---|
| 995 | */ |
---|
| 996 | |
---|
| 997 | /* ARGSUSED */ |
---|
| 998 | static void |
---|
| 999 | ThreadExitProc( |
---|
| 1000 | ClientData clientData) |
---|
| 1001 | { |
---|
| 1002 | char *threadEvalScript = (char *) clientData; |
---|
| 1003 | ThreadEventResult *resultPtr, *nextPtr; |
---|
| 1004 | Tcl_ThreadId self = Tcl_GetCurrentThread(); |
---|
| 1005 | |
---|
| 1006 | Tcl_MutexLock(&threadMutex); |
---|
| 1007 | |
---|
| 1008 | if (threadEvalScript) { |
---|
| 1009 | ckfree((char *) threadEvalScript); |
---|
| 1010 | threadEvalScript = NULL; |
---|
| 1011 | } |
---|
| 1012 | Tcl_DeleteEvents((Tcl_EventDeleteProc *)ThreadDeleteEvent, NULL); |
---|
| 1013 | |
---|
| 1014 | for (resultPtr = resultList ; resultPtr ; resultPtr = nextPtr) { |
---|
| 1015 | nextPtr = resultPtr->nextPtr; |
---|
| 1016 | if (resultPtr->srcThreadId == self) { |
---|
| 1017 | /* |
---|
| 1018 | * We are going away. By freeing up the result we signal to the |
---|
| 1019 | * other thread we don't care about the result. |
---|
| 1020 | */ |
---|
| 1021 | |
---|
| 1022 | if (resultPtr->prevPtr) { |
---|
| 1023 | resultPtr->prevPtr->nextPtr = resultPtr->nextPtr; |
---|
| 1024 | } else { |
---|
| 1025 | resultList = resultPtr->nextPtr; |
---|
| 1026 | } |
---|
| 1027 | if (resultPtr->nextPtr) { |
---|
| 1028 | resultPtr->nextPtr->prevPtr = resultPtr->prevPtr; |
---|
| 1029 | } |
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| 1030 | resultPtr->nextPtr = resultPtr->prevPtr = 0; |
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| 1031 | resultPtr->eventPtr->resultPtr = NULL; |
---|
| 1032 | ckfree((char *) resultPtr); |
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| 1033 | } else if (resultPtr->dstThreadId == self) { |
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| 1034 | /* |
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| 1035 | * Dang. The target is going away. Unblock the caller. The result |
---|
| 1036 | * string must be dynamically allocated because the main thread is |
---|
| 1037 | * going to call free on it. |
---|
| 1038 | */ |
---|
| 1039 | |
---|
| 1040 | char *msg = "target thread died"; |
---|
| 1041 | |
---|
| 1042 | resultPtr->result = ckalloc(strlen(msg)+1); |
---|
| 1043 | strcpy(resultPtr->result, msg); |
---|
| 1044 | resultPtr->code = TCL_ERROR; |
---|
| 1045 | Tcl_ConditionNotify(&resultPtr->done); |
---|
| 1046 | } |
---|
| 1047 | } |
---|
| 1048 | Tcl_MutexUnlock(&threadMutex); |
---|
| 1049 | } |
---|
| 1050 | #endif /* TCL_THREADS */ |
---|
| 1051 | |
---|
| 1052 | /* |
---|
| 1053 | * Local Variables: |
---|
| 1054 | * mode: c |
---|
| 1055 | * c-basic-offset: 4 |
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| 1056 | * fill-column: 78 |
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| 1057 | * End: |
---|
| 1058 | */ |
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