[1963] | 1 | /* |
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| 2 | Bullet Continuous Collision Detection and Physics Library |
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| 3 | Copyright (c) 2003-2007 Erwin Coumans http://bulletphysics.com |
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| 4 | |
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| 5 | This software is provided 'as-is', without any express or implied warranty. |
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| 6 | In no event will the authors be held liable for any damages arising from the use of this software. |
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| 7 | Permission is granted to anyone to use this software for any purpose, |
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| 8 | including commercial applications, and to alter it and redistribute it freely, |
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| 9 | subject to the following restrictions: |
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| 10 | |
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| 11 | 1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required. |
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| 12 | 2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software. |
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| 13 | 3. This notice may not be removed or altered from any source distribution. |
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| 14 | */ |
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| 15 | |
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| 16 | #include <stdio.h> |
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| 17 | #include "PosixThreadSupport.h" |
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| 18 | |
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| 19 | |
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| 20 | #ifdef USE_PTHREADS |
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| 21 | |
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| 22 | #include "SpuCollisionTaskProcess.h" |
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| 23 | #include "SpuNarrowPhaseCollisionTask/SpuGatheringCollisionTask.h" |
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| 24 | |
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| 25 | #define checkPThreadFunction(returnValue) \ |
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| 26 | if(0 != returnValue) { \ |
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| 27 | printf("PThread problem at line %i in file %s: %i\n", __LINE__, __FILE__, returnValue); \ |
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| 28 | } |
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| 29 | |
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| 30 | // The number of threads should be equal to the number of available cores |
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| 31 | // Todo: each worker should be linked to a single core, using SetThreadIdealProcessor. |
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| 32 | |
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| 33 | // PosixThreadSupport helps to initialize/shutdown libspe2, start/stop SPU tasks and communication |
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| 34 | // Setup and initialize SPU/CELL/Libspe2 |
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| 35 | PosixThreadSupport::PosixThreadSupport(ThreadConstructionInfo& threadConstructionInfo) |
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| 36 | { |
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| 37 | startThreads(threadConstructionInfo); |
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| 38 | } |
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| 39 | |
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| 40 | // cleanup/shutdown Libspe2 |
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| 41 | PosixThreadSupport::~PosixThreadSupport() |
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| 42 | { |
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| 43 | stopSPU(); |
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| 44 | } |
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| 45 | |
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| 46 | // this semaphore will signal, if and how many threads are finished with their work |
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| 47 | static sem_t mainSemaphore; |
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| 48 | |
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| 49 | static void *threadFunction(void *argument) |
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| 50 | { |
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| 51 | |
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| 52 | PosixThreadSupport::btSpuStatus* status = (PosixThreadSupport::btSpuStatus*)argument; |
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| 53 | |
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| 54 | |
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| 55 | while (1) |
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| 56 | { |
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| 57 | checkPThreadFunction(sem_wait(&status->startSemaphore)); |
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| 58 | |
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| 59 | void* userPtr = status->m_userPtr; |
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| 60 | |
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| 61 | if (userPtr) |
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| 62 | { |
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| 63 | btAssert(status->m_status); |
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| 64 | status->m_userThreadFunc(userPtr,status->m_lsMemory); |
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| 65 | status->m_status = 2; |
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| 66 | checkPThreadFunction(sem_post(&mainSemaphore)); |
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| 67 | |
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| 68 | status->threadUsed++; |
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| 69 | } else { |
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| 70 | //exit Thread |
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| 71 | status->m_status = 3; |
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| 72 | checkPThreadFunction(sem_post(&mainSemaphore)); |
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| 73 | printf("Thread with taskId %i exiting\n",status->m_taskId); |
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| 74 | break; |
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| 75 | } |
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| 76 | |
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| 77 | } |
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| 78 | |
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| 79 | printf("Thread TERMINATED\n"); |
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| 80 | return 0; |
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| 81 | |
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| 82 | } |
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| 83 | |
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| 84 | ///send messages to SPUs |
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| 85 | void PosixThreadSupport::sendRequest(uint32_t uiCommand, uint32_t uiArgument0, uint32_t taskId) |
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| 86 | { |
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| 87 | /// gMidphaseSPU.sendRequest(CMD_GATHER_AND_PROCESS_PAIRLIST, (uint32_t) &taskDesc); |
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| 88 | |
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| 89 | ///we should spawn an SPU task here, and in 'waitForResponse' it should wait for response of the (one of) the first tasks that finished |
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| 90 | |
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| 91 | |
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| 92 | |
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| 93 | switch (uiCommand) |
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| 94 | { |
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| 95 | case CMD_GATHER_AND_PROCESS_PAIRLIST: |
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| 96 | { |
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| 97 | btSpuStatus& spuStatus = m_activeSpuStatus[taskId]; |
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| 98 | btAssert(taskId >= 0); |
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| 99 | btAssert(taskId < m_activeSpuStatus.size()); |
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| 100 | |
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| 101 | spuStatus.m_commandId = uiCommand; |
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| 102 | spuStatus.m_status = 1; |
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| 103 | spuStatus.m_userPtr = (void*)uiArgument0; |
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| 104 | |
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| 105 | // fire event to start new task |
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| 106 | checkPThreadFunction(sem_post(&spuStatus.startSemaphore)); |
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| 107 | break; |
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| 108 | } |
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| 109 | default: |
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| 110 | { |
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| 111 | ///not implemented |
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| 112 | btAssert(0); |
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| 113 | } |
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| 114 | |
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| 115 | }; |
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| 116 | |
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| 117 | |
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| 118 | } |
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| 119 | |
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| 120 | |
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| 121 | ///check for messages from SPUs |
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| 122 | void PosixThreadSupport::waitForResponse(unsigned int *puiArgument0, unsigned int *puiArgument1) |
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| 123 | { |
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| 124 | ///We should wait for (one of) the first tasks to finish (or other SPU messages), and report its response |
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| 125 | |
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| 126 | ///A possible response can be 'yes, SPU handled it', or 'no, please do a PPU fallback' |
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| 127 | |
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| 128 | |
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| 129 | btAssert(m_activeSpuStatus.size()); |
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| 130 | |
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| 131 | // wait for any of the threads to finish |
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| 132 | checkPThreadFunction(sem_wait(&mainSemaphore)); |
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| 133 | |
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| 134 | // get at least one thread which has finished |
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| 135 | size_t last = -1; |
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| 136 | |
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| 137 | for(size_t t=0; t < m_activeSpuStatus.size(); ++t) { |
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| 138 | if(2 == m_activeSpuStatus[t].m_status) { |
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| 139 | last = t; |
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| 140 | break; |
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| 141 | } |
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| 142 | } |
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| 143 | |
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| 144 | btSpuStatus& spuStatus = m_activeSpuStatus[last]; |
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| 145 | |
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| 146 | btAssert(spuStatus.m_status > 1); |
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| 147 | spuStatus.m_status = 0; |
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| 148 | |
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| 149 | // need to find an active spu |
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| 150 | btAssert(last >= 0); |
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| 151 | |
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| 152 | *puiArgument0 = spuStatus.m_taskId; |
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| 153 | *puiArgument1 = spuStatus.m_status; |
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| 154 | } |
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| 155 | |
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| 156 | |
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| 157 | |
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| 158 | void PosixThreadSupport::startThreads(ThreadConstructionInfo& threadConstructionInfo) |
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| 159 | { |
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| 160 | printf("%s creating %i threads.\n", __FUNCTION__, threadConstructionInfo.m_numThreads); |
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| 161 | m_activeSpuStatus.resize(threadConstructionInfo.m_numThreads); |
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| 162 | |
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| 163 | checkPThreadFunction(sem_init(&mainSemaphore, 0, 0)); |
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| 164 | |
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| 165 | for (int i=0;i < threadConstructionInfo.m_numThreads;i++) |
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| 166 | { |
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| 167 | printf("starting thread %d\n",i); |
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| 168 | |
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| 169 | btSpuStatus& spuStatus = m_activeSpuStatus[i]; |
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| 170 | |
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| 171 | checkPThreadFunction(sem_init(&spuStatus.startSemaphore, 0, 0)); |
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| 172 | checkPThreadFunction(pthread_create(&spuStatus.thread, NULL, &threadFunction, (void*)&spuStatus)); |
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| 173 | |
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| 174 | spuStatus.m_userPtr=0; |
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| 175 | |
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| 176 | spuStatus.m_taskId = i; |
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| 177 | spuStatus.m_commandId = 0; |
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| 178 | spuStatus.m_status = 0; |
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| 179 | spuStatus.m_lsMemory = threadConstructionInfo.m_lsMemoryFunc(); |
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| 180 | spuStatus.m_userThreadFunc = threadConstructionInfo.m_userThreadFunc; |
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| 181 | spuStatus.threadUsed = 0; |
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| 182 | |
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| 183 | printf("started thread %d \n",i); |
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| 184 | |
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| 185 | } |
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| 186 | |
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| 187 | } |
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| 188 | |
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| 189 | void PosixThreadSupport::startSPU() |
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| 190 | { |
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| 191 | } |
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| 192 | |
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| 193 | |
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| 194 | ///tell the task scheduler we are done with the SPU tasks |
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| 195 | void PosixThreadSupport::stopSPU() |
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| 196 | { |
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| 197 | for(size_t t=0; t < m_activeSpuStatus.size(); ++t) { |
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| 198 | btSpuStatus& spuStatus = m_activeSpuStatus[t]; |
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| 199 | printf("%s: Thread %i used: %ld\n", __FUNCTION__, t, spuStatus.threadUsed); |
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| 200 | |
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| 201 | |
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| 202 | checkPThreadFunction(sem_destroy(&spuStatus.startSemaphore)); |
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| 203 | checkPThreadFunction(pthread_cancel(spuStatus.thread)); |
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| 204 | } |
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| 205 | checkPThreadFunction(sem_destroy(&mainSemaphore)); |
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| 206 | |
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| 207 | m_activeSpuStatus.clear(); |
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| 208 | } |
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| 209 | |
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| 210 | #endif // USE_PTHREADS |
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| 211 | |
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