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/*************************************************************************** |
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* * |
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* LinuxSampler - modular, streaming capable sampler * |
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* * |
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* Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck * |
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* * |
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* This program is free software; you can redistribute it and/or modify * |
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* it under the terms of the GNU General Public License as published by * |
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* the Free Software Foundation; either version 2 of the License, or * |
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* (at your option) any later version. * |
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* * |
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* This program is distributed in the hope that it will be useful, * |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of * |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * |
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* GNU General Public License for more details. * |
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* * |
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* You should have received a copy of the GNU General Public License * |
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* along with this program; if not, write to the Free Software * |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, * |
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* MA 02111-1307 USA * |
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***************************************************************************/ |
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#include "Thread.h" |
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Thread::Thread(bool LockMemory, bool RealTime, int PriorityMax, int PriorityDelta) { |
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this->bLockedMemory = LockMemory; |
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this->isRealTime = RealTime; |
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this->Running = false; |
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this->PriorityDelta = PriorityDelta; |
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this->PriorityMax = PriorityMax; |
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__thread_destructor_key = 0; |
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pthread_mutex_init(&__thread_state_mutex, NULL); |
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pthread_cond_init(&__thread_start_condition, NULL); |
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pthread_cond_init(&__thread_exit_condition, NULL); |
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} |
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Thread::~Thread() { |
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StopThread(); |
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pthread_cond_destroy(&__thread_start_condition); |
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pthread_cond_destroy(&__thread_exit_condition); |
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pthread_mutex_destroy(&__thread_state_mutex); |
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} |
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/** |
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* Starts the thread. This method will wait until the thread actually |
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* started it's execution before it will return. The abstract method |
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* Main() is the entry point for the new thread. You have to implement the |
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* Main() method in your subclass. |
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*/ |
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int Thread::StartThread() { |
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pthread_mutex_lock(&__thread_state_mutex); |
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if (!Running) { |
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SignalStartThread(); |
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pthread_cond_wait(&__thread_start_condition, &__thread_state_mutex); |
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} |
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pthread_mutex_unlock(&__thread_state_mutex); |
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return 0; |
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} |
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/** |
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* Starts the thread. This method will signal to start the thread and |
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* return immediately. Note that the thread might not yet run when this |
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* method returns! The abstract method Main() is the entry point for the |
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* new thread. You have to implement the Main() method in your subclass. |
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* |
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* @see StartThread() |
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*/ |
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int Thread::SignalStartThread() { |
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// Create and run the thread |
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int res = pthread_create(&this->__thread_id, NULL, __pthread_launcher, this); |
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switch (res) { |
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case 0: // Success |
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break; |
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case EAGAIN: |
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std::cerr << "Thread creation failed: System doesn't allow to create another thread." |
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<< std::endl << std::flush; |
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this->Running = false; |
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break; |
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case EPERM: |
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std::cerr << "Thread creation failed: You're lacking permisssions to set required scheduling policy and parameters." |
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<< std::endl << std::flush; |
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this->Running = false; |
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break; |
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default: |
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std::cerr << "Thread creation failed: Unknown cause." |
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<< std::endl << std::flush; |
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this->Running = false; |
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break; |
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} |
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return res; |
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} |
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/** |
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* Stops the thread. This method will wait until the thread actually stopped |
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* it's execution before it will return. |
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*/ |
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int Thread::StopThread() { |
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pthread_mutex_lock(&__thread_state_mutex); |
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if (Running) { |
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SignalStopThread(); |
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pthread_cond_wait(&__thread_exit_condition, &__thread_state_mutex); |
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pthread_detach(__thread_id); |
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} |
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pthread_mutex_unlock(&__thread_state_mutex); |
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return 0; |
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} |
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/** |
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* Stops the thread. This method will signal to stop the thread and return |
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* immediately. Note that the thread might still run when this method |
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* returns! |
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* |
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* @see StopThread() |
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*/ |
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int Thread::SignalStopThread() { |
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pthread_cancel(__thread_id); |
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return 0; |
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} |
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/** |
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* Sets the process SCHED_FIFO policy, if max=1 then set at max priority, |
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* else use min priority. delta is added to the priority so that we can |
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* for example set 3 SCHED_FIFO tasks to different priorities by specifying |
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* delta 0 , -1 , -2 ( 0 = highest priority because -1 is subtracted to the |
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* current priority). |
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*/ |
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int Thread::SetSchedulingPriority() { |
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#if !defined(__APPLE__) |
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struct sched_param schp; |
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if (!isRealTime) return 0; |
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/* |
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* set the process to realtime privs |
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*/ |
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memset(&schp, 0, sizeof(schp)); |
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if (this->PriorityMax == 1) { |
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schp.sched_priority = sched_get_priority_max(SCHED_FIFO) + this->PriorityDelta; |
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} |
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if (this->PriorityMax == -1) { |
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schp.sched_priority = sched_get_priority_min(SCHED_FIFO) + this->PriorityDelta; |
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} |
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if (sched_setscheduler(0, SCHED_FIFO, &schp) != 0) { |
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perror("Thread: WARNING, can't assign realtime scheduling to thread!"); |
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return -1; |
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} |
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#endif |
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return 0; |
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} |
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/** |
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* Locks the memory so it will not be swapped out by the operating system. |
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*/ |
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int Thread::LockMemory() { |
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#if !defined(__APPLE__) |
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if (!bLockedMemory) return 0; |
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if (mlockall(MCL_CURRENT | MCL_FUTURE) < 0) { |
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perror("Thread: WARNING, can't mlockall() memory!"); |
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return -1; |
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} |
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#endif |
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return 0; |
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} |
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/** |
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* Registers thread destructor callback function which will be executed when |
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* the thread stops it's execution and sets the 'Running' flag to true. This |
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* method will be called by the __pthread_launcher callback function, DO NOT |
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* CALL THIS METHOD YOURSELF! |
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*/ |
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void Thread::EnableDestructor() { |
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pthread_mutex_lock(&__thread_state_mutex); |
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pthread_key_create(&__thread_destructor_key, __pthread_destructor); |
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pthread_setspecific(__thread_destructor_key, this); |
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Running = true; |
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pthread_mutex_unlock(&__thread_state_mutex); |
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pthread_cond_broadcast(&__thread_start_condition); |
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} |
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/** |
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* Will be called by the kernel when the thread stops it's execution. |
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*/ |
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int Thread::Destructor() { |
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pthread_key_delete(__thread_destructor_key); |
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pthread_mutex_lock(&__thread_state_mutex); |
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Running = false; |
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pthread_mutex_unlock(&__thread_state_mutex); |
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pthread_cond_broadcast(&__thread_exit_condition); |
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return 0; |
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} |
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/// Callback function for the POSIX thread API |
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void* __pthread_launcher(void* thread) { |
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pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, NULL); // let the thread be killable under any circumstances |
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Thread* t; |
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t = (Thread*) thread; |
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t->SetSchedulingPriority(); |
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t->LockMemory(); |
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t->EnableDestructor(); |
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t->Main(); |
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return NULL; |
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} |
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/// Callback function for the POSIX thread API |
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void __pthread_destructor(void* thread) { |
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Thread* t; |
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t = (Thread*) thread; |
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t->Destructor(); |
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} |