void TaskSchedulerTBB::thread_loop(size_t threadIndex)
{
/* allocate thread structure */
Thread thread(threadIndex,this);
threadLocal[threadIndex] = &thread;
Thread* oldThread = swapThread(&thread);
/* main thread loop */
while (anyTasksRunning > 0)
{
steal_loop(thread,
[&] () { return anyTasksRunning > 0; },
[&] () {
atomic_add(&anyTasksRunning,+1);
while (thread.tasks.execute_local(thread,nullptr));
atomic_add(&anyTasksRunning,-1);
});
}
threadLocal[threadIndex] = nullptr;
swapThread(oldThread);
/* wait for all threads to terminate */
atomic_add(&threadCounter,-1);
while (threadCounter > 0)
yield();
}
std::exception_ptr TaskSchedulerTBB::thread_loop(size_t threadIndex)
{
/* allocate thread structure */
std::unique_ptr<Thread> mthread(new Thread(threadIndex,this)); // too large for stack allocation
Thread& thread = *mthread;
threadLocal[threadIndex] = &thread;
Thread* oldThread = swapThread(&thread);
/* main thread loop */
while (anyTasksRunning)
{
steal_loop(thread,
[&] () { return anyTasksRunning > 0; },
[&] () {
atomic_add(&anyTasksRunning,+1);
while (thread.tasks.execute_local(thread,nullptr));
atomic_add(&anyTasksRunning,-1);
});
}
threadLocal[threadIndex] = nullptr;
swapThread(oldThread);
/* remember exception to throw */
std::exception_ptr except = nullptr;
if (cancellingException != nullptr) except = cancellingException;
/* wait for all threads to terminate */
atomic_add(&threadCounter,-1);
while (threadCounter > 0) yield();
return except;
}
std::exception_ptr TaskScheduler::thread_loop(size_t threadIndex)
{
/* allocate thread structure */
std::unique_ptr<Thread> mthread(new Thread(threadIndex,this)); // too large for stack allocation
Thread& thread = *mthread;
threadLocal[threadIndex].store(&thread);
Thread* oldThread = swapThread(&thread);
/* main thread loop */
while (anyTasksRunning)
{
steal_loop(thread,
[&] () { return anyTasksRunning > 0; },
[&] () {
anyTasksRunning++;
while (thread.tasks.execute_local_internal(thread,nullptr));
anyTasksRunning--;
});
}
threadLocal[threadIndex].store(nullptr);
swapThread(oldThread);
/* remember exception to throw */
std::exception_ptr except = nullptr;
if (cancellingException != nullptr) except = cancellingException;
/* wait for all threads to terminate */
threadCounter--;
#if defined(__WIN32__)
size_t loopIndex = 1;
#endif
#define LOOP_YIELD_THRESHOLD (4096)
while (threadCounter > 0) {
#if defined(__WIN32__)
if ((loopIndex % LOOP_YIELD_THRESHOLD) == 0)
yield();
else
_mm_pause();
loopIndex++;
#else
yield();
#endif
}
return except;
}
