Thread Threads[THREAD_MAX];
Lock MPLock;
Lock IOLock;
- bool AllThreadsShouldExit = false;
+ bool AllThreadsShouldExit, AllThreadsShouldSleep;
SplitPoint SplitPointStack[THREAD_MAX][ACTIVE_SPLIT_POINTS_MAX];
- bool Idle = true;
#if !defined(_MSC_VER)
pthread_cond_t WaitCond;
int maxNodes, int maxTime, Move searchMoves[]) {
// Initialize global search variables
- Idle = StopOnPonderhit = AbortSearch = Quit = false;
+ AllThreadsShouldSleep = StopOnPonderhit = AbortSearch = Quit = false;
AspirationFailLow = false;
NodesSincePoll = 0;
SearchStartTime = get_system_time();
if (UseLogFile)
LogFile.close();
- Idle = true;
+ AllThreadsShouldSleep = true;
return !Quit;
}
pthread_t pthread[1];
#endif
- for (i = 0; i < THREAD_MAX; i++)
- Threads[i].activeSplitPoints = 0;
-
// Initialize global locks
lock_init(&MPLock, NULL);
lock_init(&IOLock, NULL);
SitIdleEvent[i] = CreateEvent(0, FALSE, FALSE, 0);
#endif
+ // Will be set just before program exits to properly end the threads
+ AllThreadsShouldExit = false;
+
+ // Threads will be put to sleep as soon as created
+ AllThreadsShouldSleep = true;
+
// All threads except the main thread should be initialized to idle state
for (i = 1; i < THREAD_MAX; i++)
- {
- Threads[i].stop = false;
- Threads[i].workIsWaiting = false;
Threads[i].idle = true;
- Threads[i].running = false;
- }
// Launch the helper threads
for (i = 1; i < THREAD_MAX; i++)
void stop_threads() {
ActiveThreads = THREAD_MAX; // HACK
- Idle = false; // HACK
+ AllThreadsShouldSleep = false; // HACK
wake_sleeping_threads();
AllThreadsShouldExit = true;
for (int i = 1; i < THREAD_MAX; i++)
Threads[threadID].running = true;
- while (true)
+ while (!AllThreadsShouldExit || threadID == 0)
{
- if (AllThreadsShouldExit && threadID != 0)
- break;
-
// If we are not thinking, wait for a condition to be signaled
// instead of wasting CPU time polling for work.
- while (threadID != 0 && (Idle || threadID >= ActiveThreads))
+ while ( threadID != 0
+ && !AllThreadsShouldExit
+ && (AllThreadsShouldSleep || threadID >= ActiveThreads))
{
+ Threads[threadID].sleeping = true;
+
#if !defined(_MSC_VER)
pthread_mutex_lock(&WaitLock);
if (Idle || threadID >= ActiveThreads)
#endif
}
+ // Out of the while loop to avoid races in case thread is woken up but
+ // while condition still holds true so that is put to sleep again.
+ Threads[threadID].sleeping = false;
+
// If this thread has been assigned work, launch a search
if (Threads[threadID].workIsWaiting)
{
{
for (int i = 1; i < ActiveThreads; i++)
{
+ assert(Threads[i].sleeping == true);
+
Threads[i].idle = true;
Threads[i].workIsWaiting = false;
}
for (int i = 1; i < THREAD_MAX; i++)
SetEvent(SitIdleEvent[i]);
#endif
+
+ // Wait for the threads to be all woken up
+ for (int i = 1; i < ActiveThreads; i++)
+ while (Threads[i].sleeping);
}
}