Merge pull request #1869 from cpeterso/master
rt: lock_and_signal fixes
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commit
657ef8ef60
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@ -19,7 +19,18 @@ lock_and_signal::lock_and_signal()
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: _holding_thread(INVALID_THREAD)
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{
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_event = CreateEvent(NULL, FALSE, FALSE, NULL);
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InitializeCriticalSection(&_cs);
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// If a CRITICAL_SECTION is not initialized with a spin count, it will
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// default to 0, even on multi-processor systems. MSDN suggests using
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// 4000. On single-processor systems, the spin count parameter is ignored
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// and the critical section's spin count defaults to 0.
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const DWORD SPIN_COUNT = 4000;
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CHECKED(!InitializeCriticalSectionAndSpinCount(&_cs, SPIN_COUNT));
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// TODO? Consider checking GetProcAddress("InitializeCriticalSectionEx")
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// so Windows >= Vista we can use CRITICAL_SECTION_NO_DEBUG_INFO to avoid
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// allocating CRITICAL_SECTION debug info that is never released. See:
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// http://stackoverflow.com/questions/804848/critical-sections-leaking-memory-on-vista-win2008#889853
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}
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#else
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@ -32,8 +43,10 @@ lock_and_signal::lock_and_signal()
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#endif
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lock_and_signal::~lock_and_signal() {
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assert(_holding_thread == INVALID_THREAD);
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#if defined(__WIN32__)
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CloseHandle(_event);
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DeleteCriticalSection(&_cs);
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#else
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CHECKED(pthread_cond_destroy(&_cond));
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CHECKED(pthread_mutex_destroy(&_mutex));
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@ -41,6 +54,7 @@ lock_and_signal::~lock_and_signal() {
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}
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void lock_and_signal::lock() {
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assert(!lock_held_by_current_thread());
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#if defined(__WIN32__)
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EnterCriticalSection(&_cs);
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_holding_thread = GetCurrentThreadId();
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@ -51,6 +65,7 @@ void lock_and_signal::lock() {
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}
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void lock_and_signal::unlock() {
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assert(lock_held_by_current_thread());
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_holding_thread = INVALID_THREAD;
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#if defined(__WIN32__)
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LeaveCriticalSection(&_cs);
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@ -69,9 +84,11 @@ void lock_and_signal::wait() {
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LeaveCriticalSection(&_cs);
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WaitForSingleObject(_event, INFINITE);
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EnterCriticalSection(&_cs);
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assert(_holding_thread == INVALID_THREAD);
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_holding_thread = GetCurrentThreadId();
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#else
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CHECKED(pthread_cond_wait(&_cond, &_mutex));
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assert(_holding_thread == INVALID_THREAD);
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_holding_thread = pthread_self();
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#endif
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}
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