diff --git a/include/uv-win.h b/include/uv-win.h index 750761c0..5e74c520 100644 --- a/include/uv-win.h +++ b/include/uv-win.h @@ -244,7 +244,7 @@ typedef union { CRITICAL_SECTION waiters_count_lock; HANDLE signal_event; HANDLE broadcast_event; - } fallback; + } unused_; /* TODO: retained for ABI compatibility; remove me in v2.x. */ } uv_cond_t; typedef union { diff --git a/src/win/thread.c b/src/win/thread.c index f0c62eb7..3342fd75 100644 --- a/src/win/thread.c +++ b/src/win/thread.c @@ -26,17 +26,6 @@ #include "uv.h" #include "internal.h" - -#define HAVE_CONDVAR_API() (pInitializeConditionVariable != NULL) - -static int uv_cond_fallback_init(uv_cond_t* cond); -static void uv_cond_fallback_destroy(uv_cond_t* cond); -static void uv_cond_fallback_signal(uv_cond_t* cond); -static void uv_cond_fallback_broadcast(uv_cond_t* cond); -static void uv_cond_fallback_wait(uv_cond_t* cond, uv_mutex_t* mutex); -static int uv_cond_fallback_timedwait(uv_cond_t* cond, - uv_mutex_t* mutex, uint64_t timeout); - static int uv_cond_condvar_init(uv_cond_t* cond); static void uv_cond_condvar_destroy(uv_cond_t* cond); static void uv_cond_condvar_signal(uv_cond_t* cond); @@ -377,220 +366,35 @@ int uv_sem_trywait(uv_sem_t* sem) { } -/* This condition variable implementation is based on the SetEvent solution - * (section 3.2) at http://www.cs.wustl.edu/~schmidt/win32-cv-1.html - * We could not use the SignalObjectAndWait solution (section 3.4) because - * it want the 2nd argument (type uv_mutex_t) of uv_cond_wait() and - * uv_cond_timedwait() to be HANDLEs, but we use CRITICAL_SECTIONs. - */ - -static int uv_cond_fallback_init(uv_cond_t* cond) { - int err; - - /* Initialize the count to 0. */ - cond->fallback.waiters_count = 0; - - InitializeCriticalSection(&cond->fallback.waiters_count_lock); - - /* Create an auto-reset event. */ - cond->fallback.signal_event = CreateEvent(NULL, /* no security */ - FALSE, /* auto-reset event */ - FALSE, /* non-signaled initially */ - NULL); /* unnamed */ - if (!cond->fallback.signal_event) { - err = GetLastError(); - goto error2; - } - - /* Create a manual-reset event. */ - cond->fallback.broadcast_event = CreateEvent(NULL, /* no security */ - TRUE, /* manual-reset */ - FALSE, /* non-signaled */ - NULL); /* unnamed */ - if (!cond->fallback.broadcast_event) { - err = GetLastError(); - goto error; - } - - return 0; - -error: - CloseHandle(cond->fallback.signal_event); -error2: - DeleteCriticalSection(&cond->fallback.waiters_count_lock); - return uv_translate_sys_error(err); -} - - -static int uv_cond_condvar_init(uv_cond_t* cond) { - pInitializeConditionVariable(&cond->cond_var); - return 0; -} - - int uv_cond_init(uv_cond_t* cond) { - uv__once_init(); - - if (HAVE_CONDVAR_API()) - return uv_cond_condvar_init(cond); - else - return uv_cond_fallback_init(cond); -} - - -static void uv_cond_fallback_destroy(uv_cond_t* cond) { - if (!CloseHandle(cond->fallback.broadcast_event)) - abort(); - if (!CloseHandle(cond->fallback.signal_event)) - abort(); - DeleteCriticalSection(&cond->fallback.waiters_count_lock); -} - - -static void uv_cond_condvar_destroy(uv_cond_t* cond) { - /* nothing to do */ + InitializeConditionVariable(&cond->cond_var); + return 0; } void uv_cond_destroy(uv_cond_t* cond) { - if (HAVE_CONDVAR_API()) - uv_cond_condvar_destroy(cond); - else - uv_cond_fallback_destroy(cond); -} - - -static void uv_cond_fallback_signal(uv_cond_t* cond) { - int have_waiters; - - /* Avoid race conditions. */ - EnterCriticalSection(&cond->fallback.waiters_count_lock); - have_waiters = cond->fallback.waiters_count > 0; - LeaveCriticalSection(&cond->fallback.waiters_count_lock); - - if (have_waiters) - SetEvent(cond->fallback.signal_event); -} - - -static void uv_cond_condvar_signal(uv_cond_t* cond) { - pWakeConditionVariable(&cond->cond_var); + /* nothing to do */ + UV__UNUSED(cond); } void uv_cond_signal(uv_cond_t* cond) { - if (HAVE_CONDVAR_API()) - uv_cond_condvar_signal(cond); - else - uv_cond_fallback_signal(cond); -} - - -static void uv_cond_fallback_broadcast(uv_cond_t* cond) { - int have_waiters; - - /* Avoid race conditions. */ - EnterCriticalSection(&cond->fallback.waiters_count_lock); - have_waiters = cond->fallback.waiters_count > 0; - LeaveCriticalSection(&cond->fallback.waiters_count_lock); - - if (have_waiters) - SetEvent(cond->fallback.broadcast_event); -} - - -static void uv_cond_condvar_broadcast(uv_cond_t* cond) { - pWakeAllConditionVariable(&cond->cond_var); + WakeConditionVariable(&cond->cond_var); } void uv_cond_broadcast(uv_cond_t* cond) { - if (HAVE_CONDVAR_API()) - uv_cond_condvar_broadcast(cond); - else - uv_cond_fallback_broadcast(cond); -} - - -static int uv_cond_wait_helper(uv_cond_t* cond, uv_mutex_t* mutex, - DWORD dwMilliseconds) { - DWORD result; - int last_waiter; - HANDLE handles[2] = { - cond->fallback.signal_event, - cond->fallback.broadcast_event - }; - - /* Avoid race conditions. */ - EnterCriticalSection(&cond->fallback.waiters_count_lock); - cond->fallback.waiters_count++; - LeaveCriticalSection(&cond->fallback.waiters_count_lock); - - /* It's ok to release the here since Win32 manual-reset events - * maintain state when used with . This avoids the "lost wakeup" - * bug. */ - uv_mutex_unlock(mutex); - - /* Wait for either event to become signaled due to being - * called or being called. */ - result = WaitForMultipleObjects(2, handles, FALSE, dwMilliseconds); - - EnterCriticalSection(&cond->fallback.waiters_count_lock); - cond->fallback.waiters_count--; - last_waiter = result == WAIT_OBJECT_0 + 1 - && cond->fallback.waiters_count == 0; - LeaveCriticalSection(&cond->fallback.waiters_count_lock); - - /* Some thread called . */ - if (last_waiter) { - /* We're the last waiter to be notified or to stop waiting, so reset the - * the manual-reset event. */ - ResetEvent(cond->fallback.broadcast_event); - } - - /* Reacquire the . */ - uv_mutex_lock(mutex); - - if (result == WAIT_OBJECT_0 || result == WAIT_OBJECT_0 + 1) - return 0; - - if (result == WAIT_TIMEOUT) - return UV_ETIMEDOUT; - - abort(); - return -1; /* Satisfy the compiler. */ -} - - -static void uv_cond_fallback_wait(uv_cond_t* cond, uv_mutex_t* mutex) { - if (uv_cond_wait_helper(cond, mutex, INFINITE)) - abort(); -} - - -static void uv_cond_condvar_wait(uv_cond_t* cond, uv_mutex_t* mutex) { - if (!pSleepConditionVariableCS(&cond->cond_var, mutex, INFINITE)) - abort(); + WakeAllConditionVariable(&cond->cond_var); } void uv_cond_wait(uv_cond_t* cond, uv_mutex_t* mutex) { - if (HAVE_CONDVAR_API()) - uv_cond_condvar_wait(cond, mutex); - else - uv_cond_fallback_wait(cond, mutex); + if (!SleepConditionVariableCS(&cond->cond_var, mutex, INFINITE)) + abort(); } - -static int uv_cond_fallback_timedwait(uv_cond_t* cond, - uv_mutex_t* mutex, uint64_t timeout) { - return uv_cond_wait_helper(cond, mutex, (DWORD)(timeout / 1e6)); -} - - -static int uv_cond_condvar_timedwait(uv_cond_t* cond, - uv_mutex_t* mutex, uint64_t timeout) { - if (pSleepConditionVariableCS(&cond->cond_var, mutex, (DWORD)(timeout / 1e6))) +int uv_cond_timedwait(uv_cond_t* cond, uv_mutex_t* mutex, uint64_t timeout) { + if (SleepConditionVariableCS(&cond->cond_var, mutex, (DWORD)(timeout / 1e6))) return 0; if (GetLastError() != ERROR_TIMEOUT) abort(); @@ -598,15 +402,6 @@ static int uv_cond_condvar_timedwait(uv_cond_t* cond, } -int uv_cond_timedwait(uv_cond_t* cond, uv_mutex_t* mutex, - uint64_t timeout) { - if (HAVE_CONDVAR_API()) - return uv_cond_condvar_timedwait(cond, mutex, timeout); - else - return uv_cond_fallback_timedwait(cond, mutex, timeout); -} - - int uv_barrier_init(uv_barrier_t* barrier, unsigned int count) { int err; diff --git a/src/win/winapi.c b/src/win/winapi.c index f12f207f..8a4f7b12 100644 --- a/src/win/winapi.c +++ b/src/win/winapi.c @@ -39,11 +39,6 @@ sNtQuerySystemInformation pNtQuerySystemInformation; sGetQueuedCompletionStatusEx pGetQueuedCompletionStatusEx; sSetFileCompletionNotificationModes pSetFileCompletionNotificationModes; sCreateSymbolicLinkW pCreateSymbolicLinkW; -sInitializeConditionVariable pInitializeConditionVariable; -sSleepConditionVariableCS pSleepConditionVariableCS; -sSleepConditionVariableSRW pSleepConditionVariableSRW; -sWakeAllConditionVariable pWakeAllConditionVariable; -sWakeConditionVariable pWakeConditionVariable; sGetFinalPathNameByHandleW pGetFinalPathNameByHandleW; @@ -127,20 +122,6 @@ void uv_winapi_init(void) { pCreateSymbolicLinkW = (sCreateSymbolicLinkW) GetProcAddress(kernel32_module, "CreateSymbolicLinkW"); - pInitializeConditionVariable = (sInitializeConditionVariable) - GetProcAddress(kernel32_module, "InitializeConditionVariable"); - - pSleepConditionVariableCS = (sSleepConditionVariableCS) - GetProcAddress(kernel32_module, "SleepConditionVariableCS"); - - pSleepConditionVariableSRW = (sSleepConditionVariableSRW) - GetProcAddress(kernel32_module, "SleepConditionVariableSRW"); - - pWakeAllConditionVariable = (sWakeAllConditionVariable) - GetProcAddress(kernel32_module, "WakeAllConditionVariable"); - - pWakeConditionVariable = (sWakeConditionVariable) - GetProcAddress(kernel32_module, "WakeConditionVariable"); pGetFinalPathNameByHandleW = (sGetFinalPathNameByHandleW) GetProcAddress(kernel32_module, "GetFinalPathNameByHandleW"); diff --git a/src/win/winapi.h b/src/win/winapi.h index 51808882..ed3d35c2 100644 --- a/src/win/winapi.h +++ b/src/win/winapi.h @@ -4659,25 +4659,6 @@ typedef BOOLEAN (WINAPI* sCreateSymbolicLinkW) LPCWSTR lpTargetFileName, DWORD dwFlags); -typedef VOID (WINAPI* sInitializeConditionVariable) - (PCONDITION_VARIABLE ConditionVariable); - -typedef BOOL (WINAPI* sSleepConditionVariableCS) - (PCONDITION_VARIABLE ConditionVariable, - PCRITICAL_SECTION CriticalSection, - DWORD dwMilliseconds); - -typedef BOOL (WINAPI* sSleepConditionVariableSRW) - (PCONDITION_VARIABLE ConditionVariable, - PSRWLOCK SRWLock, - DWORD dwMilliseconds, - ULONG Flags); - -typedef VOID (WINAPI* sWakeAllConditionVariable) - (PCONDITION_VARIABLE ConditionVariable); - -typedef VOID (WINAPI* sWakeConditionVariable) - (PCONDITION_VARIABLE ConditionVariable); typedef DWORD (WINAPI* sGetFinalPathNameByHandleW) (HANDLE hFile, @@ -4752,11 +4733,6 @@ extern sNtQuerySystemInformation pNtQuerySystemInformation; extern sGetQueuedCompletionStatusEx pGetQueuedCompletionStatusEx; extern sSetFileCompletionNotificationModes pSetFileCompletionNotificationModes; extern sCreateSymbolicLinkW pCreateSymbolicLinkW; -extern sInitializeConditionVariable pInitializeConditionVariable; -extern sSleepConditionVariableCS pSleepConditionVariableCS; -extern sSleepConditionVariableSRW pSleepConditionVariableSRW; -extern sWakeAllConditionVariable pWakeAllConditionVariable; -extern sWakeConditionVariable pWakeConditionVariable; extern sGetFinalPathNameByHandleW pGetFinalPathNameByHandleW;