libbpg-0.9.6

x265/source/common/winxp.cpp

@@ -0,0 +1,130 @@
+/*****************************************************************************
+ * Copyright (C) 2013 x265 project
+ *
+ * Authors: Steve Borho <steve@borho.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02111, USA.
+ *
+ * This program is also available under a commercial proprietary license.
+ * For more information, contact us at license @ x265.com
+ *****************************************************************************/
+
+#include "threading.h"
+
+#if defined(_WIN32) && (_WIN32_WINNT < 0x0600) // _WIN32_WINNT_VISTA
+
+namespace X265_NS {
+/* Mimic CONDITION_VARIABLE functions only supported on Vista+ */
+
+int WINAPI cond_init(ConditionVariable *cond)
+{ // InitializeConditionVariable
+    cond->semaphore = CreateSemaphore(NULL, 0, 0x7fffffff, NULL);
+    if (!cond->semaphore)
+        return -1;
+    cond->waitersDone = CreateEvent(NULL, FALSE, FALSE, NULL);
+    if (!cond->waitersDone)
+        return -1;
+
+    InitializeCriticalSection(&cond->waiterCountMutex);
+    InitializeCriticalSection(&cond->broadcastMutex);
+    cond->waiterCount = 0;
+    cond->bIsBroadcast = false;
+
+    return 0;
+}
+
+void WINAPI cond_broadcast(ConditionVariable *cond)
+{ // WakeAllConditionVariable
+    EnterCriticalSection(&cond->broadcastMutex);
+    EnterCriticalSection(&cond->waiterCountMutex);
+    int haveWaiter = 0;
+
+    if (cond->waiterCount)
+    {
+        cond->bIsBroadcast = 1;
+        haveWaiter = 1;
+    }
+
+    if (haveWaiter)
+    {
+        ReleaseSemaphore(cond->semaphore, cond->waiterCount, NULL);
+        LeaveCriticalSection(&cond->waiterCountMutex);
+        WaitForSingleObject(cond->waitersDone, INFINITE);
+        cond->bIsBroadcast = 0;
+    }
+    else
+        LeaveCriticalSection(&cond->waiterCountMutex);
+
+    LeaveCriticalSection(&cond->broadcastMutex);
+}
+
+void WINAPI cond_signal(ConditionVariable *cond)
+{ // WakeConditionVariable
+    EnterCriticalSection(&cond->broadcastMutex);
+    EnterCriticalSection(&cond->waiterCountMutex);
+    int haveWaiter = cond->waiterCount;
+    LeaveCriticalSection(&cond->waiterCountMutex);
+
+    if (haveWaiter)
+    {
+        ReleaseSemaphore(cond->semaphore, 1, NULL);
+        WaitForSingleObject(cond->waitersDone, INFINITE);
+    }
+
+    LeaveCriticalSection(&cond->broadcastMutex);
+}
+
+BOOL WINAPI cond_wait(ConditionVariable *cond, CRITICAL_SECTION *mutex, DWORD wait)
+{ // SleepConditionVariableCS
+    EnterCriticalSection(&cond->broadcastMutex);
+    EnterCriticalSection(&cond->waiterCountMutex);
+    cond->waiterCount++;
+    LeaveCriticalSection(&cond->waiterCountMutex);
+    LeaveCriticalSection(&cond->broadcastMutex);
+
+    // unlock the external mutex
+    LeaveCriticalSection(mutex);
+    BOOL ret = WaitForSingleObject(cond->semaphore, wait);
+
+    EnterCriticalSection(&cond->waiterCountMutex);
+    cond->waiterCount--;
+    int last_waiter = !cond->waiterCount || !cond->bIsBroadcast;
+    LeaveCriticalSection(&cond->waiterCountMutex);
+
+    if (last_waiter)
+        SetEvent(cond->waitersDone);
+
+    // lock the external mutex
+    EnterCriticalSection(mutex);
+
+    // returns false on timeout or error
+    return ret;
+}
+
+/* Native CONDITION_VARIABLE instances are not freed, so this is a special case */
+void cond_destroy(ConditionVariable *cond)
+{
+    CloseHandle(cond->semaphore);
+    CloseHandle(cond->waitersDone);
+    DeleteCriticalSection(&cond->broadcastMutex);
+    DeleteCriticalSection(&cond->waiterCountMutex);
+}
+} // namespace X265_NS
+
+#elif defined(_MSC_VER)
+
+namespace { int _avoid_linker_warnings = 0; }
+
+#endif // _WIN32_WINNT <= _WIN32_WINNT_WINXP