Initial release

engine/vendor/vst3sdk/base/thread/source/flock.cpp

@@ -0,0 +1,126 @@
+//------------------------------------------------------------------------
+// Project     : SDK Base
+// Version     : 1.0
+//
+// Category    : Helpers
+// Filename    : base/thread/source/flock.cpp
+// Created by  : Steinberg, 1995
+// Description : Locks
+//
+//-----------------------------------------------------------------------------
+// This file is part of a Steinberg SDK. It is subject to the license terms
+// in the LICENSE file found in the top-level directory of this distribution
+// and at www.steinberg.net/sdklicenses. 
+// No part of the SDK, including this file, may be copied, modified, propagated,
+// or distributed except according to the terms contained in the LICENSE file.
+//-----------------------------------------------------------------------------
+
+#define DEBUG_LOCK 0
+
+#include "base/thread/include/flock.h"
+#include "base/source/fdebug.h"
+
+//------------------------------------------------------------------------
+#if SMTG_OS_WINDOWS
+//------------------------------------------------------------------------
+#ifndef WINVER
+#define WINVER 0x0500
+#endif
+#ifndef _WIN32_WINNT
+#define _WIN32_WINNT WINVER
+#endif
+
+#include <windows.h>
+#include <objbase.h>
+#define INIT_CS(cs) \
+	InitializeCriticalSection ((LPCRITICAL_SECTION)&cs);
+
+#endif // SMTG_OS_WINDOWS
+
+namespace Steinberg {
+namespace Base {
+namespace Thread {
+
+
+//------------------------------------------------------------------------
+//	FLock implementation
+//------------------------------------------------------------------------
+FLock::FLock (const char8* /*name*/)
+{
+#if SMTG_PTHREADS
+	pthread_mutexattr_t mutexAttr;
+	pthread_mutexattr_init (&mutexAttr);
+	pthread_mutexattr_settype (&mutexAttr, PTHREAD_MUTEX_RECURSIVE);
+	if (pthread_mutex_init (&mutex, &mutexAttr) != 0)
+		{SMTG_WARNING("mutex_init failed")}
+	pthread_mutexattr_destroy (&mutexAttr);
+
+#elif SMTG_OS_WINDOWS
+	INIT_CS (section)
+#else
+#warning implement FLock!
+#endif
+}
+
+//------------------------------------------------------------------------
+FLock::~FLock ()
+{
+#if SMTG_PTHREADS
+	pthread_mutex_destroy (&mutex);
+
+#elif SMTG_OS_WINDOWS
+	DeleteCriticalSection ((LPCRITICAL_SECTION)&section);
+		
+#endif
+}
+
+//------------------------------------------------------------------------
+void FLock::lock ()
+{
+#if DEBUG_LOCK
+	FDebugPrint ("FLock::lock () %x\n", this);
+#endif
+
+#if SMTG_PTHREADS
+	pthread_mutex_lock (&mutex);
+
+#elif SMTG_OS_WINDOWS
+	EnterCriticalSection ((LPCRITICAL_SECTION)&section);
+
+#endif
+}
+
+//------------------------------------------------------------------------
+void FLock::unlock ()
+{
+#if DEBUG_LOCK
+	FDebugPrint ("FLock::unlock () %x\n", this);
+#endif
+	
+#if SMTG_PTHREADS
+	pthread_mutex_unlock (&mutex);
+
+#elif SMTG_OS_WINDOWS
+	LeaveCriticalSection ((LPCRITICAL_SECTION)&section);
+
+#endif 
+}
+
+//------------------------------------------------------------------------
+bool FLock::trylock ()
+{
+#if SMTG_PTHREADS
+	return pthread_mutex_trylock (&mutex) == 0;
+
+#elif SMTG_OS_WINDOWS
+	return TryEnterCriticalSection ((LPCRITICAL_SECTION)&section) != 0 ? true : false;
+
+#else
+	return false;
+#endif 
+}
+
+//------------------------------------------------------------------------
+} // namespace Thread
+} // namespace Base
+} // namespace Steinberg