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libsst-concurrency/SST_Mutex_Win32.c

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+/*
+	SST_Mutex_Win32.c
+	Author: Patrick Baggett <ptbaggett@762studios.com>
+	Created: 12/20/2011
+
+	Purpose: 
+
+	libsst-concurrency mutex functions for Win32 platforms (Windows 7 or later)
+
+	License:
+
+	This program is free software. It comes without any warranty, to
+	the extent permitted by applicable law. You can redistribute it
+	and/or modify it under the terms of the Do What The Fuck You Want
+	To Public License, Version 2, as published by Sam Hocevar. See
+	http://sam.zoy.org/wtfpl/COPYING for more details.
+
+*/
+
+#include <SST/SST_Mutex.h>
+
+#define _WIN32_WINNT 0x0601 /* Windows 7 or later */
+#include <windows.h>
+
+#define SST_DEFAULT_SPINCOUNT 5500
+
+/*************************************************************************/
+
+SST_Mutex SST_Concurrency_CreateMutex(void)
+{
+	CRITICAL_SECTION* cs = HeapAlloc(GetProcessHeap(), 0, sizeof(CRITICAL_SECTION));
+
+	/* No memory? */
+	if(!cs)
+		return NULL;
+
+	InitializeCriticalSectionAndSpinCount(cs, SST_DEFAULT_SPINCOUNT);
+
+	return (SST_Mutex)cs;
+}
+
+/*************************************************************************/
+
+void SST_Concurrency_DestroyMutex(SST_Mutex _mutex)
+{
+	CRITICAL_SECTION* cs = (CRITICAL_SECTION*)_mutex;
+
+	DeleteCriticalSection(cs);
+	HeapFree(GetProcessHeap(), 0, cs);
+}
+
+/*************************************************************************/
+
+void SST_Concurrency_LockMutex(SST_Mutex _mutex)
+{
+	CRITICAL_SECTION* cs = (CRITICAL_SECTION*)_mutex;
+
+	EnterCriticalSection(cs);
+}
+
+/*************************************************************************/
+
+int SST_Concurrency_TryLockMutex(SST_Mutex _mutex)
+{
+	CRITICAL_SECTION* cs = (CRITICAL_SECTION*)_mutex;
+
+	return (int)TryEnterCriticalSection(cs);
+}
+
+/*************************************************************************/
+
+void SST_Concurrency_UnlockMutex(SST_Mutex _mutex)
+{
+	CRITICAL_SECTION* cs = (CRITICAL_SECTION*)_mutex;
+	LeaveCriticalSection(cs);
+}
+