Initial revision

--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%401

src/thread/win32/SDL_sysmutex.c

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+/*
+    SDL - Simple DirectMedia Layer
+    Copyright (C) 1997, 1998, 1999, 2000, 2001  Sam Lantinga
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Library General Public
+    License as published by the Free Software Foundation; either
+    version 2 of the License, or (at your option) any later version.
+
+    This library 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
+    Library General Public License for more details.
+
+    You should have received a copy of the GNU Library General Public
+    License along with this library; if not, write to the Free
+    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+    Sam Lantinga
+    slouken@devolution.com
+*/
+
+#ifdef SAVE_RCSID
+static char rcsid =
+ "@(#) $Id$";
+#endif
+
+/* Mutex functions using the Win32 API */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <windows.h>
+
+#include "SDL_error.h"
+#include "SDL_mutex.h"
+
+
+struct SDL_mutex {
+	HANDLE id;
+};
+
+/* Create a mutex */
+SDL_mutex *SDL_CreateMutex(void)
+{
+	SDL_mutex *mutex;
+
+	/* Allocate mutex memory */
+	mutex = (SDL_mutex *)malloc(sizeof(*mutex));
+	if ( mutex ) {
+		/* Create the mutex, with initial value signaled */
+		mutex->id = CreateMutex(NULL, FALSE, NULL);
+		if ( ! mutex->id ) {
+			SDL_SetError("Couldn't create mutex");
+			free(mutex);
+			mutex = NULL;
+		}
+	} else {
+		SDL_OutOfMemory();
+	}
+	return(mutex);
+}
+
+/* Free the mutex */
+void SDL_DestroyMutex(SDL_mutex *mutex)
+{
+	if ( mutex ) {
+		if ( mutex->id ) {
+			CloseHandle(mutex->id);
+			mutex->id = 0;
+		}
+		free(mutex);
+	}
+}
+
+/* Lock the mutex */
+int SDL_mutexP(SDL_mutex *mutex)
+{
+	if ( mutex == NULL ) {
+		SDL_SetError("Passed a NULL mutex");
+		return -1;
+	}
+	if ( WaitForSingleObject(mutex->id, INFINITE) == WAIT_FAILED ) {
+		SDL_SetError("Couldn't wait on mutex");
+		return -1;
+	}
+	return(0);
+}
+
+/* Unlock the mutex */
+int SDL_mutexV(SDL_mutex *mutex)
+{
+	if ( mutex == NULL ) {
+		SDL_SetError("Passed a NULL mutex");
+		return -1;
+	}
+	if ( ReleaseMutex(mutex->id) == FALSE ) {
+		SDL_SetError("Couldn't release mutex");
+		return -1;
+	}
+	return(0);
+}