src/thread/windows/SDL_sysmutex.c
changeset 5062 e8916fe9cfc8
parent 3697 f7b03b6838cb
child 5090 327f181542f1
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/thread/windows/SDL_sysmutex.c	Thu Jan 20 18:04:05 2011 -0800
@@ -0,0 +1,102 @@
+/*
+    SDL - Simple DirectMedia Layer
+    Copyright (C) 1997-2010 Sam Lantinga
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Lesser General Public
+    License as published by the Free Software Foundation; either
+    version 2.1 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
+    Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public
+    License along with this library; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+
+    Sam Lantinga
+    slouken@libsdl.org
+*/
+#include "SDL_config.h"
+
+/* Mutex functions using the Win32 API */
+
+#define WIN32_LEAN_AND_MEAN
+#include <windows.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 *) SDL_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");
+            SDL_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;
+        }
+        SDL_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);
+}
+
+/* vi: set ts=4 sw=4 expandtab: */