Patch adding Wii support by tueidj, part 6: mutexes

For the Wii, SDL's mutex functionality is used.  The implementation in the
original patch was wrong though, so this part required non-trivial changes.

git-svn-id: https://svn.eduke32.com/eduke32@2626 1a8010ca-5511-0410-912e-c29ae57300e0

polymer/eduke32/build/include/mutex.h

@@ -1,17 +1,25 @@
 #ifndef __mutex_h__
 #define __mutex_h__
 
+/* Mutual exclusion mechanism wrappers for the different platforms */
+
 #if defined(_WIN32)
-#include <windows.h>
+# include <windows.h>
-#include <process.h>
+# include <process.h>
+#elif !defined GEKKO
+# include <pthread.h>
 #else
-#include <pthread.h>
+# include <SDL.h>
 #endif
 
 #if defined(_WIN32)
 typedef HANDLE mutex_t;
-#else
+#elif !defined GEKKO
 typedef pthread_mutex_t mutex_t;
+#else
+/* PK: I don't like pointer typedefs, but SDL_CreateMutex() _returns_ one,
+ *     so we're out of luck with our interface. */
+typedef SDL_mutex* mutex_t;
 #endif
 
 extern int32_t mutex_init(mutex_t *mutex);

polymer/eduke32/build/src/mutex.c

@@ -6,30 +6,37 @@ int32_t mutex_init(mutex_t *mutex)
 #ifdef _WIN32
     *mutex = CreateMutex(0, FALSE, 0);
     return (*mutex == 0);
-#else
+#elif !defined GEKKO
     return pthread_mutex_init(mutex, NULL);
-#endif
+#else
+    if (mutex)
+    {
+        *mutex = SDL_CreateMutex();
+        if (*mutex != NULL)
+            return 0;
+    }
     return -1;
+#endif
 }
 
 int32_t mutex_lock(mutex_t *mutex)
 {
 #ifdef _WIN32
     return (WaitForSingleObject(*mutex, INFINITE) == WAIT_FAILED);
-#else
+#elif !defined GEKKO
     return pthread_mutex_lock(mutex);
+#else
+    return SDL_LockMutex(*mutex);
 #endif
-    return -1;
 }
 
 int32_t mutex_unlock(mutex_t *mutex)
 {
 #ifdef _WIN32
     return (ReleaseMutex(*mutex) == 0);
-#else
+#elif !defined GEKKO
     return pthread_mutex_unlock(mutex);
+#else
+    return SDL_UnlockMutex(*mutex);
 #endif
-    return -1;
 }
-
-