Add cond_wait_timeout()

Add a "timed out" version of cond_wait().

app/src/lock_util.c

@@ -28,6 +28,16 @@ cond_wait(SDL_cond *cond, SDL_mutex *mutex) {
     }
 }
 
+int
+cond_wait_timeout(SDL_cond *cond, SDL_mutex *mutex, uint32_t ms) {
+    int r = SDL_CondWaitTimeout(cond, mutex, ms);
+    if (r < 0) {
+        LOGC("Could not wait on condition with timeout");
+        abort();
+    }
+    return r;
+}
+
 void
 cond_signal(SDL_cond *cond) {
     if (SDL_CondSignal(cond)) {

app/src/lock_util.h

@@ -1,6 +1,8 @@
 #ifndef LOCKUTIL_H
 #define LOCKUTIL_H
 
+#include <stdint.h>
+
 // forward declarations
 typedef struct SDL_mutex SDL_mutex;
 typedef struct SDL_cond SDL_cond;
@@ -14,6 +16,10 @@ mutex_unlock(SDL_mutex *mutex);
 void
 cond_wait(SDL_cond *cond, SDL_mutex *mutex);
 
+// return 0 or SDL_MUTEX_TIMEDOUT
+int
+cond_wait_timeout(SDL_cond *cond, SDL_mutex *mutex, uint32_t ms);
+
 void
 cond_signal(SDL_cond *cond);