Handle condition variable failure

Add condition variables function wrappers to handle unexpected failure.

app/src/decoder.c

@@ -24,7 +24,7 @@ static void push_frame(struct decoder *decoder) {
     mutex_lock(frames->mutex);
     if (!decoder->skip_frames) {
         while (!frames->rendering_frame_consumed) {
-            SDL_CondWait(frames->rendering_frame_consumed_cond, frames->mutex);
+            cond_wait(frames->rendering_frame_consumed_cond, frames->mutex);
         }
     } else if (!frames->rendering_frame_consumed) {
         SDL_LogInfo(SDL_LOG_CATEGORY_RENDER, "Skip frame");

app/src/lockutil.h

@@ -19,4 +19,18 @@ static inline void mutex_unlock(SDL_mutex *mutex) {
     }
 }
 
+static inline void cond_wait(SDL_cond *cond, SDL_mutex *mutex) {
+    if (SDL_CondWait(cond, mutex)) {
+        SDL_LogCritical(SDL_LOG_CATEGORY_SYSTEM, "Could not wait on condition");
+        exit(1);
+    }
+}
+
+static inline void cond_signal(SDL_cond *cond) {
+    if (SDL_CondSignal(cond)) {
+        SDL_LogCritical(SDL_LOG_CATEGORY_SYSTEM, "Could not signal a condition");
+        exit(1);
+    }
+}
+
 #endif

app/src/screen.c

@@ -353,7 +353,7 @@ SDL_bool show_screen(const char *serial, Uint16 local_port) {
             AVFrame *frame = frames.rendering_frame;
             frames.rendering_frame_consumed = SDL_TRUE;
             if (!decoder.skip_frames) {
-                SDL_CondSignal(frames.rendering_frame_consumed_cond);
+                cond_signal(frames.rendering_frame_consumed_cond);
             }
 
             struct size current_frame_size = {frame->width, frame->height};