improved debug print out

Author: fangfufu

src/util.c

@@ -143,12 +143,15 @@ void _SEM_DESTROY_(sem_t *sem, const char *file, const char *func, int line,
 void _SEM_WAIT_(const char *file, const char *func, int line, sem_t *sem,
                 const char *sem_name)
 {
-    // log_printf(debug, file, func, line,
-    //            "%x sem_wait: %p, %s\n", pthread_self(), sem, sem_name);
+#ifdef DEBUG
     int j;
-    sem_getvalue(sem, &j);
+    if (sem_getvalue(sem, &j)) {
+        log_printf(fatal, file, func, line,
+                   "%x sem_getvalue: %s\n", pthread_self(), strerror(errno));
+    }
     log_printf(debug, file, func, line,
                "%x sem_wait: %p, %s, value: %d\n", pthread_self(), sem, sem_name, j);
+#endif
     int i;
     i = sem_wait(sem);
     if (i) {