eina/lock: when debug threads are enabled, always call trylock in lock function

Summary:
when debugging thread issues, it's not actually helpful to immediately
deadlock--this defeats any attempt at debugging. instead, call trylock first
in order to detect a possible deadlock and then throw an error which can be
caught by the user
Depends on D6374

Reviewers: ManMower, devilhorns

Reviewed By: devilhorns

Subscribers: cedric, #committers

Tags: #efl

Differential Revision: https://phab.enlightenment.org/D6375

src/lib/eina/eina_inline_lock_posix.x

@@ -249,6 +249,10 @@ eina_lock_take(Eina_Lock *mutex)
      }
 #endif
 
+#ifdef EINA_HAVE_DEBUG_THREADS
+   if (eina_lock_take_try(mutex) == EINA_LOCK_SUCCEED) return EINA_LOCK_SUCCEED;
+#endif
+
 #ifdef EINA_HAVE_DEBUG_THREADS
    if (_eina_threads_debug)
      {
@@ -654,6 +658,10 @@ eina_spinlock_take(Eina_Spinlock *spinlock)
 #if defined(EINA_HAVE_POSIX_SPINLOCK)
    int t;
 
+#ifdef EINA_HAVE_DEBUG_THREADS
+   if (eina_spinlock_take_try(spinlock) == EINA_LOCK_SUCCEED) return EINA_LOCK_SUCCEED;
+#endif
+
    for (;;)
      {
         t = pthread_spin_lock(spinlock);