Avoid unnecessary main browser check

emscripten_check_blocking_allowed will do this for us.

Author: kleisauke

system/lib/libc/musl/src/thread/pthread_cond_timedwait.c

@@ -77,9 +77,7 @@ int __pthread_cond_timedwait(pthread_cond_t *restrict c, pthread_mutex_t *restri
 
 #ifdef __EMSCRIPTEN__
 	// TODO: Optimize this away in MINIMAL_RUNTIME.
-	if (emscripten_is_main_browser_thread()) {
-		emscripten_check_blocking_allowed();
-	}
+	emscripten_check_blocking_allowed();
 #endif
 
 	if ((m->_m_type&15) && (m->_m_lock&INT_MAX) != __pthread_self()->tid)

system/lib/libc/musl/src/thread/pthread_join.c

@@ -13,7 +13,6 @@ static int __pthread_timedjoin_np(pthread_t t, void **res, const struct timespec
 	if (!t || t->self != t) {
 		return ESRCH;
 	}
-	int is_browser_thread = emscripten_is_main_browser_thread();
 #endif
 
 	int state, cs, r = 0;
@@ -29,9 +28,8 @@ static int __pthread_timedjoin_np(pthread_t t, void **res, const struct timespec
 		}
 		// XXX Emscripten we need to check if blocking is allowed when the initially state is joinable.
 		// Note that detached and exiting/exited threads can be joined without blocking.
-		if (r == 0 && state == DT_JOINABLE && is_browser_thread) {
+		if (r == 0 && state == DT_JOINABLE)
 			emscripten_check_blocking_allowed();
-		}
 #else
 		if (state >= DT_DETACHED) a_crash();
 #endif