warn on stderr when a signal handler is called on a thread not managed by PHP

Author: dunglas

Zend/zend_execute_API.c

@@ -1356,7 +1356,11 @@ ZEND_API ZEND_NORETURN void ZEND_FASTCALL zend_timeout(void) /* {{{ */
 static void zend_timeout_handler(int dummy) /* {{{ */
 {
 #ifdef ZTS
-	if (!tsrm_is_managed_thread()) return;
+	if (!tsrm_is_managed_thread()) {
+		fprintf(stderr, "zend_timeout_handler() called called in a thread not managed by PHP. The expected signal handler will not be called. This is probably a bug.\n");
+
+		return;
+	}
 #else
 	if (zend_atomic_bool_load_ex(&EG(timed_out))) {
 		/* Die on hard timeout */

Zend/zend_signal.c

@@ -87,7 +87,11 @@ void zend_signal_handler_defer(int signo, siginfo_t *siginfo, void *context)
 	zend_signal_queue_t *queue, *qtmp;
 
 #ifdef ZTS
-	if (!tsrm_is_managed_thread()) return;
+	if (!tsrm_is_managed_thread()) {
+		fprintf(stderr, "zend_signal_handler_defer() called called in a thread not managed by PHP. The expected signal handler will not be called. This is probably a bug.\n");
+
+		return;
+	}
 
 	/* A signal could hit after TSRM shutdown, in this case globals are already freed. */
 	if (tsrm_is_shutdown()) {