+ shutdown_destructors_async Support for concurrent iteration of the global variable table

Author: EdmondDantes

coroutine.c

@@ -774,6 +774,9 @@ ZEND_STACK_ALIGNED void async_coroutine_execute(zend_fiber_transfer *transfer)
 	// The scheduler coroutine always terminates into the main execution flow.
 	//
 	if (UNEXPECTED(&coroutine->coroutine == ZEND_ASYNC_SCHEDULER)) {
+
+		ZEND_ASYNC_SCHEDULER = NULL;
+
 		if (transfer != ASYNC_G(main_transfer)) {
 
 			if (UNEXPECTED(Z_TYPE(transfer->value) == IS_OBJECT)) {

scheduler.c

@@ -348,10 +348,8 @@ static void async_scheduler_dtor(void)
 	zend_hash_destroy(&ASYNC_G(coroutines));
 	zend_hash_init(&ASYNC_G(coroutines), 0, NULL, NULL, 0);
 
-	ZEND_ASYNC_CURRENT_COROUTINE = NULL;
 	ZEND_ASYNC_GRACEFUL_SHUTDOWN = false;
 	ZEND_ASYNC_SCHEDULER_CONTEXT = false;
-	ZEND_ASYNC_DEACTIVATE;
 
 	zend_exception_restore();
 }
@@ -656,6 +654,9 @@ void async_scheduler_main_coroutine_suspend(void)
 
 	switch_to_scheduler(NULL);
 
+	ZEND_ASYNC_CURRENT_COROUTINE = NULL;
+	ZEND_ASYNC_DEACTIVATE;
+
 	if (ASYNC_G(main_transfer)) {
 		efree(ASYNC_G(main_transfer));
 		ASYNC_G(main_transfer) = NULL;

tests/spawn/013-spawn_in_shutdown.phpt

@@ -10,7 +10,7 @@ register_shutdown_function(function() {
 
     try {
         spawn(function() {
-            echo "should not execute\n";
+            echo "should execute\n";
         });
         echo "spawn succeeded\n";
     } catch (Async\AsyncException $e) {
@@ -33,5 +33,6 @@ start
 end
 normal spawn works
 shutdown handler start
-Error: Cannot spawn a coroutine when async is disabled
-shutdown handler end
+spawn succeeded
+shutdown handler end
+should execute