Use atomic operations to check whether to write to the signal pipe.

[meshlink] / src / event.c

diff --git a/src/event.c b/src/event.c
index 5e9763e2702835672c760d93115787308726dab6..43e4e0401d941601b0ffc3818720655a0edc505c 100644 (file)
--- a/src/event.c
+++ b/src/event.c
@@ -199,7 +199,7 @@ static void signalio_handler(event_loop_t *loop, void *data, int flags) {
        });
 
        if(sig) {
-               sig->set = false;
+               atomic_flag_clear(&sig->set);
                sig->cb(loop, sig->data);
        }
 }
@@ -224,12 +224,11 @@ static void pipe_exit(event_loop_t *loop) {
 }
 
 void signal_trigger(event_loop_t *loop, signal_t *sig) {
-       if(sig->set) {
+       if(atomic_flag_test_and_set(&sig->set)) {
                return;
        }
 
        uint8_t signum = sig->signum;
-       sig->set = true;
        write(loop->pipefd[1], &signum, 1);
        return;
 }
@@ -240,9 +239,10 @@ void signal_add(event_loop_t *loop, signal_t *sig, signal_cb_t cb, void *data, u
        sig->cb = cb;
        sig->data = data;
        sig->signum = signum;
-       sig->set = false;
        sig->node.data = sig;
 
+       atomic_flag_clear(&sig->set);
+
        if(loop->pipefd[0] == -1) {
                pipe_init(loop);
        }