+static int signal_compare(const signal_t *a, const signal_t *b) {
+ return (int)a->signum - (int)b->signum;
+}
+
+static void signalio_handler(event_loop_t *loop, void *data, int flags) {
+ (void)data;
+ (void)flags;
+ unsigned char signum;
+
+ if(read(loop->pipefd[0], &signum, 1) != 1) {
+ return;
+ }
+
+ signal_t *sig = splay_search(&loop->signals, &(signal_t) {
+ .signum = signum
+ });
+
+ if(sig) {
+ atomic_flag_clear(&sig->set);
+ sig->cb(loop, sig->data);
+ }
+}
+
+static void pipe_init(event_loop_t *loop) {
+ int result = pipe(loop->pipefd);
+ assert(result == 0);
+
+ if(result == 0) {
+ io_add(loop, &loop->signalio, signalio_handler, NULL, loop->pipefd[0], IO_READ);
+ }
+}
+
+static void pipe_exit(event_loop_t *loop) {
+ io_del(loop, &loop->signalio);
+
+ close(loop->pipefd[0]);
+ close(loop->pipefd[1]);
+
+ loop->pipefd[0] = -1;
+ loop->pipefd[1] = -1;
+}
+
+void signal_trigger(event_loop_t *loop, signal_t *sig) {
+ if(atomic_flag_test_and_set(&sig->set)) {
+ return;
+ }
+
+ uint8_t signum = sig->signum;
+ write(loop->pipefd[1], &signum, 1);
+ return;
+}
+
+void signal_add(event_loop_t *loop, signal_t *sig, signal_cb_t cb, void *data, uint8_t signum) {
+ assert(!sig->cb);
+
+ sig->cb = cb;
+ sig->data = data;
+ sig->signum = signum;
+ sig->node.data = sig;
+
+ atomic_flag_clear(&sig->set);
+
+ if(loop->pipefd[0] == -1) {
+ pipe_init(loop);
+ }
+
+ if(!splay_insert_node(&loop->signals, &sig->node)) {
+ abort();
+ }
+}
+
+void signal_del(event_loop_t *loop, signal_t *sig) {
+ assert(sig->cb);
+
+ loop->deletion = true;
+
+ splay_unlink_node(&loop->signals, &sig->node);
+ sig->cb = NULL;
+
+ if(!loop->signals.count && loop->pipefd[0] != -1) {
+ pipe_exit(loop);
+ }
+}
+
+void idle_set(event_loop_t *loop, idle_cb_t cb, void *data) {
+ loop->idle_cb = cb;
+ loop->idle_data = data;
+}
+
+bool event_loop_run(event_loop_t *loop, pthread_mutex_t *mutex) {
+ assert(mutex);