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async - check if fd is already ready

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Lorenz Stechauner
2022-12-29 11:31:52 +01:00
parent f9b3cc29ab
commit f92c26c350
1 changed files with 23 additions and 2 deletions
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25
src/async.c
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@ -37,11 +37,11 @@ static pthread_t thread = -1;
static int async_add_to_queue(evt_listen_t *evt) { static int async_add_to_queue(evt_listen_t *evt) {
// TODO locking // TODO locking
memcpy(&listen->q[listen->n++], evt, sizeof(*evt)); memcpy(&listen->q[listen->n++], evt, sizeof(*evt));
if (thread != -1) pthread_kill(thread, SIGUSR1);
return 0; return 0;
} }
int async(int fd, short events, int flags, void cb(void *), void *arg, void err_cb(void *), void *err_arg) { int async(int fd, short events, int flags, void cb(void *), void *arg, void err_cb(void *), void *err_arg) {
struct pollfd fds[1] = {{.fd = fd, .events = events}};
evt_listen_t evt = { evt_listen_t evt = {
.fd = fd, .fd = fd,
.events = events, .events = events,
@ -51,7 +51,28 @@ int async(int fd, short events, int flags, void cb(void *), void *arg, void err_
.err_cb = err_cb, .err_cb = err_cb,
.err_arg = err_arg, .err_arg = err_arg,
}; };
return async_add_to_queue(&evt);
// check, if fd is already ready
if (poll(fds, 1, 0) == 1) {
// fd already read
if (fds[0].revents & events) {
// specified event(s) occurred
cb(arg);
if (!(flags & ASYNC_KEEP))
return 0;
} else if (fds[0].revents & (POLLERR | POLLHUP | POLLNVAL)) {
// error occurred
err_cb(err_arg);
return 0;
}
}
int ret = async_add_to_queue(&evt);
if (ret == 0 && thread != -1)
pthread_kill(thread, SIGUSR1);
return ret;
} }
void async_thread(void) { void async_thread(void) {