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Use pipes for telling signals to main thread when possible

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This commit is contained in:
Nick Mathewson 2012-02-10 16:25:53 -05:00
parent ca76cd931f
commit a35f396f28
1 changed files with 12 additions and 10 deletions
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22
signal.c
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@ -122,7 +122,7 @@ evsig_set_base(struct event_base *base)
EVSIGBASE_LOCK();
evsig_base = base;
evsig_base_n_signals_added = base->sig.ev_n_signals_added;
evsig_base_fd = base->sig.ev_signal_pair[0];
evsig_base_fd = base->sig.ev_signal_pair[1];
EVSIGBASE_UNLOCK();
}
@ -141,7 +141,11 @@ evsig_cb(evutil_socket_t fd, short what, void *arg)
memset(&ncaught, 0, sizeof(ncaught));
while (1) {
#ifdef _WIN32
n = recv(fd, signals, sizeof(signals), 0);
#else
n = read(fd, signals, sizeof(signals));
#endif
if (n == -1) {
int err = evutil_socket_geterror(fd);
if (! EVUTIL_ERR_RW_RETRIABLE(err))
@ -174,8 +178,7 @@ evsig_init(struct event_base *base)
* pair to wake up our event loop. The event loop then scans for
* signals that got delivered.
*/
if (evutil_socketpair(
AF_UNIX, SOCK_STREAM, 0, base->sig.ev_signal_pair) == -1) {
if (evutil_make_internal_pipe(base->sig.ev_signal_pair) == -1) {
#ifdef _WIN32
/* Make this nonfatal on win32, where sometimes people
have localhost firewalled. */
@ -186,18 +189,13 @@ evsig_init(struct event_base *base)
return -1;
}
evutil_make_socket_closeonexec(base->sig.ev_signal_pair[0]);
evutil_make_socket_closeonexec(base->sig.ev_signal_pair[1]);
if (base->sig.sh_old) {
mm_free(base->sig.sh_old);
}
base->sig.sh_old = NULL;
base->sig.sh_old_max = 0;
evutil_make_socket_nonblocking(base->sig.ev_signal_pair[0]);
evutil_make_socket_nonblocking(base->sig.ev_signal_pair[1]);
event_assign(&base->sig.ev_signal, base, base->sig.ev_signal_pair[1],
event_assign(&base->sig.ev_signal, base, base->sig.ev_signal_pair[0],
EV_READ | EV_PERSIST, evsig_cb, base);
base->sig.ev_signal.ev_flags |= EVLIST_INTERNAL;
@ -297,7 +295,7 @@ evsig_add(struct event_base *base, evutil_socket_t evsignal, short old, short ev
}
evsig_base = base;
evsig_base_n_signals_added = ++sig->ev_n_signals_added;
evsig_base_fd = base->sig.ev_signal_pair[0];
evsig_base_fd = base->sig.ev_signal_pair[1];
EVSIGBASE_UNLOCK();
event_debug(("%s: %d: changing signal handler", __func__, (int)evsignal));
@ -396,7 +394,11 @@ evsig_handler(int sig)
/* Wake up our notification mechanism */
msg = sig;
#ifdef _WIN32
send(evsig_base_fd, (char*)&msg, 1, 0);
#else
write(evsig_base_fd, (char*)&msg, 1);
#endif
errno = save_errno;
#ifdef _WIN32
EVUTIL_SET_SOCKET_ERROR(socket_errno);