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Event loop on Windows: woken over a loopback TCP connection

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WSAPoll() never reported the UDP socket which sent to itself to wake the
loop: a message from another thread waited for the timeout, and
loopstop() did not end looprun(). The loop is woken over a TCP
connection on the loopback instead, as its sockets are reported.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Vladimir Dubrovin 2026-10-24 22:17:19 +03:00
parent 30f6043160
commit 835ce04295
1 changed files with 19 additions and 9 deletions
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28
src/loop.c
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@ -56,22 +56,31 @@ static int wakeinit(struct loop *l){
if(fd < 0) return 1;
l->wakerd = l->wakewr = fd;
#elif defined _WIN32
/* no pipe to poll: a UDP socket sending to itself */
/* no pipe to poll: a TCP connection over the loopback, which WSAPoll()
reports as it does not a UDP socket sending to itself */
struct sockaddr_in sa;
int len = sizeof(sa);
SOCKET s = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
int len = sizeof(sa), one = 1;
SOCKET ls = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP), a = INVALID_SOCKET, b = INVALID_SOCKET;
if(s == INVALID_SOCKET) return 1;
if(ls == INVALID_SOCKET) return 1;
memset(&sa, 0, sizeof(sa));
sa.sin_family = AF_INET;
sa.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
if(bind(s, (struct sockaddr *)&sa, sizeof(sa)) || getsockname(s, (struct sockaddr *)&sa, &len) ||
connect(s, (struct sockaddr *)&sa, sizeof(sa))){
closesocket(s);
if(bind(ls, (struct sockaddr *)&sa, sizeof(sa)) || listen(ls, 1) ||
getsockname(ls, (struct sockaddr *)&sa, &len) ||
(a = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) == INVALID_SOCKET ||
connect(a, (struct sockaddr *)&sa, sizeof(sa)) ||
(b = accept(ls, NULL, NULL)) == INVALID_SOCKET){
if(a != INVALID_SOCKET) closesocket(a);
closesocket(ls);
return 1;
}
setnonblock(s);
l->wakerd = l->wakewr = s;
closesocket(ls);
setsockopt(a, IPPROTO_TCP, TCP_NODELAY, (char *)&one, sizeof(one));
setnonblock(a);
setnonblock(b);
l->wakewr = a;
l->wakerd = b;
#else
int p[2];
@ -89,6 +98,7 @@ static int wakeinit(struct loop *l){
static void wakefree(struct loop *l){
#ifdef _WIN32
closesocket(l->wakerd);
closesocket(l->wakewr);
#else
close(l->wakerd);
if(l->wakewr != l->wakerd) close(l->wakewr);