Hello dear list.
I have a TCP client program build around three threads : a reader, a
writer, and a "connecter" that establish the connection and spawn the
reader and writer. It then wait for one of them to return before
cleaning and restarting. Here is the connecter loop :
void *connecter_thread(void *arg)
{
/* ... */
reader_pthid = pth_spawn(PTH_ATTR_DEFAULT, reader_thread, NULL);
writer_pthid = pth_spawn(PTH_ATTR_DEFAULT, writer_thread, NULL);
pth_event_t ev_r = pth_event(PTH_EVENT_TID|PTH_UNTIL_TID_DEAD,
reader_pthid);
pth_event_t ev_w = pth_event(PTH_EVENT_TID|PTH_UNTIL_TID_DEAD,
writer_pthid);
pth_event_t ev_ring = pth_event_concat(ev_r, ev_w, NULL);
while (reader_pthid && writer_pthid) {
int nonpending = pth_wait(ev_ring);
debug("%d event(s) occured", nonpending);
pth_event_t ev = ev_ring;
do {
if (pth_event_status(ev) == PTH_STATUS_OCCURRED) {
debug("occuring pth event %u",
(unsigned)pth_event_typeof(ev));
assert(pth_event_typeof(ev) ==
(PTH_EVENT_TID|PTH_UNTIL_TID_DEAD)); // FIXME: FAILS
pth_t dead_one;
pth_event_extract(ev, &dead_one);
if (dead_one == reader_pthid) reader_pthid =
NULL;
if (dead_one == writer_pthid) writer_pthid =
NULL;
}
ev = pth_event_walk(ev, PTH_WALK_NEXT);
} while (ev != ev_ring);
}
pth_event_free(ev_ring, PTH_FREE_ALL);
if (reader_pthid) (void)pth_cancel(reader_pthid);
if (writer_pthid) (void)pth_cancel(writer_pthid);
/* ... */
}
So my ring of events is composed of two events of type
PTH_EVENT_TID|PTH_UNTIL_TID_DEAD.
pth_wait returns indicating that 1 event occurred, but thereafter the
assertion fails because the event that occurred is of type 260, which is
PTH_EVENT_TID|PTH_EVENT_SELECT.
I do not understand this.
The reader and writer threads do use pth_select, but this is not
supposed to add an event on this threads event ring, is it ?
Perhaps my program broke the event linked list for some reason, but
probably I misunderstood something.
Any hint, someone ?
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