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Code Issues 1 Releases Wiki Activity

Hang forever instead of exit early on channel deadlock.

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While not technically needed, the behavior is more intuitive and will
prevent people from writing bad scripts.
This commit is contained in:
Calvin Rose 2021-10-20 19:53:29 -05:00
parent 66fbbeb5ec
commit 21a4ab4ec7
1 changed files with 12 additions and 8 deletions
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20
src/core/ev.c
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@ -830,8 +830,8 @@ static int janet_channel_push(JanetChannel *channel, Janet x, int mode) {
pending.mode = mode ? JANET_CP_MODE_CHOICE_WRITE : JANET_CP_MODE_WRITE;
janet_q_push(&channel->write_pending, &pending, sizeof(pending));
janet_chan_unlock(channel);
janet_ev_inc_refcount();
if (is_threaded) {
janet_ev_inc_refcount();
janet_gcroot(janet_wrap_fiber(pending.fiber));
}
return 1;
@ -848,6 +848,7 @@ static int janet_channel_push(JanetChannel *channel, Janet x, int mode) {
msg.argj = x;
janet_ev_post_event(vm, janet_thread_chan_cb, msg);
} else {
janet_ev_dec_refcount();
if (reader.mode == JANET_CP_MODE_CHOICE_READ) {
janet_schedule(reader.fiber, make_read_result(channel, x));
} else {
@ -880,8 +881,8 @@ static int janet_channel_pop(JanetChannel *channel, Janet *item, int is_choice)
pending.mode = is_choice ? JANET_CP_MODE_CHOICE_READ : JANET_CP_MODE_READ;
janet_q_push(&channel->read_pending, &pending, sizeof(pending));
janet_chan_unlock(channel);
janet_ev_inc_refcount();
if (is_threaded) {
janet_ev_inc_refcount();
janet_gcroot(janet_wrap_fiber(pending.fiber));
}
return 0;
@ -899,6 +900,7 @@ static int janet_channel_pop(JanetChannel *channel, Janet *item, int is_choice)
msg.argj = janet_wrap_nil();
janet_ev_post_event(vm, janet_thread_chan_cb, msg);
} else {
janet_ev_dec_refcount();
if (writer.mode == JANET_CP_MODE_CHOICE_WRITE) {
janet_schedule(writer.fiber, make_write_result(channel));
} else {
@ -1102,6 +1104,7 @@ JANET_CORE_FN(cfun_channel_close,
msg.argj = janet_wrap_nil();
janet_ev_post_event(vm, janet_thread_chan_cb, msg);
} else {
janet_ev_dec_refcount();
if (writer.mode == JANET_CP_MODE_CHOICE_WRITE) {
janet_schedule(writer.fiber, janet_wrap_nil());
} else {
@ -1121,6 +1124,7 @@ JANET_CORE_FN(cfun_channel_close,
msg.argj = janet_wrap_nil();
janet_ev_post_event(vm, janet_thread_chan_cb, msg);
} else {
janet_ev_dec_refcount();
if (reader.mode == JANET_CP_MODE_CHOICE_READ) {
janet_schedule(reader.fiber, janet_wrap_nil());
} else {
@ -1192,12 +1196,12 @@ JanetFiber *janet_loop1(void) {
/* This is a deadline (for a fiber, not a function call) */
JanetFiberStatus s = janet_fiber_status(to.curr_fiber);
int isFinished = (s == JANET_STATUS_DEAD ||
s == JANET_STATUS_ERROR ||
s == JANET_STATUS_USER0 ||
s == JANET_STATUS_USER1 ||
s == JANET_STATUS_USER2 ||
s == JANET_STATUS_USER3 ||
s == JANET_STATUS_USER4);
s == JANET_STATUS_ERROR ||
s == JANET_STATUS_USER0 ||
s == JANET_STATUS_USER1 ||
s == JANET_STATUS_USER2 ||
s == JANET_STATUS_USER3 ||
s == JANET_STATUS_USER4);
if (!isFinished) {
janet_cancel(to.fiber, janet_cstringv("deadline expired"));
}