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Make poll work by going back to array of listeners for gc keeping.

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This commit is contained in:
Calvin Rose 2023-09-26 22:57:01 -05:00
parent a96971c8a7
commit d12464fc0e
3 changed files with 48 additions and 50 deletions
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92
src/core/ev.c
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@ -275,6 +275,7 @@ static JanetListenerState *janet_listen_impl(JanetStream *stream, JanetListener
JanetListenerState *state = janet_abstract(&janet_listener_AT, size);
state->machine = behavior;
state->fiber = janet_vm.root_fiber;
state->flags = 0;
janet_vm.root_fiber->waiting = state;
if (mask & JANET_ASYNC_LISTEN_READ) stream->read_state = state;
if (mask & JANET_ASYNC_LISTEN_WRITE) stream->write_state = state;
@ -282,7 +283,8 @@ static JanetListenerState *janet_listen_impl(JanetStream *stream, JanetListener
state->event = user;
state->machine(state, JANET_ASYNC_EVENT_INIT);
janet_ev_inc_refcount();
janet_table_put(&janet_vm.listeners, janet_wrap_abstract(state), janet_wrap_true());
state->index = janet_vm.listeners->count;
janet_array_push(janet_vm.listeners, janet_wrap_abstract(state));
return state;
bad_listen_write:
janet_panic("cannot listen for duplicate write event on stream");
@ -298,8 +300,14 @@ void janet_fiber_did_resume(JanetFiber *fiber) {
}
static void janet_unlisten_impl(JanetListenerState *state) {
janet_table_remove(&janet_vm.listeners, janet_wrap_abstract(state));
/* Move last listener to position of this listener - O(1) removal and keep things densely packed. */
if (state->stream) {
Janet popped = janet_array_pop(janet_vm.listeners);
janet_assert(janet_checktype(popped, JANET_ABSTRACT), "pop check");
JanetListenerState *popped_state = (JanetListenerState *) janet_unwrap_abstract(popped);
janet_vm.listeners->data[state->index] = popped;
popped_state->index = state->index;
state->index = UINT32_MAX; /* just in case */
janet_ev_dec_refcount();
if (state->stream->read_state == state) {
state->stream->read_state = NULL;
@ -558,14 +566,6 @@ void janet_ev_mark(void) {
janet_mark(janet_wrap_fiber(janet_vm.tq[i].curr_fiber));
}
}
/* Listeners */
for (int32_t i = 0; i < janet_vm.listeners.capacity; i++) {
JanetKV *kv = janet_vm.listeners.data + i;
if (!janet_checktype(kv->key, JANET_NIL)) {
janet_mark(kv->key);
}
}
}
static int janet_channel_push(JanetChannel *channel, Janet x, int mode);
@ -591,9 +591,10 @@ void janet_ev_init_common(void) {
janet_vm.tq_capacity = 0;
janet_table_init_raw(&janet_vm.threaded_abstracts, 0);
janet_table_init_raw(&janet_vm.active_tasks, 0);
janet_table_init_raw(&janet_vm.listeners, 0);
janet_table_init_raw(&janet_vm.signal_handlers, 0);
janet_rng_seed(&janet_vm.ev_rng, 0);
janet_vm.listeners = janet_array(0);
janet_gcroot(janet_wrap_array(janet_vm.listeners));
#ifndef JANET_WINDOWS
pthread_attr_init(&janet_vm.new_thread_attr);
pthread_attr_setdetachstate(&janet_vm.new_thread_attr, PTHREAD_CREATE_DETACHED);
@ -606,8 +607,8 @@ void janet_ev_deinit_common(void) {
janet_free(janet_vm.tq);
janet_table_deinit(&janet_vm.threaded_abstracts);
janet_table_deinit(&janet_vm.active_tasks);
janet_table_deinit(&janet_vm.listeners);
janet_table_deinit(&janet_vm.signal_handlers);
janet_vm.listeners = NULL;
#ifndef JANET_WINDOWS
pthread_attr_destroy(&janet_vm.new_thread_attr);
#endif
@ -1596,7 +1597,6 @@ JanetListenerState *janet_listen(JanetStream *stream, JanetListener behavior, in
int is_first = !stream->read_state && !stream->write_state;
int op = is_first ? EPOLL_CTL_ADD : EPOLL_CTL_MOD;
JanetListenerState *state = janet_listen_impl(stream, behavior, mask, size, user);
state->index = 0;
struct epoll_event ev;
ev.events = 0;
if (stream->read_state) ev.events |= EPOLLIN;
@ -1614,7 +1614,7 @@ JanetListenerState *janet_listen(JanetStream *stream, JanetListener behavior, in
* event to a file. So we just post a custom event to do the read/write
* asap. */
/* Use flag to indicate state is not registered in epoll */
state->index = 1;
state->flags = 1;
JanetEVGenericMessage msg = {0};
msg.argp = state;
janet_ev_post_event(NULL, janet_epoll_sync_callback, msg);
@ -1632,7 +1632,7 @@ static void janet_unlisten(JanetListenerState *state) {
JanetStream *stream = state->stream;
if (stream && (stream->handle != -1)) {
/* Use flag to indicate state is not registered in epoll */
if (!state->index) {
if (!state->flags) {
int is_read = (stream->read_state != state) && stream->read_state;
int is_write = (stream->write_state != state) && stream->write_state;
int is_last = !is_read && !is_write;
@ -1816,37 +1816,33 @@ JanetListenerState *janet_listen(JanetStream *stream, JanetListener behavior, in
length++;
}
if (length > 0) {
add_kqueue_events(kev, length);
}
janet_assert(length, "expected to add kqueue events");
add_kqueue_events(kev, length);
return state;
}
static void janet_unlisten(JanetListenerState *state) {
JanetStream *stream = state->stream;
if (stream->handle != -1) {
/* Use flag to indicate state is not registered in kqueue */
if (!state->index) {
int is_read = (stream->read_state != state) && stream->read_state;
int is_write = (stream->write_state != state) && stream->write_state;
int is_last = !is_read && !is_write;
int op = is_last ? EV_DELETE : EV_DISABLE | EV_ADD;
struct kevent kev[2];
EV_SETx(&kev[1], stream->handle, EVFILT_WRITE, op, 0, 0, stream);
if (stream && (stream->handle != -1)) {
int is_read = (stream->read_state != state) && stream->read_state;
int is_write = (stream->write_state != state) && stream->write_state;
int is_last = !is_read && !is_write;
int op = is_last ? EV_DELETE : EV_DISABLE | EV_ADD;
struct kevent kev[2];
EV_SETx(&kev[1], stream->handle, EVFILT_WRITE, op, 0, 0, stream);
int length = 0;
if (stream->read_state == state) {
EV_SETx(&kev[length], stream->handle, EVFILT_WRITE, op, 0, 0, stream);
length++;
}
if (stream->write_state == state) {
EV_SETx(&kev[length], stream->handle, EVFILT_READ, op, 0, 0, stream);
length++;
}
add_kqueue_events(kev, length);
int length = 0;
if (stream->read_state == state) {
EV_SETx(&kev[length], stream->handle, EVFILT_WRITE, op, 0, 0, stream);
length++;
}
if (stream->write_state == state) {
EV_SETx(&kev[length], stream->handle, EVFILT_READ, op, 0, 0, stream);
length++;
}
add_kqueue_events(kev, length);
}
janet_unlisten_impl(state);
}
@ -1953,9 +1949,9 @@ static JanetTimestamp ts_now(void) {
/* Wait for the next event */
JanetListenerState *janet_listen(JanetStream *stream, JanetListener behavior, int mask, size_t size, void *user) {
size_t oldsize = janet_vm.listeners.count_cap;
size_t oldsize = janet_vm.listeners->capacity;
JanetListenerState *state = janet_listen_impl(stream, behavior, mask, size, user);
size_t newsize = janet_vm.listener_cap;
size_t newsize = janet_vm.listeners->capacity;
if (newsize > oldsize) {
janet_vm.fds = janet_realloc(janet_vm.fds, (newsize + 1) * sizeof(struct pollfd));
if (NULL == janet_vm.fds) {
@ -1965,15 +1961,17 @@ JanetListenerState *janet_listen(JanetStream *stream, JanetListener behavior, in
struct pollfd ev;
ev.fd = stream->handle;
ev.events = 0;
if (stream->read_state) events |= POLLIN;
if (stream->write_state) events |= POLLOUT;
if (stream->read_state) ev.events |= POLLIN;
if (stream->write_state) ev.events |= POLLOUT;
ev.revents = 0;
janet_vm.fds[state->_index + 1] = ev;
janet_vm.fds[state->index + 1] = ev;
return state;
}
static void janet_unlisten(JanetListenerState *state) {
janet_vm.fds[state->_index + 1] = janet_vm.fds[janet_vm.listener_count];
if (state->stream) {
janet_vm.fds[state->index + 1] = janet_vm.fds[janet_vm.listeners->count];
}
janet_unlisten_impl(state);
}
@ -1986,7 +1984,7 @@ void janet_loop1_impl(int has_timeout, JanetTimestamp timeout) {
JanetTimestamp now = ts_now();
to = now > timeout ? 0 : (int)(timeout - now);
}
ready = poll(janet_vm.fds, janet_vm.listener_count + 1, to);
ready = poll(janet_vm.fds, janet_vm.listeners->count + 1, to);
} while (ready == -1 && errno == EINTR);
if (ready == -1) {
JANET_EXIT("failed to poll events");
@ -1999,10 +1997,10 @@ void janet_loop1_impl(int has_timeout, JanetTimestamp timeout) {
}
/* Step state machines */
for (size_t i = 0; i < janet_vm.listener_count; i++) {
for (int32_t i = 0; i < janet_vm.listeners->count; i++) {
struct pollfd *pfd = janet_vm.fds + i + 1;
/* Skip fds where nothing interesting happened */
JanetListenerState *state = janet_vm.listeners[i];
JanetListenerState *state = (JanetListenerState *) janet_unwrap_abstract(janet_vm.listeners->data[i]);
/* Normal event */
int mask = pfd->revents;
JanetAsyncStatus status1 = JANET_ASYNC_STATUS_NOT_DONE;

2
src/core/state.h
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@ -158,7 +158,7 @@ struct JanetVM {
volatile size_t extra_listeners; /* used in signal handler, must be volatile */
JanetTable threaded_abstracts; /* All abstract types that can be shared between threads (used in this thread) */
JanetTable active_tasks; /* All possibly live task fibers - used just for tracking */
JanetTable listeners; /* For GC */
JanetArray *listeners; /* For GC */
JanetTable signal_handlers;
#ifdef JANET_WINDOWS
void **iocp;

4
src/include/janet.h
View File

@ -624,11 +624,11 @@ struct JanetListenerState {
JanetStream *stream;
void *event; /* Used to pass data from asynchronous IO event. Contents depend on both
implementation of the event loop and the particular event. */
uint32_t index; /* Used for GC and poll implentation */
uint32_t flags;
#ifdef JANET_WINDOWS
void *tag; /* Used to associate listeners with an overlapped structure */
int bytes; /* Used to track how many bytes were transfered. */
#else
uint32_t index; /* Used for poll/epoll implentation */
#endif
};
#endif