/
events.c
1319 lines (1079 loc) · 31.3 KB
/
events.c
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/*
Copyright (C) 2001-2003, The Perl Foundation.
$Id$
=head1 NAME
src/events.c - Event handling stuff
=head1 DESCRIPTION
An event_thread handles async events for all interpreters. When events
are due, they are placed in per interpreter task_queues, where they are
handled then by the C<check_event*> opcodes.
IO events and signals are caught in the io_thread, which again
dispatches these to one or all interpreters.
=cut
*/
#include "parrot/parrot.h"
#include <assert.h>
/*
* event debugging stuff - turn it off before running tests
*/
#define EVENT_DEBUG 0
/*
* not yet - need to sort out platform code and fix exceptions first
* TODO get some config for POSIX compliant
* TODO create API for extenders like ponie - events disabled for now
*/
#if defined(linux) || defined(darwin)
# define INSTALL_EVENT_HANDLER 0
#else
# define INSTALL_EVENT_HANDLER 0
#endif
#if EVENT_DEBUG
# define edebug(x) fprintf x
static const char *ev_names[] = {
"EVENT_TYPE_NONE",
"EVENT_TYPE_EVENT",
"EVENT_TYPE_IO",
"EVENT_TYPE_MSG",
"EVENT_TYPE_TIMER",
"EVENT_TYPE_CALL_BACK",
"EVENT_TYPE_SLEEP",
"EVENT_TYPE_TERMINATE",
"EVENT_TYPE_EVENT_TERMINATE",
"EVENT_TYPE_CLASS_CHANGED",
"EVENT_TYPE_SIGNAL",
"EVENT_TYPE_SUSPEND_FOR_GC"
};
static const char*
et(parrot_event* e)
{
return ev_names[e->type];
}
#else
# define edebug(x)
#endif
/* forward defs */
static void* event_thread(void *data);
static void* io_thread(void *data);
static void* do_event(Parrot_Interp, parrot_event*, void*);
static void stop_io_thread(void);
static void schedule_signal_event(int signum);
void Parrot_schedule_broadcast_qentry(QUEUE_ENTRY* entry);
static QUEUE_ENTRY* dup_entry(QUEUE_ENTRY* entry);
/*
* we have exactly one global event_queue
* TODO task prio handling
*/
static QUEUE* event_queue;
#define TASK_PRIO 10
/*
* user accessible signals like SIGINT
*/
#ifndef SIGINT
# define SIGINT -4711
#endif
#ifndef SIGHUP
# define SIGHUP -4712
#endif
/*
* XXX need a configure test
* should be sig_atomic_t
*/
static int sig_int, sig_hup;
/*
* a pipe is used to send messages to the IO thread
*/
static int pipe_fds[2];
#define PIPE_READ_FD pipe_fds[0]
#define PIPE_WRITE_FD pipe_fds[1]
/*
* a structure to communicate with the io_thread
*/
typedef struct {
io_thread_msg_type command;
parrot_event *ev;
} io_thread_msg;
#define MSG_SIZE (sizeof(io_thread_msg))
/*
=head2 Signal Handling
=over 4
=item C<static void sig_handler(int signum)>
Handle signal C<signum>.
TODO - Only C<SIGHUP> is handled at the moment for testing
=cut
*/
static void
sig_handler(int signum)
{
switch (signum) {
case SIGINT:
sig_int = 1;
break;
case SIGHUP:
sig_hup = 1;
break;
}
}
#if PARROT_HAS_SIGACTION
/*
=item C<static void
Parrot_sigaction(int sig, void (*handler)(int))>
Signal handlers are common to all threads, signal block masks are
specific, so we install one handler then block that signal and unblock
it in the thread, that will receive that signal.
=cut
*/
static void
Parrot_sigaction(int sig, void (*handler)(int))
{
struct sigaction action;
sigset_t block_mask;
/* install handler */
action.sa_handler = handler;
sigemptyset(&action.sa_mask);
action.sa_flags = 0;
sigaction(sig, &action, NULL);
/* block that signal */
sigemptyset(&block_mask);
sigaddset(&block_mask, sig);
sigprocmask(SIG_BLOCK, &block_mask, NULL);
}
/*
* unblock a signal
*/
static void
Parrot_unblock_signal(int sig)
{
sigset_t block_mask;
sigemptyset(&block_mask);
sigaddset(&block_mask, sig);
sigprocmask(SIG_UNBLOCK, &block_mask, NULL);
}
#else
static void
Parrot_sigaction(int sig, void (*handler)(int))
{
}
static void
Parrot_unblock_signal(int sig)
{
}
#endif
void
Parrot_init_signals(void)
{
/*
* SIGFPE is architecture specific - some signal an error,
* some don't, so we have to use direct checks if we are dividing
* by zero.
*/
Parrot_sigaction(SIGHUP, sig_handler);
}
/*
=back
=head2 Initialization
=over 4
=item C<static void init_events_first(Parrot_Interp interpreter)>
Init event system for first interpreter.
=cut
*/
static void
init_events_first(Parrot_Interp interpreter)
{
Parrot_thread ev_handle;
#ifndef WIN32
Parrot_thread io_handle;
#endif
/*
* be sure all init is done only once
* we could use pthread_once for that too
*/
if (event_queue)
PANIC("event queue already exists - missing parent_interp?");
/*
* create event queue
*/
event_queue = queue_init(TASK_PRIO);
/*
* we use a message pipe to send IO related stuff to the
* IO thread
*/
#ifndef WIN32
/*
* pipes on WIN32 don't support select
* s. p6i: "event.c - of signals and pipes"
*/
if (pipe(pipe_fds))
internal_exception(1, "Couldn't create message pipe");
#endif
/*
* now set some sig handlers before any thread is started, so
* that all threads inherit the signal block mask
*/
#if INSTALL_EVENT_HANDLER
Parrot_init_signals();
#endif
/*
* we start an event_handler thread
*/
THREAD_CREATE_DETACHED(ev_handle, event_thread, event_queue);
/*
* and a signal and IO handler thread
*/
#ifndef WIN32
THREAD_CREATE_DETACHED(io_handle, io_thread, event_queue);
#endif
}
/*
=item C<static void init_events_all(Parrot_Interp interpreter)>
Init events for all interpreters.
=cut
*/
static void
init_events_all(Parrot_Interp interpreter)
{
/*
* create per interpreter task queue
*/
interpreter->task_queue = queue_init(0);
}
/*
=item C<void Parrot_init_events(Parrot_Interp interpreter)>
Initialize the event system.
=cut
*/
void
Parrot_init_events(Parrot_Interp interpreter)
{
if (!interpreter->parent_interpreter) {
/* add the very first interpreter to the list of interps. */
pt_add_to_interpreters(interpreter, NULL);
init_events_first(interpreter);
}
init_events_all(interpreter);
}
/*
=back
=head2 Event Handler Functions
=over 4
=item C<code>
Create queue entry and insert event into task queue.
=cut
*/
void
Parrot_schedule_event(Parrot_Interp interpreter, parrot_event* ev)
{
QUEUE_ENTRY* entry = mem_sys_allocate(sizeof(QUEUE_ENTRY));
entry->next = NULL;
ev->interp = interpreter;
entry->data = ev;
switch (ev->type) {
case EVENT_TYPE_TIMER:
case EVENT_TYPE_SLEEP:
entry->type = QUEUE_ENTRY_TYPE_TIMED_EVENT;
insert_entry(event_queue, entry);
break;
case EVENT_TYPE_CALL_BACK:
case EVENT_TYPE_SIGNAL:
case EVENT_TYPE_IO:
entry->type = QUEUE_ENTRY_TYPE_EVENT;
unshift_entry(event_queue, entry);
break;
default:
entry->type = QUEUE_ENTRY_TYPE_EVENT;
push_entry(event_queue, entry);
break;
}
}
/*
* create and schedule a signal event
*/
static void
schedule_signal_event(int signum)
{
parrot_event* ev = mem_sys_allocate(sizeof(parrot_event));
QUEUE_ENTRY *entry;
entry = mem_sys_allocate(sizeof(QUEUE_ENTRY));
entry->next = NULL;
entry->type = QUEUE_ENTRY_TYPE_EVENT;
ev->type = EVENT_TYPE_SIGNAL;
ev->u.signal = signum;
entry->data = ev;
/*
* deliver to all interpreters
*/
Parrot_schedule_broadcast_qentry(entry);
}
/*
=item C<void
Parrot_new_timer_event(Parrot_Interp interpreter, PMC* timer, FLOATVAL diff,
FLOATVAL interval, int repeat, PMC* sub, parrot_event_type_enum typ)>
Create a new timer event due at C<diff> from now, repeated at C<interval>
and running the passed C<sub>.
=cut
*/
void
Parrot_new_timer_event(Parrot_Interp interpreter, PMC* timer, FLOATVAL diff,
FLOATVAL interval, int repeat, PMC* sub, parrot_event_type_enum typ)
{
parrot_event* ev = mem_sys_allocate(sizeof(parrot_event));
FLOATVAL now = Parrot_floatval_time();
ev->type = typ;
ev->u.timer_event.timer = timer;
ev->u.timer_event.abs_time = now + diff;
ev->u.timer_event.interval = interval;
ev->u.timer_event.repeat = repeat;
if (repeat && !interval)
ev->u.timer_event.interval = diff;
ev->u.timer_event.sub = sub;
Parrot_schedule_event(interpreter, ev);
}
/*
=item C<void
Parrot_new_cb_event(Parrot_Interp, PMC*cbi, void*ext)>
Prepare and schedule a callback event.
=cut
*/
void
Parrot_new_cb_event(Parrot_Interp interpreter, PMC* cbi, void* ext)
{
parrot_event* ev = mem_sys_allocate(sizeof(parrot_event));
QUEUE_ENTRY* entry = mem_sys_allocate(sizeof(QUEUE_ENTRY));
entry->next = NULL;
entry->data = ev;
ev->interp = interpreter;
ev->type = EVENT_TYPE_CALL_BACK;
ev->u.call_back.cbi = cbi;
ev->u.call_back.external_data = ext;
Parrot_schedule_interp_qentry(interpreter, entry);
}
/*
=item C<void
Parrot_del_timer_event(Parrot_Interp interpreter, PMC* timer)>
Deactivate the timer identified by C<timer>.
=cut
*/
void
Parrot_del_timer_event(Parrot_Interp interpreter, PMC* timer)
{
QUEUE_ENTRY *entry;
parrot_event* event;
LOCK(event_queue->queue_mutex);
for (entry = event_queue->head; entry; entry = entry->next) {
if (entry->type == QUEUE_ENTRY_TYPE_TIMED_EVENT) {
event = entry->data;
if (event->interp == interpreter
&& event->u.timer_event.timer == timer) {
event->u.timer_event.interval = 0.0;
event->type = EVENT_TYPE_NONE;
break;
}
}
}
UNLOCK(event_queue->queue_mutex);
}
/*
=item C<void Parrot_new_terminate_event(Parrot_Interp interpreter)>
Create a terminate event, interpreter will leave the run-loop when this
event arrives.
=cut
*/
void
Parrot_new_terminate_event(Parrot_Interp interpreter)
{
parrot_event* ev = mem_sys_allocate(sizeof(parrot_event));
ev->type = EVENT_TYPE_TERMINATE;
Parrot_schedule_event(interpreter, ev);
}
/*
=item C<void Parrot_new_suspend_for_gc_event(Parrot_Interp interpreter)>
Create a suspend-for-GC event, interpreter will wait on a condition
variable for GC to finish when the event arrives.
=cut
*/
void
Parrot_new_suspend_for_gc_event(Parrot_Interp interpreter) {
QUEUE_ENTRY *qe;
parrot_event* ev = mem_sys_allocate(sizeof(parrot_event));
ev->type = EVENT_TYPE_SUSPEND_FOR_GC;
qe = mem_sys_allocate(sizeof(QUEUE_ENTRY));
qe->next = NULL;
qe->data = ev;
qe->type = QUEUE_ENTRY_TYPE_EVENT;
/* we don't use schedule_event because we must modify its
* task queue immediately
*/
Parrot_schedule_interp_qentry(interpreter, qe);
}
/*
=item C<void Parrot_kill_event_loop(void)>
Schedule event-loop terminate event. This shuts down the event thread.
=cut
*/
void
Parrot_kill_event_loop(void)
{
parrot_event* ev = mem_sys_allocate(sizeof(parrot_event));
ev->type = EVENT_TYPE_EVENT_TERMINATE;
Parrot_schedule_event(NULL, ev);
}
/*
=item C<void
Parrot_schedule_interp_qentry(Parrot_Interp interpreter, QUEUE_ENTRY* entry)>
Put a queue entry into the interpreters task queue and enable event
checking for the interpreter.
=cut
*/
void
Parrot_schedule_interp_qentry(Parrot_Interp interpreter, QUEUE_ENTRY* entry)
{
parrot_event* event;
event = entry->data;
/*
* sleep checks events when it awakes
*/
edebug((stderr, "got entry - schedule_inter_qentry %s\n", et(event)));
if (event->type != EVENT_TYPE_SLEEP)
enable_event_checking(interpreter);
/*
* do push_entry last - this signales the queue condition so the
* interpreter might starting process that event immediately
*
* we should better use a priority for placing the event
* in front or at the end of the queue
*/
switch (event->type) {
case EVENT_TYPE_CALL_BACK:
case EVENT_TYPE_SIGNAL:
unshift_entry(interpreter->task_queue, entry);
break;
default:
push_entry(interpreter->task_queue, entry);
break;
}
}
/*
=item C<void
Parrot_schedule_broadcast_qentry(QUEUE_ENTRY* entry)>
Broadcast an event.
=cut
*/
void
Parrot_schedule_broadcast_qentry(QUEUE_ENTRY* entry)
{
Parrot_Interp interp;
parrot_event* event;
size_t i;
event = entry->data;
switch (event->type) {
case EVENT_TYPE_SIGNAL:
edebug((stderr, "broadcast signal\n"));
/*
* we don't have special signal handlers in usercode yet
* e.g.:
* install handler like exception handler *and*
* set a interpreter flag, that a handler exists
* we then could examine that flag (after LOCKing it)
* and dispatch the exception to all interpreters that
* handle it
* Finally, we send the first (main) interpreter that signal
*
* For now just send to all.
*
*/
switch(event->u.signal) {
case SIGHUP:
case SIGINT:
if (n_interpreters) {
LOCK(interpreter_array_mutex);
for (i = 1; i < n_interpreters; ++i) {
edebug((stderr, "deliver SIGINT to %d\n", i));
interp = interpreter_array[i];
if (interp)
Parrot_schedule_interp_qentry(interp,
dup_entry(entry));
}
UNLOCK(interpreter_array_mutex);
}
interp = interpreter_array[0];
Parrot_schedule_interp_qentry(interp, entry);
edebug((stderr, "deliver SIGINT to 0\n"));
break;
default:
mem_sys_free(entry);
mem_sys_free(event);
}
break;
default:
mem_sys_free(entry);
mem_sys_free(event);
internal_exception(1, "Unknown event to broadcast");
break;
}
}
/*
=back
=head2 IO Thread Handling
=over 4
=item C<static void*
io_thread(void *data)>
The IO thread uses select/poll to handle IO events and signals.
It waits on input from the message pipe to insert file descriptors in
the wait sets.
=cut
*/
#ifndef WIN32
typedef struct {
int n;
int alloced;
parrot_event **events;
} pending_io_events;
static void
store_io_event(pending_io_events *ios, parrot_event *ev)
{
if (!ios->alloced) {
ios->events = mem_sys_allocate(16 * sizeof(ev));
ios->alloced = 16;
}
else if (ios->n == ios->alloced - 1) {
ios->alloced <<= 1;
ios->events = mem_sys_realloc(ios->events, (ios->alloced * sizeof(ev)));
}
ios->events[ios->n++] = ev;
}
static void
io_thread_ready_rd(pending_io_events *ios, int ready_rd)
{
int i;
for (i = 0; i < ios->n; ++i) {
parrot_event * const ev = ios->events[i];
PMC * const pio = ev->u.io_event.pio;
const int fd = PIO_getfd(NULL, pio);
if (fd == ready_rd) {
/* remove from event list */
--ios->n;
for (; i < ios->n; ++i)
ios->events[i] = ios->events[i+1];
Parrot_schedule_event(ev->interp, ev);
break;
}
}
}
static void*
io_thread(void *data)
{
QUEUE* event_q = (QUEUE*) data;
fd_set rfds, wfds, act_rfds, act_wfds;
int n_highest, i;
int running = 1;
pending_io_events ios;
ios.n = 0;
ios.alloced = 0;
/* remember pending io events */
FD_ZERO(&act_rfds);
FD_ZERO(&act_wfds);
UNUSED(event_q);
/*
* Watch the reader end of the pipe for messages
*/
FD_SET(PIPE_READ_FD, &act_rfds);
n_highest = PIPE_READ_FD + 1;
/*
* all signals that we shall handle here have to be unblocked
* in this and only in this thread
*/
Parrot_unblock_signal(SIGHUP);
while (running) {
int retval;
rfds = act_rfds;
wfds = act_wfds;
retval = select(n_highest, &rfds, &wfds, NULL, NULL);
switch (retval) {
case -1:
if (errno == EINTR) {
edebug((stderr, "select EINTR\n"));
if (sig_int) {
edebug((stderr, "int arrived\n"));
sig_int = 0;
/*
* signal the event thread
*/
schedule_signal_event(SIGINT);
}
if (sig_hup) {
edebug((stderr, "int arrived\n"));
sig_hup = 0;
/*
* signal the event thread
*/
schedule_signal_event(SIGHUP);
}
}
break;
case 0: /* timeout - can't happen */
break;
default:
edebug((stderr, "IO ready\n"));
for (i = 0; i < n_highest; ++i) {
if (FD_ISSET(i, &rfds)) {
if (i == PIPE_READ_FD) {
io_thread_msg buf;
/*
* a command arrived
*/
edebug((stderr, "msg arrived\n"));
if (read(PIPE_READ_FD, &buf, MSG_SIZE) != MSG_SIZE)
internal_exception(1,
"read error from msg pipe");
switch (buf.command) {
case IO_THR_MSG_TERMINATE:
running = 0;
break;
case IO_THR_MSG_ADD_SELECT_RD:
{
PMC *pio = buf.ev->u.io_event.pio;
int fd = PIO_getfd(NULL, pio);
if (FD_ISSET(fd, &act_rfds)) {
mem_sys_free(buf.ev);
break;
}
FD_SET(fd, &act_rfds);
if (fd >= n_highest)
n_highest = fd + 1;
store_io_event(&ios, buf.ev);
}
break;
/* TODO */
default:
internal_exception(1,
"unhandled msg in pipe");
break;
}
}
else {
/*
* one of the io_event fds is ready
* remove from active set, as we don't
* want to fire again during io_handler
* invocation
*/
FD_CLR(i, &act_rfds);
io_thread_ready_rd(&ios, i);
}
}
}
/* TODO check fds */
break;
}
}
edebug((stderr, "IO thread terminated\n"));
close(PIPE_READ_FD);
close(PIPE_WRITE_FD);
return NULL;
}
#endif
/*
=item C<static void
stop_io_thread(void)>
Tell the IO thread to stop.
=cut
*/
static void
stop_io_thread(void)
{
io_thread_msg buf;
/*
* tell IO thread to stop
*/
buf.command = IO_THR_MSG_TERMINATE;
#ifndef WIN32
if (write(PIPE_WRITE_FD, &buf, MSG_SIZE) != MSG_SIZE)
internal_exception(1, "msg pipe write failed");
#endif
}
void
Parrot_event_add_io_event(Interp* interpreter,
PMC* pio, PMC* sub, PMC* data, INTVAL which)
{
parrot_event *event;
io_thread_msg buf;
event = mem_sys_allocate(sizeof(parrot_event));
event->type = EVENT_TYPE_IO;
event->interp = interpreter;
/*
* TODO dod_register these PMCs as long as the event system
* owns these 3
* unregister, when event is passed to interp again
*/
event->u.io_event.pio = pio;
event->u.io_event.handler = sub;
event->u.io_event.user_data = data;
buf.command = which;
buf.ev = event;
#ifndef WIN32
if (write(PIPE_WRITE_FD, &buf, MSG_SIZE) != MSG_SIZE)
internal_exception(1, "msg pipe write failed");
#endif
}
/*
=back
=head2 Event Handler Thread Functions
=over 4
=item C<static QUEUE_ENTRY*
dup_entry(QUEUE_ENTRY* entry)>
Duplicate queue entry.
=cut
*/
static QUEUE_ENTRY*
dup_entry(QUEUE_ENTRY* entry)
{
parrot_event *event;
QUEUE_ENTRY *new_entry;
new_entry = mem_sys_allocate(sizeof(QUEUE_ENTRY));
new_entry->next = NULL;
new_entry->type = entry->type;
event = new_entry->data = mem_sys_allocate(sizeof(parrot_event));
mem_sys_memcopy(event, entry->data, sizeof(parrot_event));
return new_entry;
}
/*
=item C<static QUEUE_ENTRY*
dup_entry_interval(QUEUE_ENTRY* entry, FLOATVAL now)>
Duplicate timed entry and add interval to C<abs_time>.
=cut
*/
static QUEUE_ENTRY*
dup_entry_interval(QUEUE_ENTRY* entry, FLOATVAL now)
{
parrot_event *event;
QUEUE_ENTRY *new_entry = dup_entry(entry);
event = new_entry->data;
event->u.timer_event.abs_time = now + event->u.timer_event.interval;
return new_entry;
}
/*
=item C<static int process_events(QUEUE* event_q)>
Do something, when an event arrived caller has locked the mutex returns
0 if event thread terminates.
=cut
*/
static int
process_events(QUEUE* event_q)
{
FLOATVAL now;
QUEUE_ENTRY *entry;
parrot_event* event;
while (( entry = peek_entry(event_q))) {
/*
* one or more entries arrived - we hold the mutex again
* so we have to use the nonsyc_pop_entry to pop off event entries
*/
event = NULL;
switch (entry->type) {
case QUEUE_ENTRY_TYPE_EVENT:
entry = nosync_pop_entry(event_q);
event = entry->data;
break;
case QUEUE_ENTRY_TYPE_TIMED_EVENT:
event = entry->data;
now = Parrot_floatval_time();
/*
* if the timer_event isn't due yet, ignore the event
* (we were signalled on insert of the event)
* wait until we get at it again when time has elapsed
*/
if (now < event->u.timer_event.abs_time)
return 1;
entry = nosync_pop_entry(event_q);
/*
* if event is repeated dup and reinsert it
*/
if (event->u.timer_event.interval) {
if (event->u.timer_event.repeat) {
if (event->u.timer_event.repeat != -1)
event->u.timer_event.repeat--;
nosync_insert_entry(event_q,
dup_entry_interval(entry, now));
}
}
break;
default:
internal_exception(1, "Unknown queue entry");
}
assert(event);
if (event->type == EVENT_TYPE_NONE) {
mem_sys_free(entry);
mem_sys_free(event);
continue;
}
else if (event->type == EVENT_TYPE_EVENT_TERMINATE) {
mem_sys_free(entry);
mem_sys_free(event);
return 0;
}
/*
* now insert entry in interpreter task queue
*/
if (event->interp) {
Parrot_schedule_interp_qentry(event->interp, entry);
}
else {
Parrot_schedule_broadcast_qentry(entry);
}
} /* while events */