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scheduler.c
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scheduler.c
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/*
Copyright (C) 2007-2010, Parrot Foundation.
=head1 NAME
src/scheduler.c - The core routines for the concurrency scheduler
=head1 DESCRIPTION
Each interpreter has a concurrency scheduler element in its core struct. The
scheduler is responsible for receiving, dispatching, and monitoring events,
exceptions, async I/O, and concurrent tasks (threads).
=cut
*/
#include "parrot/parrot.h"
#include "parrot/extend.h"
#include "parrot/scheduler_private.h"
#include "parrot/runcore_api.h"
#include "pmc/pmc_scheduler.h"
#include "pmc/pmc_task.h"
#include "pmc/pmc_timer.h"
#include "scheduler.str"
#define CX_DEBUG 0
/* HEADERIZER HFILE: include/parrot/scheduler.h */
/* HEADERIZER BEGIN: static */
/* Don't modify between HEADERIZER BEGIN / HEADERIZER END. Your changes will be lost. */
static void scheduler_process_messages(PARROT_INTERP,
ARGMOD(PMC *scheduler))
__attribute__nonnull__(1)
__attribute__nonnull__(2)
FUNC_MODIFIES(*scheduler);
static void scheduler_process_wait_list(PARROT_INTERP,
ARGMOD(PMC *scheduler))
__attribute__nonnull__(1)
__attribute__nonnull__(2)
FUNC_MODIFIES(*scheduler);
#define ASSERT_ARGS_scheduler_process_messages __attribute__unused__ int _ASSERT_ARGS_CHECK = (\
PARROT_ASSERT_ARG(interp) \
, PARROT_ASSERT_ARG(scheduler))
#define ASSERT_ARGS_scheduler_process_wait_list __attribute__unused__ int _ASSERT_ARGS_CHECK = (\
PARROT_ASSERT_ARG(interp) \
, PARROT_ASSERT_ARG(scheduler))
/* Don't modify between HEADERIZER BEGIN / HEADERIZER END. Your changes will be lost. */
/* HEADERIZER END: static */
/*
=head2 Scheduler Interface Functions
Functions to interface with the concurrency scheduler.
=over 4
=item C<void Parrot_cx_init_scheduler(PARROT_INTERP)>
Initialize the concurrency scheduler for the interpreter.
=cut
*/
void
Parrot_cx_init_scheduler(PARROT_INTERP)
{
ASSERT_ARGS(Parrot_cx_init_scheduler)
if (!interp->parent_interpreter) {
PMC *scheduler;
/* Add the very first interpreter to the list of interps. */
pt_add_to_interpreters(interp, NULL);
scheduler = Parrot_pmc_new(interp, enum_class_Scheduler);
scheduler = VTABLE_share_ro(interp, scheduler);
interp->scheduler = scheduler;
}
}
/*
=item C<void Parrot_cx_check_tasks(PARROT_INTERP, PMC *scheduler)>
If a wake request has been received, handle tasks.
=cut
*/
void
Parrot_cx_check_tasks(PARROT_INTERP, ARGMOD(PMC *scheduler))
{
ASSERT_ARGS(Parrot_cx_check_tasks)
if (SCHEDULER_wake_requested_TEST(scheduler))
Parrot_cx_handle_tasks(interp, interp->scheduler);
}
/*
=item C<void Parrot_cx_handle_tasks(PARROT_INTERP, PMC *scheduler)>
Handle the pending tasks in the scheduler's task list. Returns when there are
no more pending tasks.
=cut
*/
PARROT_EXPORT
void
Parrot_cx_handle_tasks(PARROT_INTERP, ARGMOD(PMC *scheduler))
{
ASSERT_ARGS(Parrot_cx_handle_tasks)
/* avoid recursive calls */
if (SCHEDULER_in_handler_TEST(scheduler))
return;
SCHEDULER_in_handler_SET(scheduler);
SCHEDULER_wake_requested_CLEAR(scheduler);
Parrot_cx_refresh_task_list(interp, scheduler);
while (VTABLE_get_integer(interp, scheduler) > 0) {
PMC * const task = VTABLE_pop_pmc(interp, scheduler);
if (!PMC_IS_NULL(task)) {
PMC * const type_pmc = VTABLE_get_attr_str(interp, task, CONST_STRING(interp, "type"));
STRING * const type = VTABLE_get_string(interp, type_pmc);
if (STRING_equal(interp, type, CONST_STRING(interp, "callback"))) {
Parrot_cx_invoke_callback(interp, task);
}
else if (STRING_equal(interp, type, CONST_STRING(interp, "timer"))) {
Parrot_cx_timer_invoke(interp, task);
}
else if (STRING_equal(interp, type, CONST_STRING(interp, "event"))) {
PMC * const handler = Parrot_cx_find_handler_for_task(interp, task);
if (!PMC_IS_NULL(handler)) {
PMC * const handler_sub = VTABLE_get_attr_str(interp, handler, CONST_STRING(interp, "code"));
Parrot_ext_call(interp, handler_sub, "PP->", handler, task);
}
}
else {
Parrot_ex_throw_from_c_args(interp, NULL, EXCEPTION_INVALID_OPERATION,
"Unknown task type '%Ss'.\n", type);
}
Parrot_cx_delete_task(interp, task);
}
/* If the scheduler was flagged to terminate, make sure you process all
* tasks. */
if (SCHEDULER_terminate_requested_TEST(scheduler))
Parrot_cx_refresh_task_list(interp, scheduler);
} /* end of pending tasks */
SCHEDULER_in_handler_CLEAR(scheduler);
}
/*
=item C<void Parrot_cx_refresh_task_list(PARROT_INTERP, PMC *scheduler)>
Tell the scheduler to perform maintenance on its list of active tasks, checking
for completed timers or sleep events, sorting for priority, checking for
messages, etc.
=cut
*/
void
Parrot_cx_refresh_task_list(PARROT_INTERP, ARGMOD(PMC *scheduler))
{
ASSERT_ARGS(Parrot_cx_refresh_task_list)
scheduler_process_wait_list(interp, scheduler);
scheduler_process_messages(interp, scheduler);
/* TODO: Sort the task list index */
SCHEDULER_cache_valid_SET(scheduler);
return;
}
/*
=item C<void Parrot_cx_runloop_wake(PARROT_INTERP, PMC *scheduler)>
Wake a sleeping scheduler runloop (generally called when new tasks are added to
the scheduler's task list).
=cut
*/
void
Parrot_cx_runloop_wake(PARROT_INTERP, ARGMOD(PMC *scheduler))
{
ASSERT_ARGS(Parrot_cx_runloop_wake)
enable_event_checking(interp);
SCHEDULER_wake_requested_SET(scheduler);
}
/*
=item C<void Parrot_cx_runloop_end(PARROT_INTERP)>
Schedule an event to terminate the scheduler runloop.
=cut
*/
PARROT_EXPORT
void
Parrot_cx_runloop_end(PARROT_INTERP)
{
ASSERT_ARGS(Parrot_cx_runloop_end)
SCHEDULER_terminate_requested_SET(interp->scheduler);
Parrot_cx_handle_tasks(interp, interp->scheduler);
}
/*
=item C<void Parrot_cx_schedule_task(PARROT_INTERP, PMC *task)>
Add a task to scheduler's task list. Cannot be called across
interpreters/threads, must be called from within the interpreter's runloop.
=cut
*/
PARROT_EXPORT
void
Parrot_cx_schedule_task(PARROT_INTERP, ARGIN(PMC *task))
{
ASSERT_ARGS(Parrot_cx_schedule_task)
if (!interp->scheduler)
Parrot_ex_throw_from_c_args(interp, NULL, EXCEPTION_INVALID_OPERATION,
"Scheduler was not initialized for this interpreter.\n");
VTABLE_push_pmc(interp, interp->scheduler, task);
}
/*
=item C<PMC * Parrot_cx_peek_task(PARROT_INTERP)>
Retrieve the the top task on the scheduler's task list, but don't remove it
from the list.
=cut
*/
PARROT_EXPORT
PARROT_CAN_RETURN_NULL
PMC *
Parrot_cx_peek_task(PARROT_INTERP)
{
ASSERT_ARGS(Parrot_cx_peek_task)
if (!interp->scheduler)
Parrot_ex_throw_from_c_args(interp, NULL, EXCEPTION_INVALID_OPERATION,
"Scheduler was not initialized for this interpreter.\n");
return VTABLE_pop_pmc(interp, interp->scheduler);
}
/*
=item C<void Parrot_cx_schedule_timer(PARROT_INTERP, STRING *type, FLOATVAL
duration, FLOATVAL interval, INTVAL repeat, PMC *sub)>
Create a new timer event due at C<diff> from now, repeated at C<interval>
and running the passed C<sub>.
=cut
*/
PARROT_EXPORT
void
Parrot_cx_schedule_timer(PARROT_INTERP,
ARGIN_NULLOK(STRING *type), FLOATVAL duration, FLOATVAL interval,
INTVAL repeat, ARGIN_NULLOK(PMC *sub))
{
ASSERT_ARGS(Parrot_cx_schedule_timer)
PMC * const timer = Parrot_pmc_new(interp, enum_class_Timer);
VTABLE_set_number_keyed_int(interp, timer, PARROT_TIMER_NSEC, duration);
VTABLE_set_number_keyed_int(interp, timer, PARROT_TIMER_INTERVAL, interval);
VTABLE_set_integer_keyed_int(interp, timer, PARROT_TIMER_REPEAT, repeat);
if (!PMC_IS_NULL(sub))
VTABLE_set_pmc_keyed_int(interp, timer, PARROT_TIMER_HANDLER, sub);
if (!STRING_IS_NULL(type))
VTABLE_set_string_native(interp, timer, type);
if (repeat && FLOAT_IS_ZERO(interval))
VTABLE_set_number_keyed_int(interp, timer, PARROT_TIMER_INTERVAL, duration);
Parrot_cx_schedule_task(interp, timer);
}
/*
=item C<void Parrot_cx_schedule_repeat(PARROT_INTERP, PMC *task)>
Add a repeat task to scheduler's task list.
=cut
*/
PARROT_EXPORT
void
Parrot_cx_schedule_repeat(PARROT_INTERP, ARGIN(PMC *task))
{
ASSERT_ARGS(Parrot_cx_schedule_repeat)
INTVAL repeat = VTABLE_get_integer_keyed_int(interp, task,
PARROT_TIMER_REPEAT);
FLOATVAL duration = VTABLE_get_number_keyed_int(interp, task,
PARROT_TIMER_INTERVAL);
if (repeat != 0) {
PMC * const repeat_task = VTABLE_clone(interp, task);
VTABLE_set_number_keyed_int(interp, repeat_task, PARROT_TIMER_NSEC, duration);
if (repeat > 0)
VTABLE_set_integer_keyed_int(interp, repeat_task,
PARROT_TIMER_REPEAT, repeat - 1);
Parrot_cx_schedule_task(interp, repeat_task);
}
}
/*
=item C<void Parrot_cx_schedule_callback(PARROT_INTERP, PMC *user_data, char
*ext_data)>
Create a new callback event, with an argument for the call.
=cut
*/
PARROT_EXPORT
void
Parrot_cx_schedule_callback(PARROT_INTERP,
ARGIN(PMC *user_data), ARGIN(char *ext_data))
{
ASSERT_ARGS(Parrot_cx_schedule_callback)
PMC * const callback = Parrot_pmc_new(interp, enum_class_Task);
Parrot_Task_attributes * const task_struct = PARROT_TASK(callback);
task_struct->type = CONST_STRING(interp, "callback");
task_struct->data = user_data;
task_struct->cb_data = ext_data;
Parrot_cx_schedule_task(interp, callback);
}
/*
=item C<void Parrot_cx_request_suspend_for_gc(PARROT_INTERP)>
Tell the scheduler to suspend for GC at the next safe pause.
=cut
*/
PARROT_EXPORT
void
Parrot_cx_request_suspend_for_gc(PARROT_INTERP)
{
ASSERT_ARGS(Parrot_cx_request_suspend_for_gc)
#if CX_DEBUG
fprintf(stderr, "requesting gc suspend [interp=%p]\n", interp);
#endif
Parrot_cx_send_message(interp, CONST_STRING(interp, "suspend_for_gc"), PMCNULL);
}
/*
=item C<void Parrot_cx_delete_task(PARROT_INTERP, PMC *task)>
Remove a task from the scheduler's task list.
=cut
*/
PARROT_EXPORT
void
Parrot_cx_delete_task(PARROT_INTERP, ARGIN(PMC *task))
{
ASSERT_ARGS(Parrot_cx_delete_task)
if (interp->scheduler) {
const INTVAL tid = VTABLE_get_integer(interp, task);
VTABLE_delete_keyed_int(interp, interp->scheduler, tid);
}
else if (interp->scheduler)
Parrot_ex_throw_from_c_args(interp, NULL, EXCEPTION_INVALID_OPERATION,
"Scheduler was not initialized for this interpreter.\n");
}
/*
=item C<PMC * Parrot_cx_delete_suspend_for_gc(PARROT_INTERP)>
Remove a message that would suspend GC from the message queue. (Provided for
backward compatibility in the threads implementation.)
=cut
*/
PARROT_EXPORT
PARROT_CAN_RETURN_NULL
PMC *
Parrot_cx_delete_suspend_for_gc(PARROT_INTERP)
{
ASSERT_ARGS(Parrot_cx_delete_suspend_for_gc)
if (interp->scheduler) {
STRING *suspend_str = CONST_STRING(interp, "suspend_for_gc");
Parrot_Scheduler_attributes * sched_struct = PARROT_SCHEDULER(interp->scheduler);
INTVAL num_tasks, index;
#if CX_DEBUG
fprintf(stderr, "called delete_suspend_for_gc\n");
#endif
#if CX_DEBUG
fprintf(stderr, "locking msg_lock (delete) [interp=%p]\n", interp);
#endif
LOCK(sched_struct->msg_lock);
/* Search the task index for GC suspend tasks */
num_tasks = VTABLE_elements(interp, sched_struct->messages);
for (index = 0; index < num_tasks; ++index) {
PMC *message = VTABLE_get_pmc_keyed_int(interp, sched_struct->messages, index);
if (!PMC_IS_NULL(message)
&& STRING_equal(interp, VTABLE_get_string(interp, message),
suspend_str)) {
VTABLE_delete_keyed_int(interp, sched_struct->messages, index);
UNLOCK(sched_struct->msg_lock);
return message;
}
}
#if CX_DEBUG
fprintf(stderr, "unlocking msg_lock (delete) [interp=%p]\n", interp);
#endif
UNLOCK(sched_struct->msg_lock);
}
else
Parrot_ex_throw_from_c_args(interp, NULL, EXCEPTION_INVALID_OPERATION,
"Scheduler was not initialized for this interpreter.\n");
return PMCNULL;
}
/*
=item C<void Parrot_cx_add_handler_local(PARROT_INTERP, PMC *handler)>
Add a handler to the current context's list of handlers.
=cut
*/
PARROT_EXPORT
void
Parrot_cx_add_handler_local(PARROT_INTERP, ARGIN(PMC *handler))
{
ASSERT_ARGS(Parrot_cx_add_handler_local)
PMC *handlers = Parrot_pcc_get_handlers(interp, interp->ctx);
if (PMC_IS_NULL(handlers)) {
handlers = Parrot_pmc_new(interp, enum_class_ResizablePMCArray);
Parrot_pcc_set_handlers(interp, interp->ctx, handlers);
}
VTABLE_unshift_pmc(interp, handlers, handler);
}
/*
=item C<void Parrot_cx_delete_handler_local(PARROT_INTERP, STRING
*handler_type)>
Remove the top task handler of a particular type from the context's list of
handlers.
=cut
*/
PARROT_EXPORT
void
Parrot_cx_delete_handler_local(PARROT_INTERP, ARGIN_NULLOK(STRING *handler_type))
{
ASSERT_ARGS(Parrot_cx_delete_handler_local)
PMC *handlers = Parrot_pcc_get_handlers(interp, interp->ctx);
if (PMC_IS_NULL(handlers))
Parrot_ex_throw_from_c_args(interp, NULL, EXCEPTION_INVALID_OPERATION,
"No handler to delete.");
if (STRING_IS_NULL(handler_type) || STRING_IS_EMPTY(handler_type))
VTABLE_shift_pmc(interp, handlers);
else {
/* Loop from newest handler to oldest handler. */
STRING *exception_str = CONST_STRING(interp, "exception");
STRING *event_str = CONST_STRING(interp, "event");
STRING *handler_str = CONST_STRING(interp, "ExceptionHandler");
const INTVAL elements = VTABLE_elements(interp, handlers);
INTVAL index;
typedef enum { Hunknown, Hexception, Hevent } Htype;
const Htype htype =
STRING_equal(interp, handler_type, exception_str) ?
Hexception :
STRING_equal(interp, handler_type, event_str) ?
Hevent :
Hunknown;
STRING * const handler_name = (htype == Hexception) ? handler_str : (STRING *)NULL;
for (index = 0; index < elements; ++index) {
PMC * const handler = VTABLE_get_pmc_keyed_int(interp, handlers, index);
if (!PMC_IS_NULL(handler)) {
switch (htype) {
case Hexception:
if (VTABLE_isa(interp, handler, handler_name)) {
VTABLE_set_pmc_keyed_int(interp, handlers, index, PMCNULL);
return;
}
break;
case Hevent:
if (handler->vtable->base_type == enum_class_EventHandler) {
VTABLE_set_pmc_keyed_int(interp, handlers, index, PMCNULL);
return;
}
break;
default:
break;
}
}
}
Parrot_ex_throw_from_c_args(interp, NULL,
EXCEPTION_INVALID_OPERATION, "No handler to delete.");
}
}
/*
=item C<INTVAL Parrot_cx_count_handlers_local(PARROT_INTERP, STRING
*handler_type)>
Count the number of active handlers of a particular type from the
context's list of handlers.
=cut
*/
PARROT_EXPORT
INTVAL
Parrot_cx_count_handlers_local(PARROT_INTERP, ARGIN(STRING *handler_type))
{
ASSERT_ARGS(Parrot_cx_count_handlers_local)
PMC * const handlers = Parrot_pcc_get_handlers(interp, interp->ctx);
INTVAL elements;
if (PMC_IS_NULL(handlers))
return 0;
elements = VTABLE_elements(interp, handlers);
if (STRING_IS_NULL(handler_type) || STRING_IS_EMPTY(handler_type))
return elements;
/* Loop from newest handler to oldest handler. */
{
STRING *exception_str = CONST_STRING(interp, "exception");
STRING *event_str = CONST_STRING(interp, "event");
STRING *handler_str = CONST_STRING(interp, "ExceptionHandler");
INTVAL count = 0;
INTVAL index;
typedef enum { Hunknown, Hexception, Hevent } Htype;
const Htype htype =
(STRING_equal(interp, handler_type, exception_str)) ?
Hexception :
(STRING_equal(interp, handler_type, event_str)) ?
Hevent :
Hunknown;
STRING * const handler_name = (htype == Hexception) ? handler_str : (STRING *)NULL;
for (index = 0; index < elements; ++index) {
PMC * const handler = VTABLE_get_pmc_keyed_int(interp, handlers, index);
if (!PMC_IS_NULL(handler)) {
switch (htype) {
case Hexception:
if (VTABLE_isa(interp, handler, handler_name))
++count;
break;
case Hevent:
if (handler->vtable->base_type == enum_class_EventHandler)
++count;
break;
default:
break;
}
}
}
return count;
}
}
/*
=item C<void Parrot_cx_add_handler(PARROT_INTERP, PMC *handler)>
Add a task handler to scheduler's list of handlers.
=cut
*/
PARROT_EXPORT
void
Parrot_cx_add_handler(PARROT_INTERP, ARGIN(PMC *handler))
{
ASSERT_ARGS(Parrot_cx_add_handler)
STRING * const add_handler = CONST_STRING(interp, "add_handler");
if (!interp->scheduler)
Parrot_ex_throw_from_c_args(interp, NULL, EXCEPTION_INVALID_OPERATION,
"Scheduler was not initialized for this interpreter.\n");
Parrot_pcc_invoke_method_from_c_args(interp, interp->scheduler, add_handler, "P->", handler);
}
/*
=item C<void Parrot_cx_delete_handler_typed(PARROT_INTERP, STRING
*handler_type)>
Remove the top task handler of a particular type from the scheduler's list of
handlers.
=cut
*/
PARROT_EXPORT
void
Parrot_cx_delete_handler_typed(PARROT_INTERP, ARGIN(STRING *handler_type))
{
ASSERT_ARGS(Parrot_cx_delete_handler_typed)
if (!interp->scheduler)
Parrot_ex_throw_from_c_args(interp, NULL, EXCEPTION_INVALID_OPERATION,
"Scheduler was not initialized for this interpreter.\n");
Parrot_pcc_invoke_method_from_c_args(interp, interp->scheduler, CONST_STRING(interp, "delete_handler"), "S->", handler_type);
}
/*
=item C<INTVAL Parrot_cx_count_handlers_typed(PARROT_INTERP, STRING
*handler_type)>
Count the number of active handlers of a particular type (event, exception) in
the concurrency scheduler.
=cut
*/
PARROT_EXPORT
INTVAL
Parrot_cx_count_handlers_typed(PARROT_INTERP, ARGIN(STRING *handler_type))
{
ASSERT_ARGS(Parrot_cx_count_handlers_typed)
INTVAL count = 0;
if (!interp->scheduler)
Parrot_ex_throw_from_c_args(interp, NULL, EXCEPTION_INVALID_OPERATION,
"Scheduler was not initialized for this interpreter.\n");
Parrot_pcc_invoke_method_from_c_args(interp, interp->scheduler, CONST_STRING(interp, "count_handlers"), "S->I", handler_type, &count);
return count;
}
/*
=back
=head2 Scheduler Message Interface Functions
Functions that are used to interface with the message queue in the concurrency
scheduler.
=over 4
=item C<void Parrot_cx_send_message(PARROT_INTERP, STRING *messagetype, PMC
*payload)>
Send a message to a scheduler in a different interpreter/thread.
=cut
*/
PARROT_EXPORT
void
Parrot_cx_send_message(PARROT_INTERP, ARGIN(STRING *messagetype), ARGIN(SHIM(PMC *payload)))
{
ASSERT_ARGS(Parrot_cx_send_message)
if (interp->scheduler) {
Parrot_Scheduler_attributes * sched_struct = PARROT_SCHEDULER(interp->scheduler);
PMC *message = Parrot_pmc_new(interp, enum_class_SchedulerMessage);
VTABLE_set_string_native(interp, message, messagetype);
message = VTABLE_share_ro(interp, message);
#if CX_DEBUG
fprintf(stderr, "sending message[interp=%p]\n", interp);
#endif
#if CX_DEBUG
fprintf(stderr, "locking msg_lock (send) [interp=%p]\n", interp);
#endif
LOCK(sched_struct->msg_lock);
VTABLE_push_pmc(interp, sched_struct->messages, message);
#if CX_DEBUG
fprintf(stderr, "unlocking msg_lock (send) [interp=%p]\n", interp);
#endif
UNLOCK(sched_struct->msg_lock);
Parrot_cx_runloop_wake(interp, interp->scheduler);
}
}
/*
=item C<void Parrot_cx_broadcast_message(PARROT_INTERP, STRING *messagetype, PMC
*data)>
Send a message to the schedulers in all interpreters/threads linked to this
one.
=cut
*/
PARROT_EXPORT
void
Parrot_cx_broadcast_message(PARROT_INTERP, ARGIN(STRING *messagetype), ARGIN_NULLOK(PMC *data))
{
ASSERT_ARGS(Parrot_cx_broadcast_message)
UINTVAL i;
LOCK(interpreter_array_mutex);
for (i = 0; i < n_interpreters; ++i) {
Parrot_Interp other_interp = interpreter_array[i];
if (interp == other_interp)
continue;
Parrot_cx_send_message(other_interp, messagetype, data);
}
UNLOCK(interpreter_array_mutex);
}
/*
=back
=head2 Task Interface Functions
Functions that are used to interface with a specific task in the concurrency scheduler.
=over 4
=item C<PMC * Parrot_cx_find_handler_for_task(PARROT_INTERP, PMC *task)>
Retrieve a handler appropriate to a given task. If the scheduler has no
appropriate handler, returns PMCNULL.
=cut
*/
PARROT_EXPORT
PARROT_CAN_RETURN_NULL
PMC *
Parrot_cx_find_handler_for_task(PARROT_INTERP, ARGIN(PMC *task))
{
ASSERT_ARGS(Parrot_cx_find_handler_for_task)
PMC *handler = PMCNULL;
#if CX_DEBUG
fprintf(stderr, "searching for handler\n");
#endif
if (!interp->scheduler)
Parrot_ex_throw_from_c_args(interp, NULL, EXCEPTION_INVALID_OPERATION,
"Scheduler was not initialized for this interpreter.\n");
Parrot_pcc_invoke_method_from_c_args(interp, interp->scheduler, CONST_STRING(interp, "find_handler"), "P->P", task, &handler);
#if CX_DEBUG
fprintf(stderr, "done searching for handler\n");
#endif
return handler;
}
/*
=item C<PMC * Parrot_cx_find_handler_local(PARROT_INTERP, PMC *task)>
Retrieve a handler appropriate to a given task from the local context. If the
context has no appropriate handler, returns PMCNULL.
=cut
*/
PARROT_EXPORT
PARROT_CAN_RETURN_NULL
PMC *
Parrot_cx_find_handler_local(PARROT_INTERP, ARGIN(PMC *task))
{
ASSERT_ARGS(Parrot_cx_find_handler_local)
/*
* Quick&dirty way to avoid infinite recursion
* when an exception is thrown while looking
* for a handler
*/
static int already_doing = 0;
static PMC * keep_context = NULL;
PMC *context;
PMC *iter = PMCNULL;
STRING * const handled_str = CONST_STRING(interp, "handled");
STRING * const handler_iter_str = CONST_STRING(interp, "handler_iter");
STRING * const exception_str = CONST_STRING(interp, "Exception");
const Parrot_Int is_exception = VTABLE_does(interp, task, exception_str);
if (already_doing) {
Parrot_io_eprintf(interp,
"** Exception caught while looking for a handler, trying next **\n");
if (! keep_context)
return NULL;
/*
* Note that we are now trying to handle the new exception,
* not the initial task argument (exception or whatever).
*/
context = Parrot_pcc_get_caller_ctx(interp, keep_context);
keep_context = NULL;
if (context) {
PMC * const handlers = Parrot_pcc_get_handlers(interp, context);
if (!PMC_IS_NULL(handlers))
iter = VTABLE_get_iter(interp, handlers);
}
}
else {
++already_doing;
/* Exceptions store the handler iterator for rethrow, other kinds of
* tasks don't (though they could). */
if (is_exception &&
VTABLE_get_integer_keyed_str(interp, task, handled_str) == -1) {
iter = VTABLE_get_attr_str(interp, task, handler_iter_str);
context = (PMC *)VTABLE_get_pointer(interp, task);
}
else {
PMC * handlers;
context = CURRENT_CONTEXT(interp);
handlers = Parrot_pcc_get_handlers(interp, context);
if (!PMC_IS_NULL(handlers))
iter = VTABLE_get_iter(interp, handlers);
}
}
while (context) {
keep_context = context;
/* Loop from newest handler to oldest handler. */
while (!PMC_IS_NULL(iter) && VTABLE_get_bool(interp, iter)) {
PMC * const handler = VTABLE_shift_pmc(interp, iter);
if (!PMC_IS_NULL(handler)) {
INTVAL valid_handler = 0;
Parrot_pcc_invoke_method_from_c_args(interp, handler, CONST_STRING(interp, "can_handle"),
"P->I", task, &valid_handler);
if (valid_handler) {
if (is_exception) {
/* Store iterator and context for a later rethrow. */
VTABLE_set_attr_str(interp, task, handler_iter_str, iter);
VTABLE_set_pointer(interp, task, context);
}
--already_doing;
keep_context = NULL;
return handler;
}
}
}
/* Continue the search in the next context up the chain. */
context = Parrot_pcc_get_caller_ctx(interp, context);
if (context) {
PMC * const handlers = Parrot_pcc_get_handlers(interp, context);
iter = PMC_IS_NULL(handlers) ? PMCNULL :
VTABLE_get_iter(interp, handlers);
}
else
iter = PMCNULL;
}
/* Reached the end of the context chain without finding a handler. */
--already_doing;
return PMCNULL;
}
/*
=item C<void Parrot_cx_timer_invoke(PARROT_INTERP, PMC *timer)>
Run the associated code block for a timer event, when the timer fires.
=cut
*/
void
Parrot_cx_timer_invoke(PARROT_INTERP, ARGIN(PMC *timer))
{
ASSERT_ARGS(Parrot_cx_timer_invoke)
Parrot_Timer_attributes * const timer_struct = PARROT_TIMER(timer);
#if CX_DEBUG
fprintf(stderr, "current timer time: %f, %f\n",
timer_struct->birthtime + timer_struct->duration,
Parrot_floatval_time());
#endif
if (!PMC_IS_NULL(timer_struct->codeblock)) {
Parrot_ext_call(interp, timer_struct->codeblock, "->");
}
}
/*
=item C<void Parrot_cx_invoke_callback(PARROT_INTERP, PMC *callback)>
Run the associated code block for a callback event.
=cut
*/
void
Parrot_cx_invoke_callback(PARROT_INTERP, ARGIN(PMC *callback))
{
ASSERT_ARGS(Parrot_cx_invoke_callback)
Parrot_Task_attributes * const task_struct = PARROT_TASK(callback);
if (!PMC_IS_NULL(task_struct->data)) {
Parrot_run_callback(interp, task_struct->data,
task_struct->cb_data);
}
}
/*
=back
=head2 Opcode Functions
Functions that are called from within opcodes, that take and return an
opcode_t* to allow for changing the code flow.
=over 4