/*
* Send notifications from this thread, to be caught in the main thread
*/
static gpointer
thread1_start (ITSignaler *its)
{
gint i, counter;
itsignaler_ref (its);
for (counter = 0, i = 0; i < MAX_ITERATIONS; i++) {
Data *data;
g_mutex_lock (&mutex);
data = g_new0 (Data, 1);
data->counter = counter++;
#ifndef PERF
g_print ("Pushing %d...\n", counter);
#endif
itsignaler_push_notification (its, data, g_free);
g_mutex_unlock (&mutex);
g_mutex_lock (&mutex);
data = g_new0 (Data, 1);
data->counter = counter++;
itsignaler_push_notification (its, data, g_free);
g_mutex_unlock (&mutex);
}
itsignaler_unref (its);
return (gpointer) 0x01;
}
/*
* main function of the worker thread
*/
static gpointer
worker_thread_main (GdaWorker *worker)
{
#define TIMER 150
#ifdef DEBUG_NOTIFICATION
g_print ("[W] GdaWorker %p, worker thread %p started!\n", worker, g_thread_self());
#endif
itsignaler_ref (worker->submit_its);
while (1) {
WorkerJob *job;
job = itsignaler_pop_notification (worker->submit_its, TIMER);
if (job) {
g_rec_mutex_lock (&worker->rmutex);
if (! (job->status & JOB_CANCELLED)) {
/* handle job */
job->status |= JOB_BEING_PROCESSED;
g_rec_mutex_unlock (&worker->rmutex);
job->result = job->func (job->data, & job->error);
g_rec_mutex_lock (&worker->rmutex);
job->status |= JOB_PROCESSED;
if (job->reply_its)
itsignaler_push_notification (job->reply_its, job, NULL);
}
if ((job->status & JOB_CANCELLED) && worker->jobs_hash)
g_hash_table_remove (worker->jobs_hash, &job->id);
g_rec_mutex_unlock (&worker->rmutex);
}
if (worker->worker_must_quit) {
#ifdef DEBUG_NOTIFICATION
g_print ("[W] GdaWorker %p, worker thread %p finished!\n", worker, g_thread_self());
#endif
itsignaler_unref (worker->submit_its);
g_rec_mutex_clear (& worker->rmutex);
g_slice_free (GdaWorker, worker);
bg_update_stats (BG_DESTROYED_WORKER);
bg_join_thread ();
return NULL;
}
}
return NULL;
}
static WorkerJob *
worker_job_new (ITSignaler *reply_its, GdaWorkerFunc func, gpointer data, GDestroyNotify data_destroy_func,
GDestroyNotify result_destroy_func)
{
static guint counter = 0;
WorkerJob *job;
job = g_slice_new0 (WorkerJob);
counter ++;
job->id = counter;
job->status = JOB_QUEUED;
job->reply_its = reply_its ? itsignaler_ref (reply_its) : NULL;
job->func = func;
job->data = data;
job->data_destroy_func = data_destroy_func;
job->result = NULL;
job->result_destroy_func = result_destroy_func;
job->error = NULL;
return job;
}
/**
* gda_worker_do_job: (skip)
* @worker: a #GdaWorker object
* @context: (allow-none): a #GMainContext to execute a main loop in (while waiting), or %NULL
* @timeout_ms: the maximum number of milisecons to wait before returning, or %0 for unlimited wait
* @out_result: (allow-none): a place to store the result, if any, of @func's execution, or %NULL
* @out_job_id: (allow-none): a place to store the ID of the job having been submitted, or %NULL
* @func: the function to call from the worker thread
* @data: (allow-none): the data to pass to @func, or %NULL
* @data_destroy_func: (allow-none): a function to destroy @data, or %NULL
* @result_destroy_func: (allow-none): a function to destroy the result, if any, of @func's execution, or %NULL
* @error: (allow-none): a place to store errors, or %NULL.
*
* Request that the worker thread call @func with the @data argument, much like gda_worker_submit_job(),
* but waits (starting a #GMainLoop) for a maximum of @timeout_ms miliseconds for @func to be executed.
*
* If this function is called from within @worker's worker thread, then this function simply calls @func with @data and does not
* use @context.
*
* The following cases are possible if this function is not called from within @worker's worker thread:
* <itemizedlist>
* <listitem><para>the call to @func took less than @timeout_ms miliseconds: the return value is %TRUE and
* @out_result contains the result of the @func's execution, and @out_job_id contains %NULL. Note in this
* case that @error may still contain an error code if @func's execution produced an error. Also note that in this case
* any setting defined by gda_worker_set_callback() is not applied (as the result is immediately returned)</para></listitem>
* <listitem><para>The call to @func takes more then @timeout_ms miliseconds: the return value is %TRUE and
* @out_result is %NULL and @out_job_id contains the ID of the job as if it had been submitted using gda_worker_submit_job().
* If @out_job_id is %NULL, and if no setting has been defined using gda_worker_set_callback(), then the job will be discarded
* (as if gda_worker_forget_job() had been called).
* </para></listitem>
* <listitem><para>The call to @func could not be done (some kind of plumbing error for instance): the returned value is %FALSE
* and @out_result and @out_job_id are set to %NULL (if they are not %NULL)</para></listitem>
* </itemizedlist>
*
* Notes:
* <itemizedlist>
* <listitem><para>@result_destroy_func is needed in case @out_result is %NULL (to avoid memory leaks)</para></listitem>
* <listitem><para>passing %NULL for @context is similar to passing the result of g_main_context_ref_thread_default()</para></listitem>
* </itemizedlist>
*
* Returns: %TRUE if no error occurred
*
* Since: 6.0
*/
gboolean
gda_worker_do_job (GdaWorker *worker, GMainContext *context, gint timeout_ms,
gpointer *out_result, guint *out_job_id,
GdaWorkerFunc func, gpointer data, GDestroyNotify data_destroy_func,
GDestroyNotify result_destroy_func,
GError **error)
{
if (out_result)
*out_result = NULL;
if (out_job_id)
*out_job_id = 0;
g_return_val_if_fail (worker, FALSE);
g_return_val_if_fail (func, FALSE);
if (!worker->callbacks_hash || !worker->jobs_hash) {
g_warning ("GdaWorker has been destroyed\n");
return FALSE;
}
if (gda_worker_thread_is_worker (worker)) {
/* we are called from within the worker thread => call the function directly */
gpointer result;
result = func (data, error);
if (data_destroy_func)
data_destroy_func (data);
if (out_result)
*out_result = result;
else if (result && result_destroy_func)
result_destroy_func (result);
return TRUE;
}
guint jid, itsid, timer = 0;
/* determine which GMainContext to use */
GMainContext *co;
gboolean unref_co = FALSE;
co = context;
if (!co) {
co = g_main_context_ref_thread_default ();
unref_co = TRUE;
}
/* prepare main loop */
GMainLoop *loop;
loop = g_main_loop_new (co, FALSE);
/* prepare ITSignaler to be notified */
ITSignaler *its;
its = itsignaler_new ();
itsid = itsignaler_add (its, co, (ITSignalerFunc) do_itsignaler_cb,
g_main_loop_ref (loop), (GDestroyNotify) g_main_loop_unref);
/* push job */
g_rec_mutex_lock (& worker->rmutex); /* required to call _gda_worker_submit_job_with_its() */
jid = _gda_worker_submit_job_with_its (worker, its,
func, data, data_destroy_func, result_destroy_func, error);
g_rec_mutex_unlock (& worker->rmutex);
if (jid == 0) {
/* an error occurred */
g_assert (itsignaler_remove (its, co, itsid));
itsignaler_unref (its);
g_main_loop_unref (loop);
if (unref_co)
g_main_context_unref (co);
return FALSE;
}
/* check if result is already here */
WorkerJob *job;
job = itsignaler_pop_notification (its, 0);
if (!job) {
if (timeout_ms > 0) {
/* start timer to limit waiting time */
GSource *timer_src;
timer_src = g_timeout_source_new (timeout_ms);
g_source_set_callback (timer_src, (GSourceFunc) do_timer_cb, loop, NULL);
timer = g_source_attach (timer_src, co);
g_source_unref (timer_src);
}
g_main_loop_run (loop);
/* either timer has arrived or job has been done */
job = itsignaler_pop_notification (its, 0);
}
g_main_loop_unref (loop);
g_assert (itsignaler_remove (its, co, itsid));
itsignaler_unref (its);
if (job) {
/* job done before the timer, if any, elapsed */
if (timer > 0)
g_assert (g_source_remove (timer));
g_assert (gda_worker_fetch_job_result (worker, jid, out_result, error));
}
else {
/* timer came first, job is not yet finished */
/* apply settings from gda_worker_set_callback(), if any */
g_rec_mutex_lock (&worker->rmutex);
DeclaredCallback *dc;
dc = g_hash_table_lookup (worker->callbacks_hash, co);
if (dc) {
job = g_hash_table_lookup (worker->jobs_hash, &jid);
g_assert (job);
g_assert (!job->reply_its);
job->reply_its = itsignaler_ref (dc->its);
}
g_rec_mutex_unlock (& worker->rmutex);
/* cleanups */
if (out_job_id)
*out_job_id = jid;
else if (!dc)
/* forget all about the job */
gda_worker_forget_job (worker, jid);
}
if (unref_co)
g_main_context_unref (co);
return TRUE;
}