/* * 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; }