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/*************************************************************************
* Copyright (C) 2010-2011 Tavian Barnes <tavianator@tavianator.com> *
* *
* This file is part of The Dimension Library. *
* *
* The Dimension Library is free software; you can redistribute it and/ *
* or modify it under the terms of the GNU Lesser General Public License *
* as published by the Free Software Foundation; either version 3 of the *
* License, or (at your option) any later version. *
* *
* The Dimension Library is distributed in the hope that it will be *
* useful, but WITHOUT ANY WARRANTY; without even the implied warranty *
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
* Lesser General Public License for more details. *
* *
* You should have received a copy of the GNU Lesser General Public *
* License along with this program. If not, see *
* <http://www.gnu.org/licenses/>. *
*************************************************************************/
/**
* @file
* Background threading.
*/
#include "dimension-impl.h"
#include <pthread.h>
/** The payload to pass to the pthread callback. */
typedef struct dmnsn_thread_payload {
dmnsn_thread_fn *thread_fn;
void *arg;
dmnsn_progress *progress;
} dmnsn_thread_payload;
/** Clean up after a thread. */
static void
dmnsn_thread_cleanup(void *arg)
{
dmnsn_thread_payload *payload = arg;
dmnsn_progress *progress = payload->progress;
dmnsn_free(payload);
dmnsn_done_progress(progress);
}
/** pthread callback -- call the real thread callback. */
static void *
dmnsn_thread(void *arg)
{
dmnsn_thread_payload *payload = arg;
int *ret;
pthread_cleanup_push(dmnsn_thread_cleanup, payload);
ret = dmnsn_malloc(sizeof(int));
*ret = payload->thread_fn(payload->arg);
pthread_cleanup_pop(1);
return ret;
}
void
dmnsn_new_thread(dmnsn_progress *progress, dmnsn_thread_fn *thread_fn,
void *arg)
{
dmnsn_thread_payload *payload = dmnsn_malloc(sizeof(dmnsn_thread_payload));
payload->thread_fn = thread_fn;
payload->arg = arg;
payload->progress = progress;
if (pthread_create(&progress->thread, NULL, dmnsn_thread, payload) != 0) {
dmnsn_error("Couldn't start thread.");
}
}
/** Payload for threads executed by dmnsn_execute_concurrently(). */
typedef struct dmnsn_ccthread_payload {
dmnsn_ccthread_fn *ccthread_fn;
void *arg;
unsigned int thread, nthreads;
int ret;
} dmnsn_ccthread_payload;
static void *
dmnsn_concurrent_thread(void *ptr)
{
dmnsn_ccthread_payload *payload = ptr;
payload->ret = payload->ccthread_fn(payload->arg, payload->thread,
payload->nthreads);
return NULL;
}
int
dmnsn_execute_concurrently(dmnsn_ccthread_fn *ccthread_fn,
void *arg, unsigned int nthreads)
{
dmnsn_assert(nthreads > 0, "Attempt to execute using 0 concurrent threads.");
pthread_t threads[nthreads];
dmnsn_ccthread_payload payloads[nthreads];
for (unsigned int i = 0; i < nthreads; ++i) {
payloads[i].ccthread_fn = ccthread_fn;
payloads[i].arg = arg;
payloads[i].thread = i;
payloads[i].nthreads = nthreads;
payloads[i].ret = -1;
if (pthread_create(&threads[i], NULL, dmnsn_concurrent_thread,
&payloads[i]) != 0)
{
dmnsn_error("Couldn't start worker thread.");
}
}
int ret = 0;
for (unsigned int i = 0; i < nthreads; ++i) {
if (pthread_join(threads[i], NULL) == 0) {
if (payloads[i].ret != 0) {
ret = payloads[i].ret;
}
} else {
dmnsn_error("Couldn't join worker thread.");
}
}
return ret;
}
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