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/*
* This file is part of LEM, a Lua Event Machine.
* Copyright 2011-2012 Emil Renner Berthing
*
* LEM is free software: you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation, either version 3 of
* the License, or (at your option) any later version.
*
* LEM 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with LEM. If not, see <http://www.gnu.org/licenses/>.
*/
#define POOL_THREADS_MIN 1
static unsigned int pool_jobs;
static unsigned int pool_threads;
static time_t pool_delay;
static pthread_mutex_t pool_mutex;
static pthread_cond_t pool_cond;
static struct lem_async *pool_head;
static struct lem_async *pool_tail;
static struct lem_async *pool_done;
static struct ev_async pool_watch;
static void *
pool_threadfunc(void *arg)
{
struct lem_async *a;
struct timespec ts;
struct timeval tv;
(void)arg;
while (1) {
gettimeofday(&tv, NULL);
ts.tv_sec = tv.tv_sec + pool_delay;
ts.tv_nsec = 1000*tv.tv_usec;
pthread_mutex_lock(&pool_mutex);
while ((a = pool_head) == NULL) {
if (pool_threads <= POOL_THREADS_MIN) {
pthread_cond_wait(&pool_cond, &pool_mutex);
continue;
}
if (pthread_cond_timedwait(&pool_cond, &pool_mutex, &ts)
&& pool_threads > POOL_THREADS_MIN)
goto out;
}
pool_head = a->next;
pthread_mutex_unlock(&pool_mutex);
lem_debug("Running job %p", a);
a->work(a);
lem_debug("Bye %p", a);
pthread_mutex_lock(&pool_mutex);
a->next = pool_done;
pool_done = a;
pthread_mutex_unlock(&pool_mutex);
ev_async_send(LEM_ &pool_watch);
}
out:
pool_threads--;
pthread_mutex_unlock(&pool_mutex);
return NULL;
}
static void
pool_cb(EV_A_ struct ev_async *w, int revents)
{
struct lem_async *a;
struct lem_async *next;
(void)revents;
pthread_mutex_lock(&pool_mutex);
a = pool_done;
pool_done = NULL;
pthread_mutex_unlock(&pool_mutex);
for (; a; a = next) {
pool_jobs--;
next = a->next;
a->reap(a);
}
if (pool_jobs == 0)
ev_async_stop(LEM_ w);
}
static int
pool_init(time_t delay)
{
int ret;
/*
pool_jobs = 0;
pool_threads = 0;
*/
pool_delay = delay;
/*
pool_head = NULL;
pool_tail = NULL;
pool_done = NULL;
*/
ev_async_init(&pool_watch, pool_cb);
ret = pthread_mutex_init(&pool_mutex, NULL);
if (ret) {
lem_log_error("error initializing mutex: %s",
strerror(ret));
return -1;
}
ret = pthread_cond_init(&pool_cond, NULL);
if (ret) {
lem_log_error("error initializing cond: %s",
strerror(ret));
return -1;
}
return 0;
}
void
lem_async_put(struct lem_async *a)
{
int ret = 0;
if (pool_jobs == 0)
ev_async_start(LEM_ &pool_watch);
pool_jobs++;
a->next = NULL;
pthread_mutex_lock(&pool_mutex);
if (pool_head == NULL) {
pool_head = a;
pool_tail = a;
} else {
pool_tail->next = a;
pool_tail = a;
}
if (pool_jobs > pool_threads) {
pool_threads++;
ret = 1;
}
pthread_mutex_unlock(&pool_mutex);
pthread_cond_signal(&pool_cond);
if (ret) {
pthread_attr_t attr;
pthread_t thread;
ret = pthread_attr_init(&attr);
if (ret)
goto error;
ret = pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
if (ret) {
pthread_attr_destroy(&attr);
goto error;
}
ret = pthread_create(&thread, &attr, pool_threadfunc, NULL);
pthread_attr_destroy(&attr);
if (ret)
goto error;
}
return;
error:
lem_log_error("error spawning thread: %s", strerror(ret));
lem_exit(EXIT_FAILURE);
}
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