/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright 2024 Olaf Wintermann. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include "threadpool.h"
#include "context.h"
#ifndef _WIN32
#include <pthread.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
static threadpool_job kill_job;
UiThreadpool* threadpool_new(int min, int max) {
UiThreadpool *pool = malloc(sizeof(UiThreadpool));
pool->queue = NULL;
pool->queue_len = 0;
pool->num_idle = 0;
pool->min_threads = min;
pool->max_threads = max;
pthread_mutex_init(&pool->queue_lock, NULL);
pthread_mutex_init(&pool->avlbl_lock, NULL);
pthread_cond_init(&pool->available, NULL);
return pool;
}
int threadpool_start(UiThreadpool *pool) {
/* create pool threads */
for(int i=0;i<pool->min_threads;i++) {
pthread_t t;
if (pthread_create(&t, NULL, threadpool_func, pool) != 0) {
fprintf(stderr, "uic: threadpool_start: pthread_create failed: %s", strerror(errno));
return 1;
}
}
return 0;
}
void* threadpool_func(void *data) {
UiThreadpool *pool = (UiThreadpool*)data;
for(;;) {
threadpool_job *job = threadpool_get_job(pool);
if(job == &kill_job) {
break;
}
job->callback(job->data);
free(job);
}
return NULL;
}
threadpool_job* threadpool_get_job(UiThreadpool *pool) {
pthread_mutex_lock(&pool->queue_lock);
threadpool_job *job = NULL;
pool->num_idle++;
while(job == NULL) {
if(pool->queue_len == 0) {
pthread_cond_wait(&pool->available, &pool->queue_lock);
continue;
} else {
pool_queue_t *q = pool->queue;
job = q->job;
pool->queue = q->next;
pool->queue_len--;
free(q);
}
}
pool->num_idle--;
pthread_mutex_unlock(&pool->queue_lock);
return job;
}
void threadpool_run(UiThreadpool *pool, job_callback_f func, void *data) {
// TODO: handle errors
threadpool_job *job = malloc(sizeof(threadpool_job));
job->callback = func;
job->data = data;
pthread_mutex_lock(&pool->queue_lock);
threadpool_enqueue_job(pool, job);
int create_thread = 0;
int destroy_thread = 0;
int diff = pool->queue_len - pool->num_idle;
//if(pool->queue_len == 1) {
pthread_cond_signal(&pool->available);
//}
pthread_mutex_unlock(&pool->queue_lock);
}
void threadpool_enqueue_job(UiThreadpool *pool, threadpool_job *job) {
pool_queue_t *q = malloc(sizeof(pool_queue_t));
q->job = job;
q->next = NULL;
if(pool->queue == NULL) {
pool->queue = q;
} else {
pool_queue_t *last_elem = pool->queue;
while(last_elem->next != NULL) {
last_elem = last_elem->next;
}
last_elem->next = q;
}
pool->queue_len++;
}
UiThreadpool* ui_threadpool_create(int nthreads) {
UiThreadpool *pool = threadpool_new(nthreads, nthreads);
threadpool_start(pool); // TODO: check return value
return pool;
}
void ui_threadpool_destroy(UiThreadpool* pool) {
}
static int ui_threadpool_job_finish(void *data) {
UiJob *job = data;
UiEvent event;
event.obj = job->obj;
event.window = job->obj->window;
event.document = job->obj->ctx->document;
event.intval = 0;
event.eventdata = NULL;
job->finish_callback(&event, job->finish_data);
free(job);
return 0;
}
static void* ui_threadpool_job_func(void *data) {
UiJob *job = data;
if (!job->job_func(job->job_data) && job->finish_callback) {
ui_call_mainthread(ui_threadpool_job_finish, job);
} else {
free(job);
}
return NULL;
}
void ui_threadpool_job(UiThreadpool* pool, UiObject* obj, ui_threadfunc tf, void* td, ui_callback f, void* fd) {
UiJob* job = malloc(sizeof(UiJob));
job->obj = obj;
job->job_func = tf;
job->job_data = td;
job->finish_callback = f;
job->finish_data = fd;
threadpool_run(pool, ui_threadpool_job_func, job);
}
#endif