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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Mupen64plus - util.h *
* Mupen64Plus homepage: http://code.google.com/p/mupen64plus/ *
* Copyright (C) 2012 Mupen64plus development team *
* *
* This program 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 2 of the License, or *
* (at your option) any later version. *
* *
* This program 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 this program; if not, write to the *
* Free Software Foundation, Inc., *
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
#include "workqueue.h"
#include <SDL.h>
#include <SDL_thread.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include "api/callbacks.h"
#include "api/m64p_types.h"
#include "main/list.h"
#define WORKQUEUE_THREADS 1
struct workqueue_mgmt_globals {
struct list_head work_queue;
struct list_head thread_queue;
struct list_head thread_list;
SDL_mutex *lock;
};
struct workqueue_thread {
SDL_Thread *thread;
SDL_cond *work_avail;
struct list_head list;
struct list_head list_mgmt;
};
static struct workqueue_mgmt_globals workqueue_mgmt;
static void workqueue_dismiss(struct work_struct *work)
{
}
static struct work_struct *workqueue_get_work(struct workqueue_thread *thread)
{
int found = 0;
struct work_struct *work;
while (1) {
SDL_LockMutex(workqueue_mgmt.lock);
list_del_init(&thread->list);
if (!list_empty(&workqueue_mgmt.work_queue)) {
found = 1;
work = list_first_entry(&workqueue_mgmt.work_queue, struct work_struct, list);
list_del_init(&work->list);
} else {
list_add(&thread->list, &workqueue_mgmt.thread_queue);
SDL_CondWait(thread->work_avail, workqueue_mgmt.lock);
}
SDL_UnlockMutex(workqueue_mgmt.lock);
if (found)
break;
}
return work;
}
static int workqueue_thread_handler(void *data)
{
struct workqueue_thread *thread = data;
struct work_struct *work;
while (1) {
work = workqueue_get_work(thread);
if (work->func == workqueue_dismiss) {
free(work);
break;
}
work->func(work);
}
return 0;
}
int workqueue_init(void)
{
size_t i;
struct workqueue_thread *thread;
memset(&workqueue_mgmt, 0, sizeof(workqueue_mgmt));
INIT_LIST_HEAD(&workqueue_mgmt.work_queue);
INIT_LIST_HEAD(&workqueue_mgmt.thread_queue);
INIT_LIST_HEAD(&workqueue_mgmt.thread_list);
workqueue_mgmt.lock = SDL_CreateMutex();
if (!workqueue_mgmt.lock) {
DebugMessage(M64MSG_ERROR, "Could not create workqueue management");
return -1;
}
SDL_LockMutex(workqueue_mgmt.lock);
for (i = 0; i < WORKQUEUE_THREADS; i++) {
thread = malloc(sizeof(*thread));
if (!thread) {
DebugMessage(M64MSG_ERROR, "Could not create workqueue thread management data");
SDL_UnlockMutex(workqueue_mgmt.lock);
return -1;
}
memset(thread, 0, sizeof(*thread));
list_add(&thread->list_mgmt, &workqueue_mgmt.thread_list);
INIT_LIST_HEAD(&thread->list);
thread->work_avail = SDL_CreateCond();
if (!thread->work_avail) {
DebugMessage(M64MSG_ERROR, "Could not create workqueue thread work_avail condition");
SDL_UnlockMutex(workqueue_mgmt.lock);
return -1;
}
#if SDL_VERSION_ATLEAST(2,0,0)
thread->thread = SDL_CreateThread(workqueue_thread_handler, "m64pwq", thread);
#else
thread->thread = SDL_CreateThread(workqueue_thread_handler, thread);
#endif
if (!thread->thread) {
DebugMessage(M64MSG_ERROR, "Could not create workqueue thread handler");
SDL_UnlockMutex(workqueue_mgmt.lock);
return -1;
}
}
SDL_UnlockMutex(workqueue_mgmt.lock);
return 0;
}
void workqueue_shutdown(void)
{
size_t i;
int status;
struct work_struct *work;
struct workqueue_thread *thread, *safe;
for (i = 0; i < WORKQUEUE_THREADS; i++) {
work = malloc(sizeof(*work));
init_work(work, workqueue_dismiss);
queue_work(work);
}
list_for_each_entry_safe_t(thread, safe, &workqueue_mgmt.thread_list, struct workqueue_thread, list_mgmt) {
list_del(&thread->list_mgmt);
SDL_WaitThread(thread->thread, &status);
SDL_DestroyCond(thread->work_avail);
free(thread);
}
if (!list_empty(&workqueue_mgmt.work_queue))
DebugMessage(M64MSG_WARNING, "Stopped workqueue with work still pending");
SDL_DestroyMutex(workqueue_mgmt.lock);
}
int queue_work(struct work_struct *work)
{
struct workqueue_thread *thread;
SDL_LockMutex(workqueue_mgmt.lock);
list_add_tail(&work->list, &workqueue_mgmt.work_queue);
if (!list_empty(&workqueue_mgmt.thread_queue)) {
thread = list_first_entry(&workqueue_mgmt.thread_queue, struct workqueue_thread, list);
list_del_init(&thread->list);
SDL_CondSignal(thread->work_avail);
}
SDL_UnlockMutex(workqueue_mgmt.lock);
return 0;
}
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