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/*
* Copyright (C) 2024 Nuo Mi
*
* This file is part of FFmpeg.
*
* FFmpeg 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 2.1 of the License, or (at your option) any later version.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "config.h"
#include <stdbool.h>
#include "libavutil/mem.h"
#include "libavutil/thread.h"
#include "executor.h"
#if !HAVE_THREADS
#define ExecutorThread char
#define executor_thread_create(t, a, s, ar) 0
#define executor_thread_join(t, r) do {} while(0)
#else
#define ExecutorThread pthread_t
#define executor_thread_create(t, a, s, ar) pthread_create(t, a, s, ar)
#define executor_thread_join(t, r) pthread_join(t, r)
#endif //!HAVE_THREADS
typedef struct ThreadInfo {
FFExecutor *e;
ExecutorThread thread;
} ThreadInfo;
typedef struct Queue {
FFTask *head;
FFTask *tail;
} Queue;
struct FFExecutor {
FFTaskCallbacks cb;
int thread_count;
bool recursive;
ThreadInfo *threads;
uint8_t *local_contexts;
AVMutex lock;
AVCond cond;
int die;
Queue *q;
};
static FFTask* remove_task(Queue *q)
{
FFTask *t = q->head;
if (t) {
q->head = t->next;
t->next = NULL;
if (!q->head)
q->tail = NULL;
}
return t;
}
static void add_task(Queue *q, FFTask *t)
{
t->next = NULL;
if (!q->head)
q->tail = q->head = t;
else
q->tail = q->tail->next = t;
}
static int run_one_task(FFExecutor *e, void *lc)
{
FFTaskCallbacks *cb = &e->cb;
FFTask *t = NULL;
for (int i = 0; i < e->cb.priorities && !t; i++)
t = remove_task(e->q + i);
if (t) {
if (e->thread_count > 0)
ff_mutex_unlock(&e->lock);
cb->run(t, lc, cb->user_data);
if (e->thread_count > 0)
ff_mutex_lock(&e->lock);
return 1;
}
return 0;
}
#if HAVE_THREADS
static void *executor_worker_task(void *data)
{
ThreadInfo *ti = (ThreadInfo*)data;
FFExecutor *e = ti->e;
void *lc = e->local_contexts + (ti - e->threads) * e->cb.local_context_size;
ff_mutex_lock(&e->lock);
while (1) {
if (e->die) break;
if (!run_one_task(e, lc)) {
//no task in one loop
ff_cond_wait(&e->cond, &e->lock);
}
}
ff_mutex_unlock(&e->lock);
return NULL;
}
#endif
static void executor_free(FFExecutor *e, const int has_lock, const int has_cond)
{
if (e->thread_count) {
//signal die
ff_mutex_lock(&e->lock);
e->die = 1;
ff_cond_broadcast(&e->cond);
ff_mutex_unlock(&e->lock);
for (int i = 0; i < e->thread_count; i++)
executor_thread_join(e->threads[i].thread, NULL);
}
if (has_cond)
ff_cond_destroy(&e->cond);
if (has_lock)
ff_mutex_destroy(&e->lock);
av_free(e->threads);
av_free(e->q);
av_free(e->local_contexts);
av_free(e);
}
FFExecutor* ff_executor_alloc(const FFTaskCallbacks *cb, int thread_count)
{
FFExecutor *e;
int has_lock = 0, has_cond = 0;
if (!cb || !cb->user_data || !cb->run || !cb->priorities)
return NULL;
e = av_mallocz(sizeof(*e));
if (!e)
return NULL;
e->cb = *cb;
e->local_contexts = av_calloc(FFMAX(thread_count, 1), e->cb.local_context_size);
if (!e->local_contexts)
goto free_executor;
e->q = av_calloc(e->cb.priorities, sizeof(Queue));
if (!e->q)
goto free_executor;
e->threads = av_calloc(FFMAX(thread_count, 1), sizeof(*e->threads));
if (!e->threads)
goto free_executor;
if (!thread_count)
return e;
has_lock = !ff_mutex_init(&e->lock, NULL);
has_cond = !ff_cond_init(&e->cond, NULL);
if (!has_lock || !has_cond)
goto free_executor;
for (/* nothing */; e->thread_count < thread_count; e->thread_count++) {
ThreadInfo *ti = e->threads + e->thread_count;
ti->e = e;
if (executor_thread_create(&ti->thread, NULL, executor_worker_task, ti))
goto free_executor;
}
return e;
free_executor:
executor_free(e, has_lock, has_cond);
return NULL;
}
void ff_executor_free(FFExecutor **executor)
{
int thread_count;
if (!executor || !*executor)
return;
thread_count = (*executor)->thread_count;
executor_free(*executor, thread_count, thread_count);
*executor = NULL;
}
void ff_executor_execute(FFExecutor *e, FFTask *t)
{
if (e->thread_count)
ff_mutex_lock(&e->lock);
if (t)
add_task(e->q + t->priority % e->cb.priorities, t);
if (e->thread_count) {
ff_cond_signal(&e->cond);
ff_mutex_unlock(&e->lock);
}
if (!e->thread_count || !HAVE_THREADS) {
if (e->recursive)
return;
e->recursive = true;
// We are running in a single-threaded environment, so we must handle all tasks ourselves
while (run_one_task(e, e->local_contexts))
/* nothing */;
e->recursive = false;
}
}
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