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/**************************************************************************
*
* Copyright 2019 Red Hat.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
**************************************************************************/
/**
* compute shader thread pool.
* based on threadpool.c but modified heavily to be compute shader tuned.
*/
#include "util/u_thread.h"
#include "util/u_memory.h"
#include "lp_cs_tpool.h"
static int
lp_cs_tpool_worker(void *data)
{
struct lp_cs_tpool *pool = data;
struct lp_cs_local_mem lmem;
memset(&lmem, 0, sizeof(lmem));
mtx_lock(&pool->m);
while (!pool->shutdown) {
struct lp_cs_tpool_task *task;
while (list_is_empty(&pool->workqueue) && !pool->shutdown)
cnd_wait(&pool->new_work, &pool->m);
if (pool->shutdown)
break;
task = list_first_entry(&pool->workqueue, struct lp_cs_tpool_task,
list);
unsigned this_iter = task->iter_start++;
if (task->iter_start == task->iter_total)
list_del(&task->list);
mtx_unlock(&pool->m);
task->work(task->data, this_iter, &lmem);
mtx_lock(&pool->m);
task->iter_finished++;
if (task->iter_finished == task->iter_total)
cnd_broadcast(&task->finish);
}
mtx_unlock(&pool->m);
FREE(lmem.local_mem_ptr);
return 0;
}
struct lp_cs_tpool *
lp_cs_tpool_create(unsigned num_threads)
{
struct lp_cs_tpool *pool = CALLOC_STRUCT(lp_cs_tpool);
if (!pool)
return NULL;
(void) mtx_init(&pool->m, mtx_plain);
cnd_init(&pool->new_work);
list_inithead(&pool->workqueue);
assert (num_threads <= LP_MAX_THREADS);
pool->num_threads = num_threads;
for (unsigned i = 0; i < num_threads; i++)
pool->threads[i] = u_thread_create(lp_cs_tpool_worker, pool);
return pool;
}
void
lp_cs_tpool_destroy(struct lp_cs_tpool *pool)
{
if (!pool)
return;
mtx_lock(&pool->m);
pool->shutdown = true;
cnd_broadcast(&pool->new_work);
mtx_unlock(&pool->m);
for (unsigned i = 0; i < pool->num_threads; i++) {
thrd_join(pool->threads[i], NULL);
}
cnd_destroy(&pool->new_work);
mtx_destroy(&pool->m);
FREE(pool);
}
struct lp_cs_tpool_task *
lp_cs_tpool_queue_task(struct lp_cs_tpool *pool,
lp_cs_tpool_task_func work, void *data, int num_iters)
{
struct lp_cs_tpool_task *task;
if (pool->num_threads == 0) {
struct lp_cs_local_mem lmem;
memset(&lmem, 0, sizeof(lmem));
for (unsigned t = 0; t < num_iters; t++) {
work(data, t, &lmem);
}
return NULL;
}
task = CALLOC_STRUCT(lp_cs_tpool_task);
if (!task) {
return NULL;
}
task->work = work;
task->data = data;
task->iter_total = num_iters;
cnd_init(&task->finish);
mtx_lock(&pool->m);
list_addtail(&task->list, &pool->workqueue);
cnd_signal(&pool->new_work);
mtx_unlock(&pool->m);
return task;
}
void
lp_cs_tpool_wait_for_task(struct lp_cs_tpool *pool,
struct lp_cs_tpool_task **task_handle)
{
struct lp_cs_tpool_task *task = *task_handle;
if (!pool || !task)
return;
mtx_lock(&pool->m);
while (task->iter_finished < task->iter_total)
cnd_wait(&task->finish, &pool->m);
mtx_unlock(&pool->m);
cnd_destroy(&task->finish);
FREE(task);
*task_handle = NULL;
}
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