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/*
* Copyright 2018 Anton Khirnov <anton@khirnov.net>
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include <errno.h>
#include <omp.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <stdio.h>
#include "threadpool.h"
struct TPContext {
unsigned int nb_threads;
};
void tp_free(TPContext **pctx)
{
TPContext *ctx = *pctx;
if (!ctx)
return;
free(ctx);
*pctx = NULL;
}
int tp_init(TPContext **pctx, unsigned int nb_threads)
{
TPContext *ctx = NULL;
int ret;
if (!nb_threads) {
const char *env_threads = getenv("OMP_NUM_THREADS");
if (env_threads) {
nb_threads = strtol(env_threads, NULL, 0);
}
#ifdef _SC_NPROCESSORS_ONLN
else {
long val = sysconf(_SC_NPROCESSORS_ONLN);
if (val > 0)
nb_threads = val;
}
#endif
if (!nb_threads) {
ret = -EINVAL;
goto fail;
}
}
ctx = calloc(1, sizeof(*ctx));
if (!ctx) {
ret = -ENOMEM;
goto fail;
}
omp_set_num_threads(nb_threads);
ctx->nb_threads = nb_threads;
*pctx = ctx;
return 0;
fail:
tp_free(&ctx);
*pctx = NULL;
return ret;
}
int tp_execute(TPContext *ctx, unsigned int nb_jobs,
TPExecuteCallback func, void *func_arg)
{
#pragma omp parallel for
for (unsigned int i = 0; i < nb_jobs; i++)
func(func_arg, i, omp_get_thread_num());
return 0;
}
unsigned int tp_get_nb_threads(TPContext *ctx)
{
return ctx->nb_threads;
}
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