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/*
* Unix SMB/CIFS implementation.
* threadpool implementation based on pthreads
* Copyright (C) Volker Lendecke 2009,2011
*
* 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 "replace.h"
#include "system/filesys.h"
#include "pthreadpool_pipe.h"
#include "pthreadpool.h"
struct pthreadpool_pipe {
struct pthreadpool *pool;
int num_jobs;
pid_t pid;
int pipe_fds[2];
};
static int pthreadpool_pipe_signal(int jobid,
void (*job_fn)(void *private_data),
void *job_private_data,
void *private_data);
int pthreadpool_pipe_init(unsigned max_threads,
struct pthreadpool_pipe **presult)
{
struct pthreadpool_pipe *pool;
int ret;
pool = calloc(1, sizeof(struct pthreadpool_pipe));
if (pool == NULL) {
return ENOMEM;
}
pool->pid = getpid();
ret = pipe(pool->pipe_fds);
if (ret == -1) {
int err = errno;
free(pool);
return err;
}
ret = pthreadpool_init(max_threads, &pool->pool,
pthreadpool_pipe_signal, pool);
if (ret != 0) {
close(pool->pipe_fds[0]);
close(pool->pipe_fds[1]);
free(pool);
return ret;
}
*presult = pool;
return 0;
}
static int pthreadpool_pipe_signal(int jobid,
void (*job_fn)(void *private_data),
void *job_private_data,
void *private_data)
{
struct pthreadpool_pipe *pool = private_data;
ssize_t written;
do {
written = write(pool->pipe_fds[1], &jobid, sizeof(jobid));
} while ((written == -1) && (errno == EINTR));
if (written != sizeof(jobid)) {
return errno;
}
return 0;
}
int pthreadpool_pipe_destroy(struct pthreadpool_pipe *pool)
{
int ret;
if (pool->num_jobs != 0) {
return EBUSY;
}
ret = pthreadpool_destroy(pool->pool);
if (ret != 0) {
return ret;
}
close(pool->pipe_fds[0]);
pool->pipe_fds[0] = -1;
close(pool->pipe_fds[1]);
pool->pipe_fds[1] = -1;
free(pool);
return 0;
}
static int pthreadpool_pipe_reinit(struct pthreadpool_pipe *pool)
{
pid_t pid = getpid();
int signal_fd;
int ret;
if (pid == pool->pid) {
return 0;
}
signal_fd = pool->pipe_fds[0];
close(pool->pipe_fds[0]);
pool->pipe_fds[0] = -1;
close(pool->pipe_fds[1]);
pool->pipe_fds[1] = -1;
ret = pipe(pool->pipe_fds);
if (ret != 0) {
return errno;
}
ret = dup2(pool->pipe_fds[0], signal_fd);
if (ret != 0) {
return errno;
}
pool->pipe_fds[0] = signal_fd;
pool->num_jobs = 0;
return 0;
}
int pthreadpool_pipe_add_job(struct pthreadpool_pipe *pool, int job_id,
void (*fn)(void *private_data),
void *private_data)
{
int ret;
ret = pthreadpool_pipe_reinit(pool);
if (ret != 0) {
return ret;
}
ret = pthreadpool_add_job(pool->pool, job_id, fn, private_data);
if (ret != 0) {
return ret;
}
pool->num_jobs += 1;
return 0;
}
int pthreadpool_pipe_signal_fd(struct pthreadpool_pipe *pool)
{
return pool->pipe_fds[0];
}
int pthreadpool_pipe_finished_jobs(struct pthreadpool_pipe *pool, int *jobids,
unsigned num_jobids)
{
ssize_t to_read, nread, num_jobs;
pid_t pid = getpid();
if (pool->pid != pid) {
return EINVAL;
}
to_read = sizeof(int) * num_jobids;
do {
nread = read(pool->pipe_fds[0], jobids, to_read);
} while ((nread == -1) && (errno == EINTR));
if (nread == -1) {
return -errno;
}
if ((nread % sizeof(int)) != 0) {
return -EINVAL;
}
num_jobs = nread / sizeof(int);
if (num_jobs > pool->num_jobs) {
return -EINVAL;
}
pool->num_jobs -= num_jobs;
return num_jobs;
}
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