58 lines
1.4 KiB
C
58 lines
1.4 KiB
C
/*
|
|
* Copyright 2021 Regents of the University of Michigan
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
#include <pthread.h>
|
|
#include <assert.h>
|
|
#include <string.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
|
|
#include "xalloc.h"
|
|
|
|
static pthread_mutex_t **mutexes = NULL;
|
|
|
|
static pthread_mutex_t *get_mutex(int fd)
|
|
{
|
|
assert(fd < 3 && "todo: implement generically");
|
|
if (!mutexes) {
|
|
mutexes = xmalloc(3 * sizeof(char *));
|
|
assert(mutexes);
|
|
}
|
|
if (!mutexes[fd]) {
|
|
mutexes[fd] = xmalloc(sizeof(pthread_mutex_t));
|
|
assert(mutexes[fd]);
|
|
pthread_mutex_init(mutexes[fd], NULL);
|
|
assert(mutexes[fd]);
|
|
}
|
|
return mutexes[fd];
|
|
}
|
|
|
|
int lock_fd(int fd) { return pthread_mutex_lock(get_mutex(fd)); }
|
|
|
|
int unlock_fd(int fd) { return pthread_mutex_unlock(get_mutex(fd)); }
|
|
|
|
int lock_file(FILE *f)
|
|
{
|
|
assert(f);
|
|
return lock_fd(fileno(f));
|
|
}
|
|
|
|
int unlock_file(FILE *f)
|
|
{
|
|
assert(f);
|
|
return unlock_fd(fileno(f));
|
|
}
|