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/*
* 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));
}
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