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