126 lines
3.4 KiB
C
126 lines
3.4 KiB
C
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/*
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* Copyright (c) 1995 John Birrell <jb@cimlogic.com.au>.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by John Birrell.
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* 4. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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#include <signal.h>
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#include <stdio.h>
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#ifdef _THREAD_SAFE
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#include <pthread.h>
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#include "pthread_private.h"
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void
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_thread_flockfile(FILE * fp, char *fname, int lineno)
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{
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int fd, flags;
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int status;
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/* Block signals: */
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_thread_kern_sig_block(&status);
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if ((fd = fileno(fp)) >= 0) {
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if (fp->_flags & __SRW) {
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flags = FD_READ | FD_WRITE;
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} else {
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if (fp->_flags & __SWR) {
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flags = FD_WRITE;
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} else {
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flags = FD_READ;
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}
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}
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/* This might fail but POSIX doesn't give a damn. */
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_thread_fd_lock(fd, flags, NULL, fname, lineno);
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}
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/* Unblock signals: */
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_thread_kern_sig_unblock(status);
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return;
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}
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int
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_thread_ftrylockfile(FILE * fp)
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{
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int fd = 0;
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int flags;
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int status;
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if ((fd = fileno(fp)) >= 0) {
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/* Block signals: */
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_thread_kern_sig_block(&status);
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if (fp->_flags & __SRW) {
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flags = FD_READ | FD_WRITE;
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} else {
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if (fp->_flags & __SWR) {
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flags = FD_WRITE;
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} else {
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flags = FD_READ;
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}
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}
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if (!(_thread_fd_table[fd]->r_owner && _thread_fd_table[fd]->w_owner)) {
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_thread_fd_lock(fd, flags, NULL, __FILE__, __LINE__);
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fd = 0;
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} else {
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fd = -1;
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}
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/* Unblock signals: */
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_thread_kern_sig_unblock(status);
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}
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return (fd);
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}
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void
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_thread_funlockfile(FILE * fp)
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{
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int fd, flags;
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int status;
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if ((fd = fileno(fp)) >= 0) {
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/* Block signals: */
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_thread_kern_sig_block(&status);
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if (fp->_flags & __SRW) {
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flags = FD_READ | FD_WRITE;
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} else if (fp->_flags & __SWR) {
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flags = FD_WRITE;
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} else {
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flags = FD_READ;
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}
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_thread_fd_unlock(fd, flags);
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/* Unblock signals: */
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_thread_kern_sig_unblock(status);
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}
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return;
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}
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#endif
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