ddc8afd422
line number every time a file descriptor is locked. This looks like a big change but it isn't. It should reduce the size of libc_r and make it run slightly faster.
178 lines
5.2 KiB
C
178 lines
5.2 KiB
C
/*
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* Copyright (c) 1995-1998 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 <unistd.h>
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#include <errno.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/time.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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int
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select(int numfds, fd_set * readfds, fd_set * writefds,
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fd_set * exceptfds, struct timeval * timeout)
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{
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fd_set read_locks, write_locks, rdwr_locks;
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struct timespec ts;
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struct timeval zero_timeout = {0, 0};
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int i, ret = 0, got_all_locks = 1;
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struct pthread_select_data data;
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if (numfds > _thread_dtablesize) {
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numfds = _thread_dtablesize;
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}
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/* Check if a timeout was specified: */
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if (timeout) {
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/* Convert the timeval to a timespec: */
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TIMEVAL_TO_TIMESPEC(timeout, &ts);
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/* Set the wake up time: */
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_thread_kern_set_timeout(&ts);
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} else {
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/* Wait for ever: */
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_thread_kern_set_timeout(NULL);
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}
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FD_ZERO(&read_locks);
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FD_ZERO(&write_locks);
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FD_ZERO(&rdwr_locks);
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/* lock readfds */
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if (readfds || writefds || exceptfds) {
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for (i = 0; i < numfds; i++) {
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if ((readfds && (FD_ISSET(i, readfds))) || (exceptfds && FD_ISSET(i, exceptfds))) {
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if (writefds && FD_ISSET(i, writefds)) {
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if ((ret = _FD_LOCK(i, FD_RDWR, NULL)) != 0) {
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got_all_locks = 0;
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break;
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}
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FD_SET(i, &rdwr_locks);
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} else {
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if ((ret = _FD_LOCK(i, FD_READ, NULL)) != 0) {
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got_all_locks = 0;
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break;
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}
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FD_SET(i, &read_locks);
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}
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} else {
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if (writefds && FD_ISSET(i, writefds)) {
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if ((ret = _FD_LOCK(i, FD_WRITE, NULL)) != 0) {
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got_all_locks = 0;
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break;
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}
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FD_SET(i, &write_locks);
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}
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}
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}
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}
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if (got_all_locks) {
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data.nfds = numfds;
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FD_ZERO(&data.readfds);
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FD_ZERO(&data.writefds);
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FD_ZERO(&data.exceptfds);
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if (readfds != NULL) {
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memcpy(&data.readfds, readfds, sizeof(data.readfds));
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}
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if (writefds != NULL) {
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memcpy(&data.writefds, writefds, sizeof(data.writefds));
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}
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if (exceptfds != NULL) {
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memcpy(&data.exceptfds, exceptfds, sizeof(data.exceptfds));
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}
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if ((ret = _thread_sys_select(data.nfds, &data.readfds, &data.writefds, &data.exceptfds, &zero_timeout)) == 0) {
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data.nfds = numfds;
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FD_ZERO(&data.readfds);
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FD_ZERO(&data.writefds);
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FD_ZERO(&data.exceptfds);
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if (readfds != NULL) {
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memcpy(&data.readfds, readfds, sizeof(data.readfds));
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}
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if (writefds != NULL) {
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memcpy(&data.writefds, writefds, sizeof(data.writefds));
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}
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if (exceptfds != NULL) {
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memcpy(&data.exceptfds, exceptfds, sizeof(data.exceptfds));
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}
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_thread_run->data.select_data = &data;
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_thread_run->interrupted = 0;
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_thread_kern_sched_state(PS_SELECT_WAIT, __FILE__, __LINE__);
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if (_thread_run->interrupted) {
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errno = EINTR;
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ret = -1;
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} else
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ret = data.nfds;
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}
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}
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/* clean up the locks */
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for (i = 0; i < numfds; i++)
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if (FD_ISSET(i, &read_locks))
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_FD_UNLOCK(i, FD_READ);
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for (i = 0; i < numfds; i++)
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if (FD_ISSET(i, &rdwr_locks))
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_FD_UNLOCK(i, FD_RDWR);
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for (i = 0; i < numfds; i++)
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if (FD_ISSET(i, &write_locks))
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_FD_UNLOCK(i, FD_WRITE);
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if (ret > 0) {
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if (readfds != NULL) {
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for (i = 0; i < numfds; i++) {
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if (FD_ISSET(i, readfds) &&
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!FD_ISSET(i, &data.readfds)) {
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FD_CLR(i, readfds);
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}
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}
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}
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if (writefds != NULL) {
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for (i = 0; i < numfds; i++) {
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if (FD_ISSET(i, writefds) &&
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!FD_ISSET(i, &data.writefds)) {
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FD_CLR(i, writefds);
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}
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}
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}
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if (exceptfds != NULL) {
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for (i = 0; i < numfds; i++) {
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if (FD_ISSET(i, exceptfds) &&
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!FD_ISSET(i, &data.exceptfds)) {
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FD_CLR(i, exceptfds);
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}
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}
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}
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}
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return (ret);
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}
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#endif
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