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255 lines
7.8 KiB
C
255 lines
7.8 KiB
C
/* ==== select.c ============================================================
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* Copyright (c) 1994 by Chris Provenzano, proven@mit.edu
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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 Chris Provenzano.
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* 4. The name of Chris Provenzano may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY CHRIS PROVENZANO ``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 CHRIS PROVENZANO BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* 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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* This code based on code contributed by
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* Peter Hofmann <peterh@prz.tu-berlin.d400.de>
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*
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* Description : Select.
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*
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* 1.23 94/04/26 proven
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* -Started coding this file.
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*/
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#ifndef lint
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static const char rcsid[] = "$Id$";
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#endif
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#include <string.h>
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#include <errno.h>
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#include <pthread.h>
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#include <sys/types.h>
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#include <sys/time.h>
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extern struct pthread_queue fd_wait_select;
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static struct timeval zero_timeout = { 0, 0 }; /* Moved by monty */
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/* ==========================================================================
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* select()
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*/
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int 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 real_exceptfds, real_readfds, real_writefds; /* mapped fd_sets */
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fd_set * real_readfds_p, * real_writefds_p, * real_exceptfds_p;
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fd_set read_locks, write_locks, rdwr_locks;
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struct timespec timeout_time, current_time;
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int i, j, ret = 0, got_all_locks = 1;
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struct pthread_select_data data;
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if (numfds > dtablesize) {
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numfds = dtablesize;
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}
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data.nfds = 0;
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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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/* Do this first */
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if (timeout) {
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machdep_gettimeofday(¤t_time);
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timeout_time.tv_sec = current_time.tv_sec + timeout->tv_sec;
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if ((timeout_time.tv_nsec = current_time.tv_nsec +
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(timeout->tv_usec * 1000)) > 1000000000) {
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timeout_time.tv_nsec -= 1000000000;
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timeout_time.tv_sec++;
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}
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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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FD_ZERO(&real_readfds);
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FD_ZERO(&real_writefds);
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FD_ZERO(&real_exceptfds);
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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))) ||
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(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)) != OK) {
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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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FD_SET(fd_table[i]->fd.i,&real_writefds);
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} else {
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if ((ret = fd_lock(i, FD_READ, NULL)) != OK) {
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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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if (readfds && FD_ISSET(i,readfds)) {
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FD_SET(fd_table[i]->fd.i, &real_readfds);
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}
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if (exceptfds && FD_ISSET(i,exceptfds)) {
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FD_SET(fd_table[i]->fd.i, &real_exceptfds);
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}
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if (fd_table[i]->fd.i >= data.nfds) {
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data.nfds = fd_table[i]->fd.i + 1;
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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)) != OK) {
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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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FD_SET(fd_table[i]->fd.i,&real_writefds);
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if (fd_table[i]->fd.i >= data.nfds) {
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data.nfds = fd_table[i]->fd.i + 1;
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}
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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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{
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memcpy(&data.readfds,&real_readfds,sizeof(fd_set));
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memcpy(&data.writefds,&real_writefds,sizeof(fd_set));
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memcpy(&data.exceptfds,&real_exceptfds,sizeof(fd_set));
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real_readfds_p = (readfds == NULL) ? NULL : &real_readfds;
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real_writefds_p = (writefds == NULL) ? NULL : &real_writefds;
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real_exceptfds_p = (exceptfds == NULL) ? NULL : &real_exceptfds;
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pthread_run->sighandled=0;
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if ((ret = machdep_sys_select(data.nfds, real_readfds_p,
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real_writefds_p, real_exceptfds_p,
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&zero_timeout)) == OK) {
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pthread_sched_prevent();
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real_exceptfds_p = (exceptfds == NULL) ? NULL : &data.exceptfds;
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real_writefds_p = (writefds == NULL) ? NULL : &data.writefds;
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real_readfds_p = (readfds == NULL) ? NULL : &data.readfds;
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pthread_queue_enq(&fd_wait_select, pthread_run);
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pthread_run->data.select_data = &data;
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SET_PF_WAIT_EVENT(pthread_run);
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if (timeout) {
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machdep_gettimeofday(¤t_time);
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sleep_schedule(¤t_time, &timeout_time);
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SET_PF_AT_CANCEL_POINT(pthread_run);
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pthread_resched_resume(PS_SELECT_WAIT);
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CLEAR_PF_AT_CANCEL_POINT(pthread_run);
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/* We're awake */
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if (sleep_cancel(pthread_run) == NOTOK) {
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ret = OK;
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}
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else
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{
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int count = 0;
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for (i = 0; i < numfds; i++)
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{
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if (real_readfds_p && (FD_ISSET(i, real_readfds_p)))
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count++;
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if (real_writefds_p && (FD_ISSET(i, real_writefds_p)))
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count++;
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if (real_exceptfds_p && (FD_ISSET(i, real_exceptfds_p)))
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count++;
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}
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ret = count;
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}
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/* Moving this after the sleep_cancel() seemed
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* to fix intermittent crashes during heavy
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* socket use. (mevans)
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*/
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CLEAR_PF_DONE_EVENT(pthread_run);
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} else {
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int count = 0;
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SET_PF_AT_CANCEL_POINT(pthread_run);
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pthread_resched_resume(PS_SELECT_WAIT);
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CLEAR_PF_AT_CANCEL_POINT(pthread_run);
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CLEAR_PF_DONE_EVENT(pthread_run);
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for (i = 0; i < numfds; i++)
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{
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if (real_readfds_p && (FD_ISSET(i, real_readfds_p)))
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count++;
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if (real_writefds_p && (FD_ISSET(i, real_writefds_p)))
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count++;
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if (real_exceptfds_p && (FD_ISSET(i, real_exceptfds_p)))
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count++;
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}
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ret = count;
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}
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if (pthread_run->sighandled) /* Added by monty */
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{ /* We where aborted */
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ret= NOTOK;
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SET_ERRNO(EINTR);
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}
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} else if (ret < 0) {
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SET_ERRNO(-ret);
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ret = NOTOK;
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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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{ /* Changed by monty */
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if (FD_ISSET(i,&read_locks)) fd_unlock(i,FD_READ);
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if (FD_ISSET(i,&rdwr_locks)) fd_unlock(i,FD_RDWR);
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if (FD_ISSET(i,&write_locks)) fd_unlock(i,FD_WRITE);
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}
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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(fd_table[i]->fd.i,real_readfds_p)))
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FD_CLR(i,readfds);
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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(fd_table[i]->fd.i,real_writefds_p)))
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FD_CLR(i,writefds);
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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(fd_table[i]->fd.i,real_exceptfds_p)))
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FD_CLR(i,exceptfds);
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}
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} else {
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if (exceptfds != NULL) FD_ZERO(exceptfds);
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if (writefds != NULL) FD_ZERO(writefds);
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if (readfds != NULL) FD_ZERO(readfds);
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}
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return(ret);
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}
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