diff options
Diffstat (limited to 'mit-pthreads/pthreads/select.c')
| -rw-r--r-- | mit-pthreads/pthreads/select.c | 255 |
1 files changed, 0 insertions, 255 deletions
diff --git a/mit-pthreads/pthreads/select.c b/mit-pthreads/pthreads/select.c deleted file mode 100644 index eaafce31f19..00000000000 --- a/mit-pthreads/pthreads/select.c +++ /dev/null @@ -1,255 +0,0 @@ -/* ==== select.c ============================================================ - * Copyright (c) 1994 by Chris Provenzano, proven@mit.edu - * All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. All advertising materials mentioning features or use of this software - * must display the following acknowledgement: - * This product includes software developed by Chris Provenzano. - * 4. The name of Chris Provenzano may not be used to endorse or promote - * products derived from this software without specific prior written - * permission. - * - * THIS SOFTWARE IS PROVIDED BY CHRIS PROVENZANO ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL CHRIS PROVENZANO BE LIABLE FOR ANY - * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES - * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR - * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER - * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - * - * This code based on code contributed by - * Peter Hofmann <peterh@prz.tu-berlin.d400.de> - * - * Description : Select. - * - * 1.23 94/04/26 proven - * -Started coding this file. - */ - -#ifndef lint -static const char rcsid[] = "$Id$"; -#endif - -#include <string.h> -#include <errno.h> -#include <pthread.h> -#include <sys/types.h> -#include <sys/time.h> - -extern struct pthread_queue fd_wait_select; -static struct timeval zero_timeout = { 0, 0 }; /* Moved by monty */ - -/* ========================================================================== - * select() - */ -int select(int numfds, fd_set *readfds, fd_set *writefds, - fd_set *exceptfds, struct timeval *timeout) -{ - fd_set real_exceptfds, real_readfds, real_writefds; /* mapped fd_sets */ - fd_set * real_readfds_p, * real_writefds_p, * real_exceptfds_p; - fd_set read_locks, write_locks, rdwr_locks; - struct timespec timeout_time, current_time; - int i, j, ret = 0, got_all_locks = 1; - struct pthread_select_data data; - - if (numfds > dtablesize) { - numfds = dtablesize; - } - - data.nfds = 0; - FD_ZERO(&data.readfds); - FD_ZERO(&data.writefds); - FD_ZERO(&data.exceptfds); - - /* Do this first */ - if (timeout) { - machdep_gettimeofday(¤t_time); - timeout_time.tv_sec = current_time.tv_sec + timeout->tv_sec; - if ((timeout_time.tv_nsec = current_time.tv_nsec + - (timeout->tv_usec * 1000)) > 1000000000) { - timeout_time.tv_nsec -= 1000000000; - timeout_time.tv_sec++; - } - } - - FD_ZERO(&read_locks); - FD_ZERO(&write_locks); - FD_ZERO(&rdwr_locks); - FD_ZERO(&real_readfds); - FD_ZERO(&real_writefds); - FD_ZERO(&real_exceptfds); - - /* lock readfds */ - if (readfds || writefds || exceptfds) { - for (i = 0; i < numfds; i++) { - if ((readfds && (FD_ISSET(i, readfds))) || - (exceptfds && FD_ISSET(i, exceptfds))) { - if (writefds && FD_ISSET(i ,writefds)) { - if ((ret = fd_lock(i, FD_RDWR, NULL)) != OK) { - got_all_locks = 0; - break; - } - FD_SET(i, &rdwr_locks); - FD_SET(fd_table[i]->fd.i,&real_writefds); - } else { - if ((ret = fd_lock(i, FD_READ, NULL)) != OK) { - got_all_locks = 0; - break; - } - FD_SET(i, &read_locks); - } - if (readfds && FD_ISSET(i,readfds)) { - FD_SET(fd_table[i]->fd.i, &real_readfds); - } - if (exceptfds && FD_ISSET(i,exceptfds)) { - FD_SET(fd_table[i]->fd.i, &real_exceptfds); - } - if (fd_table[i]->fd.i >= data.nfds) { - data.nfds = fd_table[i]->fd.i + 1; - } - } else { - if (writefds && FD_ISSET(i, writefds)) { - if ((ret = fd_lock(i, FD_WRITE, NULL)) != OK) { - got_all_locks = 0; - break; - } - FD_SET(i, &write_locks); - FD_SET(fd_table[i]->fd.i,&real_writefds); - if (fd_table[i]->fd.i >= data.nfds) { - data.nfds = fd_table[i]->fd.i + 1; - } - } - } - } - } - - if (got_all_locks) - { - memcpy(&data.readfds,&real_readfds,sizeof(fd_set)); - memcpy(&data.writefds,&real_writefds,sizeof(fd_set)); - memcpy(&data.exceptfds,&real_exceptfds,sizeof(fd_set)); - - real_readfds_p = (readfds == NULL) ? NULL : &real_readfds; - real_writefds_p = (writefds == NULL) ? NULL : &real_writefds; - real_exceptfds_p = (exceptfds == NULL) ? NULL : &real_exceptfds; - - pthread_run->sighandled=0; - if ((ret = machdep_sys_select(data.nfds, real_readfds_p, - real_writefds_p, real_exceptfds_p, - &zero_timeout)) == OK) { - pthread_sched_prevent(); - - real_exceptfds_p = (exceptfds == NULL) ? NULL : &data.exceptfds; - real_writefds_p = (writefds == NULL) ? NULL : &data.writefds; - real_readfds_p = (readfds == NULL) ? NULL : &data.readfds; - - pthread_queue_enq(&fd_wait_select, pthread_run); - pthread_run->data.select_data = &data; - SET_PF_WAIT_EVENT(pthread_run); - - if (timeout) { - machdep_gettimeofday(¤t_time); - sleep_schedule(¤t_time, &timeout_time); - - SET_PF_AT_CANCEL_POINT(pthread_run); - pthread_resched_resume(PS_SELECT_WAIT); - CLEAR_PF_AT_CANCEL_POINT(pthread_run); - - /* We're awake */ - if (sleep_cancel(pthread_run) == NOTOK) { - ret = OK; - } - else - { - int count = 0; - for (i = 0; i < numfds; i++) - { - if (real_readfds_p && (FD_ISSET(i, real_readfds_p))) - count++; - if (real_writefds_p && (FD_ISSET(i, real_writefds_p))) - count++; - if (real_exceptfds_p && (FD_ISSET(i, real_exceptfds_p))) - count++; - } - ret = count; - } - /* Moving this after the sleep_cancel() seemed - * to fix intermittent crashes during heavy - * socket use. (mevans) - */ - CLEAR_PF_DONE_EVENT(pthread_run); - } else { - int count = 0; - SET_PF_AT_CANCEL_POINT(pthread_run); - pthread_resched_resume(PS_SELECT_WAIT); - CLEAR_PF_AT_CANCEL_POINT(pthread_run); - CLEAR_PF_DONE_EVENT(pthread_run); - for (i = 0; i < numfds; i++) - { - if (real_readfds_p && (FD_ISSET(i, real_readfds_p))) - count++; - if (real_writefds_p && (FD_ISSET(i, real_writefds_p))) - count++; - if (real_exceptfds_p && (FD_ISSET(i, real_exceptfds_p))) - count++; - } - ret = count; - } - if (pthread_run->sighandled) /* Added by monty */ - { /* We where aborted */ - ret= NOTOK; - SET_ERRNO(EINTR); - } - } else if (ret < 0) { - SET_ERRNO(-ret); - ret = NOTOK; - } - } - - /* clean up the locks */ - for (i = 0; i < numfds; i++) - { /* Changed by monty */ - if (FD_ISSET(i,&read_locks)) fd_unlock(i,FD_READ); - if (FD_ISSET(i,&rdwr_locks)) fd_unlock(i,FD_RDWR); - if (FD_ISSET(i,&write_locks)) fd_unlock(i,FD_WRITE); - } - if (ret > 0) { - if (readfds != NULL) { - for (i = 0; i < numfds; i++) { - if (! (FD_ISSET(i,readfds) && - FD_ISSET(fd_table[i]->fd.i,real_readfds_p))) - FD_CLR(i,readfds); - } - } - if (writefds != NULL) { - for (i = 0; i < numfds; i++) - if (! (FD_ISSET(i,writefds) && - FD_ISSET(fd_table[i]->fd.i,real_writefds_p))) - FD_CLR(i,writefds); - } - if (exceptfds != NULL) { - for (i = 0; i < numfds; i++) - if (! (FD_ISSET(i,exceptfds) && - FD_ISSET(fd_table[i]->fd.i,real_exceptfds_p))) - FD_CLR(i,exceptfds); - } - } else { - if (exceptfds != NULL) FD_ZERO(exceptfds); - if (writefds != NULL) FD_ZERO(writefds); - if (readfds != NULL) FD_ZERO(readfds); - } - - return(ret); -} |