180 lines
5.3 KiB
C
180 lines
5.3 KiB
C
/*
|
|
* Copyright (c) 1995 John Birrell <jb@cimlogic.com.au>.
|
|
* 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 John Birrell.
|
|
* 4. Neither the name of the author nor the names of any co-contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``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 THE REGENTS OR CONTRIBUTORS 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.
|
|
*
|
|
*/
|
|
#include <unistd.h>
|
|
#include <errno.h>
|
|
#include <string.h>
|
|
#include <sys/types.h>
|
|
#include <sys/time.h>
|
|
#ifdef _THREAD_SAFE
|
|
#include <pthread.h>
|
|
#include "pthread_private.h"
|
|
|
|
int
|
|
select(int numfds, fd_set * readfds, fd_set * writefds,
|
|
fd_set * exceptfds, struct timeval * timeout)
|
|
{
|
|
fd_set read_locks, write_locks, rdwr_locks;
|
|
struct timespec ts;
|
|
struct timeval zero_timeout = {0, 0};
|
|
int i, ret = 0, got_all_locks = 1;
|
|
struct pthread_select_data data;
|
|
|
|
if (numfds > _thread_dtablesize) {
|
|
numfds = _thread_dtablesize;
|
|
}
|
|
/* Check if a timeout was specified: */
|
|
if (timeout) {
|
|
/* Convert the timeval to a timespec: */
|
|
TIMEVAL_TO_TIMESPEC(timeout, &ts);
|
|
|
|
/* Set the wake up time: */
|
|
_thread_kern_set_timeout(&ts);
|
|
} else {
|
|
/* Wait for ever: */
|
|
_thread_kern_set_timeout(NULL);
|
|
}
|
|
|
|
FD_ZERO(&read_locks);
|
|
FD_ZERO(&write_locks);
|
|
FD_ZERO(&rdwr_locks);
|
|
|
|
/* 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 = _thread_fd_lock(i, FD_RDWR, NULL, __FILE__, __LINE__)) != 0) {
|
|
got_all_locks = 0;
|
|
break;
|
|
}
|
|
FD_SET(i, &rdwr_locks);
|
|
} else {
|
|
if ((ret = _thread_fd_lock(i, FD_READ, NULL, __FILE__, __LINE__)) != 0) {
|
|
got_all_locks = 0;
|
|
break;
|
|
}
|
|
FD_SET(i, &read_locks);
|
|
}
|
|
} else {
|
|
if (writefds && FD_ISSET(i, writefds)) {
|
|
if ((ret = _thread_fd_lock(i, FD_WRITE, NULL, __FILE__, __LINE__)) != 0) {
|
|
got_all_locks = 0;
|
|
break;
|
|
}
|
|
FD_SET(i, &write_locks);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
if (got_all_locks) {
|
|
data.nfds = numfds;
|
|
FD_ZERO(&data.readfds);
|
|
FD_ZERO(&data.writefds);
|
|
FD_ZERO(&data.exceptfds);
|
|
if (readfds != NULL) {
|
|
memcpy(&data.readfds, readfds, sizeof(data.readfds));
|
|
}
|
|
if (writefds != NULL) {
|
|
memcpy(&data.writefds, writefds, sizeof(data.writefds));
|
|
}
|
|
if (exceptfds != NULL) {
|
|
memcpy(&data.exceptfds, exceptfds, sizeof(data.exceptfds));
|
|
}
|
|
if ((ret = _thread_sys_select(data.nfds, &data.readfds, &data.writefds, &data.exceptfds, &zero_timeout)) == 0) {
|
|
data.nfds = numfds;
|
|
FD_ZERO(&data.readfds);
|
|
FD_ZERO(&data.writefds);
|
|
FD_ZERO(&data.exceptfds);
|
|
if (readfds != NULL) {
|
|
memcpy(&data.readfds, readfds, sizeof(data.readfds));
|
|
}
|
|
if (writefds != NULL) {
|
|
memcpy(&data.writefds, writefds, sizeof(data.writefds));
|
|
}
|
|
if (exceptfds != NULL) {
|
|
memcpy(&data.exceptfds, exceptfds, sizeof(data.exceptfds));
|
|
}
|
|
_thread_run->data.select_data = &data;
|
|
_thread_kern_sched_state(PS_SELECT_WAIT, __FILE__, __LINE__);
|
|
ret = data.nfds;
|
|
}
|
|
}
|
|
/* clean up the locks */
|
|
for (i = 0; i < numfds; i++)
|
|
if (FD_ISSET(i, &read_locks))
|
|
_thread_fd_unlock(i, FD_READ);
|
|
for (i = 0; i < numfds; i++)
|
|
if (FD_ISSET(i, &rdwr_locks))
|
|
_thread_fd_unlock(i, FD_RDWR);
|
|
for (i = 0; i < numfds; i++)
|
|
if (FD_ISSET(i, &write_locks))
|
|
_thread_fd_unlock(i, FD_WRITE);
|
|
|
|
if (ret > 0) {
|
|
if (readfds != NULL) {
|
|
FD_ZERO(readfds);
|
|
for (i = 0; i < numfds; i++) {
|
|
if (FD_ISSET(i, &data.readfds)) {
|
|
FD_SET(i, readfds);
|
|
}
|
|
}
|
|
}
|
|
if (writefds != NULL) {
|
|
FD_ZERO(writefds);
|
|
for (i = 0; i < numfds; i++) {
|
|
if (FD_ISSET(i, &data.writefds)) {
|
|
FD_SET(i, writefds);
|
|
}
|
|
}
|
|
}
|
|
if (exceptfds != NULL) {
|
|
FD_ZERO(exceptfds);
|
|
for (i = 0; i < numfds; i++) {
|
|
if (FD_ISSET(i, &data.exceptfds)) {
|
|
FD_SET(i, exceptfds);
|
|
}
|
|
}
|
|
}
|
|
} else {
|
|
if (exceptfds != NULL)
|
|
FD_ZERO(exceptfds);
|
|
if (writefds != NULL)
|
|
FD_ZERO(writefds);
|
|
if (readfds != NULL)
|
|
FD_ZERO(readfds);
|
|
}
|
|
|
|
return (ret);
|
|
}
|
|
#endif
|