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/*
* David Leonard <d@openbsd.org>, 1999. Public Domain.
*
* $OpenBSD: uthread_poll.c,v 1.2 1999/01/08 05:09:22 d Exp $
*/
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <sys/time.h>
#include <poll.h>
#include <stdlib.h>
#ifdef _THREAD_SAFE
#include <pthread.h>
#include "pthread_private.h"
static void
poll_helper(nfds, fds, data)
int nfds;
struct pollfd *fds;
struct pthread_select_data *data;
{
int maxfd;
int i;
int event;
int fd;
FD_ZERO(&data->readfds);
FD_ZERO(&data->writefds);
FD_ZERO(&data->exceptfds);
maxfd = -1;
for (i = 0; i < nfds; i++) {
event = fds[i].events;
fd = fds[i].fd;
if (event & POLLIN)
FD_SET(fd, &data->readfds);
if (event & POLLOUT)
FD_SET(fd, &data->writefds);
if (fd > maxfd)
maxfd = fd;
}
data->nfds = maxfd + 1;
}
int
poll(fds, nfds, timeout)
struct pollfd fds[];
int nfds;
int timeout;
{
fd_set rfds, wfds, rwfds;
int i;
struct timespec ts;
int fd, event;
struct pthread_select_data data;
struct timeval zero_timeout = { 0, 0 };
int ret;
if (timeout < 0) {
/* Wait forever: */
_thread_kern_set_timeout(NULL);
} else {
ts.tv_sec = timeout / 1000;
ts.tv_nsec = (timeout % 1000) * 1000000L;
_thread_kern_set_timeout(&ts);
}
/* Obtain locks needed: */
ret = 0;
FD_ZERO(&rfds);
FD_ZERO(&wfds);
FD_ZERO(&rwfds);
for (i = 0; i < nfds; i++) {
event = fds[i].events;
fd = fds[i].fd;
if (event & (POLLIN|POLLOUT))
if (!FD_ISSET(fd, &rwfds) && !FD_ISSET(fd, &rfds) &&
!FD_ISSET(fd, &wfds)) {
if ((ret = _FD_LOCK(fd, FD_RDWR, NULL)) != 0)
break;
FD_SET(fd, &rwfds);
continue;
}
if (event & POLLIN)
if (!FD_ISSET(fd, &rwfds) && !FD_ISSET(fd, &rfds)) {
if ((ret = _FD_LOCK(fd, FD_READ, NULL)) != 0)
break;
FD_SET(fd, &rfds);
}
if (event & POLLOUT)
if (!FD_ISSET(fd, &rwfds) && !FD_ISSET(fd, &wfds)) {
if ((ret = _FD_LOCK(fd, FD_WRITE, NULL)) != 0)
break;
FD_SET(fd, &wfds);
}
}
if (ret == 0) {
poll_helper(nfds, fds, &data);
ret = _thread_sys_select(data.nfds, &data.readfds,
&data.writefds, NULL, &zero_timeout);
if (ret == 0) {
poll_helper(nfds, fds, &data);
_thread_run->data.select_data = &data;
_thread_run->interrupted = 0;
_thread_kern_sched_state(PS_SELECT_WAIT, __FILE__, __LINE__);
if (_thread_run->interrupted) {
errno = EINTR;
ret = -1;
}
}
if (ret >= 0)
ret = _thread_sys_poll(fds, nfds, 0);
}
/* Clean up the locks: */
for (i = 0; i < nfds; i++) {
fd = fds[i].fd;
if (FD_ISSET(fd, &rwfds)) {
_FD_UNLOCK(fd, FD_RDWR);
FD_CLR(fd, &rwfds);
}
if (FD_ISSET(fd, &rfds)) {
_FD_UNLOCK(fd, FD_READ);
FD_CLR(fd, &rfds);
}
if (FD_ISSET(fd, &wfds)) {
_FD_UNLOCK(fd, FD_WRITE);
FD_CLR(fd, &wfds);
}
}
return (ret);
}
#endif
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