diff options
Diffstat (limited to 'lib/libpthread/thread/thr_select.c')
-rw-r--r-- | lib/libpthread/thread/thr_select.c | 174 |
1 files changed, 1 insertions, 173 deletions
diff --git a/lib/libpthread/thread/thr_select.c b/lib/libpthread/thread/thr_select.c index a041513..a4f4a15 100644 --- a/lib/libpthread/thread/thr_select.c +++ b/lib/libpthread/thread/thr_select.c @@ -46,185 +46,13 @@ __weak_reference(__select, select); int -_select(int numfds, fd_set * readfds, fd_set * writefds, fd_set * exceptfds, - struct timeval * timeout) -{ - struct pthread *curthread = _get_curthread(); - struct timespec ts; - int i, ret = 0, f_wait = 1; - int pfd_index, got_events = 0, fd_count = 0; - struct pthread_poll_data data; - - if (numfds > _thread_dtablesize) { - numfds = _thread_dtablesize; - } - /* Check if a timeout was specified: */ - if (timeout) { - if (timeout->tv_sec < 0 || - timeout->tv_usec < 0 || timeout->tv_usec >= 1000000) { - errno = EINVAL; - return (-1); - } - - /* Convert the timeval to a timespec: */ - TIMEVAL_TO_TIMESPEC(timeout, &ts); - - /* Set the wake up time: */ - _thread_kern_set_timeout(&ts); - if (ts.tv_sec == 0 && ts.tv_nsec == 0) - f_wait = 0; - } else { - /* Wait for ever: */ - _thread_kern_set_timeout(NULL); - } - - /* Count the number of file descriptors to be polled: */ - if (readfds || writefds || exceptfds) { - for (i = 0; i < numfds; i++) { - if ((readfds && FD_ISSET(i, readfds)) || - (exceptfds && FD_ISSET(i, exceptfds)) || - (writefds && FD_ISSET(i, writefds))) { - fd_count++; - } - } - } - - /* - * Allocate memory for poll data if it hasn't already been - * allocated or if previously allocated memory is insufficient. - */ - if ((curthread->poll_data.fds == NULL) || - (curthread->poll_data.nfds < fd_count)) { - data.fds = (struct pollfd *) realloc(curthread->poll_data.fds, - sizeof(struct pollfd) * MAX(128, fd_count)); - if (data.fds == NULL) { - errno = ENOMEM; - ret = -1; - } - else { - /* - * Note that the threads poll data always - * indicates what is allocated, not what is - * currently being polled. - */ - curthread->poll_data.fds = data.fds; - curthread->poll_data.nfds = MAX(128, fd_count); - } - } - if (ret == 0) { - /* Setup the wait data. */ - data.fds = curthread->poll_data.fds; - data.nfds = fd_count; - - /* - * Setup the array of pollfds. Optimize this by - * running the loop in reverse and stopping when - * the number of selected file descriptors is reached. - */ - for (i = numfds - 1, pfd_index = fd_count - 1; - (i >= 0) && (pfd_index >= 0); i--) { - data.fds[pfd_index].events = 0; - if (readfds && FD_ISSET(i, readfds)) { - data.fds[pfd_index].events = POLLRDNORM; - } - if (exceptfds && FD_ISSET(i, exceptfds)) { - data.fds[pfd_index].events |= POLLRDBAND; - } - if (writefds && FD_ISSET(i, writefds)) { - data.fds[pfd_index].events |= POLLWRNORM; - } - if (data.fds[pfd_index].events != 0) { - /* - * Set the file descriptor to be polled and - * clear revents in case of a timeout which - * leaves fds unchanged: - */ - data.fds[pfd_index].fd = i; - data.fds[pfd_index].revents = 0; - pfd_index--; - } - } - if (((ret = __sys_poll(data.fds, data.nfds, 0)) == 0) && - (f_wait != 0)) { - curthread->data.poll_data = &data; - curthread->interrupted = 0; - _thread_kern_sched_state(PS_SELECT_WAIT, __FILE__, __LINE__); - if (curthread->interrupted) { - errno = EINTR; - data.nfds = 0; - ret = -1; - } else - ret = data.nfds; - } - } - - if (ret >= 0) { - numfds = 0; - for (i = 0; i < fd_count; i++) { - /* - * Check the results of the poll and clear - * this file descriptor from the fdset if - * the requested event wasn't ready. - */ - - /* - * First check for invalid descriptor. - * If found, set errno and return -1. - */ - if (data.fds[i].revents & POLLNVAL) { - errno = EBADF; - return -1; - } - - got_events = 0; - if (readfds != NULL) { - if (FD_ISSET(data.fds[i].fd, readfds)) { - if ((data.fds[i].revents & (POLLIN - | POLLRDNORM | POLLERR - | POLLHUP | POLLNVAL)) != 0) - got_events++; - else - FD_CLR(data.fds[i].fd, readfds); - } - } - if (writefds != NULL) { - if (FD_ISSET(data.fds[i].fd, writefds)) { - if ((data.fds[i].revents & (POLLOUT - | POLLWRNORM | POLLWRBAND | POLLERR - | POLLHUP | POLLNVAL)) != 0) - got_events++; - else - FD_CLR(data.fds[i].fd, - writefds); - } - } - if (exceptfds != NULL) { - if (FD_ISSET(data.fds[i].fd, exceptfds)) { - if (data.fds[i].revents & (POLLRDBAND | - POLLPRI)) - got_events++; - else - FD_CLR(data.fds[i].fd, - exceptfds); - } - } - if (got_events != 0) - numfds+=got_events; - } - ret = numfds; - } - - return (ret); -} - -int __select(int numfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, struct timeval *timeout) { int ret; _thread_enter_cancellation_point(); - ret = _select(numfds, readfds, writefds, exceptfds, timeout); + ret = __sys_select(numfds, readfds, writefds, exceptfds, timeout); _thread_leave_cancellation_point(); return ret; |