diff options
Diffstat (limited to 'nsprpub/pr/src/md/unix/uxpoll.c')
| -rw-r--r-- | nsprpub/pr/src/md/unix/uxpoll.c | 676 |
1 files changed, 676 insertions, 0 deletions
diff --git a/nsprpub/pr/src/md/unix/uxpoll.c b/nsprpub/pr/src/md/unix/uxpoll.c new file mode 100644 index 000000000..8a618ed80 --- /dev/null +++ b/nsprpub/pr/src/md/unix/uxpoll.c @@ -0,0 +1,676 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#if defined(_PR_PTHREADS) + +#error "This file should not be compiled" + +#else /* defined(_PR_PTHREADS) */ + +#include "primpl.h" + +#include <sys/time.h> + +#include <fcntl.h> +#ifdef _PR_USE_POLL +#include <poll.h> +#endif + +#if defined(_PR_USE_POLL) +static PRInt32 NativeThreadPoll( + PRPollDesc *pds, PRIntn npds, PRIntervalTime timeout) +{ + /* + * This function is mostly duplicated from ptio.s's PR_Poll(). + */ + PRInt32 ready = 0; + /* + * For restarting poll() if it is interrupted by a signal. + * We use these variables to figure out how much time has + * elapsed and how much of the timeout still remains. + */ + PRIntn index, msecs; + struct pollfd *syspoll = NULL; + PRIntervalTime start, elapsed, remaining; + + syspoll = (struct pollfd*)PR_MALLOC(npds * sizeof(struct pollfd)); + if (NULL == syspoll) + { + PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0); + return -1; + } + for (index = 0; index < npds; ++index) + { + PRFileDesc *bottom; + PRInt16 in_flags_read = 0, in_flags_write = 0; + PRInt16 out_flags_read = 0, out_flags_write = 0; + + if ((NULL != pds[index].fd) && (0 != pds[index].in_flags)) + { + if (pds[index].in_flags & PR_POLL_READ) + { + in_flags_read = (pds[index].fd->methods->poll)( + pds[index].fd, + pds[index].in_flags & ~PR_POLL_WRITE, + &out_flags_read); + } + if (pds[index].in_flags & PR_POLL_WRITE) + { + in_flags_write = (pds[index].fd->methods->poll)( + pds[index].fd, + pds[index].in_flags & ~PR_POLL_READ, + &out_flags_write); + } + if ((0 != (in_flags_read & out_flags_read)) + || (0 != (in_flags_write & out_flags_write))) + { + /* this one is ready right now */ + if (0 == ready) + { + /* + * We will return without calling the system + * poll function. So zero the out_flags + * fields of all the poll descriptors before + * this one. + */ + int i; + for (i = 0; i < index; i++) + { + pds[i].out_flags = 0; + } + } + ready += 1; + pds[index].out_flags = out_flags_read | out_flags_write; + } + else + { + pds[index].out_flags = 0; /* pre-condition */ + /* now locate the NSPR layer at the bottom of the stack */ + bottom = PR_GetIdentitiesLayer(pds[index].fd, PR_NSPR_IO_LAYER); + PR_ASSERT(NULL != bottom); /* what to do about that? */ + if ((NULL != bottom) + && (_PR_FILEDESC_OPEN == bottom->secret->state)) + { + if (0 == ready) + { + syspoll[index].fd = bottom->secret->md.osfd; + syspoll[index].events = 0; /* pre-condition */ + if (in_flags_read & PR_POLL_READ) + { + pds[index].out_flags |= + _PR_POLL_READ_SYS_READ; + syspoll[index].events |= POLLIN; + } + if (in_flags_read & PR_POLL_WRITE) + { + pds[index].out_flags |= + _PR_POLL_READ_SYS_WRITE; + syspoll[index].events |= POLLOUT; + } + if (in_flags_write & PR_POLL_READ) + { + pds[index].out_flags |= + _PR_POLL_WRITE_SYS_READ; + syspoll[index].events |= POLLIN; + } + if (in_flags_write & PR_POLL_WRITE) + { + pds[index].out_flags |= + _PR_POLL_WRITE_SYS_WRITE; + syspoll[index].events |= POLLOUT; + } + if (pds[index].in_flags & PR_POLL_EXCEPT) + syspoll[index].events |= POLLPRI; + } + } + else + { + if (0 == ready) + { + int i; + for (i = 0; i < index; i++) + { + pds[i].out_flags = 0; + } + } + ready += 1; /* this will cause an abrupt return */ + pds[index].out_flags = PR_POLL_NVAL; /* bogii */ + } + } + } + else + { + /* make poll() ignore this entry */ + syspoll[index].fd = -1; + syspoll[index].events = 0; + pds[index].out_flags = 0; + } + } + + if (0 == ready) + { + switch (timeout) + { + case PR_INTERVAL_NO_WAIT: msecs = 0; break; + case PR_INTERVAL_NO_TIMEOUT: msecs = -1; break; + default: + msecs = PR_IntervalToMilliseconds(timeout); + start = PR_IntervalNow(); + } + +retry: + ready = _MD_POLL(syspoll, npds, msecs); + if (-1 == ready) + { + PRIntn oserror = errno; + + if (EINTR == oserror) + { + if (timeout == PR_INTERVAL_NO_TIMEOUT) goto retry; + else if (timeout == PR_INTERVAL_NO_WAIT) ready = 0; + else + { + elapsed = (PRIntervalTime)(PR_IntervalNow() - start); + if (elapsed > timeout) ready = 0; /* timed out */ + else + { + remaining = timeout - elapsed; + msecs = PR_IntervalToMilliseconds(remaining); + goto retry; + } + } + } + else _PR_MD_MAP_POLL_ERROR(oserror); + } + else if (ready > 0) + { + for (index = 0; index < npds; ++index) + { + PRInt16 out_flags = 0; + if ((NULL != pds[index].fd) && (0 != pds[index].in_flags)) + { + if (0 != syspoll[index].revents) + { + /* + ** Set up the out_flags so that it contains the + ** bits that the highest layer thinks are nice + ** to have. Then the client of that layer will + ** call the appropriate I/O function and maybe + ** the protocol will make progress. + */ + if (syspoll[index].revents & POLLIN) + { + if (pds[index].out_flags + & _PR_POLL_READ_SYS_READ) + { + out_flags |= PR_POLL_READ; + } + if (pds[index].out_flags + & _PR_POLL_WRITE_SYS_READ) + { + out_flags |= PR_POLL_WRITE; + } + } + if (syspoll[index].revents & POLLOUT) + { + if (pds[index].out_flags + & _PR_POLL_READ_SYS_WRITE) + { + out_flags |= PR_POLL_READ; + } + if (pds[index].out_flags + & _PR_POLL_WRITE_SYS_WRITE) + { + out_flags |= PR_POLL_WRITE; + } + } + if (syspoll[index].revents & POLLPRI) + out_flags |= PR_POLL_EXCEPT; + if (syspoll[index].revents & POLLERR) + out_flags |= PR_POLL_ERR; + if (syspoll[index].revents & POLLNVAL) + out_flags |= PR_POLL_NVAL; + if (syspoll[index].revents & POLLHUP) + out_flags |= PR_POLL_HUP; + } + } + pds[index].out_flags = out_flags; + } + } + } + + PR_DELETE(syspoll); + return ready; + +} /* NativeThreadPoll */ +#endif /* defined(_PR_USE_POLL) */ + +#if !defined(_PR_USE_POLL) +static PRInt32 NativeThreadSelect( + PRPollDesc *pds, PRIntn npds, PRIntervalTime timeout) +{ + /* + * This code is almost a duplicate of w32poll.c's _PR_MD_PR_POLL(). + */ + fd_set rd, wt, ex; + PRFileDesc *bottom; + PRPollDesc *pd, *epd; + PRInt32 maxfd = -1, ready, err; + PRIntervalTime remaining, elapsed, start; + + struct timeval tv, *tvp = NULL; + + FD_ZERO(&rd); + FD_ZERO(&wt); + FD_ZERO(&ex); + + ready = 0; + for (pd = pds, epd = pd + npds; pd < epd; pd++) + { + PRInt16 in_flags_read = 0, in_flags_write = 0; + PRInt16 out_flags_read = 0, out_flags_write = 0; + + if ((NULL != pd->fd) && (0 != pd->in_flags)) + { + if (pd->in_flags & PR_POLL_READ) + { + in_flags_read = (pd->fd->methods->poll)( + pd->fd, pd->in_flags & ~PR_POLL_WRITE, &out_flags_read); + } + if (pd->in_flags & PR_POLL_WRITE) + { + in_flags_write = (pd->fd->methods->poll)( + pd->fd, pd->in_flags & ~PR_POLL_READ, &out_flags_write); + } + if ((0 != (in_flags_read & out_flags_read)) + || (0 != (in_flags_write & out_flags_write))) + { + /* this one's ready right now */ + if (0 == ready) + { + /* + * We will have to return without calling the + * system poll/select function. So zero the + * out_flags fields of all the poll descriptors + * before this one. + */ + PRPollDesc *prev; + for (prev = pds; prev < pd; prev++) + { + prev->out_flags = 0; + } + } + ready += 1; + pd->out_flags = out_flags_read | out_flags_write; + } + else + { + pd->out_flags = 0; /* pre-condition */ + + /* make sure this is an NSPR supported stack */ + bottom = PR_GetIdentitiesLayer(pd->fd, PR_NSPR_IO_LAYER); + PR_ASSERT(NULL != bottom); /* what to do about that? */ + if ((NULL != bottom) + && (_PR_FILEDESC_OPEN == bottom->secret->state)) + { + if (0 == ready) + { + PRInt32 osfd = bottom->secret->md.osfd; + if (osfd > maxfd) maxfd = osfd; + if (in_flags_read & PR_POLL_READ) + { + pd->out_flags |= _PR_POLL_READ_SYS_READ; + FD_SET(osfd, &rd); + } + if (in_flags_read & PR_POLL_WRITE) + { + pd->out_flags |= _PR_POLL_READ_SYS_WRITE; + FD_SET(osfd, &wt); + } + if (in_flags_write & PR_POLL_READ) + { + pd->out_flags |= _PR_POLL_WRITE_SYS_READ; + FD_SET(osfd, &rd); + } + if (in_flags_write & PR_POLL_WRITE) + { + pd->out_flags |= _PR_POLL_WRITE_SYS_WRITE; + FD_SET(osfd, &wt); + } + if (pd->in_flags & PR_POLL_EXCEPT) FD_SET(osfd, &ex); + } + } + else + { + if (0 == ready) + { + PRPollDesc *prev; + for (prev = pds; prev < pd; prev++) + { + prev->out_flags = 0; + } + } + ready += 1; /* this will cause an abrupt return */ + pd->out_flags = PR_POLL_NVAL; /* bogii */ + } + } + } + else + { + pd->out_flags = 0; + } + } + + if (0 != ready) return ready; /* no need to block */ + + remaining = timeout; + start = PR_IntervalNow(); + +retry: + if (timeout != PR_INTERVAL_NO_TIMEOUT) + { + PRInt32 ticksPerSecond = PR_TicksPerSecond(); + tv.tv_sec = remaining / ticksPerSecond; + tv.tv_usec = PR_IntervalToMicroseconds( remaining % ticksPerSecond ); + tvp = &tv; + } + + ready = _MD_SELECT(maxfd + 1, &rd, &wt, &ex, tvp); + + if (ready == -1 && errno == EINTR) + { + if (timeout == PR_INTERVAL_NO_TIMEOUT) goto retry; + else + { + elapsed = (PRIntervalTime) (PR_IntervalNow() - start); + if (elapsed > timeout) ready = 0; /* timed out */ + else + { + remaining = timeout - elapsed; + goto retry; + } + } + } + + /* + ** Now to unravel the select sets back into the client's poll + ** descriptor list. Is this possibly an area for pissing away + ** a few cycles or what? + */ + if (ready > 0) + { + ready = 0; + for (pd = pds, epd = pd + npds; pd < epd; pd++) + { + PRInt16 out_flags = 0; + if ((NULL != pd->fd) && (0 != pd->in_flags)) + { + PRInt32 osfd; + bottom = PR_GetIdentitiesLayer(pd->fd, PR_NSPR_IO_LAYER); + PR_ASSERT(NULL != bottom); + + osfd = bottom->secret->md.osfd; + + if (FD_ISSET(osfd, &rd)) + { + if (pd->out_flags & _PR_POLL_READ_SYS_READ) + out_flags |= PR_POLL_READ; + if (pd->out_flags & _PR_POLL_WRITE_SYS_READ) + out_flags |= PR_POLL_WRITE; + } + if (FD_ISSET(osfd, &wt)) + { + if (pd->out_flags & _PR_POLL_READ_SYS_WRITE) + out_flags |= PR_POLL_READ; + if (pd->out_flags & _PR_POLL_WRITE_SYS_WRITE) + out_flags |= PR_POLL_WRITE; + } + if (FD_ISSET(osfd, &ex)) out_flags |= PR_POLL_EXCEPT; + } + pd->out_flags = out_flags; + if (out_flags) ready++; + } + PR_ASSERT(ready > 0); + } + else if (ready < 0) + { + err = _MD_ERRNO(); + if (err == EBADF) + { + /* Find the bad fds */ + ready = 0; + for (pd = pds, epd = pd + npds; pd < epd; pd++) + { + pd->out_flags = 0; + if ((NULL != pd->fd) && (0 != pd->in_flags)) + { + bottom = PR_GetIdentitiesLayer(pd->fd, PR_NSPR_IO_LAYER); + if (fcntl(bottom->secret->md.osfd, F_GETFL, 0) == -1) + { + pd->out_flags = PR_POLL_NVAL; + ready++; + } + } + } + PR_ASSERT(ready > 0); + } + else _PR_MD_MAP_SELECT_ERROR(err); + } + + return ready; +} /* NativeThreadSelect */ +#endif /* !defined(_PR_USE_POLL) */ + +static PRInt32 LocalThreads( + PRPollDesc *pds, PRIntn npds, PRIntervalTime timeout) +{ + PRPollDesc *pd, *epd; + PRInt32 ready, pdcnt; + _PRUnixPollDesc *unixpds, *unixpd; + + /* + * XXX + * PRPollDesc has a PRFileDesc field, fd, while the IOQ + * is a list of PRPollQueue structures, each of which contains + * a _PRUnixPollDesc. A _PRUnixPollDesc struct contains + * the OS file descriptor, osfd, and not a PRFileDesc. + * So, we have allocate memory for _PRUnixPollDesc structures, + * copy the flags information from the pds list and have pq + * point to this list of _PRUnixPollDesc structures. + * + * It would be better if the memory allocation can be avoided. + */ + + unixpd = unixpds = (_PRUnixPollDesc*) + PR_MALLOC(npds * sizeof(_PRUnixPollDesc)); + if (NULL == unixpds) + { + PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0); + return -1; + } + + ready = 0; + for (pdcnt = 0, pd = pds, epd = pd + npds; pd < epd; pd++) + { + PRFileDesc *bottom; + PRInt16 in_flags_read = 0, in_flags_write = 0; + PRInt16 out_flags_read = 0, out_flags_write = 0; + + if ((NULL != pd->fd) && (0 != pd->in_flags)) + { + if (pd->in_flags & PR_POLL_READ) + { + in_flags_read = (pd->fd->methods->poll)( + pd->fd, pd->in_flags & ~PR_POLL_WRITE, &out_flags_read); + } + if (pd->in_flags & PR_POLL_WRITE) + { + in_flags_write = (pd->fd->methods->poll)( + pd->fd, pd->in_flags & ~PR_POLL_READ, &out_flags_write); + } + if ((0 != (in_flags_read & out_flags_read)) + || (0 != (in_flags_write & out_flags_write))) + { + /* this one's ready right now */ + if (0 == ready) + { + /* + * We will have to return without calling the + * system poll/select function. So zero the + * out_flags fields of all the poll descriptors + * before this one. + */ + PRPollDesc *prev; + for (prev = pds; prev < pd; prev++) + { + prev->out_flags = 0; + } + } + ready += 1; + pd->out_flags = out_flags_read | out_flags_write; + } + else + { + pd->out_flags = 0; /* pre-condition */ + bottom = PR_GetIdentitiesLayer(pd->fd, PR_NSPR_IO_LAYER); + PR_ASSERT(NULL != bottom); /* what to do about that? */ + if ((NULL != bottom) + && (_PR_FILEDESC_OPEN == bottom->secret->state)) + { + if (0 == ready) + { + unixpd->osfd = bottom->secret->md.osfd; + unixpd->in_flags = 0; + if (in_flags_read & PR_POLL_READ) + { + unixpd->in_flags |= _PR_UNIX_POLL_READ; + pd->out_flags |= _PR_POLL_READ_SYS_READ; + } + if (in_flags_read & PR_POLL_WRITE) + { + unixpd->in_flags |= _PR_UNIX_POLL_WRITE; + pd->out_flags |= _PR_POLL_READ_SYS_WRITE; + } + if (in_flags_write & PR_POLL_READ) + { + unixpd->in_flags |= _PR_UNIX_POLL_READ; + pd->out_flags |= _PR_POLL_WRITE_SYS_READ; + } + if (in_flags_write & PR_POLL_WRITE) + { + unixpd->in_flags |= _PR_UNIX_POLL_WRITE; + pd->out_flags |= _PR_POLL_WRITE_SYS_WRITE; + } + if ((in_flags_read | in_flags_write) & PR_POLL_EXCEPT) + { + unixpd->in_flags |= _PR_UNIX_POLL_EXCEPT; + } + unixpd++; pdcnt++; + } + } + else + { + if (0 == ready) + { + PRPollDesc *prev; + for (prev = pds; prev < pd; prev++) + { + prev->out_flags = 0; + } + } + ready += 1; /* this will cause an abrupt return */ + pd->out_flags = PR_POLL_NVAL; /* bogii */ + } + } + } + } + + if (0 != ready) + { + /* no need to block */ + PR_DELETE(unixpds); + return ready; + } + + ready = _PR_WaitForMultipleFDs(unixpds, pdcnt, timeout); + + /* + * Copy the out_flags from the _PRUnixPollDesc structures to the + * user's PRPollDesc structures and free the allocated memory + */ + unixpd = unixpds; + for (pd = pds, epd = pd + npds; pd < epd; pd++) + { + PRInt16 out_flags = 0; + if ((NULL != pd->fd) && (0 != pd->in_flags)) + { + /* + * take errors from the poll operation, + * the R/W bits from the request + */ + if (0 != unixpd->out_flags) + { + if (unixpd->out_flags & _PR_UNIX_POLL_READ) + { + if (pd->out_flags & _PR_POLL_READ_SYS_READ) + out_flags |= PR_POLL_READ; + if (pd->out_flags & _PR_POLL_WRITE_SYS_READ) + out_flags |= PR_POLL_WRITE; + } + if (unixpd->out_flags & _PR_UNIX_POLL_WRITE) + { + if (pd->out_flags & _PR_POLL_READ_SYS_WRITE) + out_flags |= PR_POLL_READ; + if (pd->out_flags & _PR_POLL_WRITE_SYS_WRITE) + out_flags |= PR_POLL_WRITE; + } + if (unixpd->out_flags & _PR_UNIX_POLL_EXCEPT) + out_flags |= PR_POLL_EXCEPT; + if (unixpd->out_flags & _PR_UNIX_POLL_ERR) + out_flags |= PR_POLL_ERR; + if (unixpd->out_flags & _PR_UNIX_POLL_NVAL) + out_flags |= PR_POLL_NVAL; + if (unixpd->out_flags & _PR_UNIX_POLL_HUP) + out_flags |= PR_POLL_HUP; + } + unixpd++; + } + pd->out_flags = out_flags; + } + + PR_DELETE(unixpds); + + return ready; +} /* LocalThreads */ + +#if defined(_PR_USE_POLL) +#define NativeThreads NativeThreadPoll +#else +#define NativeThreads NativeThreadSelect +#endif + +PRInt32 _MD_pr_poll(PRPollDesc *pds, PRIntn npds, PRIntervalTime timeout) +{ + PRInt32 rv = 0; + PRThread *me = _PR_MD_CURRENT_THREAD(); + + if (_PR_PENDING_INTERRUPT(me)) + { + me->flags &= ~_PR_INTERRUPT; + PR_SetError(PR_PENDING_INTERRUPT_ERROR, 0); + return -1; + } + if (0 == npds) PR_Sleep(timeout); + else if (_PR_IS_NATIVE_THREAD(me)) + rv = NativeThreads(pds, npds, timeout); + else rv = LocalThreads(pds, npds, timeout); + + return rv; +} /* _MD_pr_poll */ + +#endif /* defined(_PR_PTHREADS) */ + +/* uxpoll.c */ + |