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Diffstat (limited to 'nsprpub/pr/src/md/windows/w32poll.c')
-rw-r--r--nsprpub/pr/src/md/windows/w32poll.c342
1 files changed, 342 insertions, 0 deletions
diff --git a/nsprpub/pr/src/md/windows/w32poll.c b/nsprpub/pr/src/md/windows/w32poll.c
new file mode 100644
index 0000000000..241c7e3e47
--- /dev/null
+++ b/nsprpub/pr/src/md/windows/w32poll.c
@@ -0,0 +1,342 @@
+/* -*- 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/. */
+
+/*
+ * This file implements _PR_MD_PR_POLL for Win32.
+ */
+
+/* The default value of FD_SETSIZE is 64. */
+#define FD_SETSIZE 1024
+
+#include "primpl.h"
+
+#if !defined(_PR_GLOBAL_THREADS_ONLY)
+
+struct select_data_s {
+ PRInt32 status;
+ PRInt32 error;
+ fd_set *rd, *wt, *ex;
+ const struct timeval *tv;
+};
+
+static void
+_PR_MD_select_thread(void *cdata)
+{
+ struct select_data_s *cd = (struct select_data_s *)cdata;
+
+ cd->status = select(0, cd->rd, cd->wt, cd->ex, cd->tv);
+
+ if (cd->status == SOCKET_ERROR) {
+ cd->error = WSAGetLastError();
+ }
+}
+
+int _PR_NTFiberSafeSelect(
+ int nfds,
+ fd_set *readfds,
+ fd_set *writefds,
+ fd_set *exceptfds,
+ const struct timeval *timeout)
+{
+ PRThread *me = _PR_MD_CURRENT_THREAD();
+ int ready;
+
+ if (_PR_IS_NATIVE_THREAD(me)) {
+ ready = _MD_SELECT(nfds, readfds, writefds, exceptfds, timeout);
+ }
+ else
+ {
+ /*
+ ** Creating a new thread on each call!!
+ ** I guess web server doesn't use non-block I/O.
+ */
+ PRThread *selectThread;
+ struct select_data_s data;
+ data.status = 0;
+ data.error = 0;
+ data.rd = readfds;
+ data.wt = writefds;
+ data.ex = exceptfds;
+ data.tv = timeout;
+
+ selectThread = PR_CreateThread(
+ PR_USER_THREAD, _PR_MD_select_thread, &data,
+ PR_PRIORITY_NORMAL, PR_GLOBAL_THREAD, PR_JOINABLE_THREAD, 0);
+ if (selectThread == NULL) {
+ return -1;
+ }
+
+ PR_JoinThread(selectThread);
+ ready = data.status;
+ if (ready == SOCKET_ERROR) {
+ WSASetLastError(data.error);
+ }
+ }
+ return ready;
+}
+
+#endif /* !defined(_PR_GLOBAL_THREADS_ONLY) */
+
+PRInt32 _PR_MD_PR_POLL(PRPollDesc *pds, PRIntn npds, PRIntervalTime timeout)
+{
+ int ready, err;
+ fd_set rd, wt, ex;
+ fd_set *rdp, *wtp, *exp;
+ int nrd, nwt, nex;
+ PRFileDesc *bottom;
+ PRPollDesc *pd, *epd;
+ PRThread *me = _PR_MD_CURRENT_THREAD();
+
+ struct timeval tv, *tvp = NULL;
+
+ if (_PR_PENDING_INTERRUPT(me))
+ {
+ me->flags &= ~_PR_INTERRUPT;
+ PR_SetError(PR_PENDING_INTERRUPT_ERROR, 0);
+ return -1;
+ }
+
+ /*
+ ** Is it an empty set? If so, just sleep for the timeout and return
+ */
+ if (0 == npds)
+ {
+ PR_Sleep(timeout);
+ return 0;
+ }
+
+ nrd = nwt = nex = 0;
+ FD_ZERO(&rd);
+ FD_ZERO(&wt);
+ FD_ZERO(&ex);
+
+ ready = 0;
+ for (pd = pds, epd = pd + npds; pd < epd; pd++)
+ {
+ SOCKET osfd;
+ 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, (PRInt16)(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, (PRInt16)(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 (buffered input) */
+ 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);
+ /* ignore a socket without PR_NSPR_IO_LAYER available */
+
+ if ((NULL != bottom)
+ && (_PR_FILEDESC_OPEN == bottom->secret->state))
+ {
+ if (0 == ready)
+ {
+ osfd = (SOCKET) bottom->secret->md.osfd;
+ if (in_flags_read & PR_POLL_READ)
+ {
+ pd->out_flags |= _PR_POLL_READ_SYS_READ;
+ FD_SET(osfd, &rd);
+ nrd++;
+ }
+ if (in_flags_read & PR_POLL_WRITE)
+ {
+ pd->out_flags |= _PR_POLL_READ_SYS_WRITE;
+ FD_SET(osfd, &wt);
+ nwt++;
+ }
+ if (in_flags_write & PR_POLL_READ)
+ {
+ pd->out_flags |= _PR_POLL_WRITE_SYS_READ;
+ FD_SET(osfd, &rd);
+ nrd++;
+ }
+ if (in_flags_write & PR_POLL_WRITE)
+ {
+ pd->out_flags |= _PR_POLL_WRITE_SYS_WRITE;
+ FD_SET(osfd, &wt);
+ nwt++;
+ }
+ if (pd->in_flags & PR_POLL_EXCEPT) {
+ FD_SET(osfd, &ex);
+ nex++;
+ }
+ }
+ }
+ 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 */
+ }
+
+ /*
+ * FD_SET does nothing if the fd_set's internal fd_array is full. If
+ * nrd, nwt, or nex is greater than FD_SETSIZE, we know FD_SET must
+ * have failed to insert an osfd into the corresponding fd_set, and
+ * therefore we should fail.
+ */
+ if ((nrd > FD_SETSIZE) || (nwt > FD_SETSIZE) || (nex > FD_SETSIZE)) {
+ PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
+ return -1;
+ }
+
+ rdp = (0 == nrd) ? NULL : &rd;
+ wtp = (0 == nwt) ? NULL : &wt;
+ exp = (0 == nex) ? NULL : &ex;
+
+ if ((NULL == rdp) && (NULL == wtp) && (NULL == exp)) {
+ PR_Sleep(timeout);
+ return 0;
+ }
+
+ if (timeout != PR_INTERVAL_NO_TIMEOUT)
+ {
+ PRInt32 ticksPerSecond = PR_TicksPerSecond();
+ tv.tv_sec = timeout / ticksPerSecond;
+ tv.tv_usec = PR_IntervalToMicroseconds( timeout % ticksPerSecond );
+ tvp = &tv;
+ }
+
+#if defined(_PR_GLOBAL_THREADS_ONLY)
+ ready = _MD_SELECT(0, rdp, wtp, exp, tvp);
+#else
+ ready = _PR_NTFiberSafeSelect(0, rdp, wtp, exp, tvp);
+#endif
+
+ /*
+ ** 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))
+ {
+ SOCKET osfd;
+ bottom = PR_GetIdentitiesLayer(pd->fd, PR_NSPR_IO_LAYER);
+ PR_ASSERT(NULL != bottom);
+
+ osfd = (SOCKET) 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 == SOCKET_ERROR)
+ {
+ err = WSAGetLastError();
+ if (err == WSAENOTSOCK)
+ {
+ /* Find the bad fds */
+ int optval;
+ int optlen = sizeof(optval);
+ 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 (getsockopt(bottom->secret->md.osfd, SOL_SOCKET,
+ SO_TYPE, (char *) &optval, &optlen) == -1)
+ {
+ PR_ASSERT(WSAGetLastError() == WSAENOTSOCK);
+ if (WSAGetLastError() == WSAENOTSOCK)
+ {
+ pd->out_flags = PR_POLL_NVAL;
+ ready++;
+ }
+ }
+ }
+ }
+ PR_ASSERT(ready > 0);
+ }
+ else {
+ _PR_MD_MAP_SELECT_ERROR(err);
+ }
+ }
+
+ return ready;
+}
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