Squashed 'third_party/libevent/' content from commit d8ceae8
Change-Id: I84e1b23561eb225b9f288717b028e6bc9e5a27e1
git-subtree-dir: third_party/libevent
git-subtree-split: d8ceae81b83f3d0a56e2f41d4c429b2702a8e302
diff --git a/win32select.c b/win32select.c
new file mode 100644
index 0000000..1743b01
--- /dev/null
+++ b/win32select.c
@@ -0,0 +1,377 @@
+/*
+ * Copyright 2007-2012 Niels Provos and Nick Mathewson
+ * Copyright 2000-2007 Niels Provos <provos@citi.umich.edu>
+ * Copyright 2003 Michael A. Davis <mike@datanerds.net>
+ *
+ * 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. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 <winsock2.h>
+#include <windows.h>
+#include <sys/types.h>
+#include <sys/queue.h>
+#include <limits.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+
+#include "event2/util.h"
+#include "event2/event-config.h"
+#include "util-internal.h"
+#include "log-internal.h"
+#include "event2/event.h"
+#include "event-internal.h"
+#include "evmap-internal.h"
+#include "event2/thread.h"
+#include "evthread-internal.h"
+
+#define XFREE(ptr) do { if (ptr) mm_free(ptr); } while (0)
+
+extern struct event_list timequeue;
+extern struct event_list addqueue;
+
+struct win_fd_set {
+ u_int fd_count;
+ SOCKET fd_array[1];
+};
+
+/* MSDN says this is required to handle SIGFPE */
+volatile double SIGFPE_REQ = 0.0f;
+
+struct idx_info {
+ int read_pos_plus1;
+ int write_pos_plus1;
+};
+
+struct win32op {
+ unsigned num_fds_in_fd_sets;
+ int resize_out_sets;
+ struct win_fd_set *readset_in;
+ struct win_fd_set *writeset_in;
+ struct win_fd_set *readset_out;
+ struct win_fd_set *writeset_out;
+ struct win_fd_set *exset_out;
+ unsigned signals_are_broken : 1;
+};
+
+static void *win32_init(struct event_base *);
+static int win32_add(struct event_base *, evutil_socket_t, short old, short events, void *_idx);
+static int win32_del(struct event_base *, evutil_socket_t, short old, short events, void *_idx);
+static int win32_dispatch(struct event_base *base, struct timeval *);
+static void win32_dealloc(struct event_base *);
+
+struct eventop win32ops = {
+ "win32",
+ win32_init,
+ win32_add,
+ win32_del,
+ win32_dispatch,
+ win32_dealloc,
+ 0, /* doesn't need reinit */
+ 0, /* No features supported. */
+ sizeof(struct idx_info),
+};
+
+#define FD_SET_ALLOC_SIZE(n) ((sizeof(struct win_fd_set) + ((n)-1)*sizeof(SOCKET)))
+
+static int
+grow_fd_sets(struct win32op *op, unsigned new_num_fds)
+{
+ size_t size;
+
+ EVUTIL_ASSERT(new_num_fds >= op->readset_in->fd_count &&
+ new_num_fds >= op->writeset_in->fd_count);
+ EVUTIL_ASSERT(new_num_fds >= 1);
+
+ size = FD_SET_ALLOC_SIZE(new_num_fds);
+ if (!(op->readset_in = mm_realloc(op->readset_in, size)))
+ return (-1);
+ if (!(op->writeset_in = mm_realloc(op->writeset_in, size)))
+ return (-1);
+ op->resize_out_sets = 1;
+ op->num_fds_in_fd_sets = new_num_fds;
+ return (0);
+}
+
+static int
+do_fd_set(struct win32op *op, struct idx_info *ent, evutil_socket_t s, int read)
+{
+ struct win_fd_set *set = read ? op->readset_in : op->writeset_in;
+ if (read) {
+ if (ent->read_pos_plus1 > 0)
+ return (0);
+ } else {
+ if (ent->write_pos_plus1 > 0)
+ return (0);
+ }
+ if (set->fd_count == op->num_fds_in_fd_sets) {
+ if (grow_fd_sets(op, op->num_fds_in_fd_sets*2))
+ return (-1);
+ /* set pointer will have changed and needs reiniting! */
+ set = read ? op->readset_in : op->writeset_in;
+ }
+ set->fd_array[set->fd_count] = s;
+ if (read)
+ ent->read_pos_plus1 = set->fd_count+1;
+ else
+ ent->write_pos_plus1 = set->fd_count+1;
+ return (set->fd_count++);
+}
+
+static int
+do_fd_clear(struct event_base *base,
+ struct win32op *op, struct idx_info *ent, int read)
+{
+ int i;
+ struct win_fd_set *set = read ? op->readset_in : op->writeset_in;
+ if (read) {
+ i = ent->read_pos_plus1 - 1;
+ ent->read_pos_plus1 = 0;
+ } else {
+ i = ent->write_pos_plus1 - 1;
+ ent->write_pos_plus1 = 0;
+ }
+ if (i < 0)
+ return (0);
+ if (--set->fd_count != (unsigned)i) {
+ struct idx_info *ent2;
+ SOCKET s2;
+ s2 = set->fd_array[i] = set->fd_array[set->fd_count];
+
+ ent2 = evmap_io_get_fdinfo(&base->io, s2);
+
+ if (!ent2) /* This indicates a bug. */
+ return (0);
+ if (read)
+ ent2->read_pos_plus1 = i+1;
+ else
+ ent2->write_pos_plus1 = i+1;
+ }
+ return (0);
+}
+
+#define NEVENT 32
+void *
+win32_init(struct event_base *_base)
+{
+ struct win32op *winop;
+ size_t size;
+ if (!(winop = mm_calloc(1, sizeof(struct win32op))))
+ return NULL;
+ winop->num_fds_in_fd_sets = NEVENT;
+ size = FD_SET_ALLOC_SIZE(NEVENT);
+ if (!(winop->readset_in = mm_malloc(size)))
+ goto err;
+ if (!(winop->writeset_in = mm_malloc(size)))
+ goto err;
+ if (!(winop->readset_out = mm_malloc(size)))
+ goto err;
+ if (!(winop->writeset_out = mm_malloc(size)))
+ goto err;
+ if (!(winop->exset_out = mm_malloc(size)))
+ goto err;
+ winop->readset_in->fd_count = winop->writeset_in->fd_count = 0;
+ winop->readset_out->fd_count = winop->writeset_out->fd_count
+ = winop->exset_out->fd_count = 0;
+
+ if (evsig_init(_base) < 0)
+ winop->signals_are_broken = 1;
+
+ return (winop);
+ err:
+ XFREE(winop->readset_in);
+ XFREE(winop->writeset_in);
+ XFREE(winop->readset_out);
+ XFREE(winop->writeset_out);
+ XFREE(winop->exset_out);
+ XFREE(winop);
+ return (NULL);
+}
+
+int
+win32_add(struct event_base *base, evutil_socket_t fd,
+ short old, short events, void *_idx)
+{
+ struct win32op *win32op = base->evbase;
+ struct idx_info *idx = _idx;
+
+ if ((events & EV_SIGNAL) && win32op->signals_are_broken)
+ return (-1);
+
+ if (!(events & (EV_READ|EV_WRITE)))
+ return (0);
+
+ event_debug(("%s: adding event for %d", __func__, (int)fd));
+ if (events & EV_READ) {
+ if (do_fd_set(win32op, idx, fd, 1)<0)
+ return (-1);
+ }
+ if (events & EV_WRITE) {
+ if (do_fd_set(win32op, idx, fd, 0)<0)
+ return (-1);
+ }
+ return (0);
+}
+
+int
+win32_del(struct event_base *base, evutil_socket_t fd, short old, short events,
+ void *_idx)
+{
+ struct win32op *win32op = base->evbase;
+ struct idx_info *idx = _idx;
+
+ event_debug(("%s: Removing event for "EV_SOCK_FMT,
+ __func__, EV_SOCK_ARG(fd)));
+ if (events & EV_READ)
+ do_fd_clear(base, win32op, idx, 1);
+ if (events & EV_WRITE)
+ do_fd_clear(base, win32op, idx, 0);
+
+ return 0;
+}
+
+static void
+fd_set_copy(struct win_fd_set *out, const struct win_fd_set *in)
+{
+ out->fd_count = in->fd_count;
+ memcpy(out->fd_array, in->fd_array, in->fd_count * (sizeof(SOCKET)));
+}
+
+/*
+ static void dump_fd_set(struct win_fd_set *s)
+ {
+ unsigned int i;
+ printf("[ ");
+ for(i=0;i<s->fd_count;++i)
+ printf("%d ",(int)s->fd_array[i]);
+ printf("]\n");
+ }
+*/
+
+int
+win32_dispatch(struct event_base *base, struct timeval *tv)
+{
+ struct win32op *win32op = base->evbase;
+ int res = 0;
+ unsigned j, i;
+ int fd_count;
+ SOCKET s;
+
+ if (win32op->resize_out_sets) {
+ size_t size = FD_SET_ALLOC_SIZE(win32op->num_fds_in_fd_sets);
+ if (!(win32op->readset_out = mm_realloc(win32op->readset_out, size)))
+ return (-1);
+ if (!(win32op->exset_out = mm_realloc(win32op->exset_out, size)))
+ return (-1);
+ if (!(win32op->writeset_out = mm_realloc(win32op->writeset_out, size)))
+ return (-1);
+ win32op->resize_out_sets = 0;
+ }
+
+ fd_set_copy(win32op->readset_out, win32op->readset_in);
+ fd_set_copy(win32op->exset_out, win32op->writeset_in);
+ fd_set_copy(win32op->writeset_out, win32op->writeset_in);
+
+ fd_count =
+ (win32op->readset_out->fd_count > win32op->writeset_out->fd_count) ?
+ win32op->readset_out->fd_count : win32op->writeset_out->fd_count;
+
+ if (!fd_count) {
+ long msec = tv ? evutil_tv_to_msec(tv) : LONG_MAX;
+ /* Sleep's DWORD argument is unsigned long */
+ if (msec < 0)
+ msec = LONG_MAX;
+ /* Windows doesn't like you to call select() with no sockets */
+ Sleep(msec);
+ return (0);
+ }
+
+ EVBASE_RELEASE_LOCK(base, th_base_lock);
+
+ res = select(fd_count,
+ (struct fd_set*)win32op->readset_out,
+ (struct fd_set*)win32op->writeset_out,
+ (struct fd_set*)win32op->exset_out, tv);
+
+ EVBASE_ACQUIRE_LOCK(base, th_base_lock);
+
+ event_debug(("%s: select returned %d", __func__, res));
+
+ if (res <= 0) {
+ return res;
+ }
+
+ if (win32op->readset_out->fd_count) {
+ i = rand() % win32op->readset_out->fd_count;
+ for (j=0; j<win32op->readset_out->fd_count; ++j) {
+ if (++i >= win32op->readset_out->fd_count)
+ i = 0;
+ s = win32op->readset_out->fd_array[i];
+ evmap_io_active(base, s, EV_READ);
+ }
+ }
+ if (win32op->exset_out->fd_count) {
+ i = rand() % win32op->exset_out->fd_count;
+ for (j=0; j<win32op->exset_out->fd_count; ++j) {
+ if (++i >= win32op->exset_out->fd_count)
+ i = 0;
+ s = win32op->exset_out->fd_array[i];
+ evmap_io_active(base, s, EV_WRITE);
+ }
+ }
+ if (win32op->writeset_out->fd_count) {
+ SOCKET s;
+ i = rand() % win32op->writeset_out->fd_count;
+ for (j=0; j<win32op->writeset_out->fd_count; ++j) {
+ if (++i >= win32op->writeset_out->fd_count)
+ i = 0;
+ s = win32op->writeset_out->fd_array[i];
+ evmap_io_active(base, s, EV_WRITE);
+ }
+ }
+ return (0);
+}
+
+void
+win32_dealloc(struct event_base *_base)
+{
+ struct win32op *win32op = _base->evbase;
+
+ evsig_dealloc(_base);
+ if (win32op->readset_in)
+ mm_free(win32op->readset_in);
+ if (win32op->writeset_in)
+ mm_free(win32op->writeset_in);
+ if (win32op->readset_out)
+ mm_free(win32op->readset_out);
+ if (win32op->writeset_out)
+ mm_free(win32op->writeset_out);
+ if (win32op->exset_out)
+ mm_free(win32op->exset_out);
+ /* XXXXX free the tree. */
+
+ memset(win32op, 0, sizeof(*win32op));
+ mm_free(win32op);
+}