381 lines
10 KiB
C
381 lines
10 KiB
C
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/* $NetBSD: win32select.c,v 1.1.1.1 2013/04/11 16:43:19 christos Exp $ */
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/*
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* Copyright 2007-2012 Niels Provos and Nick Mathewson
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* Copyright 2000-2007 Niels Provos <provos@citi.umich.edu>
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* Copyright 2003 Michael A. Davis <mike@datanerds.net>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <winsock2.h>
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#include <windows.h>
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#include <sys/types.h>
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#include <sys/queue.h>
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#include <limits.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include "event2/util.h"
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#include "event2/event-config.h"
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#include <sys/cdefs.h>
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__RCSID("$NetBSD: win32select.c,v 1.1.1.1 2013/04/11 16:43:19 christos Exp $");
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#include "util-internal.h"
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#include "log-internal.h"
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#include "event2/event.h"
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#include "event-internal.h"
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#include "evmap-internal.h"
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#include "event2/thread.h"
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#include "evthread-internal.h"
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#define XFREE(ptr) do { if (ptr) mm_free(ptr); } while (0)
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extern struct event_list timequeue;
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extern struct event_list addqueue;
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struct win_fd_set {
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u_int fd_count;
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SOCKET fd_array[1];
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};
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/* MSDN says this is required to handle SIGFPE */
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volatile double SIGFPE_REQ = 0.0f;
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struct idx_info {
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int read_pos_plus1;
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int write_pos_plus1;
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};
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struct win32op {
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unsigned num_fds_in_fd_sets;
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int resize_out_sets;
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struct win_fd_set *readset_in;
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struct win_fd_set *writeset_in;
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struct win_fd_set *readset_out;
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struct win_fd_set *writeset_out;
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struct win_fd_set *exset_out;
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unsigned signals_are_broken : 1;
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};
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static void *win32_init(struct event_base *);
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static int win32_add(struct event_base *, evutil_socket_t, short old, short events, void *_idx);
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static int win32_del(struct event_base *, evutil_socket_t, short old, short events, void *_idx);
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static int win32_dispatch(struct event_base *base, struct timeval *);
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static void win32_dealloc(struct event_base *);
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struct eventop win32ops = {
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"win32",
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win32_init,
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win32_add,
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win32_del,
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win32_dispatch,
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win32_dealloc,
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0, /* doesn't need reinit */
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0, /* No features supported. */
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sizeof(struct idx_info),
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};
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#define FD_SET_ALLOC_SIZE(n) ((sizeof(struct win_fd_set) + ((n)-1)*sizeof(SOCKET)))
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static int
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grow_fd_sets(struct win32op *op, unsigned new_num_fds)
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{
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size_t size;
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EVUTIL_ASSERT(new_num_fds >= op->readset_in->fd_count &&
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new_num_fds >= op->writeset_in->fd_count);
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EVUTIL_ASSERT(new_num_fds >= 1);
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size = FD_SET_ALLOC_SIZE(new_num_fds);
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if (!(op->readset_in = mm_realloc(op->readset_in, size)))
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return (-1);
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if (!(op->writeset_in = mm_realloc(op->writeset_in, size)))
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return (-1);
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op->resize_out_sets = 1;
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op->num_fds_in_fd_sets = new_num_fds;
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return (0);
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}
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static int
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do_fd_set(struct win32op *op, struct idx_info *ent, evutil_socket_t s, int read)
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{
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struct win_fd_set *set = read ? op->readset_in : op->writeset_in;
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if (read) {
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if (ent->read_pos_plus1 > 0)
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return (0);
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} else {
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if (ent->write_pos_plus1 > 0)
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return (0);
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}
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if (set->fd_count == op->num_fds_in_fd_sets) {
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if (grow_fd_sets(op, op->num_fds_in_fd_sets*2))
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return (-1);
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/* set pointer will have changed and needs reiniting! */
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set = read ? op->readset_in : op->writeset_in;
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}
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set->fd_array[set->fd_count] = s;
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if (read)
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ent->read_pos_plus1 = set->fd_count+1;
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else
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ent->write_pos_plus1 = set->fd_count+1;
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return (set->fd_count++);
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}
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static int
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do_fd_clear(struct event_base *base,
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struct win32op *op, struct idx_info *ent, int read)
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{
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int i;
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struct win_fd_set *set = read ? op->readset_in : op->writeset_in;
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if (read) {
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i = ent->read_pos_plus1 - 1;
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ent->read_pos_plus1 = 0;
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} else {
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i = ent->write_pos_plus1 - 1;
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ent->write_pos_plus1 = 0;
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}
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if (i < 0)
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return (0);
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if (--set->fd_count != (unsigned)i) {
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struct idx_info *ent2;
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SOCKET s2;
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s2 = set->fd_array[i] = set->fd_array[set->fd_count];
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ent2 = evmap_io_get_fdinfo(&base->io, s2);
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if (!ent2) /* This indicates a bug. */
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return (0);
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if (read)
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ent2->read_pos_plus1 = i+1;
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else
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ent2->write_pos_plus1 = i+1;
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}
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return (0);
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}
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#define NEVENT 32
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void *
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win32_init(struct event_base *_base)
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{
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struct win32op *winop;
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size_t size;
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if (!(winop = mm_calloc(1, sizeof(struct win32op))))
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return NULL;
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winop->num_fds_in_fd_sets = NEVENT;
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size = FD_SET_ALLOC_SIZE(NEVENT);
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if (!(winop->readset_in = mm_malloc(size)))
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goto err;
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if (!(winop->writeset_in = mm_malloc(size)))
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goto err;
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if (!(winop->readset_out = mm_malloc(size)))
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goto err;
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if (!(winop->writeset_out = mm_malloc(size)))
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goto err;
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if (!(winop->exset_out = mm_malloc(size)))
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goto err;
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winop->readset_in->fd_count = winop->writeset_in->fd_count = 0;
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winop->readset_out->fd_count = winop->writeset_out->fd_count
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= winop->exset_out->fd_count = 0;
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if (evsig_init(_base) < 0)
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winop->signals_are_broken = 1;
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return (winop);
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err:
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XFREE(winop->readset_in);
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XFREE(winop->writeset_in);
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XFREE(winop->readset_out);
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XFREE(winop->writeset_out);
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XFREE(winop->exset_out);
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XFREE(winop);
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return (NULL);
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}
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int
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win32_add(struct event_base *base, evutil_socket_t fd,
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short old, short events, void *_idx)
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{
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struct win32op *win32op = base->evbase;
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struct idx_info *idx = _idx;
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if ((events & EV_SIGNAL) && win32op->signals_are_broken)
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return (-1);
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if (!(events & (EV_READ|EV_WRITE)))
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return (0);
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event_debug(("%s: adding event for %d", __func__, (int)fd));
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if (events & EV_READ) {
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if (do_fd_set(win32op, idx, fd, 1)<0)
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return (-1);
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}
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if (events & EV_WRITE) {
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if (do_fd_set(win32op, idx, fd, 0)<0)
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return (-1);
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}
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return (0);
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}
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int
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win32_del(struct event_base *base, evutil_socket_t fd, short old, short events,
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void *_idx)
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{
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struct win32op *win32op = base->evbase;
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struct idx_info *idx = _idx;
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event_debug(("%s: Removing event for "EV_SOCK_FMT,
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__func__, EV_SOCK_ARG(fd)));
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if (events & EV_READ)
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do_fd_clear(base, win32op, idx, 1);
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if (events & EV_WRITE)
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do_fd_clear(base, win32op, idx, 0);
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return 0;
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}
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static void
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fd_set_copy(struct win_fd_set *out, const struct win_fd_set *in)
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{
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out->fd_count = in->fd_count;
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memcpy(out->fd_array, in->fd_array, in->fd_count * (sizeof(SOCKET)));
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}
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/*
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static void dump_fd_set(struct win_fd_set *s)
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{
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unsigned int i;
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printf("[ ");
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for(i=0;i<s->fd_count;++i)
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printf("%d ",(int)s->fd_array[i]);
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printf("]\n");
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}
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*/
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int
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win32_dispatch(struct event_base *base, struct timeval *tv)
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{
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struct win32op *win32op = base->evbase;
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int res = 0;
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unsigned j, i;
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int fd_count;
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SOCKET s;
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if (win32op->resize_out_sets) {
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size_t size = FD_SET_ALLOC_SIZE(win32op->num_fds_in_fd_sets);
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if (!(win32op->readset_out = mm_realloc(win32op->readset_out, size)))
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return (-1);
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if (!(win32op->exset_out = mm_realloc(win32op->exset_out, size)))
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return (-1);
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if (!(win32op->writeset_out = mm_realloc(win32op->writeset_out, size)))
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return (-1);
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win32op->resize_out_sets = 0;
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}
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fd_set_copy(win32op->readset_out, win32op->readset_in);
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fd_set_copy(win32op->exset_out, win32op->writeset_in);
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fd_set_copy(win32op->writeset_out, win32op->writeset_in);
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fd_count =
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(win32op->readset_out->fd_count > win32op->writeset_out->fd_count) ?
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win32op->readset_out->fd_count : win32op->writeset_out->fd_count;
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if (!fd_count) {
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long msec = tv ? evutil_tv_to_msec(tv) : LONG_MAX;
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/* Sleep's DWORD argument is unsigned long */
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if (msec < 0)
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msec = LONG_MAX;
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/* Windows doesn't like you to call select() with no sockets */
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Sleep(msec);
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return (0);
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}
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EVBASE_RELEASE_LOCK(base, th_base_lock);
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res = select(fd_count,
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(struct fd_set*)win32op->readset_out,
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(struct fd_set*)win32op->writeset_out,
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(struct fd_set*)win32op->exset_out, tv);
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EVBASE_ACQUIRE_LOCK(base, th_base_lock);
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event_debug(("%s: select returned %d", __func__, res));
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if (res <= 0) {
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return res;
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}
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if (win32op->readset_out->fd_count) {
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i = rand() % win32op->readset_out->fd_count;
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for (j=0; j<win32op->readset_out->fd_count; ++j) {
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if (++i >= win32op->readset_out->fd_count)
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i = 0;
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s = win32op->readset_out->fd_array[i];
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evmap_io_active(base, s, EV_READ);
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}
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}
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if (win32op->exset_out->fd_count) {
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i = rand() % win32op->exset_out->fd_count;
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for (j=0; j<win32op->exset_out->fd_count; ++j) {
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if (++i >= win32op->exset_out->fd_count)
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i = 0;
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s = win32op->exset_out->fd_array[i];
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evmap_io_active(base, s, EV_WRITE);
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}
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}
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if (win32op->writeset_out->fd_count) {
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SOCKET s;
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i = rand() % win32op->writeset_out->fd_count;
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for (j=0; j<win32op->writeset_out->fd_count; ++j) {
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|
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);
|
||
|
|
}
|