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/*
* Copyright (c) 2009-2012 Niels Provos, Nick Mathewson
*
* 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 "evconfig-private.h"
#ifndef _WIN32_WINNT
/* Minimum required for InitializeCriticalSectionAndSpinCount */
#define _WIN32_WINNT 0x0403
#endif
#include <winsock2.h>
#include <windows.h>
#include <process.h>
#include <stdio.h>
#include <mswsock.h>
#include "event2/util.h"
#include "util-internal.h"
#include "iocp-internal.h"
#include "log-internal.h"
#include "mm-internal.h"
#include "event-internal.h"
#include "evthread-internal.h"
#define NOTIFICATION_KEY ((ULONG_PTR)-1)
void
event_overlapped_init_(struct event_overlapped *o, iocp_callback cb)
{
memset(o, 0, sizeof(struct event_overlapped));
o->cb = cb;
}
static void
handle_entry(OVERLAPPED *o, ULONG_PTR completion_key, DWORD nBytes, int ok)
{
struct event_overlapped *eo =
EVUTIL_UPCAST(o, struct event_overlapped, overlapped);
eo->cb(eo, completion_key, nBytes, ok);
}
static void
loop(void *port_)
{
struct event_iocp_port *port = port_;
long ms = port->ms;
HANDLE p = port->port;
if (ms <= 0)
ms = INFINITE;
while (1) {
OVERLAPPED *overlapped=NULL;
ULONG_PTR key=0;
DWORD bytes=0;
int ok = GetQueuedCompletionStatus(p, &bytes, &key,
&overlapped, ms);
EnterCriticalSection(&port->lock);
if (port->shutdown) {
if (--port->n_live_threads == 0)
ReleaseSemaphore(port->shutdownSemaphore, 1,
NULL);
LeaveCriticalSection(&port->lock);
return;
}
LeaveCriticalSection(&port->lock);
if (key != NOTIFICATION_KEY && overlapped)
handle_entry(overlapped, key, bytes, ok);
else if (!overlapped)
break;
}
event_warnx("GetQueuedCompletionStatus exited with no event.");
EnterCriticalSection(&port->lock);
if (--port->n_live_threads == 0)
ReleaseSemaphore(port->shutdownSemaphore, 1, NULL);
LeaveCriticalSection(&port->lock);
}
int
event_iocp_port_associate_(struct event_iocp_port *port, evutil_socket_t fd,
ev_uintptr_t key)
{
HANDLE h;
h = CreateIoCompletionPort((HANDLE)fd, port->port, key, port->n_threads);
if (!h)
return -1;
return 0;
}
static void *
get_extension_function(SOCKET s, const GUID *which_fn)
{
void *ptr = NULL;
DWORD bytes=0;
WSAIoctl(s, SIO_GET_EXTENSION_FUNCTION_POINTER,
(GUID*)which_fn, sizeof(*which_fn),
&ptr, sizeof(ptr),
&bytes, NULL, NULL);
/* No need to detect errors here: if ptr is set, then we have a good
function pointer. Otherwise, we should behave as if we had no
function pointer.
*/
return ptr;
}
/* Mingw doesn't have these in its mswsock.h. The values are copied from
wine.h. Perhaps if we copy them exactly, the cargo will come again.
*/
#ifndef WSAID_ACCEPTEX
#define WSAID_ACCEPTEX \
{0xb5367df1,0xcbac,0x11cf,{0x95,0xca,0x00,0x80,0x5f,0x48,0xa1,0x92}}
#endif
#ifndef WSAID_CONNECTEX
#define WSAID_CONNECTEX \
{0x25a207b9,0xddf3,0x4660,{0x8e,0xe9,0x76,0xe5,0x8c,0x74,0x06,0x3e}}
#endif
#ifndef WSAID_GETACCEPTEXSOCKADDRS
#define WSAID_GETACCEPTEXSOCKADDRS \
{0xb5367df2,0xcbac,0x11cf,{0x95,0xca,0x00,0x80,0x5f,0x48,0xa1,0x92}}
#endif
static void
init_extension_functions(struct win32_extension_fns *ext)
{
const GUID acceptex = WSAID_ACCEPTEX;
const GUID connectex = WSAID_CONNECTEX;
const GUID getacceptexsockaddrs = WSAID_GETACCEPTEXSOCKADDRS;
SOCKET s = socket(AF_INET, SOCK_STREAM, 0);
if (s == INVALID_SOCKET)
return;
ext->AcceptEx = get_extension_function(s, &acceptex);
ext->ConnectEx = get_extension_function(s, &connectex);
ext->GetAcceptExSockaddrs = get_extension_function(s,
&getacceptexsockaddrs);
closesocket(s);
}
static struct win32_extension_fns the_extension_fns;
static int extension_fns_initialized = 0;
const struct win32_extension_fns *
event_get_win32_extension_fns_(void)
{
return &the_extension_fns;
}
#define N_CPUS_DEFAULT 2
struct event_iocp_port *
event_iocp_port_launch_(int n_cpus)
{
struct event_iocp_port *port;
int i;
if (!extension_fns_initialized)
init_extension_functions(&the_extension_fns);
if (!(port = mm_calloc(1, sizeof(struct event_iocp_port))))
return NULL;
if (n_cpus <= 0)
n_cpus = N_CPUS_DEFAULT;
port->n_threads = n_cpus * 2;
port->threads = mm_calloc(port->n_threads, sizeof(HANDLE));
if (!port->threads)
goto err;
port->port = CreateIoCompletionPort(INVALID_HANDLE_VALUE, NULL, 0,
n_cpus);
port->ms = -1;
if (!port->port)
goto err;
port->shutdownSemaphore = CreateSemaphore(NULL, 0, 1, NULL);
if (!port->shutdownSemaphore)
goto err;
for (i=0; i<port->n_threads; ++i) {
ev_uintptr_t th = _beginthread(loop, 0, port);
if (th == (ev_uintptr_t)-1)
goto err;
port->threads[i] = (HANDLE)th;
++port->n_live_threads;
}
InitializeCriticalSectionAndSpinCount(&port->lock, 1000);
return port;
err:
if (port->port)
CloseHandle(port->port);
if (port->threads)
mm_free(port->threads);
if (port->shutdownSemaphore)
CloseHandle(port->shutdownSemaphore);
mm_free(port);
return NULL;
}
static void
event_iocp_port_unlock_and_free_(struct event_iocp_port *port)
{
DeleteCriticalSection(&port->lock);
CloseHandle(port->port);
CloseHandle(port->shutdownSemaphore);
mm_free(port->threads);
mm_free(port);
}
static int
event_iocp_notify_all(struct event_iocp_port *port)
{
int i, r, ok=1;
for (i=0; i<port->n_threads; ++i) {
r = PostQueuedCompletionStatus(port->port, 0, NOTIFICATION_KEY,
NULL);
if (!r)
ok = 0;
}
return ok ? 0 : -1;
}
int
event_iocp_shutdown_(struct event_iocp_port *port, long waitMsec)
{
DWORD ms = INFINITE;
int n;
EnterCriticalSection(&port->lock);
port->shutdown = 1;
LeaveCriticalSection(&port->lock);
event_iocp_notify_all(port);
if (waitMsec >= 0)
ms = waitMsec;
WaitForSingleObject(port->shutdownSemaphore, ms);
EnterCriticalSection(&port->lock);
n = port->n_live_threads;
LeaveCriticalSection(&port->lock);
if (n == 0) {
event_iocp_port_unlock_and_free_(port);
return 0;
} else {
return -1;
}
}
int
event_iocp_activate_overlapped_(
struct event_iocp_port *port, struct event_overlapped *o,
ev_uintptr_t key, ev_uint32_t n)
{
BOOL r;
r = PostQueuedCompletionStatus(port->port, n, key, &o->overlapped);
return (r==0) ? -1 : 0;
}
struct event_iocp_port *
event_base_get_iocp_(struct event_base *base)
{
#ifdef _WIN32
return base->iocp;
#else
return NULL;
#endif
}
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