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-rw-r--r--libevent/event_iocp.c294
1 files changed, 294 insertions, 0 deletions
diff --git a/libevent/event_iocp.c b/libevent/event_iocp.c
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+++ b/libevent/event_iocp.c
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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 int extension_fns_initialized = 0;
+
+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 == EVUTIL_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);
+
+ extension_fns_initialized = 1;
+}
+
+static struct win32_extension_fns the_extension_fns;
+
+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
+}