1 /* 2 * Copyright (c) 2009-2012 Niels Provos, Nick Mathewson 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 3. The name of the author may not be used to endorse or promote products 13 * derived from this software without specific prior written permission. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #ifndef _WIN32_WINNT 28 /* Minimum required for InitializeCriticalSectionAndSpinCount */ 29 #define _WIN32_WINNT 0x0403 30 #endif 31 #include <winsock2.h> 32 #include <windows.h> 33 #include <process.h> 34 #include <stdio.h> 35 #include <mswsock.h> 36 37 #include "event2/util.h" 38 #include "util-internal.h" 39 #include "iocp-internal.h" 40 #include "log-internal.h" 41 #include "mm-internal.h" 42 #include "event-internal.h" 43 #include "evthread-internal.h" 44 45 #define NOTIFICATION_KEY ((ULONG_PTR)-1) 46 47 void 48 event_overlapped_init(struct event_overlapped *o, iocp_callback cb) 49 { 50 memset(o, 0, sizeof(struct event_overlapped)); 51 o->cb = cb; 52 } 53 54 static void 55 handle_entry(OVERLAPPED *o, ULONG_PTR completion_key, DWORD nBytes, int ok) 56 { 57 struct event_overlapped *eo = 58 EVUTIL_UPCAST(o, struct event_overlapped, overlapped); 59 eo->cb(eo, completion_key, nBytes, ok); 60 } 61 62 static void 63 loop(void *_port) 64 { 65 struct event_iocp_port *port = _port; 66 long ms = port->ms; 67 HANDLE p = port->port; 68 69 if (ms <= 0) 70 ms = INFINITE; 71 72 while (1) { 73 OVERLAPPED *overlapped=NULL; 74 ULONG_PTR key=0; 75 DWORD bytes=0; 76 int ok = GetQueuedCompletionStatus(p, &bytes, &key, 77 &overlapped, ms); 78 EnterCriticalSection(&port->lock); 79 if (port->shutdown) { 80 if (--port->n_live_threads == 0) 81 ReleaseSemaphore(port->shutdownSemaphore, 1, 82 NULL); 83 LeaveCriticalSection(&port->lock); 84 return; 85 } 86 LeaveCriticalSection(&port->lock); 87 88 if (key != NOTIFICATION_KEY && overlapped) 89 handle_entry(overlapped, key, bytes, ok); 90 else if (!overlapped) 91 break; 92 } 93 event_warnx("GetQueuedCompletionStatus exited with no event."); 94 EnterCriticalSection(&port->lock); 95 if (--port->n_live_threads == 0) 96 ReleaseSemaphore(port->shutdownSemaphore, 1, NULL); 97 LeaveCriticalSection(&port->lock); 98 } 99 100 int 101 event_iocp_port_associate(struct event_iocp_port *port, evutil_socket_t fd, 102 ev_uintptr_t key) 103 { 104 HANDLE h; 105 h = CreateIoCompletionPort((HANDLE)fd, port->port, key, port->n_threads); 106 if (!h) 107 return -1; 108 return 0; 109 } 110 111 static void * 112 get_extension_function(SOCKET s, const GUID *which_fn) 113 { 114 void *ptr = NULL; 115 DWORD bytes=0; 116 WSAIoctl(s, SIO_GET_EXTENSION_FUNCTION_POINTER, 117 (GUID*)which_fn, sizeof(*which_fn), 118 &ptr, sizeof(ptr), 119 &bytes, NULL, NULL); 120 121 /* No need to detect errors here: if ptr is set, then we have a good 122 function pointer. Otherwise, we should behave as if we had no 123 function pointer. 124 */ 125 return ptr; 126 } 127 128 /* Mingw doesn't have these in its mswsock.h. The values are copied from 129 wine.h. Perhaps if we copy them exactly, the cargo will come again. 130 */ 131 #ifndef WSAID_ACCEPTEX 132 #define WSAID_ACCEPTEX \ 133 {0xb5367df1,0xcbac,0x11cf,{0x95,0xca,0x00,0x80,0x5f,0x48,0xa1,0x92}} 134 #endif 135 #ifndef WSAID_CONNECTEX 136 #define WSAID_CONNECTEX \ 137 {0x25a207b9,0xddf3,0x4660,{0x8e,0xe9,0x76,0xe5,0x8c,0x74,0x06,0x3e}} 138 #endif 139 #ifndef WSAID_GETACCEPTEXSOCKADDRS 140 #define WSAID_GETACCEPTEXSOCKADDRS \ 141 {0xb5367df2,0xcbac,0x11cf,{0x95,0xca,0x00,0x80,0x5f,0x48,0xa1,0x92}} 142 #endif 143 144 static int extension_fns_initialized = 0; 145 146 static void 147 init_extension_functions(struct win32_extension_fns *ext) 148 { 149 const GUID acceptex = WSAID_ACCEPTEX; 150 const GUID connectex = WSAID_CONNECTEX; 151 const GUID getacceptexsockaddrs = WSAID_GETACCEPTEXSOCKADDRS; 152 SOCKET s = socket(AF_INET, SOCK_STREAM, 0); 153 if (s == INVALID_SOCKET) 154 return; 155 ext->AcceptEx = get_extension_function(s, &acceptex); 156 ext->ConnectEx = get_extension_function(s, &connectex); 157 ext->GetAcceptExSockaddrs = get_extension_function(s, 158 &getacceptexsockaddrs); 159 closesocket(s); 160 161 extension_fns_initialized = 1; 162 } 163 164 static struct win32_extension_fns the_extension_fns; 165 166 const struct win32_extension_fns * 167 event_get_win32_extension_fns(void) 168 { 169 return &the_extension_fns; 170 } 171 172 #define N_CPUS_DEFAULT 2 173 174 struct event_iocp_port * 175 event_iocp_port_launch(int n_cpus) 176 { 177 struct event_iocp_port *port; 178 int i; 179 180 if (!extension_fns_initialized) 181 init_extension_functions(&the_extension_fns); 182 183 if (!(port = mm_calloc(1, sizeof(struct event_iocp_port)))) 184 return NULL; 185 186 if (n_cpus <= 0) 187 n_cpus = N_CPUS_DEFAULT; 188 port->n_threads = n_cpus * 2; 189 port->threads = mm_calloc(port->n_threads, sizeof(HANDLE)); 190 if (!port->threads) 191 goto err; 192 193 port->port = CreateIoCompletionPort(INVALID_HANDLE_VALUE, NULL, 0, 194 n_cpus); 195 port->ms = -1; 196 if (!port->port) 197 goto err; 198 199 port->shutdownSemaphore = CreateSemaphore(NULL, 0, 1, NULL); 200 if (!port->shutdownSemaphore) 201 goto err; 202 203 for (i=0; i<port->n_threads; ++i) { 204 ev_uintptr_t th = _beginthread(loop, 0, port); 205 if (th == (ev_uintptr_t)-1) 206 goto err; 207 port->threads[i] = (HANDLE)th; 208 ++port->n_live_threads; 209 } 210 211 InitializeCriticalSectionAndSpinCount(&port->lock, 1000); 212 213 return port; 214 err: 215 if (port->port) 216 CloseHandle(port->port); 217 if (port->threads) 218 mm_free(port->threads); 219 if (port->shutdownSemaphore) 220 CloseHandle(port->shutdownSemaphore); 221 mm_free(port); 222 return NULL; 223 } 224 225 static void 226 _event_iocp_port_unlock_and_free(struct event_iocp_port *port) 227 { 228 DeleteCriticalSection(&port->lock); 229 CloseHandle(port->port); 230 CloseHandle(port->shutdownSemaphore); 231 mm_free(port->threads); 232 mm_free(port); 233 } 234 235 static int 236 event_iocp_notify_all(struct event_iocp_port *port) 237 { 238 int i, r, ok=1; 239 for (i=0; i<port->n_threads; ++i) { 240 r = PostQueuedCompletionStatus(port->port, 0, NOTIFICATION_KEY, 241 NULL); 242 if (!r) 243 ok = 0; 244 } 245 return ok ? 0 : -1; 246 } 247 248 int 249 event_iocp_shutdown(struct event_iocp_port *port, long waitMsec) 250 { 251 DWORD ms = INFINITE; 252 int n; 253 254 EnterCriticalSection(&port->lock); 255 port->shutdown = 1; 256 LeaveCriticalSection(&port->lock); 257 event_iocp_notify_all(port); 258 259 if (waitMsec >= 0) 260 ms = waitMsec; 261 262 WaitForSingleObject(port->shutdownSemaphore, ms); 263 EnterCriticalSection(&port->lock); 264 n = port->n_live_threads; 265 LeaveCriticalSection(&port->lock); 266 if (n == 0) { 267 _event_iocp_port_unlock_and_free(port); 268 return 0; 269 } else { 270 return -1; 271 } 272 } 273 274 int 275 event_iocp_activate_overlapped( 276 struct event_iocp_port *port, struct event_overlapped *o, 277 ev_uintptr_t key, ev_uint32_t n) 278 { 279 BOOL r; 280 281 r = PostQueuedCompletionStatus(port->port, n, key, &o->overlapped); 282 return (r==0) ? -1 : 0; 283 } 284 285 struct event_iocp_port * 286 event_base_get_iocp(struct event_base *base) 287 { 288 #ifdef WIN32 289 return base->iocp; 290 #else 291 return NULL; 292 #endif 293 } 294
