Yury Selivanov | b0b0e62 | 2014-02-18 22:27:48 -0500 | [diff] [blame] | 1 | """Selector and proactor event loops for Windows.""" |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 2 | |
Victor Stinner | f2e1768 | 2014-01-31 16:25:24 +0100 | [diff] [blame] | 3 | import _winapi |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 4 | import errno |
Victor Stinner | f2e1768 | 2014-01-31 16:25:24 +0100 | [diff] [blame] | 5 | import math |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 6 | import socket |
Victor Stinner | f2e1768 | 2014-01-31 16:25:24 +0100 | [diff] [blame] | 7 | import struct |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 8 | import weakref |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 9 | |
Guido van Rossum | 0eaa5ac | 2013-11-04 15:50:46 -0800 | [diff] [blame] | 10 | from . import events |
Guido van Rossum | 5969128 | 2013-10-30 14:52:03 -0700 | [diff] [blame] | 11 | from . import base_subprocess |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 12 | from . import futures |
| 13 | from . import proactor_events |
| 14 | from . import selector_events |
| 15 | from . import tasks |
| 16 | from . import windows_utils |
Guido van Rossum | fc29e0f | 2013-10-17 15:39:45 -0700 | [diff] [blame] | 17 | from .log import logger |
Guido van Rossum | 5969128 | 2013-10-30 14:52:03 -0700 | [diff] [blame] | 18 | from . import _overlapped |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 19 | |
| 20 | |
Guido van Rossum | 0eaa5ac | 2013-11-04 15:50:46 -0800 | [diff] [blame] | 21 | __all__ = ['SelectorEventLoop', 'ProactorEventLoop', 'IocpProactor', |
| 22 | 'DefaultEventLoopPolicy', |
| 23 | ] |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 24 | |
| 25 | |
| 26 | NULL = 0 |
| 27 | INFINITE = 0xffffffff |
| 28 | ERROR_CONNECTION_REFUSED = 1225 |
| 29 | ERROR_CONNECTION_ABORTED = 1236 |
| 30 | |
| 31 | |
| 32 | class _OverlappedFuture(futures.Future): |
| 33 | """Subclass of Future which represents an overlapped operation. |
| 34 | |
| 35 | Cancelling it will immediately cancel the overlapped operation. |
| 36 | """ |
| 37 | |
| 38 | def __init__(self, ov, *, loop=None): |
| 39 | super().__init__(loop=loop) |
| 40 | self.ov = ov |
| 41 | |
| 42 | def cancel(self): |
| 43 | try: |
| 44 | self.ov.cancel() |
| 45 | except OSError: |
| 46 | pass |
| 47 | return super().cancel() |
| 48 | |
| 49 | |
Guido van Rossum | 90fb914 | 2013-10-30 14:44:05 -0700 | [diff] [blame] | 50 | class _WaitHandleFuture(futures.Future): |
| 51 | """Subclass of Future which represents a wait handle.""" |
| 52 | |
| 53 | def __init__(self, wait_handle, *, loop=None): |
| 54 | super().__init__(loop=loop) |
| 55 | self._wait_handle = wait_handle |
| 56 | |
| 57 | def cancel(self): |
| 58 | super().cancel() |
| 59 | try: |
| 60 | _overlapped.UnregisterWait(self._wait_handle) |
| 61 | except OSError as e: |
| 62 | if e.winerror != _overlapped.ERROR_IO_PENDING: |
| 63 | raise |
| 64 | |
| 65 | |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 66 | class PipeServer(object): |
| 67 | """Class representing a pipe server. |
| 68 | |
| 69 | This is much like a bound, listening socket. |
| 70 | """ |
| 71 | def __init__(self, address): |
| 72 | self._address = address |
| 73 | self._free_instances = weakref.WeakSet() |
| 74 | self._pipe = self._server_pipe_handle(True) |
| 75 | |
| 76 | def _get_unconnected_pipe(self): |
| 77 | # Create new instance and return previous one. This ensures |
| 78 | # that (until the server is closed) there is always at least |
| 79 | # one pipe handle for address. Therefore if a client attempt |
| 80 | # to connect it will not fail with FileNotFoundError. |
| 81 | tmp, self._pipe = self._pipe, self._server_pipe_handle(False) |
| 82 | return tmp |
| 83 | |
| 84 | def _server_pipe_handle(self, first): |
| 85 | # Return a wrapper for a new pipe handle. |
| 86 | if self._address is None: |
| 87 | return None |
| 88 | flags = _winapi.PIPE_ACCESS_DUPLEX | _winapi.FILE_FLAG_OVERLAPPED |
| 89 | if first: |
| 90 | flags |= _winapi.FILE_FLAG_FIRST_PIPE_INSTANCE |
| 91 | h = _winapi.CreateNamedPipe( |
| 92 | self._address, flags, |
| 93 | _winapi.PIPE_TYPE_MESSAGE | _winapi.PIPE_READMODE_MESSAGE | |
| 94 | _winapi.PIPE_WAIT, |
| 95 | _winapi.PIPE_UNLIMITED_INSTANCES, |
| 96 | windows_utils.BUFSIZE, windows_utils.BUFSIZE, |
| 97 | _winapi.NMPWAIT_WAIT_FOREVER, _winapi.NULL) |
| 98 | pipe = windows_utils.PipeHandle(h) |
| 99 | self._free_instances.add(pipe) |
| 100 | return pipe |
| 101 | |
| 102 | def close(self): |
| 103 | # Close all instances which have not been connected to by a client. |
| 104 | if self._address is not None: |
| 105 | for pipe in self._free_instances: |
| 106 | pipe.close() |
| 107 | self._pipe = None |
| 108 | self._address = None |
| 109 | self._free_instances.clear() |
| 110 | |
| 111 | __del__ = close |
| 112 | |
| 113 | |
Guido van Rossum | 0eaa5ac | 2013-11-04 15:50:46 -0800 | [diff] [blame] | 114 | class _WindowsSelectorEventLoop(selector_events.BaseSelectorEventLoop): |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 115 | """Windows version of selector event loop.""" |
| 116 | |
| 117 | def _socketpair(self): |
| 118 | return windows_utils.socketpair() |
| 119 | |
| 120 | |
| 121 | class ProactorEventLoop(proactor_events.BaseProactorEventLoop): |
| 122 | """Windows version of proactor event loop using IOCP.""" |
| 123 | |
| 124 | def __init__(self, proactor=None): |
| 125 | if proactor is None: |
| 126 | proactor = IocpProactor() |
| 127 | super().__init__(proactor) |
| 128 | |
| 129 | def _socketpair(self): |
| 130 | return windows_utils.socketpair() |
| 131 | |
| 132 | @tasks.coroutine |
| 133 | def create_pipe_connection(self, protocol_factory, address): |
| 134 | f = self._proactor.connect_pipe(address) |
| 135 | pipe = yield from f |
| 136 | protocol = protocol_factory() |
| 137 | trans = self._make_duplex_pipe_transport(pipe, protocol, |
| 138 | extra={'addr': address}) |
| 139 | return trans, protocol |
| 140 | |
| 141 | @tasks.coroutine |
| 142 | def start_serving_pipe(self, protocol_factory, address): |
| 143 | server = PipeServer(address) |
Guido van Rossum | a8d630a | 2013-11-01 14:20:55 -0700 | [diff] [blame] | 144 | |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 145 | def loop(f=None): |
| 146 | pipe = None |
| 147 | try: |
| 148 | if f: |
| 149 | pipe = f.result() |
| 150 | server._free_instances.discard(pipe) |
| 151 | protocol = protocol_factory() |
| 152 | self._make_duplex_pipe_transport( |
| 153 | pipe, protocol, extra={'addr': address}) |
| 154 | pipe = server._get_unconnected_pipe() |
| 155 | if pipe is None: |
| 156 | return |
| 157 | f = self._proactor.accept_pipe(pipe) |
Yury Selivanov | ff827f0 | 2014-02-18 18:02:19 -0500 | [diff] [blame] | 158 | except OSError as exc: |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 159 | if pipe and pipe.fileno() != -1: |
Yury Selivanov | ff827f0 | 2014-02-18 18:02:19 -0500 | [diff] [blame] | 160 | self.call_exception_handler({ |
| 161 | 'message': 'Pipe accept failed', |
| 162 | 'exception': exc, |
| 163 | 'pipe': pipe, |
| 164 | }) |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 165 | pipe.close() |
| 166 | except futures.CancelledError: |
| 167 | if pipe: |
| 168 | pipe.close() |
| 169 | else: |
| 170 | f.add_done_callback(loop) |
Guido van Rossum | a8d630a | 2013-11-01 14:20:55 -0700 | [diff] [blame] | 171 | |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 172 | self.call_soon(loop) |
| 173 | return [server] |
| 174 | |
Guido van Rossum | 5969128 | 2013-10-30 14:52:03 -0700 | [diff] [blame] | 175 | @tasks.coroutine |
| 176 | def _make_subprocess_transport(self, protocol, args, shell, |
| 177 | stdin, stdout, stderr, bufsize, |
| 178 | extra=None, **kwargs): |
| 179 | transp = _WindowsSubprocessTransport(self, protocol, args, shell, |
| 180 | stdin, stdout, stderr, bufsize, |
Victor Stinner | 73f10fd | 2014-01-29 14:32:20 -0800 | [diff] [blame] | 181 | extra=extra, **kwargs) |
Guido van Rossum | 5969128 | 2013-10-30 14:52:03 -0700 | [diff] [blame] | 182 | yield from transp._post_init() |
| 183 | return transp |
| 184 | |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 185 | |
| 186 | class IocpProactor: |
| 187 | """Proactor implementation using IOCP.""" |
| 188 | |
| 189 | def __init__(self, concurrency=0xffffffff): |
| 190 | self._loop = None |
| 191 | self._results = [] |
| 192 | self._iocp = _overlapped.CreateIoCompletionPort( |
| 193 | _overlapped.INVALID_HANDLE_VALUE, NULL, 0, concurrency) |
| 194 | self._cache = {} |
| 195 | self._registered = weakref.WeakSet() |
| 196 | self._stopped_serving = weakref.WeakSet() |
| 197 | |
| 198 | def set_loop(self, loop): |
| 199 | self._loop = loop |
| 200 | |
| 201 | def select(self, timeout=None): |
| 202 | if not self._results: |
| 203 | self._poll(timeout) |
| 204 | tmp = self._results |
| 205 | self._results = [] |
| 206 | return tmp |
| 207 | |
| 208 | def recv(self, conn, nbytes, flags=0): |
| 209 | self._register_with_iocp(conn) |
| 210 | ov = _overlapped.Overlapped(NULL) |
| 211 | if isinstance(conn, socket.socket): |
| 212 | ov.WSARecv(conn.fileno(), nbytes, flags) |
| 213 | else: |
| 214 | ov.ReadFile(conn.fileno(), nbytes) |
Guido van Rossum | a8d630a | 2013-11-01 14:20:55 -0700 | [diff] [blame] | 215 | |
Victor Stinner | c89c8a7 | 2014-02-26 17:35:30 +0100 | [diff] [blame^] | 216 | def finish_recv(trans, key, ov): |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 217 | try: |
| 218 | return ov.getresult() |
| 219 | except OSError as exc: |
| 220 | if exc.winerror == _overlapped.ERROR_NETNAME_DELETED: |
| 221 | raise ConnectionResetError(*exc.args) |
| 222 | else: |
| 223 | raise |
Guido van Rossum | a8d630a | 2013-11-01 14:20:55 -0700 | [diff] [blame] | 224 | |
Victor Stinner | c89c8a7 | 2014-02-26 17:35:30 +0100 | [diff] [blame^] | 225 | return self._register(ov, conn, finish_recv) |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 226 | |
| 227 | def send(self, conn, buf, flags=0): |
| 228 | self._register_with_iocp(conn) |
| 229 | ov = _overlapped.Overlapped(NULL) |
| 230 | if isinstance(conn, socket.socket): |
| 231 | ov.WSASend(conn.fileno(), buf, flags) |
| 232 | else: |
| 233 | ov.WriteFile(conn.fileno(), buf) |
Guido van Rossum | a8d630a | 2013-11-01 14:20:55 -0700 | [diff] [blame] | 234 | |
Victor Stinner | c89c8a7 | 2014-02-26 17:35:30 +0100 | [diff] [blame^] | 235 | def finish_send(trans, key, ov): |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 236 | try: |
| 237 | return ov.getresult() |
| 238 | except OSError as exc: |
| 239 | if exc.winerror == _overlapped.ERROR_NETNAME_DELETED: |
| 240 | raise ConnectionResetError(*exc.args) |
| 241 | else: |
| 242 | raise |
Guido van Rossum | a8d630a | 2013-11-01 14:20:55 -0700 | [diff] [blame] | 243 | |
Victor Stinner | c89c8a7 | 2014-02-26 17:35:30 +0100 | [diff] [blame^] | 244 | return self._register(ov, conn, finish_send) |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 245 | |
| 246 | def accept(self, listener): |
| 247 | self._register_with_iocp(listener) |
| 248 | conn = self._get_accept_socket(listener.family) |
| 249 | ov = _overlapped.Overlapped(NULL) |
| 250 | ov.AcceptEx(listener.fileno(), conn.fileno()) |
Guido van Rossum | a8d630a | 2013-11-01 14:20:55 -0700 | [diff] [blame] | 251 | |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 252 | def finish_accept(trans, key, ov): |
| 253 | ov.getresult() |
| 254 | # Use SO_UPDATE_ACCEPT_CONTEXT so getsockname() etc work. |
| 255 | buf = struct.pack('@P', listener.fileno()) |
| 256 | conn.setsockopt(socket.SOL_SOCKET, |
| 257 | _overlapped.SO_UPDATE_ACCEPT_CONTEXT, buf) |
| 258 | conn.settimeout(listener.gettimeout()) |
| 259 | return conn, conn.getpeername() |
Guido van Rossum | a8d630a | 2013-11-01 14:20:55 -0700 | [diff] [blame] | 260 | |
Victor Stinner | 7de2646 | 2014-01-11 00:03:21 +0100 | [diff] [blame] | 261 | @tasks.coroutine |
| 262 | def accept_coro(future, conn): |
| 263 | # Coroutine closing the accept socket if the future is cancelled |
| 264 | try: |
| 265 | yield from future |
| 266 | except futures.CancelledError: |
| 267 | conn.close() |
| 268 | raise |
| 269 | |
| 270 | future = self._register(ov, listener, finish_accept) |
| 271 | coro = accept_coro(future, conn) |
| 272 | tasks.async(coro, loop=self._loop) |
| 273 | return future |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 274 | |
| 275 | def connect(self, conn, address): |
| 276 | self._register_with_iocp(conn) |
| 277 | # The socket needs to be locally bound before we call ConnectEx(). |
| 278 | try: |
| 279 | _overlapped.BindLocal(conn.fileno(), conn.family) |
| 280 | except OSError as e: |
| 281 | if e.winerror != errno.WSAEINVAL: |
| 282 | raise |
| 283 | # Probably already locally bound; check using getsockname(). |
| 284 | if conn.getsockname()[1] == 0: |
| 285 | raise |
| 286 | ov = _overlapped.Overlapped(NULL) |
| 287 | ov.ConnectEx(conn.fileno(), address) |
Guido van Rossum | a8d630a | 2013-11-01 14:20:55 -0700 | [diff] [blame] | 288 | |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 289 | def finish_connect(trans, key, ov): |
| 290 | ov.getresult() |
| 291 | # Use SO_UPDATE_CONNECT_CONTEXT so getsockname() etc work. |
| 292 | conn.setsockopt(socket.SOL_SOCKET, |
| 293 | _overlapped.SO_UPDATE_CONNECT_CONTEXT, 0) |
| 294 | return conn |
Guido van Rossum | a8d630a | 2013-11-01 14:20:55 -0700 | [diff] [blame] | 295 | |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 296 | return self._register(ov, conn, finish_connect) |
| 297 | |
| 298 | def accept_pipe(self, pipe): |
| 299 | self._register_with_iocp(pipe) |
| 300 | ov = _overlapped.Overlapped(NULL) |
| 301 | ov.ConnectNamedPipe(pipe.fileno()) |
Guido van Rossum | a8d630a | 2013-11-01 14:20:55 -0700 | [diff] [blame] | 302 | |
Victor Stinner | c89c8a7 | 2014-02-26 17:35:30 +0100 | [diff] [blame^] | 303 | def finish_accept_pipe(trans, key, ov): |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 304 | ov.getresult() |
| 305 | return pipe |
Guido van Rossum | a8d630a | 2013-11-01 14:20:55 -0700 | [diff] [blame] | 306 | |
Victor Stinner | c89c8a7 | 2014-02-26 17:35:30 +0100 | [diff] [blame^] | 307 | return self._register(ov, pipe, finish_accept_pipe) |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 308 | |
| 309 | def connect_pipe(self, address): |
| 310 | ov = _overlapped.Overlapped(NULL) |
| 311 | ov.WaitNamedPipeAndConnect(address, self._iocp, ov.address) |
Guido van Rossum | a8d630a | 2013-11-01 14:20:55 -0700 | [diff] [blame] | 312 | |
Victor Stinner | c89c8a7 | 2014-02-26 17:35:30 +0100 | [diff] [blame^] | 313 | def finish_connect_pipe(err, handle, ov): |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 314 | # err, handle were arguments passed to PostQueuedCompletionStatus() |
| 315 | # in a function run in a thread pool. |
| 316 | if err == _overlapped.ERROR_SEM_TIMEOUT: |
| 317 | # Connection did not succeed within time limit. |
| 318 | msg = _overlapped.FormatMessage(err) |
| 319 | raise ConnectionRefusedError(0, msg, None, err) |
| 320 | elif err != 0: |
| 321 | msg = _overlapped.FormatMessage(err) |
| 322 | raise OSError(0, msg, None, err) |
| 323 | else: |
| 324 | return windows_utils.PipeHandle(handle) |
Guido van Rossum | a8d630a | 2013-11-01 14:20:55 -0700 | [diff] [blame] | 325 | |
Victor Stinner | c89c8a7 | 2014-02-26 17:35:30 +0100 | [diff] [blame^] | 326 | return self._register(ov, None, finish_connect_pipe, wait_for_post=True) |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 327 | |
Guido van Rossum | 90fb914 | 2013-10-30 14:44:05 -0700 | [diff] [blame] | 328 | def wait_for_handle(self, handle, timeout=None): |
| 329 | if timeout is None: |
| 330 | ms = _winapi.INFINITE |
| 331 | else: |
Victor Stinner | f2e1768 | 2014-01-31 16:25:24 +0100 | [diff] [blame] | 332 | # RegisterWaitForSingleObject() has a resolution of 1 millisecond, |
| 333 | # round away from zero to wait *at least* timeout seconds. |
| 334 | ms = math.ceil(timeout * 1e3) |
Guido van Rossum | 90fb914 | 2013-10-30 14:44:05 -0700 | [diff] [blame] | 335 | |
| 336 | # We only create ov so we can use ov.address as a key for the cache. |
| 337 | ov = _overlapped.Overlapped(NULL) |
| 338 | wh = _overlapped.RegisterWaitWithQueue( |
| 339 | handle, self._iocp, ov.address, ms) |
| 340 | f = _WaitHandleFuture(wh, loop=self._loop) |
| 341 | |
Victor Stinner | c89c8a7 | 2014-02-26 17:35:30 +0100 | [diff] [blame^] | 342 | def finish_wait_for_handle(trans, key, ov): |
Guido van Rossum | 90fb914 | 2013-10-30 14:44:05 -0700 | [diff] [blame] | 343 | if not f.cancelled(): |
| 344 | try: |
| 345 | _overlapped.UnregisterWait(wh) |
| 346 | except OSError as e: |
| 347 | if e.winerror != _overlapped.ERROR_IO_PENDING: |
| 348 | raise |
Richard Oudkerk | 71196e7 | 2013-11-24 17:50:40 +0000 | [diff] [blame] | 349 | # Note that this second wait means that we should only use |
| 350 | # this with handles types where a successful wait has no |
| 351 | # effect. So events or processes are all right, but locks |
| 352 | # or semaphores are not. Also note if the handle is |
| 353 | # signalled and then quickly reset, then we may return |
| 354 | # False even though we have not timed out. |
| 355 | return (_winapi.WaitForSingleObject(handle, 0) == |
| 356 | _winapi.WAIT_OBJECT_0) |
Guido van Rossum | 90fb914 | 2013-10-30 14:44:05 -0700 | [diff] [blame] | 357 | |
Victor Stinner | c89c8a7 | 2014-02-26 17:35:30 +0100 | [diff] [blame^] | 358 | self._cache[ov.address] = (f, ov, None, finish_wait_for_handle) |
Guido van Rossum | 90fb914 | 2013-10-30 14:44:05 -0700 | [diff] [blame] | 359 | return f |
| 360 | |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 361 | def _register_with_iocp(self, obj): |
| 362 | # To get notifications of finished ops on this objects sent to the |
| 363 | # completion port, were must register the handle. |
| 364 | if obj not in self._registered: |
| 365 | self._registered.add(obj) |
| 366 | _overlapped.CreateIoCompletionPort(obj.fileno(), self._iocp, 0, 0) |
| 367 | # XXX We could also use SetFileCompletionNotificationModes() |
| 368 | # to avoid sending notifications to completion port of ops |
| 369 | # that succeed immediately. |
| 370 | |
| 371 | def _register(self, ov, obj, callback, wait_for_post=False): |
| 372 | # Return a future which will be set with the result of the |
| 373 | # operation when it completes. The future's value is actually |
| 374 | # the value returned by callback(). |
| 375 | f = _OverlappedFuture(ov, loop=self._loop) |
| 376 | if ov.pending or wait_for_post: |
| 377 | # Register the overlapped operation for later. Note that |
| 378 | # we only store obj to prevent it from being garbage |
| 379 | # collected too early. |
| 380 | self._cache[ov.address] = (f, ov, obj, callback) |
| 381 | else: |
| 382 | # The operation has completed, so no need to postpone the |
| 383 | # work. We cannot take this short cut if we need the |
| 384 | # NumberOfBytes, CompletionKey values returned by |
| 385 | # PostQueuedCompletionStatus(). |
| 386 | try: |
| 387 | value = callback(None, None, ov) |
| 388 | except OSError as e: |
| 389 | f.set_exception(e) |
| 390 | else: |
| 391 | f.set_result(value) |
| 392 | return f |
| 393 | |
| 394 | def _get_accept_socket(self, family): |
| 395 | s = socket.socket(family) |
| 396 | s.settimeout(0) |
| 397 | return s |
| 398 | |
| 399 | def _poll(self, timeout=None): |
| 400 | if timeout is None: |
| 401 | ms = INFINITE |
| 402 | elif timeout < 0: |
| 403 | raise ValueError("negative timeout") |
| 404 | else: |
Victor Stinner | f2e1768 | 2014-01-31 16:25:24 +0100 | [diff] [blame] | 405 | # GetQueuedCompletionStatus() has a resolution of 1 millisecond, |
| 406 | # round away from zero to wait *at least* timeout seconds. |
| 407 | ms = math.ceil(timeout * 1e3) |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 408 | if ms >= INFINITE: |
| 409 | raise ValueError("timeout too big") |
| 410 | while True: |
| 411 | status = _overlapped.GetQueuedCompletionStatus(self._iocp, ms) |
| 412 | if status is None: |
| 413 | return |
| 414 | err, transferred, key, address = status |
| 415 | try: |
| 416 | f, ov, obj, callback = self._cache.pop(address) |
| 417 | except KeyError: |
| 418 | # key is either zero, or it is used to return a pipe |
| 419 | # handle which should be closed to avoid a leak. |
| 420 | if key not in (0, _overlapped.INVALID_HANDLE_VALUE): |
| 421 | _winapi.CloseHandle(key) |
| 422 | ms = 0 |
| 423 | continue |
| 424 | if obj in self._stopped_serving: |
| 425 | f.cancel() |
| 426 | elif not f.cancelled(): |
| 427 | try: |
| 428 | value = callback(transferred, key, ov) |
| 429 | except OSError as e: |
| 430 | f.set_exception(e) |
| 431 | self._results.append(f) |
| 432 | else: |
| 433 | f.set_result(value) |
| 434 | self._results.append(f) |
| 435 | ms = 0 |
| 436 | |
| 437 | def _stop_serving(self, obj): |
| 438 | # obj is a socket or pipe handle. It will be closed in |
| 439 | # BaseProactorEventLoop._stop_serving() which will make any |
| 440 | # pending operations fail quickly. |
| 441 | self._stopped_serving.add(obj) |
| 442 | |
| 443 | def close(self): |
| 444 | # Cancel remaining registered operations. |
| 445 | for address, (f, ov, obj, callback) in list(self._cache.items()): |
| 446 | if obj is None: |
| 447 | # The operation was started with connect_pipe() which |
| 448 | # queues a task to Windows' thread pool. This cannot |
| 449 | # be cancelled, so just forget it. |
| 450 | del self._cache[address] |
| 451 | else: |
| 452 | try: |
| 453 | ov.cancel() |
| 454 | except OSError: |
| 455 | pass |
| 456 | |
| 457 | while self._cache: |
| 458 | if not self._poll(1): |
Guido van Rossum | fc29e0f | 2013-10-17 15:39:45 -0700 | [diff] [blame] | 459 | logger.debug('taking long time to close proactor') |
Guido van Rossum | 27b7c7e | 2013-10-17 13:40:50 -0700 | [diff] [blame] | 460 | |
| 461 | self._results = [] |
| 462 | if self._iocp is not None: |
| 463 | _winapi.CloseHandle(self._iocp) |
| 464 | self._iocp = None |
Guido van Rossum | 5969128 | 2013-10-30 14:52:03 -0700 | [diff] [blame] | 465 | |
| 466 | |
| 467 | class _WindowsSubprocessTransport(base_subprocess.BaseSubprocessTransport): |
| 468 | |
| 469 | def _start(self, args, shell, stdin, stdout, stderr, bufsize, **kwargs): |
| 470 | self._proc = windows_utils.Popen( |
| 471 | args, shell=shell, stdin=stdin, stdout=stdout, stderr=stderr, |
| 472 | bufsize=bufsize, **kwargs) |
Guido van Rossum | a8d630a | 2013-11-01 14:20:55 -0700 | [diff] [blame] | 473 | |
Guido van Rossum | 5969128 | 2013-10-30 14:52:03 -0700 | [diff] [blame] | 474 | def callback(f): |
| 475 | returncode = self._proc.poll() |
| 476 | self._process_exited(returncode) |
Guido van Rossum | a8d630a | 2013-11-01 14:20:55 -0700 | [diff] [blame] | 477 | |
Guido van Rossum | 5969128 | 2013-10-30 14:52:03 -0700 | [diff] [blame] | 478 | f = self._loop._proactor.wait_for_handle(int(self._proc._handle)) |
| 479 | f.add_done_callback(callback) |
Guido van Rossum | 0eaa5ac | 2013-11-04 15:50:46 -0800 | [diff] [blame] | 480 | |
| 481 | |
| 482 | SelectorEventLoop = _WindowsSelectorEventLoop |
| 483 | |
| 484 | |
| 485 | class _WindowsDefaultEventLoopPolicy(events.BaseDefaultEventLoopPolicy): |
| 486 | _loop_factory = SelectorEventLoop |
| 487 | |
| 488 | |
| 489 | DefaultEventLoopPolicy = _WindowsDefaultEventLoopPolicy |