A poller which uses epoll(), supported on Linux 2.5.44 and newer.
(timeout=0.0, map=None)
| 305 | poll2 = poll3 = poll_poller |
| 306 | |
| 307 | def epoll_poller(timeout=0.0, map=None): |
| 308 | """A poller which uses epoll(), supported on Linux 2.5.44 and newer.""" |
| 309 | if map is None: |
| 310 | map = socket_map |
| 311 | try: |
| 312 | epoll_poller.pollster |
| 313 | except AttributeError: |
| 314 | epoll_poller.pollster = select.epoll() |
| 315 | if map: |
| 316 | for fd, obj in map.items(): |
| 317 | flags = newflags = 0 |
| 318 | if obj.readable(): |
| 319 | flags |= select.POLLIN | select.POLLPRI |
| 320 | newflags |= OP_READ |
| 321 | else: |
| 322 | newflags &= ~ OP_READ |
| 323 | # accepting sockets should not be writable |
| 324 | if obj.writable() and not obj.accepting: |
| 325 | flags |= select.POLLOUT |
| 326 | newflags |= OP_WRITE |
| 327 | else: |
| 328 | newflags &= ~ OP_WRITE |
| 329 | if newflags != obj.poller_flags: |
| 330 | obj.poller_flags = newflags |
| 331 | # Only check for exceptions if object was either readable |
| 332 | # or writable. |
| 333 | flags |= select.POLLERR | select.POLLHUP | select.POLLNVAL |
| 334 | try: |
| 335 | if obj.poller_registered: |
| 336 | epoll_poller.pollster.modify(fd, flags) |
| 337 | else: |
| 338 | epoll_poller.pollster.register(fd, flags) |
| 339 | obj.poller_registered = True |
| 340 | except IOError: |
| 341 | pass |
| 342 | try: |
| 343 | r = epoll_poller.pollster.poll(timeout) |
| 344 | except IOError as e: |
| 345 | if e.errno != EINTR: |
| 346 | raise |
| 347 | r = [] |
| 348 | except select.error, err: |
| 349 | if err.args[0] != EINTR: |
| 350 | raise |
| 351 | r = [] |
| 352 | for fd, flags in random.sample(r, len(r)): |
| 353 | obj = map.get(fd) |
| 354 | if obj is None: |
| 355 | continue |
| 356 | readwrite(obj, flags) |
| 357 | else: |
| 358 | current_thread().stop.wait(timeout) |
| 359 | |
| 360 | def kqueue_poller(timeout=0.0, map=None): |
| 361 | """A poller which uses kqueue(), BSD specific.""" |