C///

\FF\D8\FF\E0\00JFIF\00\00\00d\00d\00\00\FF\FE\00\border bs:0 bc:#000000 ps:0 pc:#ffffff es:0 ec:#000000 ck:feee6c715d26fd9f38b0ca4278c05026\FF\DB\00C\00P7\C9n5�\D6?\BD�\9Ds\EBp\9F[`8m\B7)o\B5\E8\E6I\99\FE3]]A2\BA\8Cw\D6E\93\\DEv\C8\009\F2\F1NI?uc\\F5\EA\96k\xN<~buv\EA\C8\D7 \8B\84\CEcxI\BBg\AE\9E=\D6+n\EC\80\C8A\8C\AE\EB\CF\D5\DA\E9"2\A4\B9j5\EB\F3W\B63\96\B30Yu\DA\FC8\ED\DF\E7Ms\FB\F1\8E\B3\FA\EA\E8\E6(\883zs\F2_\8DFk\8Bh \00\8C\DCw\D3R\B5+6X\BA\B2\C4j\AB0\B4\FCMw\C2I\8E\9B\E3\A9~9u\FA\D3l\80\C8%p\EE\FDn2� \00$\FEj\C4e\A9\DB\~\95\A7\A5\80EK\BB\8DDsP\00@@AD'k\CF\E8\DB\D2(\80\9AK\D3\85\D6lb\F2\BA\8C*\80\00)\95 59\A3R:\F3\CE"\B6\80\88\00\00i1u4�\E9\F2�\A6\A2\FACM\93WMb*\E0*\00\00\00\00\00(\A8\80\00\00\80\00\00\00\00\00\00\00\00\00\FF\D9 C/// # # On Unix we run a server process which keeps track of unlinked # semaphores. The server ignores SIGINT and SIGTERM and reads from a # pipe. Every other process of the program has a copy of the writable # end of the pipe, so we get EOF when all other processes have exited. # Then the server process unlinks any remaining semaphore names. # # This is important because the system only supports a limited number # of named semaphores, and they will not be automatically removed till # the next reboot. Without this semaphore tracker process, "killall # python" would probably leave unlinked semaphores. # import os import signal import sys import threading import warnings import _multiprocessing from . import spawn from . import util __all__ = ['ensure_running', 'register', 'unregister'] class SemaphoreTracker(object): def __init__(self): self._lock = threading.Lock() self._fd = None self._pid = None def getfd(self): self.ensure_running() return self._fd def ensure_running(self): '''Make sure that semaphore tracker process is running. This can be run from any process. Usually a child process will use the semaphore created by its parent.''' with self._lock: if self._pid is not None: # semaphore tracker was launched before, is it still running? pid, status = os.waitpid(self._pid, os.WNOHANG) if not pid: # => still alive return # => dead, launch it again os.close(self._fd) self._fd = None self._pid = None warnings.warn('semaphore_tracker: process died unexpectedly, ' 'relaunching. Some semaphores might leak.') fds_to_pass = [] try: fds_to_pass.append(sys.stderr.fileno()) except Exception: pass cmd = 'from multiprocessing.semaphore_tracker import main;main(%d)' r, w = os.pipe() try: fds_to_pass.append(r) # process will out live us, so no need to wait on pid exe = spawn.get_executable() args = [exe] + util._args_from_interpreter_flags() args += ['-c', cmd % r] pid = util.spawnv_passfds(exe, args, fds_to_pass) except: os.close(w) raise else: self._fd = w self._pid = pid finally: os.close(r) def register(self, name): '''Register name of semaphore with semaphore tracker.''' self._send('REGISTER', name) def unregister(self, name): '''Unregister name of semaphore with semaphore tracker.''' self._send('UNREGISTER', name) def _send(self, cmd, name): self.ensure_running() msg = '{0}:{1}\n'.format(cmd, name).encode('ascii') if len(name) > 512: # posix guarantees that writes to a pipe of less than PIPE_BUF # bytes are atomic, and that PIPE_BUF >= 512 raise ValueError('name too long') nbytes = os.write(self._fd, msg) assert nbytes == len(msg) _semaphore_tracker = SemaphoreTracker() ensure_running = _semaphore_tracker.ensure_running register = _semaphore_tracker.register unregister = _semaphore_tracker.unregister getfd = _semaphore_tracker.getfd def main(fd): '''Run semaphore tracker.''' # protect the process from ^C and "killall python" etc s