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Nama	Ukuran	Aksi
dummy	-	Open
__pycache__	-	Open
connection.py	31.11 MB	View DL Edit
context.py	10.99 MB	View DL Edit
forkserver.py	11.86 MB	View DL Edit
heap.py	11.35 MB	View DL Edit
managers.py	46.19 MB	View DL Edit
pool.py	31.79 MB	View DL Edit
popen_fork.py	2.32 MB	View DL Edit
popen_forkserver.py	2.18 MB	View DL Edit
popen_spawn_posix.py	1.98 MB	View DL Edit
popen_spawn_win32.py	3.92 MB	View DL Edit
process.py	11.72 MB	View DL Edit
queues.py	11.74 MB	View DL Edit
reduction.py	9.29 MB	View DL Edit
resource_sharer.py	5.01 MB	View DL Edit
resource_tracker.py	8.41 MB	View DL Edit
sharedctypes.py	6.16 MB	View DL Edit
shared_memory.py	17.96 MB	View DL Edit
spawn.py	9.08 MB	View DL Edit
synchronize.py	11.34 MB	View DL Edit
util.py	13.68 MB	View DL Edit
__init__.py	916 B	View DL Edit

Edit file: /lib64/python3.9/multiprocessing/resource_tracker.py

###############################################################################
# Server process to keep track of unlinked resources (like shared memory
# segments, semaphores etc.) and clean them.
#
# On Unix we run a server process which keeps track of unlinked
# resources. 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 resource names.
#
# This is important because there may be system limits for such resources: for
# instance, the system only supports a limited number of named semaphores, and
# shared-memory segments live in the RAM. If a python process leaks such a
# resource, this resource will not be removed till the next reboot.  Without
# this resource tracker process, "killall python" would probably leave unlinked
# resources.

import os
import signal
import sys
import threading
import warnings

from . import spawn
from . import util

__all__ = ['ensure_running', 'register', 'unregister']

_HAVE_SIGMASK = hasattr(signal, 'pthread_sigmask')
_IGNORED_SIGNALS = (signal.SIGINT, signal.SIGTERM)

_CLEANUP_FUNCS = {
    'noop': lambda: None,
}

if os.name == 'posix':
    import _multiprocessing
    import _posixshmem

_CLEANUP_FUNCS.update({
        'semaphore': _multiprocessing.sem_unlink,
        'shared_memory': _posixshmem.shm_unlink,
    })

class ResourceTracker(object):

def __init__(self):
        self._lock = threading.Lock()
        self._fd = None
        self._pid = None

def _stop(self):
        with self._lock:
            if self._fd is None:
                # not running
                return

# closing the "alive" file descriptor stops main()
            os.close(self._fd)
            self._fd = None

os.waitpid(self._pid, 0)
            self._pid = None

def getfd(self):
        self.ensure_running()
        return self._fd

def ensure_running(self):
        '''Make sure that resource tracker process is running.

This can be run from any process.  Usually a child process will use
        the resource created by its parent.'''
        with self._lock:
            if self._fd is not None:
                # resource tracker was launched before, is it still running?
                if self._check_alive():
                    # => still alive
                    return
                # => dead, launch it again
                os.close(self._fd)

# Clean-up to avoid dangling processes.
                try:
                    # _pid can be None if this process is a child from another
                    # python process, which has started the resource_tracker.
                    if self._pid is not None:
                        os.waitpid(self._pid, 0)
                except ChildProcessError:
                    # The resource_tracker has already been terminated.
                    pass
                self._fd = None
                self._pid = None

warnings.warn('resource_tracker: process died unexpectedly, '
                              'relaunching.  Some resources might leak.')

fds_to_pass = []
            try:
                fds_to_pass.append(sys.stderr.fileno())
            except Exception:
                pass
            cmd = 'from multiprocessing.resource_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]
                # bpo-33613: Register a signal mask that will block the signals.
                # This signal mask will be inherited by the child that is going
                # to be spawned and will protect the child from a race condition
                # that can make the child die before it registers signal handlers
                # for SIGINT and SIGTERM. The mask is unregistered after spawning
                # the child.
                try:
                    if _HAVE_SIGMASK:
                        signal.pthread_sigmask(signal.SIG_BLOCK, _IGNORED_SIGNALS)
                    pid = util.spawnv_passfds(exe, args, fds_to_pass)
                finally:
                    if _HAVE_SIGMASK:
                        signal.pthread_sigmask(signal.SIG_UNBLOCK, _IGNORED_SIGNALS)
            except:
                os.close(w)
                raise
            else:
                self._fd = w
                self._pid = pid
            finally:
                os.close(r)

def _check_alive(self):
        '''Check that the pipe has not been closed by sending a probe.'''
        try:
            # We cannot use send here as it calls ensure_running, creating
            # a cycle.
            os.write(self._fd, b'PROBE:0:noop\n')
        except OSError:
            return False
        else:
            return True

def register(self, name, rtype):
        '''Register name of resource with resource tracker.'''
        self._send('REGISTER', name, rtype)

def unregister(self, name, rtype):
        '''Unregister name of resource with resource tracker.'''
        self._send('UNREGISTER', name, rtype)

def _send(self, cmd, name, rtype):
        self.ensure_running()
        msg = '{0}:{1}:{2}\n'.format(cmd, name, rtype).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), "nbytes {0:n} but len(msg) {1:n}".format(
            nbytes, len(msg))

_resource_tracker = ResourceTracker()
ensure_running = _resource_tracker.ensure_running
register = _resource_tracker.register
unregister = _resource_tracker.unregister
getfd = _resource_tracker.getfd

def main(fd):
    '''Run resource tracker.'''
    # protect the process from ^C and "killall python" etc
    signal.signal(signal.SIGINT, signal.SIG_IGN)
    signal.signal(signal.SIGTERM, signal.SIG_IGN)
    if _HAVE_SIGMASK:
        signal.pthread_sigmask(signal.SIG_UNBLOCK, _IGNORED_SIGNALS)

for f in (sys.stdin, sys.stdout):
        try:
            f.close()
        except Exception:
            pass

cache = {rtype: set() for rtype in _CLEANUP_FUNCS.keys()}
    try:
        # keep track of registered/unregistered resources
        with open(fd, 'rb') as f:
            for line in f:
                try:
                    cmd, name, rtype = line.strip().decode('ascii').split(':')
                    cleanup_func = _CLEANUP_FUNCS.get(rtype, None)
                    if cleanup_func is None:
                        raise ValueError(
                            f'Cannot register {name} for automatic cleanup: '
                            f'unknown resource type {rtype}')

if cmd == 'REGISTER':
                        cache[rtype].add(name)
                    elif cmd == 'UNREGISTER':
                        cache[rtype].remove(name)
                    elif cmd == 'PROBE':
                        pass
                    else:
                        raise RuntimeError('unrecognized command %r' % cmd)
                except Exception:
                    try:
                        sys.excepthook(*sys.exc_info())
                    except:
                        pass
    finally:
        # all processes have terminated; cleanup any remaining resources
        for rtype, rtype_cache in cache.items():
            if rtype_cache:
                try:
                    warnings.warn('resource_tracker: There appear to be %d '
                                  'leaked %s objects to clean up at shutdown' %
                                  (len(rtype_cache), rtype))
                except Exception:
                    pass
            for name in rtype_cache:
                # For some reason the process which created and registered this
                # resource has failed to unregister it. Presumably it has
                # died.  We therefore unlink it.
                try:
                    try:
                        _CLEANUP_FUNCS[rtype](name)
                    except Exception as e:
                        warnings.warn('resource_tracker: %r: %s' % (name, e))
                finally:
                    pass

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