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$ lad*j"Tځz@ؔţ ̾ǿ ? """Provides shared memory for direct access across processes. The API of this package is currently provisional. Refer to the documentation for details. """ __all__ = [ 'SharedMemory', 'ShareableList' ] from functools import partial import mmap import os import errno import struct import secrets import types if os.name == "nt": import _winapi _USE_POSIX = False else: import _posixshmem _USE_POSIX = True _O_CREX = os.O_CREAT | os.O_EXCL # FreeBSD (and perhaps other BSDs) limit names to 14 characters. _SHM_SAFE_NAME_LENGTH = 14 # Shared memory block name prefix if _USE_POSIX: _SHM_NAME_PREFIX = '/psm_' else: _SHM_NAME_PREFIX = 'wnsm_' def _make_filename(): "Create a random filename for the shared memory object." # number of random bytes to use for name nbytes = (_SHM_SAFE_NAME_LENGTH - len(_SHM_NAME_PREFIX)) // 2 assert nbytes >= 2, '_SHM_NAME_PREFIX too long' name = _SHM_NAME_PREFIX + secrets.token_hex(nbytes) assert len(name) <= _SHM_SAFE_NAME_LENGTH return name class SharedMemory: """Creates a new shared memory block or attaches to an existing shared memory block. Every shared memory block is assigned a unique name. This enables one process to create a shared memory block with a particular name so that a different process can attach to that same shared memory block using that same name. As a resource for sharing data across processes, shared memory blocks may outlive the original process that created them. When one process no longer needs access to a shared memory block that might still be needed by other processes, the close() method should be called. When a shared memory block is no longer needed by any process, the unlink() method should be called to ensure proper cleanup.""" # Defaults; enables close() and unlink() to run without errors. _name = None _fd = -1 _mmap = None _buf = None _flags = os.O_RDWR _mode = 0o600 _prepend_leading_slash = True if _USE_POSIX else False def __init__(self, name=None, create=False, size=0): if not size >= 0: raise ValueError("'size' must be a positive integer") if create: self._flags = _O_CREX | os.O_RDWR if size == 0: raise ValueError("'size' must be a positive number different from zero") if name is None and not self._flags & os.O_EXCL: raise ValueError("'name' can only be None if create=True") if _USE_POSIX: # POSIX Shared Memory if name is None: while True: name = _make_filename() try: self._fd = _posixshmem.shm_open( name, self._flags, mode=self._mode ) except FileExistsError: continue self._name = name break else: name = "/" + name if self._prepend_leading_slash else name self._fd = _posixshmem.shm_open( name, self._flags, mode=self._mode ) self._name = name try: if create and size: os.ftruncate(self._fd, size) stats = os.fstat(self._fd) size = stats.st_size self._mmap = mmap.mmap(self