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94 lines
3.3 KiB
Python
94 lines
3.3 KiB
Python
"""
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# Copyright (c) 2025 PaddlePaddle Authors. All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""
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from multiprocessing.shared_memory import SharedMemory
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import numpy as np
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def shared_memory_exists(name: str) -> bool:
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"""Check if a shared memory block with the given name exists.
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Args:
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name: The unique identifier of the shared memory block.
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Returns:
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True if the shared memory exists, False otherwise.
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"""
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try:
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shm = SharedMemory(name=name, create=False)
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shm.close()
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return True
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except FileNotFoundError:
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return False
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except Exception as e:
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print(f"Unexpected error: {e}")
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return False
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class IPCSignal:
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"""A shared memory wrapper for inter-process communication using numpy arrays.
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Allows creating or connecting to existing shared memory blocks and synchronizing
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numpy array data between processes.
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Attributes:
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shm: The underlying SharedMemory object.
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value: Numpy array interface to the shared memory buffer.
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"""
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def __init__(
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self,
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name: str,
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array: np.ndarray,
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dtype: np.dtype,
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suffix: int = None,
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create: bool = True,
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) -> None:
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"""Initialize or connect to a shared memory block.
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Args:
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name: Unique identifier for the shared memory block.
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array: Numpy array template defining shape and data type.
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dtype: Data type of the array (must match array.dtype).
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suffix: Suffix number that will be appended to the name.
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create: If True, creates new memory block; otherwise connects to existing.
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Raises:
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AssertionError: If create=True but memory already exists, or dtype mismatch.
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"""
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assert isinstance(array, np.ndarray), "Input must be a numpy array"
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assert dtype == array.dtype, "Specified dtype must match array dtype"
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# Set a suffix for name to avoid name conflict while there are multiple engine launched
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if suffix is not None:
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name = name + f".{suffix}"
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if create:
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assert not shared_memory_exists(name), f"ShareMemory: {name} already exists"
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self.shm = SharedMemory(create=True, size=array.nbytes, name=name)
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self.value: np.ndarray = np.ndarray(array.shape, dtype=array.dtype, buffer=self.shm.buf)
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self.value[:] = array # Initialize with input array data
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else:
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self.shm = SharedMemory(name=name)
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self.value: np.ndarray = np.ndarray(array.shape, dtype=array.dtype, buffer=self.shm.buf)
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def clear(self) -> None:
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"""Release system resources and unlink the shared memory block."""
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if shared_memory_exists(self.shm.name):
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self.shm.close()
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self.shm.unlink()
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