37 lines
1.1 KiB
Python
37 lines
1.1 KiB
Python
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# TLock: OpenSSL lock support on thread-enabled systems. Written by Ray Brown.
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"""TLock
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This module provides the callbacks required by the OpenSSL library in situations
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where it is being entered concurrently by multiple threads. This module is
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enagaged automatically by the PyDTLS package on systems that have Python
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threading support. It does not have client-visible components.
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"""
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from logging import getLogger
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from openssl import *
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try:
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import threading
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except ImportError:
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pass
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_logger = getLogger(__name__)
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DO_DEBUG_LOG = False
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def tlock_init():
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if not globals().has_key("threading"):
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return # nothing to configure
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global _locks
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num_locks = CRYPTO_num_locks()
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_locks = tuple(threading.Lock() for _ in range(num_locks))
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CRYPTO_set_locking_callback(_locking_function)
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def _locking_function(mode, n, file, line):
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if DO_DEBUG_LOG:
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_logger.debug("Thread lock: mode: %d, n: %d, file: %s, line: %d",
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mode, n, file, line)
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if mode & CRYPTO_LOCK:
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_locks[n].acquire()
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else:
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_locks[n].release()
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