shenleiandClaude Opus 5
5fad769ee8
The embedded 40250 script layer needs its own interpreter on five platforms. 2.7 is end-of-life, so nothing can be fetched from the target SDKs and the source is vendored (official 2.7.18 tarball, trimmed to 25MB; Lib/ stays for step 3's python27.zip). cpython-2.7.18/CMakeLists.txt builds one `mtpython` static library from exactly the 133 objects the reference libpython2.7.a contains, off by default behind -DMTGODOT_EMBED_PYTHON=ON. The source list and the built-in module table (config/config.c, 39 entries) are shared; pyconfig.h is a probe result and is not, so each platform keeps its own under config/<platform>/, regenerated by tools/py_embed/gen_pyconfig.sh and checked against the shared table. Three vendor patches, documented in docs/THIRD-PARTY.md: configure/configure.ac learn arm64 on macOS, and posixmodule.c undefines the process-control calls it hard-defines past pyconfig.h when building for iOS. macOS (ctest python.embed: every builtin imports, codecs and pickle work off the vendored Lib/), Android arm64 and iOS arm64 build. Linux needs a Linux host and Windows needs a MinGW-vs-MSVC decision; both are noted for step 4. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
56 lines
1.8 KiB
Python
56 lines
1.8 KiB
Python
"""Mutual exclusion -- for use with module sched
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A mutex has two pieces of state -- a 'locked' bit and a queue.
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When the mutex is not locked, the queue is empty.
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Otherwise, the queue contains 0 or more (function, argument) pairs
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representing functions (or methods) waiting to acquire the lock.
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When the mutex is unlocked while the queue is not empty,
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the first queue entry is removed and its function(argument) pair called,
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implying it now has the lock.
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Of course, no multi-threading is implied -- hence the funny interface
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for lock, where a function is called once the lock is acquired.
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"""
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from warnings import warnpy3k
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warnpy3k("the mutex module has been removed in Python 3.0", stacklevel=2)
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del warnpy3k
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from collections import deque
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class mutex:
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def __init__(self):
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"""Create a new mutex -- initially unlocked."""
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self.locked = False
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self.queue = deque()
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def test(self):
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"""Test the locked bit of the mutex."""
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return self.locked
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def testandset(self):
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"""Atomic test-and-set -- grab the lock if it is not set,
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return True if it succeeded."""
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if not self.locked:
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self.locked = True
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return True
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else:
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return False
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def lock(self, function, argument):
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"""Lock a mutex, call the function with supplied argument
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when it is acquired. If the mutex is already locked, place
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function and argument in the queue."""
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if self.testandset():
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function(argument)
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else:
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self.queue.append((function, argument))
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def unlock(self):
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"""Unlock a mutex. If the queue is not empty, call the next
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function with its argument."""
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if self.queue:
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function, argument = self.queue.popleft()
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function(argument)
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else:
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self.locked = False
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