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Title: Synchronization primitives — Python 3.14.6 documentation

Open Graph Title: Synchronization primitives

Description: The C-API provides a basic mutual exclusion lock. Python critical section API: The critical section API provides a deadlock avoidance layer on top of per-object locks for free-threaded CPython. The...

Open Graph Description: The C-API provides a basic mutual exclusion lock. Python critical section API: The critical section API provides a deadlock avoidance layer on top of per-object locks for free-threaded CPython. The...

Opengraph URL: https://docs.python.org/3/c-api/synchronization.html

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og:image:alt	The C-API provides a basic mutual exclusion lock. Python critical section API: The critical section API provides a deadlock avoidance layer on top of per-object locks for free-threaded CPython. The...
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Links:

	https://www.python.org/
Table of Contents	https://docs.python.org/3/contents.html
Synchronization primitives	https://docs.python.org/3/c-api/synchronization.html
Python critical section API	https://docs.python.org/3/c-api/synchronization.html#python-critical-section-api
Legacy locking APIs	https://docs.python.org/3/c-api/synchronization.html#legacy-locking-apis
Thread states and the global interpreter lock	https://docs.python.org/3/c-api/threads.html
Thread-local storage support	https://docs.python.org/3/c-api/tls.html
Report a bug	https://docs.python.org/3/bugs.html
Improve this page	https://docs.python.org/3/improve-page-nojs.html
Show source	https://github.com/python/cpython/blob/main/Doc/c-api/synchronization.rst?plain=1
index	https://docs.python.org/3/genindex.html
modules	https://docs.python.org/3/py-modindex.html
next	https://docs.python.org/3/c-api/tls.html
previous	https://docs.python.org/3/c-api/threads.html
Python	https://www.python.org/
3.14.6 Documentation	https://docs.python.org/3/index.html
Python/C API reference manual	https://docs.python.org/3/c-api/index.html
Synchronization primitives	https://docs.python.org/3/c-api/synchronization.html
¶	https://docs.python.org/3/c-api/synchronization.html#synchronization-primitives
¶	https://docs.python.org/3/c-api/synchronization.html#c.PyMutex
PyMutex	https://docs.python.org/3/c-api/synchronization.html#c.PyMutex
¶	https://docs.python.org/3/c-api/synchronization.html#c.PyMutex_Lock
Atomic	https://docs.python.org/3/library/threadsafety.html#threadsafety-level-atomic
thread state	https://docs.python.org/3/glossary.html#term-attached-thread-state
PyMutex	https://docs.python.org/3/c-api/synchronization.html#c.PyMutex
¶	https://docs.python.org/3/c-api/synchronization.html#c.PyMutex_Unlock
Atomic	https://docs.python.org/3/library/threadsafety.html#threadsafety-level-atomic
PyMutex	https://docs.python.org/3/c-api/synchronization.html#c.PyMutex
¶	https://docs.python.org/3/c-api/synchronization.html#c.PyMutex_IsLocked
Atomic	https://docs.python.org/3/library/threadsafety.html#threadsafety-level-atomic
¶	https://docs.python.org/3/c-api/synchronization.html#python-critical-section-api
free-threaded	https://docs.python.org/3/glossary.html#term-free-threading
global interpreter lock	https://docs.python.org/3/glossary.html#term-global-interpreter-lock
list	https://docs.python.org/3/library/stdtypes.html#list
dict	https://docs.python.org/3/library/stdtypes.html#dict
PyDict_Next()	https://docs.python.org/3/c-api/dict.html#c.PyDict_Next
PyMutex	https://docs.python.org/3/c-api/synchronization.html#c.PyMutex
PyMutex	https://docs.python.org/3/c-api/synchronization.html#c.PyMutex
PyObject	https://docs.python.org/3/c-api/structures.html#c.PyObject
Py_BEGIN_CRITICAL_SECTION2	https://docs.python.org/3/c-api/synchronization.html#c.Py_BEGIN_CRITICAL_SECTION2
Py_SETREF	https://docs.python.org/3/c-api/refcounting.html#c.Py_SETREF
Py_DECREF	https://docs.python.org/3/c-api/refcounting.html#c.Py_DECREF
PyEval_SaveThread()	https://docs.python.org/3/c-api/threads.html#c.PyEval_SaveThread
¶	https://docs.python.org/3/c-api/synchronization.html#c.Py_BEGIN_CRITICAL_SECTION
¶	https://docs.python.org/3/c-api/synchronization.html#c.Py_BEGIN_CRITICAL_SECTION_MUTEX
Py_BEGIN_CRITICAL_SECTION	https://docs.python.org/3/c-api/synchronization.html#c.Py_BEGIN_CRITICAL_SECTION
PyMutex	https://docs.python.org/3/c-api/synchronization.html#c.PyMutex
¶	https://docs.python.org/3/c-api/synchronization.html#c.Py_END_CRITICAL_SECTION
¶	https://docs.python.org/3/c-api/synchronization.html#c.Py_BEGIN_CRITICAL_SECTION2
¶	https://docs.python.org/3/c-api/synchronization.html#c.Py_BEGIN_CRITICAL_SECTION2_MUTEX
Py_BEGIN_CRITICAL_SECTION2	https://docs.python.org/3/c-api/synchronization.html#c.Py_BEGIN_CRITICAL_SECTION2
PyMutex	https://docs.python.org/3/c-api/synchronization.html#c.PyMutex
¶	https://docs.python.org/3/c-api/synchronization.html#c.Py_END_CRITICAL_SECTION2
¶	https://docs.python.org/3/c-api/synchronization.html#legacy-locking-apis
PyMutex	https://docs.python.org/3/c-api/synchronization.html#c.PyMutex
¶	https://docs.python.org/3/c-api/synchronization.html#c.PyThread_type_lock
¶	https://docs.python.org/3/c-api/synchronization.html#c.PyLockStatus
¶	https://docs.python.org/3/c-api/synchronization.html#c.PY_LOCK_FAILURE
¶	https://docs.python.org/3/c-api/synchronization.html#c.PY_LOCK_ACQUIRED
¶	https://docs.python.org/3/c-api/synchronization.html#c.PY_LOCK_INTR
PyThread_type_lock	https://docs.python.org/3/c-api/synchronization.html#c.PyThread_type_lock
¶	https://docs.python.org/3/c-api/synchronization.html#c.PyThread_allocate_lock
Stable ABI	https://docs.python.org/3/c-api/stable.html#stable
attached thread state	https://docs.python.org/3/glossary.html#term-attached-thread-state
PyThread_type_lock	https://docs.python.org/3/c-api/synchronization.html#c.PyThread_type_lock
¶	https://docs.python.org/3/c-api/synchronization.html#c.PyThread_free_lock
Stable ABI	https://docs.python.org/3/c-api/stable.html#stable
attached thread state	https://docs.python.org/3/glossary.html#term-attached-thread-state
PyLockStatus	https://docs.python.org/3/c-api/synchronization.html#c.PyLockStatus
PyThread_type_lock	https://docs.python.org/3/c-api/synchronization.html#c.PyThread_type_lock
¶	https://docs.python.org/3/c-api/synchronization.html#c.PyThread_acquire_lock_timed
Stable ABI	https://docs.python.org/3/c-api/stable.html#stable
PY_LOCK_FAILURE	https://docs.python.org/3/c-api/synchronization.html#c.PY_LOCK_FAILURE
PY_LOCK_INTR	https://docs.python.org/3/c-api/synchronization.html#c.PY_LOCK_INTR
Py_MakePendingCalls()	https://docs.python.org/3/c-api/threads.html#c.Py_MakePendingCalls
PY_LOCK_ACQUIRED	https://docs.python.org/3/c-api/synchronization.html#c.PY_LOCK_ACQUIRED
attached thread state	https://docs.python.org/3/glossary.html#term-attached-thread-state
PyThread_type_lock	https://docs.python.org/3/c-api/synchronization.html#c.PyThread_type_lock
¶	https://docs.python.org/3/c-api/synchronization.html#c.PyThread_acquire_lock
Stable ABI	https://docs.python.org/3/c-api/stable.html#stable
PyThread_acquire_lock_timed()	https://docs.python.org/3/c-api/synchronization.html#c.PyThread_acquire_lock_timed
attached thread state	https://docs.python.org/3/glossary.html#term-attached-thread-state
PyThread_type_lock	https://docs.python.org/3/c-api/synchronization.html#c.PyThread_type_lock
¶	https://docs.python.org/3/c-api/synchronization.html#c.PyThread_release_lock
Stable ABI	https://docs.python.org/3/c-api/stable.html#stable
attached thread state	https://docs.python.org/3/glossary.html#term-attached-thread-state
Table of Contents	https://docs.python.org/3/contents.html
Synchronization primitives	https://docs.python.org/3/c-api/synchronization.html
Python critical section API	https://docs.python.org/3/c-api/synchronization.html#python-critical-section-api
Legacy locking APIs	https://docs.python.org/3/c-api/synchronization.html#legacy-locking-apis
Thread states and the global interpreter lock	https://docs.python.org/3/c-api/threads.html
Thread-local storage support	https://docs.python.org/3/c-api/tls.html
Report a bug	https://docs.python.org/3/bugs.html
Improve this page	https://docs.python.org/3/improve-page-nojs.html
Show source	https://github.com/python/cpython/blob/main/Doc/c-api/synchronization.rst?plain=1
index	https://docs.python.org/3/genindex.html
modules	https://docs.python.org/3/py-modindex.html
next	https://docs.python.org/3/c-api/tls.html
previous	https://docs.python.org/3/c-api/threads.html
Python	https://www.python.org/
3.14.6 Documentation	https://docs.python.org/3/index.html
Python/C API reference manual	https://docs.python.org/3/c-api/index.html
Synchronization primitives	https://docs.python.org/3/c-api/synchronization.html
Copyright	https://docs.python.org/3/copyright.html
History and License	https://docs.python.org/license.html
Please donate.	https://www.python.org/psf/donations/
Found a bug	https://docs.python.org/bugs.html
Sphinx	https://www.sphinx-doc.org/

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