mirror of
https://github.com/godotengine/godot-docs.git
synced 2025-12-31 17:49:03 +03:00
116 lines
4.7 KiB
ReStructuredText
116 lines
4.7 KiB
ReStructuredText
:github_url: hide
|
|
|
|
.. DO NOT EDIT THIS FILE!!!
|
|
.. Generated automatically from Godot engine sources.
|
|
.. Generator: https://github.com/godotengine/godot/tree/master/doc/tools/make_rst.py.
|
|
.. XML source: https://github.com/godotengine/godot/tree/master/doc/classes/Mutex.xml.
|
|
|
|
.. _class_Mutex:
|
|
|
|
Mutex
|
|
=====
|
|
|
|
**Inherits:** :ref:`RefCounted<class_RefCounted>` **<** :ref:`Object<class_Object>`
|
|
|
|
A binary :ref:`Semaphore<class_Semaphore>` for synchronization of multiple :ref:`Thread<class_Thread>`\ s.
|
|
|
|
.. rst-class:: classref-introduction-group
|
|
|
|
Description
|
|
-----------
|
|
|
|
A synchronization mutex (mutual exclusion). This is used to synchronize multiple :ref:`Thread<class_Thread>`\ s, and is equivalent to a binary :ref:`Semaphore<class_Semaphore>`. It guarantees that only one thread can access a critical section at a time.
|
|
|
|
This is a reentrant mutex, meaning that it can be locked multiple times by one thread, provided it also unlocks it as many times.
|
|
|
|
\ **Warning:** Mutexes must be used carefully to avoid deadlocks.
|
|
|
|
\ **Warning:** To ensure proper cleanup without crashes or deadlocks, the following conditions must be met:
|
|
|
|
- When a **Mutex**'s reference count reaches zero and it is therefore destroyed, no threads (including the one on which the destruction will happen) must have it locked.
|
|
|
|
- When a :ref:`Thread<class_Thread>`'s reference count reaches zero and it is therefore destroyed, it must not have any mutex locked.
|
|
|
|
.. rst-class:: classref-introduction-group
|
|
|
|
Tutorials
|
|
---------
|
|
|
|
- :doc:`Using multiple threads <../tutorials/performance/using_multiple_threads>`
|
|
|
|
- :doc:`Thread-safe APIs <../tutorials/performance/thread_safe_apis>`
|
|
|
|
.. rst-class:: classref-reftable-group
|
|
|
|
Methods
|
|
-------
|
|
|
|
.. table::
|
|
:widths: auto
|
|
|
|
+-------------------------+----------------------------------------------------+
|
|
| |void| | :ref:`lock<class_Mutex_method_lock>`\ (\ ) |
|
|
+-------------------------+----------------------------------------------------+
|
|
| :ref:`bool<class_bool>` | :ref:`try_lock<class_Mutex_method_try_lock>`\ (\ ) |
|
|
+-------------------------+----------------------------------------------------+
|
|
| |void| | :ref:`unlock<class_Mutex_method_unlock>`\ (\ ) |
|
|
+-------------------------+----------------------------------------------------+
|
|
|
|
.. rst-class:: classref-section-separator
|
|
|
|
----
|
|
|
|
.. rst-class:: classref-descriptions-group
|
|
|
|
Method Descriptions
|
|
-------------------
|
|
|
|
.. _class_Mutex_method_lock:
|
|
|
|
.. rst-class:: classref-method
|
|
|
|
|void| **lock**\ (\ ) :ref:`🔗<class_Mutex_method_lock>`
|
|
|
|
Locks this **Mutex**, blocks until it is unlocked by the current owner.
|
|
|
|
\ **Note:** This function returns without blocking if the thread already has ownership of the mutex.
|
|
|
|
.. rst-class:: classref-item-separator
|
|
|
|
----
|
|
|
|
.. _class_Mutex_method_try_lock:
|
|
|
|
.. rst-class:: classref-method
|
|
|
|
:ref:`bool<class_bool>` **try_lock**\ (\ ) :ref:`🔗<class_Mutex_method_try_lock>`
|
|
|
|
Tries locking this **Mutex**, but does not block. Returns ``true`` on success, ``false`` otherwise.
|
|
|
|
\ **Note:** This function returns ``true`` if the thread already has ownership of the mutex.
|
|
|
|
.. rst-class:: classref-item-separator
|
|
|
|
----
|
|
|
|
.. _class_Mutex_method_unlock:
|
|
|
|
.. rst-class:: classref-method
|
|
|
|
|void| **unlock**\ (\ ) :ref:`🔗<class_Mutex_method_unlock>`
|
|
|
|
Unlocks this **Mutex**, leaving it to other threads.
|
|
|
|
\ **Note:** If a thread called :ref:`lock()<class_Mutex_method_lock>` or :ref:`try_lock()<class_Mutex_method_try_lock>` multiple times while already having ownership of the mutex, it must also call :ref:`unlock()<class_Mutex_method_unlock>` the same number of times in order to unlock it correctly.
|
|
|
|
\ **Warning:** Calling :ref:`unlock()<class_Mutex_method_unlock>` more times that :ref:`lock()<class_Mutex_method_lock>` on a given thread, thus ending up trying to unlock a non-locked mutex, is wrong and may causes crashes or deadlocks.
|
|
|
|
.. |virtual| replace:: :abbr:`virtual (This method should typically be overridden by the user to have any effect.)`
|
|
.. |const| replace:: :abbr:`const (This method has no side effects. It doesn't modify any of the instance's member variables.)`
|
|
.. |vararg| replace:: :abbr:`vararg (This method accepts any number of arguments after the ones described here.)`
|
|
.. |constructor| replace:: :abbr:`constructor (This method is used to construct a type.)`
|
|
.. |static| replace:: :abbr:`static (This method doesn't need an instance to be called, so it can be called directly using the class name.)`
|
|
.. |operator| replace:: :abbr:`operator (This method describes a valid operator to use with this type as left-hand operand.)`
|
|
.. |bitfield| replace:: :abbr:`BitField (This value is an integer composed as a bitmask of the following flags.)`
|
|
.. |void| replace:: :abbr:`void (No return value.)`
|