mirror of
https://github.com/godotengine/godot.git
synced 2024-09-20 06:22:24 +00:00
81064cc239
We don't use that info for anything, and it generates unnecessary diffs every time we bump the minor version (and CI failures if we forget to sync some files from opt-in modules (mono, text_server_fb).
43 lines
2.5 KiB
XML
43 lines
2.5 KiB
XML
<?xml version="1.0" encoding="UTF-8" ?>
|
|
<class name="Mutex" inherits="RefCounted" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
|
|
<brief_description>
|
|
A binary [Semaphore] for synchronization of multiple [Thread]s.
|
|
</brief_description>
|
|
<description>
|
|
A synchronization mutex (mutual exclusion). This is used to synchronize multiple [Thread]s, and is equivalent to a binary [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.
|
|
[b]Warning:[/b] Mutexes must be used carefully to avoid deadlocks.
|
|
[b]Warning:[/b] 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 [Thread]'s reference count reaches zero and it is therefore destroyed, it must not have any mutex locked.
|
|
</description>
|
|
<tutorials>
|
|
<link title="Using multiple threads">$DOCS_URL/tutorials/performance/using_multiple_threads.html</link>
|
|
<link title="Thread-safe APIs">$DOCS_URL/tutorials/performance/thread_safe_apis.html</link>
|
|
</tutorials>
|
|
<methods>
|
|
<method name="lock">
|
|
<return type="void" />
|
|
<description>
|
|
Locks this [Mutex], blocks until it is unlocked by the current owner.
|
|
[b]Note:[/b] This function returns without blocking if the thread already has ownership of the mutex.
|
|
</description>
|
|
</method>
|
|
<method name="try_lock">
|
|
<return type="bool" />
|
|
<description>
|
|
Tries locking this [Mutex], but does not block. Returns [code]true[/code] on success, [code]false[/code] otherwise.
|
|
[b]Note:[/b] This function returns [code]true[/code] if the thread already has ownership of the mutex.
|
|
</description>
|
|
</method>
|
|
<method name="unlock">
|
|
<return type="void" />
|
|
<description>
|
|
Unlocks this [Mutex], leaving it to other threads.
|
|
[b]Note:[/b] If a thread called [method lock] or [method try_lock] multiple times while already having ownership of the mutex, it must also call [method unlock] the same number of times in order to unlock it correctly.
|
|
[b]Warning:[/b] Calling [method unlock] more times that [method lock] on a given thread, thus ending up trying to unlock a non-locked mutex, is wrong and may causes crashes or deadlocks.
|
|
</description>
|
|
</method>
|
|
</methods>
|
|
</class>
|