2a4f38d54f
The current documentation uses the term "running" for two different things. In the description of get_id() it claims "it will return empty string if the thread is not running", but it actually will return the thread id until wait_to_finish is called. In the description of is_alive() it claims "it will return true if the thread is running", but in this case it means "the provided function hasn't finished running yet". Updated the functions documentation slighly to make this clear.
67 lines
3.6 KiB
XML
67 lines
3.6 KiB
XML
<?xml version="1.0" encoding="UTF-8" ?>
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<class name="Thread" inherits="RefCounted" version="4.1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
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<brief_description>
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A unit of execution in a process.
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</brief_description>
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<description>
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A unit of execution in a process. Can run methods on [Object]s simultaneously. The use of synchronization via [Mutex] or [Semaphore] is advised if working with shared objects.
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[b]Note:[/b] Breakpoints won't break on code if it's running in a thread. This is a current limitation of the GDScript debugger.
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</description>
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<tutorials>
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<link title="Using multiple threads">$DOCS_URL/tutorials/performance/using_multiple_threads.html</link>
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<link title="Thread-safe APIs">$DOCS_URL/tutorials/performance/thread_safe_apis.html</link>
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<link title="3D Voxel Demo">https://godotengine.org/asset-library/asset/676</link>
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</tutorials>
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<methods>
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<method name="get_id" qualifiers="const">
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<return type="String" />
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<description>
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Returns the current [Thread]'s ID, uniquely identifying it among all threads. If the [Thread] has not started running or if [method wait_to_finish] has been called, this returns an empty string.
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</description>
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</method>
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<method name="is_alive" qualifiers="const">
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<return type="bool" />
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<description>
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Returns [code]true[/code] if this [Thread] is currently running the provided function. This is useful for determining if [method wait_to_finish] can be called without blocking the calling thread.
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To check if a [Thread] is joinable, use [method is_started].
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</description>
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</method>
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<method name="is_started" qualifiers="const">
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<return type="bool" />
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<description>
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Returns [code]true[/code] if this [Thread] has been started. Once started, this will return [code]true[/code] until it is joined using [method wait_to_finish]. For checking if a [Thread] is still executing its task, use [method is_alive].
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</description>
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</method>
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<method name="start">
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<return type="int" enum="Error" />
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<param index="0" name="callable" type="Callable" />
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<param index="1" name="priority" type="int" enum="Thread.Priority" default="1" />
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<description>
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Starts a new [Thread] that calls [param callable].
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If the method takes some arguments, you can pass them using [method Callable.bind].
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The [param priority] of the [Thread] can be changed by passing a value from the [enum Priority] enum.
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Returns [constant OK] on success, or [constant ERR_CANT_CREATE] on failure.
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</description>
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</method>
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<method name="wait_to_finish">
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<return type="Variant" />
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<description>
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Joins the [Thread] and waits for it to finish. Returns the output of the [Callable] passed to [method start].
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Should either be used when you want to retrieve the value returned from the method called by the [Thread] or before freeing the instance that contains the [Thread].
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To determine if this can be called without blocking the calling thread, check if [method is_alive] is [code]false[/code].
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[b]Note:[/b] After the [Thread] finishes joining it will be disposed. If you want to use it again you will have to create a new instance of it.
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</description>
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</method>
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</methods>
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<constants>
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<constant name="PRIORITY_LOW" value="0" enum="Priority">
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A thread running with lower priority than normally.
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</constant>
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<constant name="PRIORITY_NORMAL" value="1" enum="Priority">
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A thread with a standard priority.
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</constant>
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<constant name="PRIORITY_HIGH" value="2" enum="Priority">
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A thread running with higher priority than normally.
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</constant>
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</constants>
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</class>
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