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5e512b705e
* This implementation adds threads on the side of the client (script debugger). * Some functions of the debugger are optimized. * The profile is also now thread safe using atomics. * The editor can switch between multiple threads when debugging. This PR adds threaded support for the script language debugger. Every thread has its own thread local data and it will connect to the debugger using multiple thread IDs. This means that, now, the editor can receive multiple threads entering debug mode at the same time.
84 lines
5.1 KiB
XML
84 lines
5.1 KiB
XML
<?xml version="1.0" encoding="UTF-8" ?>
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<class name="Thread" inherits="RefCounted" 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]Warning:[/b]
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To ensure proper cleanup without crashes or deadlocks, when a [Thread]'s reference count reaches zero and it is therefore destroyed, the following conditions must be met:
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- It must not have any [Mutex] objects locked.
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- It must not be waiting on any [Semaphore] objects.
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- [method wait_to_finish] should have been called on it.
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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="set_thread_safety_checks_enabled" qualifiers="static">
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<return type="void" />
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<param index="0" name="enabled" type="bool" />
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<description>
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Sets whether the thread safety checks the engine normally performs in methods of certain classes (e.g., [Node]) should happen [b]on the current thread[/b].
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The default, for every thread, is that they are enabled (as if called with [param enabled] being [code]true[/code]).
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Those checks are conservative. That means that they will only succeed in considering a call thread-safe (and therefore allow it to happen) if the engine can guarantee such safety.
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Because of that, there may be cases where the user may want to disable them ([param enabled] being [code]false[/code]) to make certain operations allowed again. By doing so, it becomes the user's responsibility to ensure thread safety (e.g., by using [Mutex]) for those objects that are otherwise protected by the engine.
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[b]Note:[/b] This is an advanced usage of the engine. You are advised to use it only if you know what you are doing and there is no safer way.
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[b]Note:[/b] This is useful for scripts running on either arbitrary [Thread] objects or tasks submitted to the [WorkerThreadPool]. It doesn't apply to code running during [Node] group processing, where the checks will be always performed.
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[b]Note:[/b] Even in the case of having disabled the checks in a [WorkerThreadPool] task, there's no need to re-enable them at the end. The engine will do so.
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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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</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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