mirror of
https://github.com/Relintai/pandemonium_engine.git
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145 lines
3.3 KiB
Markdown
145 lines
3.3 KiB
Markdown
# Thread pool module
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A c++ Godot engine module, that will help you with threading.
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It can also work if threads are not available (like on the javascript backend), in this case it runs jobs on the
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main thread. Jobs themselves can also distribute their work onto multiple frames, and you can set how much time
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is allocated per frame.
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You can access it's setting from the `Project->Project Settings...` menu, in the `ThreadPool` category.
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# Pre-built binaries
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You can grab a pre-built editor binary from the [Broken Seals](https://github.com/Relintai/broken_seals/releases)
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repo, should you want to. It contains all my modules.
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# ThreadPoolJob
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Contains a job that can run on different threads.
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A job is only considered finished, if you set the 'complete' property to 'true'. If multiple threads are available,
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the system will not check for this though, because there is no need.
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If you want to support envioronments that doesn't have threading, you can use:
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```
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bool should_do(const bool just_check = false);
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bool should_return();
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```
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For example:
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```
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func _execute():
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# On the first run this will return true, on subsequest runs it will return false
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if should_do():
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thing1()
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# if you ran out the allocated timeframe in a frame, this will return true
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if should_return():
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return
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if should_do():
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thing2()
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if should_return():
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return
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thing3()
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complete = true
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```
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`should_do`'s optional parameter will let you just query the system, whether you finished a step, without
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incrementing internal couters. This is useful for example to distribute algorithms onto multiple frames.
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For example:
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```
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func _execute():
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if should_do(true):
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while current <= elements.size():
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#do heavy calculations
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current += 1
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if should_return():
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return
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#The heavy calculation finished, increment counters
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should_do()
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if should_return():
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return
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if should_do():
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thing2()
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if should_return():
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return
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thing3()
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complete = true
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```
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This class will need litle tweaks, hopefully I can get to is soon.
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# ThreadPoolExecuteJob
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This will let you run a method uin an another thread, without creating your own jobs.
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Use it through the ThreadPool Singleton. Like:
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```
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ThreadPool.create_execute_job(self, "method", arg1, arg2, ...)
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#or
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ThreadPool.create_execute_job_simple(self, "method")
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```
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This class will need litle tweaks, hopefully I can get to is soon.
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# ThreadPool singleton
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The ThreadPool singleton handles jobs.
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If you have a job, submit it using `add_job`:
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```
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MyJob job = MyJob.new()
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ThreadPool.add_job(job)
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```
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It's api is still a bit messy, it will be cleaned up (hopefully very soon).
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# Building
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1. Get the source code for the engine.
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If you want Godot 3.2:
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```git clone -b 3.2 https://github.com/godotengine/godot.git godot```
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If you want Godot 4.0:
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```git clone https://github.com/godotengine/godot.git godot```
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[last tested commit](https://github.com/godotengine/godot/commit/b7e10141197fdd9b0dbc4cfa7890329510d36540)
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2. Go into Godot's modules directory.
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```
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cd ./godot/modules/
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```
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3. Clone this repository
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```
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git clone https://github.com/Relintai/thread_pool thread_pool
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```
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4. Build Godot. [Tutorial](https://docs.godotengine.org/en/latest/development/compiling/index.html)
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