Unreal Engine 4.26 Documentation

Unreal Engine 4.27 Documentation

Unreal Engine 5.0 Documentation

Unreal Engine 5.1 Documentation

Unreal Engine 5.2 Documentation

Unreal Engine 5.3 Documentation

> Unreal Engine API Reference > Runtime > Core > Async > ParallelForWithPreWork > ParallelForWithPreWork

Light Theme

Dark Theme

ParallelForWithPreWork

General purpose parallel for that uses the taskgraph

Choose your operating system:

Windows

macOS

Linux

References

Module	Core
Header	/Engine/Source/Runtime/Core/Public/Async/ParallelFor.h
Include	#include "Async/ParallelFor.h"

Syntax

void ParallelForWithPreWork
(
    int32 Num,
    TFunctionRef< void)> Body,
    TFunctionRef< void()> CurrentThreadWorkToDoBeforeHelping,
    bool bForceSingleThread,
    bool bPumpRenderingThread
)

Remarks

General purpose parallel for that uses the taskgraph

Parameters

Parameter	Description
Num;	number of calls of Body; Body(0), Body(1)....Body(Num - 1)
Body;	Function to call from multiple threads
CurrentThreadWorkToDoBeforeHelping;	The work is performed on the main thread before it starts helping with the ParallelFor proper
bForceSingleThread;	Mostly used for testing, if true, run single threaded instead. Notes: Please add stats around to calls to parallel for and within your lambda as appropriate. Do not clog the task graph with long running tasks or tasks that block.