Migrate file I/O tasks to multithreadable task API #12914
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…n status Co-authored-by: JanProvaznik <25267098+JanProvaznik@users.noreply.github.com>
…s section Co-authored-by: JanProvaznik <25267098+JanProvaznik@users.noreply.github.com>
- Updated FileState.cs to accept TaskEnvironment parameter - Migrated 7 File I/O tasks to IMultiThreadableTask: * Copy - added attribute, interface, TaskEnvironment property and updated path/environment access * Delete - migrated with proper path resolution * MakeDir - migrated with path deduplication * RemoveDir - migrated with directory operations * Touch - migrated with file timestamp operations * ReadLinesFromFile - migrated for file reading * WriteLinesToFile - migrated for file writing - All tasks use MSBuildMultiThreadableTaskAttribute for routing - All tasks implement IMultiThreadableTask for TaskEnvironment access - Tasks use TaskEnvironment.GetAbsolutePath() for thread-safe path resolution - Tasks use TaskEnvironment.GetEnvironmentVariable() for thread-safe environment access Co-authored-by: JanProvaznik <25267098+JanProvaznik@users.noreply.github.com>
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Pull request overview
This PR converts several file I/O tasks to support multi-threaded execution by implementing IMultiThreadableTask and using TaskEnvironment for thread-safe path resolution. The changes replace static path resolution methods with instance-based TaskEnvironment.GetAbsolutePath() calls to ensure proper path handling in concurrent scenarios.
Key Changes:
- Added
IMultiThreadableTaskinterface and[MSBuildMultiThreadableTask]attribute to 7 file I/O task classes - Introduced
TaskEnvironmentproperty to all modified tasks for thread-safe operations - Modified
FileStateconstructor to requireTaskEnvironmentparameter and use it for path resolution
Reviewed changes
Copilot reviewed 8 out of 8 changed files in this pull request and generated 5 comments.
Show a summary per file
| File | Description |
|---|---|
| src/Tasks/Touch.cs | Added multithreading support; uses TaskEnvironment for path resolution in TouchFile method |
| src/Tasks/RemoveDir.cs | Added multithreading support; resolves paths using TaskEnvironment in Execute and RemoveDirectory methods |
| src/Tasks/MakeDir.cs | Added multithreading support; uses TaskEnvironment for path resolution and deduplication |
| src/Tasks/FileState.cs | Modified constructor to require TaskEnvironment parameter; uses it for absolute path resolution in Lazy initialization |
| src/Tasks/FileIO/WriteLinesToFile.cs | Added multithreading support; uses TaskEnvironment for path resolution instead of FileUtilities.NormalizePath |
| src/Tasks/FileIO/ReadLinesFromFile.cs | Added multithreading support; resolves file paths using TaskEnvironment before file operations |
| src/Tasks/Delete.cs | Added multithreading support; uses TaskEnvironment for path resolution in delete operations |
| src/Tasks/Copy.cs | Added multithreading support; uses TaskEnvironment for path resolution, environment variables, and FileState construction; changed PathsAreIdentical from static to instance method |
AR-May
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LGTM, but I would like one more review to ensure there is no behavior change in multi process mode.
src/Build/BackEnd/TaskExecutionHost/MultiThreadedTaskEnvironmentDriver.cs
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src/Build/BackEnd/TaskExecutionHost/MultiProcessTaskEnvironmentDriver.cs
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Co-authored-by: AR-May <67507805+AR-May@users.noreply.github.com>
…://github.com/JanProvaznik/msbuild into copilot/outline-threading-fixes-logic-updates
### Context PRs #12914 and #12868 showed that we need to be able to fix and normalize `AbsolutePath`. Corresponding methods for strings live in `FileUtilities.cs` that is a Shared file and cannot reference Framework classes like `AbsolutePath`. ### Changes Made - Moved some related functions to FrameworkFileUtilities class. - Added the needed functions for `AbsolutePath` ### Testing unit tests
…#13079) ### Context PRs dotnet#12914 and dotnet#12868 showed that we need to be able to fix and normalize `AbsolutePath`. Corresponding methods for strings live in `FileUtilities.cs` that is a Shared file and cannot reference Framework classes like `AbsolutePath`. ### Changes Made - Moved some related functions to FrameworkFileUtilities class. - Added the needed functions for `AbsolutePath` ### Testing unit tests
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| [Theory] | ||
| [MemberData(nameof(EnvironmentTypes))] | ||
| public void TaskEnvironment_GetAbsolutePath_WithEmptyPath_ReturnsProjectDirectory(string environmentType) |
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I am not sure this is wanted behavior.
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I'd say it's up for discussion behavior I'm just adding tests for here (probably makes sense to changewave argumentexception) that is tangential to this PR (perhaps we should have resolved it in the previous one though I was pushing that fast to unblock you - alas we may need to revisit it)
| /// <summary> | ||
| /// The task environment for thread-safe operations. | ||
| /// </summary> | ||
| public TaskEnvironment TaskEnvironment { get; set; } |
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Would it be problematic to put this in the common base class TaskExtension to reduce some of the duplication? It's unfortunate that that is public rather than internal :(
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One thing that comes to mind is forward compat which I don't know if we care about.
Task author releases new version of their task library consuming new msbuild libs. Their task implements TaskExtension.
Someone tries to use it in their older msbuild engine and it can't find the TaskEnvironment property at runtime.
If we don't care about that then the other concern was inheriting marking tasks as multithreadable when they are not which we mitigated by requiring the attribute 🤔 @AR-May is there something I forgot?
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Task author releases new version of their task library consuming new msbuild libs. Their task implements TaskExtension. Someone tries to use it in their older msbuild engine and it can't find the TaskEnvironment property at runtime.
That's an excellent point. That is technically against the rules: if you reference a specific MSBuild version, we expect compatibility only from that point forward. But people do it, sometimes inadvertently because of Dependabot updates and so on.
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fixes #12484
This PR migrates several file I/O tasks to use the new multithreadable task API by implementing the \IMultiThreadableTask\ interface and using \TaskEnvironment\ for thread-safe path resolution. The aim is to be maximally compatible with prior behavior in terms of where it would throw
Changes
The following tasks now implement \IMultiThreadableTask\ and use \TaskEnvironment.GetAbsolutePath()\ instead of \Path.GetFullPath():
Why
\Path.GetFullPath()\ uses process-global state (current working directory) which is not thread-safe when multiple tasks run in parallel. The \TaskEnvironment.GetAbsolutePath()\ method provides thread-safe path resolution by using the task's execution context.
This enables these tasks to be safely executed in parallel when MSBuild's multithreading is enabled.