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[6.0] Concurrency: Guard TG state with a mutex even with cooperative executor #75047

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Merged
merged 2 commits into from
Jul 8, 2024
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[6.0] Concurrency: Guard TG state with a mutex even with cooperative executor #75047

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Concurrency: Guard TG state with a mutex even with cooperative executor
kateinoigakukun Jul 6, 2024
9a6dd7e
Add comment explaining #if guard
ktoso Jul 8, 2024
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7 changes: 6 additions & 1 deletion stdlib/public/Concurrency/TaskGroup.cpp
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Expand Up @@ -292,7 +292,12 @@ class TaskGroupBase : public TaskGroupTaskStatusRecord {
};

protected:
#if SWIFT_STDLIB_SINGLE_THREADED_CONCURRENCY || SWIFT_CONCURRENCY_TASK_TO_THREAD_MODEL
// Guard with SWIFT_THREADING_NONE and not just SWIFT_STDLIB_SINGLE_THREADED_CONCURRENCY
// because the latter just means that the global executor is cooperative,
// but it doesn't mean that the target platform is always single-threaded. For example, on
// wasm32-unknown-wasip1-threads, the global executor is cooperative, but users can still set up their
// own TaskExecutor with multiple threads.
#if SWIFT_THREADING_NONE || SWIFT_CONCURRENCY_TASK_TO_THREAD_MODEL
// Synchronization is simple here. In a single threaded mode, all swift tasks
// run on a single thread so no coordination is needed. In a task-to-thread
// model, only the parent task which created the task group can
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