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runtime: move scheduler code around #4549

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runtime: move scheduler code around #4549

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@aykevl aykevl commented Oct 25, 2024

This moves all scheduler code into a separate file that is only compiled when there's a scheduler in use (the tasks or asyncify scheduler, which are both cooperative). The main goal of this change is to make it easier to add a new "scheduler" based on OS threads.

It also fixes a few subtle issues with -gc=none:

  • runtime.Gosched() panicked. This is now fixed to just return immediately (the only logical thing to do when there's only one goroutine).
  • Timers aren't supported without a scheduler, but the relevant code was still present and would happily add a timer to the queue. It just never ran. So now it exits with a runtime error, similar to any blocking operation.

Other than that, this really just moves code around.

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github-actions bot commented Oct 25, 2024

Size difference with the dev branch:

Binary size difference
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@aykevl aykevl force-pushed the refactor-scheduler branch 3 times, most recently from 4915b43 to a966d9a Compare October 25, 2024 14:59
@aykevl aykevl mentioned this pull request Oct 25, 2024
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aykevl commented Oct 28, 2024

Note: this PR conflicts with some changes I'd like to make to the sync package to make it thread-safe, so waiting until this one is merged before I submit those other PRs (see #4559).

@aykevl aykevl force-pushed the refactor-scheduler branch 2 times, most recently from 825d379 to 074a493 Compare November 1, 2024 08:52
This moves all scheduler code into a separate file that is only compiled
when there's a scheduler in use (the tasks or asyncify scheduler, which
are both cooperative). The main goal of this change is to make it easier
to add a new "scheduler" based on OS threads.

It also fixes a few subtle issues with `-gc=none`:

  - Gosched() panicked. This is now fixed to just return immediately
    (the only logical thing to do when there's only one goroutine).
  - Timers aren't supported without a scheduler, but the relevant code
    was still present and would happily add a timer to the queue. It
    just never ran. So now it exits with a runtime error, similar to any
    blocking operation.
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aykevl commented Nov 8, 2024

Rebased to resolve merge conflicts.

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Drive-by review.

@@ -36,7 +36,8 @@ func procUnpin() {

func waitForEvents() {
mask := riscv.DisableInterrupts()
if !runqueue.Empty() {
runqueue := schedulerRunQueue()
if !(runqueue != nil && runqueue.Empty()) {
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Nit: runqueue == nil || !runqueue.Empty() is clearer to me, but I understand why you write it like this.

Nittier: if rq := schedulerRunQueue(); rq == nil || !rq.Empty() {

Comment on lines +49 to +51
// This function is not actually used, it is only called when hasScheduler
// is true. So we can just return nil here.
return nil
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Nit: panic("unreachable") like scheduler below?

}

func scheduler(returnAtDeadlock bool) {
// This *should* be unreachable.
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Nit: unhelpful comment.

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2 participants