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Disable automaxprocs on Go 1.25+ #1264

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Disable automaxprocs on Go 1.25+ #1264

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2 changes: 2 additions & 0 deletions rundef/maxprocs.go
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Original file line number Diff line number Diff line change
@@ -1,3 +1,5 @@
//go:build !go1.25

package rundef

import (
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21 changes: 21 additions & 0 deletions rundef/maxprocs_go125.go
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Original file line number Diff line number Diff line change
@@ -0,0 +1,21 @@
//go:build go1.25

package rundef

import (
"context"
"runtime"

"github.com/circleci/ex/o11y"
)

// MaxProcs is a no-op on Go 1.25+
func MaxProcs(ctx context.Context) (err error) {
ctx, span := o11y.StartSpan(ctx, "rundef: max procs")
defer o11y.End(span, &err)

limit := runtime.GOMAXPROCS(0) // Get the limit the go runtime has determined

span.AddField("limit", limit)
return err
}
2 changes: 2 additions & 0 deletions rundef/maxprocs_test.go
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Original file line number Diff line number Diff line change
@@ -1,3 +1,5 @@
//go:build !go1.25

package rundef

import (
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