// Copyright 2013 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// The file contains tests that cannot run under race detector for some reason.
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// +build !race
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package runtime_test
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import (
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"runtime"
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"testing"
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)
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// Syscall tests split stack between Entersyscall and Exitsyscall under race detector.
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func BenchmarkSyscall(b *testing.B) {
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benchmarkSyscall(b, 0, 1)
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}
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func BenchmarkSyscallWork(b *testing.B) {
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benchmarkSyscall(b, 100, 1)
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}
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func BenchmarkSyscallExcess(b *testing.B) {
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benchmarkSyscall(b, 0, 4)
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}
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func BenchmarkSyscallExcessWork(b *testing.B) {
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benchmarkSyscall(b, 100, 4)
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}
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func benchmarkSyscall(b *testing.B, work, excess int) {
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b.SetParallelism(excess)
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b.RunParallel(func(pb *testing.PB) {
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foo := 42
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for pb.Next() {
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runtime.Entersyscall()
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for i := 0; i < work; i++ {
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foo *= 2
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foo /= 2
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}
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runtime.Exitsyscall()
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}
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_ = foo
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})
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}
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