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