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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libgo/] [go/] [sync/] [mutex_test.go] - Blame information for rev 747

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1 747 jeremybenn 
// Copyright 2009 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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// GOMAXPROCS=10 gotest
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package sync_test
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import (
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        "runtime"
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        . "sync"
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        "sync/atomic"
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        "testing"
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)
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func HammerSemaphore(s *uint32, loops int, cdone chan bool) {
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        for i := 0; i < loops; i++ {
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                runtime.Semacquire(s)
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                runtime.Semrelease(s)
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        }
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        cdone <- true
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}
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func TestSemaphore(t *testing.T) {
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        s := new(uint32)
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        *s = 1
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        c := make(chan bool)
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        for i := 0; i < 10; i++ {
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                go HammerSemaphore(s, 1000, c)
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        }
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        for i := 0; i < 10; i++ {
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                <-c
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        }
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}
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func BenchmarkUncontendedSemaphore(b *testing.B) {
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        s := new(uint32)
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        *s = 1
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        HammerSemaphore(s, b.N, make(chan bool, 2))
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}
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func BenchmarkContendedSemaphore(b *testing.B) {
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        b.StopTimer()
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        s := new(uint32)
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        *s = 1
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        c := make(chan bool)
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        defer runtime.GOMAXPROCS(runtime.GOMAXPROCS(2))
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        b.StartTimer()
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        go HammerSemaphore(s, b.N/2, c)
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        go HammerSemaphore(s, b.N/2, c)
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        <-c
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        <-c
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}
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func HammerMutex(m *Mutex, loops int, cdone chan bool) {
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        for i := 0; i < loops; i++ {
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                m.Lock()
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                m.Unlock()
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        }
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        cdone <- true
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}
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func TestMutex(t *testing.T) {
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        m := new(Mutex)
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        c := make(chan bool)
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        for i := 0; i < 10; i++ {
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                go HammerMutex(m, 1000, c)
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        }
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        for i := 0; i < 10; i++ {
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                <-c
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        }
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}
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func TestMutexPanic(t *testing.T) {
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        defer func() {
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                if recover() == nil {
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                        t.Fatalf("unlock of unlocked mutex did not panic")
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                }
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        }()
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        var mu Mutex
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        mu.Lock()
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        mu.Unlock()
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        mu.Unlock()
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}
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func BenchmarkMutexUncontended(b *testing.B) {
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        type PaddedMutex struct {
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                Mutex
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                pad [128]uint8
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        }
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        const CallsPerSched = 1000
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        procs := runtime.GOMAXPROCS(-1)
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        N := int32(b.N / CallsPerSched)
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        c := make(chan bool, procs)
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        for p := 0; p < procs; p++ {
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                go func() {
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                        var mu PaddedMutex
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                        for atomic.AddInt32(&N, -1) >= 0 {
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                                runtime.Gosched()
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                                for g := 0; g < CallsPerSched; g++ {
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                                        mu.Lock()
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                                        mu.Unlock()
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                                }
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                        }
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                        c <- true
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                }()
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        }
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        for p := 0; p < procs; p++ {
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                <-c
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        }
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}
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func benchmarkMutex(b *testing.B, slack, work bool) {
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        const (
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                CallsPerSched  = 1000
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                LocalWork      = 100
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                GoroutineSlack = 10
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        )
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        procs := runtime.GOMAXPROCS(-1)
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        if slack {
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                procs *= GoroutineSlack
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        }
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        N := int32(b.N / CallsPerSched)
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        c := make(chan bool, procs)
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        var mu Mutex
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        for p := 0; p < procs; p++ {
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                go func() {
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                        foo := 0
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                        for atomic.AddInt32(&N, -1) >= 0 {
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                                runtime.Gosched()
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                                for g := 0; g < CallsPerSched; g++ {
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                                        mu.Lock()
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                                        mu.Unlock()
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                                        if work {
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                                                for i := 0; i < LocalWork; i++ {
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                                                        foo *= 2
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                                                        foo /= 2
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                                                }
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                                        }
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                                }
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                        }
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                        c <- foo == 42
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                }()
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        }
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        for p := 0; p < procs; p++ {
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                <-c
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        }
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}
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func BenchmarkMutex(b *testing.B) {
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        benchmarkMutex(b, false, false)
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}
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func BenchmarkMutexSlack(b *testing.B) {
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        benchmarkMutex(b, true, false)
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}
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func BenchmarkMutexWork(b *testing.B) {
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        benchmarkMutex(b, false, true)
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}
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func BenchmarkMutexWorkSlack(b *testing.B) {
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        benchmarkMutex(b, true, true)
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}

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