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

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1 747 jeremybenn 
// Copyright 2011 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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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 testWaitGroup(t *testing.T, wg1 *WaitGroup, wg2 *WaitGroup) {
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        n := 16
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        wg1.Add(n)
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        wg2.Add(n)
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        exited := make(chan bool, n)
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        for i := 0; i != n; i++ {
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                go func(i int) {
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                        wg1.Done()
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                        wg2.Wait()
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                        exited <- true
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                }(i)
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        }
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        wg1.Wait()
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        for i := 0; i != n; i++ {
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                select {
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                case <-exited:
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                        t.Fatal("WaitGroup released group too soon")
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                default:
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                }
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                wg2.Done()
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        }
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        for i := 0; i != n; i++ {
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                <-exited // Will block if barrier fails to unlock someone.
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        }
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}
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func TestWaitGroup(t *testing.T) {
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        wg1 := &WaitGroup{}
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        wg2 := &WaitGroup{}
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        // Run the same test a few times to ensure barrier is in a proper state.
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        for i := 0; i != 8; i++ {
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                testWaitGroup(t, wg1, wg2)
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        }
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}
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func TestWaitGroupMisuse(t *testing.T) {
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        defer func() {
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                err := recover()
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                if err != "sync: negative WaitGroup count" {
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                        t.Fatalf("Unexpected panic: %#v", err)
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                }
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        }()
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        wg := &WaitGroup{}
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        wg.Add(1)
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        wg.Done()
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        wg.Done()
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        t.Fatal("Should panic")
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}
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func BenchmarkWaitGroupUncontended(b *testing.B) {
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        type PaddedWaitGroup struct {
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                WaitGroup
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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 wg PaddedWaitGroup
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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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                                        wg.Add(1)
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                                        wg.Done()
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                                        wg.Wait()
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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 benchmarkWaitGroupAddDone(b *testing.B, localWork int) {
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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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        var wg WaitGroup
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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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                                        wg.Add(1)
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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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                                        wg.Done()
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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 BenchmarkWaitGroupAddDone(b *testing.B) {
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        benchmarkWaitGroupAddDone(b, 0)
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}
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func BenchmarkWaitGroupAddDoneWork(b *testing.B) {
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        benchmarkWaitGroupAddDone(b, 100)
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}
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func benchmarkWaitGroupWait(b *testing.B, localWork int) {
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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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        var wg WaitGroup
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        wg.Add(procs)
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        for p := 0; p < procs; p++ {
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                go wg.Done()
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        }
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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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                                        wg.Wait()
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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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                        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 BenchmarkWaitGroupWait(b *testing.B) {
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        benchmarkWaitGroupWait(b, 0)
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}
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func BenchmarkWaitGroupWaitWork(b *testing.B) {
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        benchmarkWaitGroupWait(b, 100)
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}

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