mirror of
https://github.com/golang/go
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e3c684777a
The general policy for the current state of js/wasm is that it only has to support tests that are also supported by nacl. The test nilptr3.go makes assumptions about which nil checks can be removed. Since WebAssembly does not signal on reading a null pointer, all nil checks have to be explicit. Updates #18892 Change-Id: I06a687860b8d22ae26b1c391499c0f5183e4c485 Reviewed-on: https://go-review.googlesource.com/110096 Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org> Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
187 lines
4.0 KiB
Go
187 lines
4.0 KiB
Go
// Copyright 2017 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 go test
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// This is a copy of sync/rwmutex_test.go rewritten to test the
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// runtime rwmutex.
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package runtime_test
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import (
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"fmt"
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. "runtime"
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"runtime/debug"
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"sync/atomic"
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"testing"
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)
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func parallelReader(m *RWMutex, clocked chan bool, cunlock *uint32, cdone chan bool) {
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m.RLock()
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clocked <- true
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for atomic.LoadUint32(cunlock) == 0 {
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}
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m.RUnlock()
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cdone <- true
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}
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func doTestParallelReaders(numReaders int) {
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GOMAXPROCS(numReaders + 1)
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var m RWMutex
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clocked := make(chan bool, numReaders)
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var cunlock uint32
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cdone := make(chan bool)
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for i := 0; i < numReaders; i++ {
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go parallelReader(&m, clocked, &cunlock, cdone)
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}
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// Wait for all parallel RLock()s to succeed.
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for i := 0; i < numReaders; i++ {
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<-clocked
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}
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atomic.StoreUint32(&cunlock, 1)
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// Wait for the goroutines to finish.
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for i := 0; i < numReaders; i++ {
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<-cdone
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}
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}
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func TestParallelRWMutexReaders(t *testing.T) {
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if GOARCH == "wasm" {
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t.Skip("wasm has no threads yet")
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}
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defer GOMAXPROCS(GOMAXPROCS(-1))
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// If runtime triggers a forced GC during this test then it will deadlock,
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// since the goroutines can't be stopped/preempted.
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// Disable GC for this test (see issue #10958).
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defer debug.SetGCPercent(debug.SetGCPercent(-1))
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doTestParallelReaders(1)
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doTestParallelReaders(3)
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doTestParallelReaders(4)
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}
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func reader(rwm *RWMutex, num_iterations int, activity *int32, cdone chan bool) {
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for i := 0; i < num_iterations; i++ {
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rwm.RLock()
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n := atomic.AddInt32(activity, 1)
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if n < 1 || n >= 10000 {
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panic(fmt.Sprintf("wlock(%d)\n", n))
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}
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for i := 0; i < 100; i++ {
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}
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atomic.AddInt32(activity, -1)
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rwm.RUnlock()
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}
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cdone <- true
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}
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func writer(rwm *RWMutex, num_iterations int, activity *int32, cdone chan bool) {
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for i := 0; i < num_iterations; i++ {
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rwm.Lock()
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n := atomic.AddInt32(activity, 10000)
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if n != 10000 {
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panic(fmt.Sprintf("wlock(%d)\n", n))
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}
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for i := 0; i < 100; i++ {
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}
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atomic.AddInt32(activity, -10000)
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rwm.Unlock()
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}
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cdone <- true
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}
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func HammerRWMutex(gomaxprocs, numReaders, num_iterations int) {
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GOMAXPROCS(gomaxprocs)
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// Number of active readers + 10000 * number of active writers.
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var activity int32
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var rwm RWMutex
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cdone := make(chan bool)
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go writer(&rwm, num_iterations, &activity, cdone)
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var i int
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for i = 0; i < numReaders/2; i++ {
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go reader(&rwm, num_iterations, &activity, cdone)
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}
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go writer(&rwm, num_iterations, &activity, cdone)
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for ; i < numReaders; i++ {
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go reader(&rwm, num_iterations, &activity, cdone)
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}
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// Wait for the 2 writers and all readers to finish.
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for i := 0; i < 2+numReaders; i++ {
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<-cdone
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}
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}
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func TestRWMutex(t *testing.T) {
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defer GOMAXPROCS(GOMAXPROCS(-1))
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n := 1000
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if testing.Short() {
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n = 5
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}
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HammerRWMutex(1, 1, n)
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HammerRWMutex(1, 3, n)
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HammerRWMutex(1, 10, n)
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HammerRWMutex(4, 1, n)
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HammerRWMutex(4, 3, n)
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HammerRWMutex(4, 10, n)
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HammerRWMutex(10, 1, n)
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HammerRWMutex(10, 3, n)
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HammerRWMutex(10, 10, n)
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HammerRWMutex(10, 5, n)
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}
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func BenchmarkRWMutexUncontended(b *testing.B) {
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type PaddedRWMutex struct {
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RWMutex
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pad [32]uint32
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}
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b.RunParallel(func(pb *testing.PB) {
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var rwm PaddedRWMutex
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for pb.Next() {
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rwm.RLock()
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rwm.RLock()
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rwm.RUnlock()
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rwm.RUnlock()
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rwm.Lock()
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rwm.Unlock()
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}
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})
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}
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func benchmarkRWMutex(b *testing.B, localWork, writeRatio int) {
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var rwm RWMutex
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b.RunParallel(func(pb *testing.PB) {
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foo := 0
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for pb.Next() {
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foo++
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if foo%writeRatio == 0 {
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rwm.Lock()
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rwm.Unlock()
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} else {
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rwm.RLock()
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for i := 0; i != localWork; i += 1 {
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foo *= 2
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foo /= 2
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}
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rwm.RUnlock()
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}
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}
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_ = foo
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})
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}
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func BenchmarkRWMutexWrite100(b *testing.B) {
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benchmarkRWMutex(b, 0, 100)
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}
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func BenchmarkRWMutexWrite10(b *testing.B) {
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benchmarkRWMutex(b, 0, 10)
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}
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func BenchmarkRWMutexWorkWrite100(b *testing.B) {
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benchmarkRWMutex(b, 100, 100)
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}
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func BenchmarkRWMutexWorkWrite10(b *testing.B) {
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benchmarkRWMutex(b, 100, 10)
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}
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