go version go1.17.7 Mac
package share_mem
import (
"sync"
"testing"
"time"
)
func TestCounter(t *testing.T) {
counter := 0
for i := 0; i < 5000; i++ {
go func() {
counter++
}()
}
time.Sleep(1 * time.Second)
t.Logf("counter = %d", counter)
}
func TestCounterThreadSafe(t *testing.T) {
var mut sync.Mutex
counter := 0
for i := 0; i < 5000; i++ {
go func() {
defer func() {
mut.Unlock()
}()
mut.Lock()
counter++
}()
}
time.Sleep(1 * time.Second)
t.Logf("counter = %d", counter)
}
func TestCounterWaitGroup(t *testing.T) {
var mut sync.Mutex
var wg sync.WaitGroup
counter := 0
for i := 0; i < 5000; i++ {
wg.Add(1)
go func() {
defer func() {
mut.Unlock()
}()
mut.Lock()
counter++
wg.Done()
}()
}
wg.Wait()
t.Logf("counter = %d", counter)
}结果Mac：
igo@igoMacBook 0219 % go test share_mem_test.go
ok command-line-arguments 2.576s结果goland：
/usr/local/go/bin/go tool test2json -t /private/var/folders/0p/379lx5z921lcvpmc7k59c6f40000gn/T/GoLand/___share_mem_test_go.test -test.v -test.paniconexit0 -test.run ^\QTestCounter\E|\QTestCounterThreadSafe\E|\QTestCounterWaitGroup\E$
=== RUN TestCounter
share_mem_test.go:18: counter = 4507
--- PASS: TestCounter (1.00s)
=== RUN TestCounterThreadSafe
share_mem_test.go:35: counter = 5000
--- PASS: TestCounterThreadSafe (1.00s)
=== RUN TestCounterWaitGroup
share_mem_test.go:55: counter = 5000
--- PASS: TestCounterWaitGroup (0.00s)
PASS
Process finished with the exit code 0