Go共享内存机制

Java 中的锁例子

Go 中的锁概念

package mainimport ("sync""testing""time"
)func TestCounter(t *testing.T) {counter := 0for i := 0; i <5000; i++ {go func() {counter++}()}time.Sleep(1*time.Second)t.Logf("counter = %d", counter)
}func TestCounterThreadSafe(t *testing.T) {counter := 0var mut sync.Mutexfor 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 wg sync.WaitGroupvar mut