tvl-depot/users/wpcarro/go/mutex.go
Vincent Ambo 019f8fd211 subtree(users/wpcarro): docking briefcase at '24f5a642'
git-subtree-dir: users/wpcarro
git-subtree-mainline: 464bbcb15c
git-subtree-split: 24f5a642af
Change-Id: I6105b3762b79126b3488359c95978cadb3efa789
2021-12-14 02:15:47 +03:00

53 lines
964 B
Go

package main
import (
"fmt"
"math/rand"
"sync"
"sync/atomic"
"time"
)
func main() {
state := make(map[int]int)
mux := &sync.Mutex{}
var readOps uint64
var writeOps uint64
// Read from state
for i := 0; i < 1000; i += 1 {
for j := 0; j < 100; j += 1 {
go func() {
key := rand.Intn(5)
mux.Lock()
fmt.Printf("state[%d] = %d\n", key, state[key])
mux.Unlock()
atomic.AddUint64(&readOps, 1)
time.Sleep(time.Millisecond)
}()
}
}
// Write to state
for i := 0; i < 10; i += 1 {
for j := 0; j < 100; j += 1 {
go func() {
key := rand.Intn(5)
mux.Lock()
state[key] += 1
mux.Unlock()
fmt.Printf("Wrote to state[%d].\n", key)
atomic.AddUint64(&writeOps, 1)
time.Sleep(time.Millisecond)
}()
}
}
time.Sleep(time.Millisecond)
mux.Lock()
fmt.Printf("State: %v\n", state)
mux.Unlock()
fmt.Printf("Reads: %d\tWrites: %d\n", atomic.LoadUint64(&readOps), atomic.LoadUint64(&writeOps))
}