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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))
}
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