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