2d3428c809
Uploading some snippets I created to help me better understand concurrency in general and specifically concurrency in golang.
81 lines
1.4 KiB
Go
81 lines
1.4 KiB
Go
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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)
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type readMsg struct {
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key int
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sender chan int
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}
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type writeMsg struct {
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key int
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value int
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sender chan bool
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}
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func main() {
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fmt.Println("Hello, go.")
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var readOps uint64
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var writeOps uint64
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var wg sync.WaitGroup
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reads := make(chan readMsg)
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writes := make(chan writeMsg)
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go func() {
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state := make(map[int]int)
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for {
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select {
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case msg := <-reads:
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msg.sender <- state[msg.key]
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case msg := <-writes:
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state[msg.key] = msg.value
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msg.sender <- true
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}
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}
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}()
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// Reads
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for i := 0; i < 100; i += 1 {
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go func() {
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wg.Add(1)
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defer wg.Done()
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for j := 0; j < 100; j += 1 {
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msg := readMsg{
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key: rand.Intn(5),
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sender: make(chan int)}
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reads <- msg
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val := <-msg.sender
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fmt.Printf("Received %d.\n", val)
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atomic.AddUint64(&readOps, 1)
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}
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}()
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}
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// Writes
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for i := 0; i < 100; i += 1 {
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go func() {
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wg.Add(1)
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defer wg.Done()
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for j := 0; j < 100; j += 1 {
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msg := writeMsg{
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key: rand.Intn(5),
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value: rand.Intn(10),
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sender: make(chan bool)}
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writes <- msg
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<-msg.sender
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fmt.Printf("Set %d as %d in state\n", msg.key, msg.value)
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atomic.AddUint64(&writeOps, 1)
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}
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}()
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}
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wg.Wait()
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fmt.Printf("Read ops: %d\tWrite ops: %d\n", atomic.LoadUint64(&readOps), atomic.LoadUint64(&writeOps))
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}
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