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race_test.go
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race_test.go
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package main
import (
"sync"
"sync/atomic"
"testing"
)
// what is race conditions ? access (Read OR Write) with several go routine with same variable
func TestDataRaceConditions(t *testing.T) {
var state int32
for i := 0; i < 10; i++ {
go func(i int) {
state += int32(i)
}(i)
}
}
// how fix it ?
// 1- mutexes : lock go routings for read or writing a variables (globally)
// in mutex if you have more than 1 state for lock and unlock we have a deadlock
func TestDataRaceConditionsFixByMutex(t *testing.T) {
var state int32
var mu sync.RWMutex //read and write lock
//var mu sync.Mutex //only read lock
for i := 0; i < 10; i++ {
go func(i int) {
mu.Lock()
//mu.RLocker() // read lock only
state += int32(i)
mu.Unlock()
//mu.RUnlock() // read unlock only
}(i)
}
}
// 2- atomic values :
func TestDataRaceConditionsFixByAtomic(t *testing.T) {
var state int32
//var state atomic.Value
for i := 0; i < 10; i++ {
go func(i int) {
//state += int32(i)
atomic.AddInt32(&state, int32(i))
}(i)
}
}