On line 85 in
https://github.com/golang/go/blob/release-branch.go1.12/src/sync/mutex.go ,
the code " old := m.state " is weired because m.state is read and write by
different goroutine.
Why it can't be detected by race condition detector.
I write a function Test with race condition problem.
If put it in src/sync/mutex.go, it can't be detected.
If put it in other package like os.go, it can be detected.
That's weired, anyone has some idea ?
package main
import(
"sync"
"os")
func main(){
sync.Test() // race condition will not detect
os.Test() // race condition will detect}
func Test(){
a := int32(1)
if race.Enabled {
race.Acquire(unsafe.Pointer(&a))
}
go func(){
atomic.CompareAndSwapInt32(&a, 1, 4)
}()
_ = a}
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