tevino / abool Goto Github PK
View Code? Open in Web Editor NEW:bulb: Atomic Boolean library for cleaner Go code, optimized for performance yet simple to use.
License: MIT License
:bulb: Atomic Boolean library for cleaner Go code, optimized for performance yet simple to use.
License: MIT License
The command go mod download github.com/tevino/abool/v2
fails with the following error :
go: github.com/tevino/abool/[email protected]: go.mod has non-.../v2 module path "github.com/tevino/abool" (and .../v2/go.mod does not exist) at revision v2.0.0
Would it be possible to cut a release tag, so that everyone has a clear version number to point to in their go.mod
?
The following piece of code demonstrates the bug.
I initially added this as a test, but was then unable to solve the bug, using only one atomic function.
func TestSetToIfAfterMultipleToggles(t *testing.T) {
v := New() // false
v.Toggle() // true
v.Toggle() // false
v.Toggle() // true
// As v is true, it should now be flipped to false
v.SetToIf(true, false)
expected := false
if v.IsSet() != expected {
t.Fatalf("Toggling the value atleast 3 times, until it's true, `SetToIf(true, false)` should flip v to false, expected: %v, got %v", expected, v.IsSet())
}
}
This happens, as Toggle
just increases the int32 by +1 every time, but SetToIf
only compares the int32 against 1 and 0 (instead of odd and even).
Hey, I've been using something similar to your atomicbool - adapted from https://gist.github.com/mahan/6256149
sync.Mutex
doesn't allow us to examine state. There are cases where we want to examine a lock and if we cannot acquire it, just return.
Consider the scenario where multiple goroutines call a function, and only one of them needs to proceed. The others can return out immediately (like a http handler that needs to do admin work, what if the request was called multiple times, something to say "already in progress" . this atomic bool is perfect for it ).
func (s *Server) DoSomethingImportant(w http.ResponseWriter, r *http.Request) {
// check if we can set it to true and proceed
canProceed := s.DoSomethingImportantInProgress.TestAndSet()
if !canProceed {
// message that we cannot proceed
return
}
defer s.DoSomethingImportantInProgress.UnSet()
// do the rest...
}
Essentially its just the following code. Would you like me to send it as a PR instead ?
func (ab *AtomicBool) TestAndSet() bool {
return atomic.CompareAndSwapInt32((*int32)(ab), 0, 1)
}
can we have an additional operation to change the value from true->false and vice versa, atomically?
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