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package gls
var (
stackTagPool = &idPool{}
)
// Will return this goroutine's identifier if set. If you always need a
// goroutine identifier, you should use EnsureGoroutineId which will make one
// if there isn't one already.
func GetGoroutineId() (gid uint, ok bool) {
return readStackTag()
}
// Will call cb with the current goroutine identifier. If one hasn't already
// been generated, one will be created and set first. The goroutine identifier
// might be invalid after cb returns.
func EnsureGoroutineId(cb func(gid uint)) {
if gid, ok := readStackTag(); ok {
cb(gid)
return
}
gid := stackTagPool.Acquire()
defer stackTagPool.Release(gid)
addStackTag(gid, func() { cb(gid) })
}
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