Usage for counters

[stgleb]

Hi, folks.

I've decided to use your CHM implemendation. But i have specifical use case. I use
map for counting, actually freqeuency of words. So you guarantee synchronization of each particular
operation. How can i reach consistency when i

1. read value from map
2. increment it
3. write it back to map

Of source i can use my own global lock, but it will totaly destoys idea of map concurrency.
Shoud i take ConcurrentShard and use it internal RWLock?

[stgleb]

i've used such code

for i := 0; i < len(words); i++ {
        shard := wordsMap.GetShard(words[i])
        shard.RWMutex.Lock()
        count, ok := wordsMap.Get(words[i])

        if ok != true {
            count = 0
        } else {
            count += 1
        }
        wordsMap.Set(words[i], count)
        shard.RWMutex.Unlock()
    }

Could you tell me i'm on the right way?

[wgjak47]

For int counter, I thinks use Atomic is a good idea