Golang并发地图访问范围

Question

I have a map with objects that needs to be released before clearing the map. I am tempted to iterate over the map and remove/release objects as I walk through it.

Here is a mock up example https://play.golang.org/p/kAtPoUgMsq

Since the only way to iterate the map is through range, how would I synchronize multiple producers and multiple consumers?

I don't want to read lock the map since that would make delete/modifying keys during the iteration impossible.

Answer 1

You do not state all the requirements (e.g. can the release of multiple objects happen simultaneously, etc) but the simplest solution I can think of is to remove elements and launch a release goroutine for each of the removed elements:

for key := range keysToRemove {
    if v, ok := m[k]; ok {
        delete(m, k)
        go release(k, v)
    }
}