How to avoid colliding keys from parallel writes?

[milesj]

@wvwwvwwv

So I have a situation where key A can be inserted into the map from different threads at the same time (a load on-demand flow), resulting in a collision.

What I want is the first thread to start the insertion to "lock" the key until its inserted, and the other threads to wait until the insertion is complete, to avoid multi-insert/collisions.

I thought that HashMap::entry would do this, but it doesn't seem to be the case. Is there a way to achieve this with scc? Or should I do the locking myself?

[wvwwvwwv]

Hi, entry is supposed to act like a named mutex.

but it doesn't seem to be the case.

Can you elaborate on this? If mutual exclusion is not guaranteed on the key, it is a bug.

[milesj]

Ok that's what I thought. I'm double checking my implementation to see if something is off.

[milesj]

Yeah, seems like a bug on my end.. my bad.

[wvwwvwwv]

No problem!