Named Semaphore

[wbuckel]

Poco has NamedMutex and NamedEvent. Why is there no NamedSemaphore?

I would like to implement a shared memory circular buffer for data exchange between 2 processes (producer - consumer). NamedSemaphores would be perfect for keeping track of available data elements for reading by the consumer. AFAIK named semaphores exist on both Windows and POSIX.

[alex]

I would like to implement a shared memory circular buffer for data exchange between 2 processes (producer - consumer).

In regards to circular buffer, I'd like to turn current Poco::FIFOBuffer into circular buffer with several strategies in regards to buffer growth:

* fixed (no implicit growth, stop receiving data when full)
* expand (when full, allow implicit growth to accommodate new data)
* overwrite (keep fixed size, when full new data overwrites data at the beginning).

As for the contribution, clone pocoproject/poco repo on GitHub and send a pull request against develop branch when you have the patches ready.