Memory leaks with Shared Memory

Hi, I've been playing around with Shared Memory, Semaphores and IPC. I've noticed even though i can restart apache, this shared memory segments remain in memory. This means a poor written script could eat a lot of server's available memory without freeing it back. This is more a question than a feature request. Isn't there a chance for php to keep a record of this shared memory segments? I know some principles, like, each process is independent when running under CGI. Is there not a centralized memory segment which could tell you the other memory segments which are being used by a script? Thank you so much, Andras