The shared memory segments, semaphores and related files (*.shm and *.sem) are never being deleted when the process is stopped. shmod_delete and shmop_close function are simply ignored ...

 
class executeThread extends Concentre_Console_Process_Unix
{
    protected function _run()
    {
        for ($i = 0; $i < 10; $i++) {
            // Doing something really important which can't wait: sleeping
            sleep(1);
        }
    }
}
 
 $thread1 = new executeThread();
 $thread1->start();
 
 $thread2 = new executeThread();
 $thread2->start();
 
 
 while ($thread1->isRunning() || $thread2->isRunning()) {
    sleep(1);
 }

I'm running PHP 5.2.6 under debian.
Below I've paste shared memory segments summary output after script execution.

ipcs -m

---- Segmentos memoria compartida ---- key shmid propietario perms bytes nattch estado
0x00000000 34963456 root 666 294912 11 dest
0x00000000 34996225 root 666 557056 11 dest
0x740ebcac 343441410 root 644 10240 0
0x740ebcae 343474179 root 644 10 0
0x740ebcb0 343506948 root 644 10240 0
0x740ebcb2 343539717 root 644 10 0

Seems that when process is forked php is unable to control shared memory. I've try to create segment /semaphore with the same code as in ZendX_Console_Process_Unix class but without forking and it works !

Segments are created and deleted perfectly.