#19 Status fetching implementation

The idea is to allow stats & status fetching.

A simple solution can be a dedicated process, listening on localhost UDP, and replying to a simple query language.

The better place to collect stats seems to be in the pool_handling process (but stats collecting component has to be written).

The problem of a pool_handling process child is the case where the pool_handling process exits… PyFCGI will not reply anymore on local UDP…

A solution is to spawn a dedicated UDP server child from master process. Then the pool handling process will spawn a child for stats collection access. Both UDP server & stats collection process will communicate through a named pipe (with a name shared from the master process).

This component implies multiple tasks :

• write the stats collecting mechanism #20
• write the UDP server child #21
• write the stats collection child #22
• write the UDP server <-> stats collection IPC through named pipe #23

The stats collection child is not needed :

The master process can start/monitor the shared memory and the semaphore for Stats proc & pool_handling proc IPC…

Note : a single semid can be use for the whole programm, a single semid with 3 semaphores.

• the existing pool idle semaphore
• the request counter semaphore
• the stats proc <-> pool_handler proc IPC semaphore