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ee17d20245
Now that all processes tied to the same shm stats file now share a common clock source, we introduce the process slot notion in this patch. Each living process registers itself in a map at a free index: each slot stores information about the process' PID and heartbeat. Each process is responsible for updating its heartbeat, a slot is considered as "free" if the heartbeat was never set or if the heartbeat is expired (60 seconds of inactivity). The total number of slots is set to 64, this is on purpose because it allows to easily store the "users" of a given shm object using a 64 bits bitmask. Given that when haproxy is reloaded olders processes are supposed to die eventually, it should be large enough (64 simultaneous processes) to be safe. If we manage to reach this limit someday, more slots could be added by splitting "users" bitmask on multiple 64bits variable.