1. For keeping track of the child processes: use a doubly-linked

1. For keeping track of the child processes: use a doubly-linked
list instead of a singly-linked list.  The resulting list manipulations
are both simpler (fewer special cases) and faster (no need to traverse
then entire list just to find the end).

2. Maintain a free list of prefork_child structures that have been
allocated but are not currently in use.  Allocate from the free list
when possible, in order to avoid churning through malloc() and free().

3. When initializing prefork_child.appname: assign it the same value
as the corresponding field in the parental prefork_simple, instead of
creating a separate copy.  The parental copy will remain valid until
after all the prefork_children are gone.

M    src/libopensrf/osrf_prefork.c

git-svn-id: svn://svn.open-ils.org/OpenSRF/trunk@1888 9efc2488-bf62-4759-914b-345cdb29e865