AIX Version 4.3 Differences Guide

kernel extension to detect process termination. This is still preferable however to
the previous function of SRC that would not detect subsystem failure at all in this
situation.
If you run the lssrc command with the -S flag, you receive a list of the subsystem
attributes. The action is set to -R (for respawn) or -O (for once). The value of
action must be -R to have the subsystem restarted. Also, there is a retry limit. If
the subsystem fails more than once within the configured waittime (20 seconds
by default), it will not be restarted.
The action and waittime attributes can be set using the mkssys command or
changed with the chssys command.
This new feature of the srcmstr daemon can be disabled if required by specifying
the -B option when starting the daemon. This is usually performed by an entry in
/etc/inittab.
6.10.2 Thread-Safe Routines in libsrc
In previous versions of AIX, some of the libsrc subroutines are neither threadsafe
nor reentrant. This prevents other libraries and applications that call these libsrc
subroutines from achieving thread-safety and reentrance requirements.
The libsrc subroutines of interest in a threaded environment are those that
support communication with an SRC subsystem. In other words, the routines that
are used by an application, that may be multi-threaded, to interrogate the SRC.
The libsrc subroutines that update the subsystem configuration data, and those
that are used by SRC commands to process input parameters, are not required in
a threaded environment. This is because the applications that use these routines,
the srcmstr daemon itself along with lssrc and related commands, are not
threaded applications.
The threadsafe and reentrant routines are shown in Table 23. The new function
has been implemented by changing the internals of some routines and by
providing new threadsafe and reentrant versions of other routines. The new
routines are indicated by the _r extension on the name. Where a new routine has
been implemented, the original non-threadsafe version has been retained for use
by non-threaded applications and for binary compatibility with previous versions
of AIX.
Table 23. Threadsafe Routines in libsrc
New threadsafe routines
src_err_msg_r
srcrrqs_r
srcstattxt_r
srcstat_r
Existing routines made threadsafe
srcsrpy
srcstathdr
srcstop
srcstrt
srcsrqt_r
srcsbuf_r
System Management and Utilities 133