Avaya Media Processing Server Series System (Software Release 2.1) Manual de usuario descargar pdf (Pagina 72)

Avaya Media Processing Server Series System Reference Manual

Page 72 # P0602477 Ver: 3.1.11

Restart of Abnormally Terminated Programs

SRP can restart programs that have either terminated abnormally or exhibited faulty

operation. Abnormal termination is detected on Solaris systems via the SIGCHLD

signal, or by proxy messages from remote copies of SRP that received a SIGCHLD

signal. On Windows, a separate thread is started for each child process that SRP starts.

This thread blocks on monitoring the process handle of the child process; when that

handle becomes signalled by the kernel that the child process has terminated, the

thread initiates the same child-termination processing that is instituted by SRP under

the Solaris SIGCHLD signal handler. In either case, SRP restarts the process.

If the problem process were in the VOS software process group, a synchronization

phase is entered. That is, all other processes in the VOS process group are notified

that a process has terminated and should reset as if they were being started for the first

time. SRP restarts the process that exited and all processes in the VOS software

process group are allowed to begin operation.

Faulty operation is detected by means of the ping messages that SRP sends to

processes in the VOS group. If successive ping messages fail to generate replies, SRP

considers the process to be in an abnormal state and kills it. At that point, the system

behaves as if the process exited abnormally.

Communication with VOS Processes

For Solaris-based systems, multicast pinging is available as a subsystem within the

IPC library. The implementation of multicast pinging is similar to that of unicast

IPC-connection pinging, except that a ping transmission interval may be specified.

All pinging configuration is done for SRP. VOS processes that receive pings cannot

be configured for these actions. (This is handled within callbacks defined by the IPC

library.)

For Windows systems, only unicast pinging is available.

In Solaris systems unicast or multicast pinging can be performed by any process

whenever it is necessary to ping remote connections. The unicast method should be

used when pinging a single remote connection, or a small number of remote

connections. Multicast pinging should be employed if there is a need to ping many

remote connections.

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Avaya Media Processing Server Series System (Software Release 2.1) Manual de usuario Pagina 72