[PATCH-RFC] adding pids to logging

Hi list,

we'd like to add the pid (process id) logging into the standard Kannel
output log format. This may be used for further thread and process
debugging. This would imply the change of the log-file format

from

  <timestamp> [<thread id>] <log-level> <log message>

to
  <timestamp> [<process id>] [<thread-id>] <log-level> <log message>

so we _add_ the pid as second argument of the log format.

We use getpid() in gwlib/gwthread-pthread.c:new_thread() to get the
thread process id of the OS and safe it to the threadinfo structure.
While formating the log line, we call a function which is similar to
gwthread_self() and returns two values, the tid and pid, writing those
to the log line. So there is no performance decrease in doing this.

Any objections to modify the standard log-file format into this?

NOTE: this may imply of source that people who do analyze the logs
would have to change parser routines or regex expressions accordingly.

Stipe

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