Efficient logging of time measurements


 
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Old 03-10-2013
Instead of pipes -- if you're worried about resources or blocking, simply use a single thread that reads a message queue. Once a message queue (SYSV or POSIX) is set up there is a single syscall ( e.g., msgsnd, no blocking ) that is mt-safe and a mutex is not required.

The buffersize, unlike, a pipe, can be any size. The message queue buffer is kernel persistent, so if the entire set of threads/processes using the message queue die, the data is still available. Pipes are closed on process termination.
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POSTLOG(1)						      General Commands Manual							POSTLOG(1)

NAME
postlog - Postfix-compatible logging utility SYNOPSIS
postlog [-iv] [-c config_dir] [-p priority] [-t tag] [text...] DESCRIPTION
The postlog command implements a Postfix-compatible logging interface for use in, for example, shell scripts. By default, postlog logs the text given on the command line as one record. If no text is specified on the command line, postlog reads from standard input and logs each input line as one record. Logging is sent to syslogd(8); when the standard error stream is connected to a terminal, logging is sent there as well. The following options are implemented: -c config_dir Read the main.cf configuration file in the named directory instead of the default configuration directory. -i Include the process ID in the logging tag. -p priority Specifies the logging severity: info (default), warn, error, fatal, or panic. -t tag Specifies the logging tag, that is, the identifying name that appears at the beginning of each logging record. -v Enable verbose logging for debugging purposes. Multiple -v options make the software increasingly verbose. SEE ALSO
syslogd(8) syslog daemon. LICENSE
The Secure Mailer license must be distributed with this software. AUTHOR(S) Wietse Venema IBM T.J. Watson Research P.O. Box 704 Yorktown Heights, NY 10598, USA POSTLOG(1)