Content-type: text/html Man page of mktimer

mktimer

Section: C Library Functions (3)
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NAME

mktimer - Allocates a per-process timer  

LIBRARY

Standard C Library (libc.a)  

SYNOPSIS

#include <sys/timers.h>

timer_t mktimer(        int clock_type,
       int notify_type,
       void *reserved) ;
 

PARAMETERS

Specifies the system-wide clock to be used as a per-process time base for the new timer. Specifies the mechanism by which a process is to be notified when the per-process timer times out. Not used.  

DESCRIPTION

The mktimer() function is used to allocate a per-process timer using a specified system-wide clock as its timebase. The mktimer() function returns a unique timer ID of type timer_t, which is used to identify the timer in per-process timer requests.

Each implementation of per-process timers defines a set of clocks that can be used as a time base for per-process timers, and one or more mechanisms for notifying the process that a per-process timer has expired. The Tru64 UNIX operating system allows each process to allocate one per-process timer whose clock_type parameter is specified by the TIMEOFDAY symbolic constant, which is defined in the timers.h include file, using the notification mechanism whose notify_type parameter is specified by the DELIVERY_SIGNALS symbolic constant.

When the notify_type parameter is specified as DELIVERY_SIGNALS, the system sends a SIGALRM signal to the process whenever the timer expires.

 

NOTES

Per-process timers are not inherited by a child process across fork() or exec() functions.

The reserved parameter is not currently used, but is specified for future support of other delivery mechanisms.

The mktimer() function is part of the POSIX 1003.4 real time extensions, which is not an approved standard. As such, it is liable to change. Trial use  

RETURN VALUES

Upon successful completion, the mktimer() function returns a timer_t value, which may be passed to a per-process timer call. Otherwise, mktimer() returns a value of (timer_t)-1 and sets errno to indicate the error.  

ERRORS

If the mktimer() function fails, errno may be set to one of the following values: The calling process has already allocated all available timers. The clock_type or notify_type parameter is invalid.  

RELATED INFORMATION

Functions: exec(2), fork(2), getclock(3), gettimer(3), reltimer(3), rmtimer(3), setclock(3) delim off


 

Index

NAME
LIBRARY
SYNOPSIS
PARAMETERS
DESCRIPTION
NOTES
RETURN VALUES
ERRORS
RELATED INFORMATION

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Time: 02:42:14 GMT, October 02, 2010