Set the expiration time for a timer
#include <sys/neutrino.h> int TimerSettime( timer_t id, int flags, const struct _itimer *itime, struct _itimer *oitime ); int TimerSettime_r( timer_t id, int flags, const struct _itimer *itime, struct _itimer *oitime );
If the flag isn't specified, nsec represents a “relative” expiration period that's offset from the given clock's current system time in nanoseconds.
Use the -l c option to qcc to link against this library. This library is usually included automatically.
The TimerSettime() and TimerSettime_r() kernel calls set the expiration time of the timer specified by id.
These functions are identical except in the way they indicate errors. See the Returns section for details.
The expiration is specified by the itime argument. The _itimer structure contains at least the following members:
If the nsec member of itime is zero, then the timer is disarmed.
If the interval_nsec member of itime is nonzero, then it specifies a repeat rate which is added to the timer once the nsec period has expired. Subsequently, the timer is automatically rearmed, causing it to become repetitive with a period of interval_nsec.
If the timer is already armed when you call TimerSettime(), this call discards the previous setting and sets a new setting.
If the event notification specified by TimerCreate() has a sigev_code of SI_TIMER, then at most one event is queued. In this case, if an event is pending from a previous timer when the timer fires again, a timer overrun occurs. You can use the TimerInfo() kernel call to obtain the number of overruns that have occurred on this timer.
|Because of the nature of time measurement, the timer might actually expire after the specified time. For more information, see the Tick, Tock: Understanding the Neutrino Microkernel's Concept of Time chapter of the QNX Neutrino Programmer's Guide.|
This call doesn't block.
The only difference between these functions is the way they indicate errors:
timer_gettime(), timer_settime(), TimerCreate(), TimerInfo()
Clocks, Timers, and Getting a Kick Every So Often chapter of Getting Started with QNX Neutrino
Tick, Tock: Understanding the Neutrino Microkernel's Concept of Time chapter of the QNX Neutrino Programmer's Guide