nanosleep()

Suspend a thread until a timeout or signal occurs

Synopsis:

#include <time.h>

int nanosleep( const struct timespec* rqtp,
               struct timespec* rmtp );

Arguments:

rqtp

A pointer to a timespec structure that specifies the time interval for which you want to suspend the thread.

rmtp

NULL, or a pointer to a timespec structure where the function can store the amount of time remaining in the interval (the requested time minus the time actually slept).

Library:

libc

Use the -l c option to qcc to link against this library. This library is usually included automatically.

Description:

The nanosleep() function causes the calling thread to be suspended from execution until either:

• The time interval specified by the rqtp argument has elapsed

  Or

• A signal is delivered to the thread, and the signal's action is to invoke a signal-catching function or terminate the process.

---

The suspension time may be longer than requested because the argument value is rounded up to be a multiple of the system timer resolution (see the Tick, Tock: Understanding the Neutrino Microkernel's Concept of Time chapter of the QNX Neutrino Programmer's Guide) or because of scheduling and other system activity.

---

Returns:

0

The requested time has elapsed.

-1

The nanosleep() function was interrupted by a signal (errno is set).

Errors:

EAGAIN

All timers are in use. You'll have to wait for a process to release one.

EFAULT

A fault occurred trying to access the buffers provided.

EINTR

The nanosleep() function was interrupted by a signal.

EINVAL

The number of nanoseconds specified by the tv_nsec member of the timespec structure pointed to by rqtp is less than zero or greater than or equal to 1000 million.

Classification:

POSIX 1003.1 TMR

See also:

delay, errno, clock_getres(), clock_gettime(), clock_settime(), sleep(), timer_create(), timer_delete(), timer_gettime(), timer_settime(), timespec, usleep()