delay()

Suspends a calling thread for a given length of time

Synopsis:

#include <unistd.h>

unsigned int delay( unsigned int duration );

Arguments:

duration: The number of milliseconds for which to suspend the calling thread from execution.

Library:

libc

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

Description:

The delay() function suspends the calling thread for duration milliseconds.

The suspension time may be greater than the requested amount, due to the nature of time measurement (see the Tick, Tock: Understanding the Neutrino Microkernel's Concept of Time chapter of the QNX Neutrino Programmer's Guide), or due to the scheduling of other, higher-priority threads by the system.

Returns:

0 for success, or the number of unslept milliseconds if interrupted by a signal.

Errors:

If an error occurs, errno is set to:

EAGAIN: No timer resources were available to satisfy the request.

Examples:

#include <unistd.h>
#include <stdlib.h>

void play_sound( void )
{
    …
}

void stop_sound( void )
{
    …
}

int main( void )
{
    play_sound();
    delay( 500 );  /* delay for 1/2 second */
    stop_sound();

    return EXIT_SUCCESS;
}

Classification:

QNX 4

Safety:
Cancellation point	Yes
Interrupt handler	No
Signal handler	Yes
Thread	Yes