delay()
QNX SDP8.0C Library ReferenceAPIDeveloper
Suspend 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.
Note:
The suspension time may be greater than the requested amount, due to
the nature of time measurement (see the
Understanding the Microkernel's Concept of Timechapter of the QNX OS 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.
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:
| Safety: | |
|---|---|
| Cancellation point | Yes |
| Signal handler | Yes |
| Thread | Yes |
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