get the resolution of the clock
#include <time.h> int clock_getres( clockid_t clock_id, struct timespec *res );
The clock_getres() function gets the resolution of the clock specified by clock_id and puts it into the buffer pointed to by res. The only supported clock ID is CLOCK_REALTIME.
The res parameter points to a structure containing at least the following members:
/* * This program prints out the clock resolution. */ #include <stdio.h> #include <stdlib.h> #include <time.h> int main( void ) { struct timespec res; if ( clock_getres( CLOCK_REALTIME, &res) == -1 ) { perror( "clock get resolution" ); exit( EXIT_FAILURE ); } printf( "Resolution is %ld micro seconds.\n", res.tv_nsec / 1000 ); return( EXIT_SUCCESS ); }
POSIX 1003.4
Safety: | |
---|---|
Interrupt handler | No |
Signal handler | Yes, but modifies errno |
Thread | Yes |
clock_gettime(), clock_setres(), clock_settime(), errno, qnx_getclock(), qnx_setclock(), ticksize utility