msach@0: /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
msach@0: /*   File:         wtime.c                                                   */
msach@0: /*   Description:  a timer that reports the current wall time                */
msach@0: /*                                                                           */
msach@0: /*   Author:  Wei-keng Liao                                                  */
msach@0: /*            ECE Department Northwestern University                         */
msach@0: /*            email: wkliao@ece.northwestern.edu                             */
msach@0: /*   Copyright, 2005, Wei-keng Liao                                          */
msach@0: /*                                                                           */
msach@0: /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
msach@0: 
msach@0: #include <sys/time.h>
msach@0: #include <stdio.h>
msach@0: #include <stdlib.h>
msach@0: 
msach@0: /*
msach@0: *	Function: wtime
msach@0: *	---------------
msach@0: *	Provides a millisecond-resolution timer for measurement purposes.
msach@0: */
msach@0: double wtime(void) 
msach@0: {
msach@0:     double          now_time;
msach@0:     struct timeval  etstart;
msach@0:     struct timezone tzp;
msach@0: 
msach@0:     if (gettimeofday(&etstart, &tzp) == -1) {
msach@0: 		fprintf(stderr, "Timing Error: Could Not Get Current Time\n");
msach@0: 		exit(EXIT_FAILURE);
msach@0: 	}
msach@0: 
msach@0:     now_time = ((double)etstart.tv_sec) +              /* in seconds */
msach@0:                ((double)etstart.tv_usec) / 1000000.0;  /* in microseconds */
msach@0:     return now_time;
msach@0: }
msach@0: 
msach@0: