Performance/bin/Stopwatch.c

0001 #include <stdlib.h>
0002 #include "Stopwatch.h"
0003
0004 double seconds() { return ((double)clock()) / (double)CLOCKS_PER_SEC; }
0005
0006 void Stopwtach_reset(Stopwatch Q) {
0007   Q->running = 0; /* false */
0008   Q->last_time = 0.0;
0009   Q->total = 0.0;
0010 }
0011
0012 Stopwatch new_Stopwatch(void) {
0013   Stopwatch S = (Stopwatch)malloc(sizeof(Stopwatch_struct));
0014   if (S == NULL)
0015     return NULL;
0016
0017   Stopwtach_reset(S);
0018   return S;
0019 }
0020
0021 void Stopwatch_delete(Stopwatch S) {
0022   if (S != NULL)
0023     free(S);
0024 }
0025
0026 /* Start resets the timer to 0.0; use resume for continued total */
0027
0028 void Stopwatch_start(Stopwatch Q) {
0029   if (!(Q->running)) {
0030     Q->running = 1; /* true */
0031     Q->total = 0.0;
0032     Q->last_time = seconds();
0033   }
0034 }
0035
0036 /**
0037     Resume timing, after stopping.  (Does not wipe out
0038         accumulated times.)
0039
0040 */
0041
0042 void Stopwatch_resume(Stopwatch Q) {
0043   if (!(Q->running)) {
0044     Q->last_time = seconds();
0045     Q->running = 1; /*true*/
0046   }
0047 }
0048
0049 void Stopwatch_stop(Stopwatch Q) {
0050   if (Q->running) {
0051     Q->total += seconds() - Q->last_time;
0052     Q->running = 0; /* false */
0053   }
0054 }
0055
0056 double Stopwatch_read(Stopwatch Q) {
0057   if (Q->running) {
0058     double t = seconds();
0059     Q->total += t - Q->last_time;
0060     Q->last_time = t;
0061   }
0062   return Q->total;
0063 }