fix: use clock instead of timeofday

configure.ac

@@ -11,7 +11,6 @@ AC_CHECK_HEADERS([stdlib.h])
 AC_CHECK_HEADERS([sys/ioctl.h])
 AC_CHECK_HEADERS([sys/mman.h])
 AC_CHECK_HEADERS([sys/stat.h])
-AC_CHECK_HEADERS([sys/time.h])
 AC_CHECK_HEADERS([sys/types.h])
 AC_CHECK_HEADERS([sys/wait.h])
 

src/tempo.c

@@ -1,19 +1,13 @@
 #include <math.h>
 #include <string.h>
-#include <sys/time.h>
+#include <time.h>
 
 #include "types.h"
 
 #include "config.h"
 #include "tempo.h"
 
-static long now() {
-  struct timeval now;
-
-  gettimeofday(&now, NULL);
-
-  return now.tv_sec * 1000 + now.tv_usec / 1000;
-}
+static long now_ms() { return 1000 * clock() / CLOCKS_PER_SEC; }
 
 static void reset_tap_chain(Tempo *tempo, long t) {
   tempo->last_reset = t;
@@ -93,7 +87,7 @@ static void add_tap_to_chain(Tempo *tempo, long t) {
 void tempo_init(Tempo *tempo, float value) {
   long t;
 
-  t = now();
+  t = now_ms();
 
   reset_tap_chain(tempo, t);
 
@@ -105,7 +99,7 @@ void tempo_set(Tempo *tempo, float value) {
   long t;
   long progress;
 
-  t = now();
+  t = now_ms();
 
   progress = (t - tempo->last_reset) % tempo->beat_length;
 
@@ -118,7 +112,7 @@ void tempo_set(Tempo *tempo, float value) {
 void tempo_tap(Tempo *tempo) {
   long t;
 
-  t = now();
+  t = now_ms();
 
   if (!is_chain_active(*tempo, t)) {
     reset_tap_chain(tempo, t);
@@ -130,7 +124,7 @@ void tempo_tap(Tempo *tempo) {
 double tempo_total(const Tempo *tempo) {
   long t;
 
-  t = now();
+  t = now_ms();
 
   return (double)(t - tempo->last_reset) / (double)tempo->beat_length;
 }

src/timer.c

@@ -1,4 +1,4 @@
-#include <sys/time.h>
+#include <time.h>
 
 #include "types.h"
 
@@ -7,8 +7,7 @@
 void timer_init(Timer *timer, const unsigned int target) {
   timer->counter = 0;
   timer->target = target;
-
-  gettimeofday(&timer->start, NULL);
+  timer->start = clock();
 }
 
 bool timer_inc(Timer *timer) {
@@ -17,14 +16,13 @@ bool timer_inc(Timer *timer) {
 }
 
 double timer_reset(Timer *timer) {
-  struct timeval stop;
+  clock_t stop;
   double secs;
   double per_secs;
 
-  gettimeofday(&stop, NULL);
+  stop = clock();
 
-  secs = (double)(stop.tv_usec - timer->start.tv_usec) / 1000000 +
-         (double)(stop.tv_sec - timer->start.tv_sec);
+  secs = (double)(stop - timer->start) / CLOCKS_PER_SEC;
   per_secs = (double)timer->counter / secs;
 
   timer->start = stop;

src/types.h

@@ -279,7 +279,7 @@ typedef struct StateBackgroundWriteArgs {
 // timer.c
 
 typedef struct Timer {
-  struct timeval start;
+  clock_t start;
   unsigned int counter;
   unsigned int target;
 } Timer;