fix: clock_gettime instead of clock

src/tempo.c

@@ -7,7 +7,13 @@
 #include "config.h"
 #include "tempo.h"
 
-static long now_ms() { return 1000 * clock() / CLOCKS_PER_SEC; }
+static long now_ms() {
+  struct timespec ts;
+  if (clock_gettime(CLOCK_REALTIME, &ts) != 0) {
+    return 0;
+  }
+  return 1000 * ts.tv_sec + ts.tv_nsec / 1e6;
+}
 
 static void reset_tap_chain(Tempo *tempo, long t) {
   tempo->last_reset = t;

src/timer.c

@@ -1,3 +1,4 @@
+#include <bits/time.h>
 #include <limits.h>
 #include <time.h>
 
@@ -8,7 +9,7 @@
 void timer_init(Timer *timer, const unsigned int target) {
   timer->counter = 0;
   timer->target = target;
-  timer->start = clock();
+  clock_gettime(CLOCK_REALTIME, &timer->start);
 }
 
 bool timer_inc(Timer *timer) {
@@ -17,13 +18,16 @@ bool timer_inc(Timer *timer) {
 }
 
 double timer_reset(Timer *timer) {
-  clock_t stop;
+  struct timespec stop;
   double secs;
   double per_secs;
 
-  stop = clock();
+  if (clock_gettime(CLOCK_REALTIME, &stop) != 0) {
+    return 0.0;
+  }
 
-  secs = (double)(stop - timer->start) / CLOCKS_PER_SEC;
+  secs = (double)(stop.tv_sec - timer->start.tv_sec) +
+         (double)(stop.tv_nsec - timer->start.tv_nsec) / 1e9;
   per_secs = (double)timer->counter / secs;
 
   timer->start = stop;

src/types.h

@@ -280,7 +280,7 @@ typedef struct StateBackgroundWriteArgs {
 // timer.c
 
 typedef struct Timer {
-  clock_t start;
+  struct timespec start;
   unsigned int counter;
   unsigned int target;
 } Timer;