1 files changed, 50 insertions, 0 deletions
diff --git a/src/libstddjb/tain_stopwatch.c b/src/libstddjb/tain_stopwatch.c
new file mode 100644
index 0000000..2bb4974
--- /dev/null
+++ b/src/libstddjb/tain_stopwatch.c
@@ -0,0 +1,50 @@
+/* ISC license. */
+
+#include <skalibs/sysdeps.h>
+#include <skalibs/tai.h>
+
+#if defined(SKALIBS_HASCLOCKRT) && (defined(SKALIBS_HASCLOCKMON) || defined(SKALIBS_HASCLOCKBOOT))
+
+#include <time.h>
+
+int tain_stopwatch_init (clock_t cl, tain_t *offset)
+{
+  tain_t a, b ;
+  struct timespec ts ;
+  if (!tain_wallclock_read(&a)) return 0 ;
+  if (clock_gettime(cl, &ts) < 0) return 0 ;
+  if (!tain_from_timespec(&b, &ts)) return 0 ;
+  tain_add(&a, &a, &tain_nano500) ;
+  tain_sub(offset, &a, &b) ;
+  return 1 ;
+}
+
+int tain_stopwatch_read (tain_t *a, clock_t cl, tain_t const *offset)
+{
+  struct timespec ts ;
+  if (clock_gettime(cl, &ts) < 0) return 0 ;
+  if (!tain_from_timespec(a, &ts)) return 0 ;
+  tain_add(a, a, offset) ;
+  return 1 ;
+}
+
+#else
+
+#include <errno.h>
+
+int tain_stopwatch_init (clock_t cl, tain_t *offset)
+{
+  (void)cl ;
+  (void)offset ;
+  return (errno = ENOSYS, 0) ;
+}
+
+int tain_stopwatch_read (tain_t *a, clock_t cl, tain_t const *offset)
+{
+  (void)a ;
+  (void)cl ;
+  (void)offset ;
+  return (errno = ENOSYS, 0) ;
+}
+
+#endif