Add monotime() wrapper for CLOCK_MONOTONIC

2 files changed, 17 insertions, 0 deletions

diff --git a/include/litmus.h b/include/litmus.h
index 72f1ad4..2c5d4df 100644
--- a/include/litmus.h
+++ b/include/litmus.h
@@ -330,6 +330,12 @@ double cputime(void);
  */
 double wctime(void);
 
+/**
+ * Obtain CLOCK_MONOTONIC time
+ * @return CLOCK_MONOTONIC time in seconds
+ */
+double monotime(void);
+
 /***** semaphore allocation ******/
 /**
  * Allocate a semaphore following the FMLP protocol
diff --git a/src/clocks.c b/src/clocks.c
index 74c2fb4..5af4c1f 100644
--- a/src/clocks.c
+++ b/src/clocks.c
@@ -24,6 +24,17 @@ double wctime(void)
         return (tv.tv_sec + 1E-6 * tv.tv_usec);
 }
 
+/* current time, according to CLOCK_MONOTONIC */
+double monotime(void)
+{
+        struct timespec ts;
+        int err;
+        err = clock_gettime(CLOCK_MONOTONIC, &ts);
+        if (err != 0)
+                perror("clock_gettime");
+        return (ts.tv_sec + 1E-9 * ts.tv_nsec);
+}
+
 int lt_sleep(lt_t timeout)
 {
         struct timespec delay;