From ced340d739e84737dd5c8e6b4ab9af2ea44e29e7 Mon Sep 17 00:00:00 2001
From: Mikhail Zakharov <mikhail.zakharov@cognitivesystems.com>
Date: Tue, 23 Apr 2019 11:06:11 -0400
Subject: [PATCH] unix/unix_mphal: Use CLOCK_MONOTONIC for ticks_ms/us when
 available.

---
 ports/unix/unix_mphal.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/ports/unix/unix_mphal.c b/ports/unix/unix_mphal.c
index f27c62fd1..71edaa57a 100644
--- a/ports/unix/unix_mphal.c
+++ b/ports/unix/unix_mphal.c
@@ -187,13 +187,25 @@ void mp_hal_stdout_tx_str(const char *str) {
 }
 
 mp_uint_t mp_hal_ticks_ms(void) {
+    #if (defined(_POSIX_TIMERS) && _POSIX_TIMERS > 0) && defined(_POSIX_MONOTONIC_CLOCK)
+    struct timespec tv;
+    clock_gettime(CLOCK_MONOTONIC, &tv);
+    return tv.tv_sec * 1000 + tv.tv_nsec / 1000000;
+    #else
     struct timeval tv;
     gettimeofday(&tv, NULL);
     return tv.tv_sec * 1000 + tv.tv_usec / 1000;
+    #endif
 }
 
 mp_uint_t mp_hal_ticks_us(void) {
+    #if (defined(_POSIX_TIMERS) && _POSIX_TIMERS > 0) && defined(_POSIX_MONOTONIC_CLOCK)
+    struct timespec tv;
+    clock_gettime(CLOCK_MONOTONIC, &tv);
+    return tv.tv_sec * 1000000 + tv.tv_nsec / 1000;
+    #else
     struct timeval tv;
     gettimeofday(&tv, NULL);
     return tv.tv_sec * 1000000 + tv.tv_usec;
+    #endif
 }