From 0f0358f2856e594fbbd0d3eed9725d1017cd120f Mon Sep 17 00:00:00 2001
From: Vincent Sanders <vince@kyllikki.org>
Date: Thu, 27 Nov 2014 08:46:56 +0000
Subject: add fallback for RISC OS monotonic timer

---
 src/time.c | 32 ++++++++++++++++++++++++++------
 1 file changed, 26 insertions(+), 6 deletions(-)

diff --git a/src/time.c b/src/time.c
index 582bc9d..1753ad4 100644
--- a/src/time.c
+++ b/src/time.c
@@ -15,26 +15,46 @@
 #include <stdint.h>
 #include <stdlib.h>
 #include <unistd.h>
-#include <sys/time.h>
-#include <time.h>
 
 #include "nsutils/time.h"
 
 /* exported interface documented in nsutils/time.h */
-nsuerror nsu_getmonotonic_ms(uint64_t *current)
+nsuerror nsu_getmonotonic_ms(uint64_t *current_out)
 {
-#if (_POSIX_TIMERS > 0) && (defined _POSIX_MONOTONIC_CLOCK)
+    uint64_t current;
+    static uint64_t prev = 0; /* previous time so we never go backwards */
+
+#if defined(_POSIX_TIMERS) && (_POSIX_TIMERS > 0) && (defined _POSIX_MONOTONIC_CLOCK)
+#include <time.h>
     struct timespec tp;
+
     clock_gettime(CLOCK_MONOTONIC, &tp);
-    *current = (tp.tv_sec * 1000) + (tp.tv_nsec / 1000000);
+    current = (tp.tv_sec * 1000) + (tp.tv_nsec / 1000000);
+#elif defined(riscos)
+#include "oslib/os.h"
+    os_t time;
+
+    time = os_read_monotonic_time();
+    current = time * 10;
 #else
 #warning "Using dodgy gettimeofday() fallback"
+#include <sys/time.h>
     /** \todo Implement this properly! */
     struct timeval tv;
 
     gettimeofday(&tv, NULL);
 
-    *current = (tv.tv_sec * 1000) + (tv.tv_usec / 1000);
+    current = (tv.tv_sec * 1000) + (tv.tv_usec / 1000);
 #endif
+
+    /* ensure time never goes backwards */
+    if (current > prev) {
+        *current_out = current;
+        prev = current;
+    } else {
+        /** \todo is 10ms really correct or can we calculate a delta going forwards? */
+        prev += 10;
+        *current_out = prev;
+    }
     return NSUERROR_OK;
 }
-- 
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