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-rw-r--r--include/mach/time_value.h31
1 files changed, 24 insertions, 7 deletions
diff --git a/include/mach/time_value.h b/include/mach/time_value.h
index 2a2f091..61be581 100644
--- a/include/mach/time_value.h
+++ b/include/mach/time_value.h
@@ -45,23 +45,40 @@ typedef struct time_value time_value_t;
*/
#define TIME_MICROS_MAX (1000000)
+#define time_value_assert(val) \
+ assert(0 <= (val)->microseconds && (val)->microseconds < TIME_MICROS_MAX);
+
#define time_value_add_usec(val, micros) { \
+ time_value_assert(val); \
if (((val)->microseconds += (micros)) \
>= TIME_MICROS_MAX) { \
(val)->microseconds -= TIME_MICROS_MAX; \
(val)->seconds++; \
} \
+ time_value_assert(val); \
}
-#define time_value_add(result, addend) { \
- (result)->microseconds += (addend)->microseconds; \
- (result)->seconds += (addend)->seconds; \
- if ((result)->microseconds >= TIME_MICROS_MAX) { \
- (result)->microseconds -= TIME_MICROS_MAX; \
- (result)->seconds++; \
- } \
+#define time_value_sub_usec(val, micros) { \
+ time_value_assert(val); \
+ if (((val)->microseconds -= (micros)) < 0) { \
+ (val)->microseconds += TIME_MICROS_MAX; \
+ (val)->seconds--; \
+ } \
+ time_value_assert(val); \
}
+#define time_value_add(result, addend) { \
+ time_value_assert(addend); \
+ (result)->seconds += (addend)->seconds; \
+ time_value_add_usec(result, (addend)->microseconds); \
+ }
+
+#define time_value_sub(result, subtrahend) { \
+ time_value_assert(subtrahend); \
+ (result)->seconds -= (subtrahend)->seconds; \
+ time_value_sub_usec(result, (subtrahend)->microseconds); \
+ }
+
/*
* Time value available through the mapped-time interface.
* Read this mapped value with