diff options
| -rw-r--r-- | include/mach/time_value.h | 31 |
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 |