diff options
Diffstat (limited to 'src/lib/time/compat_time.h')
| -rw-r--r-- | src/lib/time/compat_time.h | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/src/lib/time/compat_time.h b/src/lib/time/compat_time.h index da96023894..eaf676ae84 100644 --- a/src/lib/time/compat_time.h +++ b/src/lib/time/compat_time.h @@ -89,6 +89,13 @@ * A: In general, regular monotime uses something that requires a system call. * On platforms where system calls are cheap, you win! Otherwise, you lose. * + * XXX: This hasn't been true for a long time. Expect both coarse and fine + * monotime won't require a syscall, but they will have different + * costs in terms of low-level synchronization inside the vDSO and + * the hardware. The basic guidelines here still apply, but we aren't + * really worrying about system calls any more, and the integer div + * concerns are becoming nearly unimportant as well. + * * On Windows, monotonic time uses QuereyPerformanceCounter. Storing * monotime_t costs 8 bytes. * @@ -232,7 +239,12 @@ MOCK_DECL(uint64_t, monotime_absolute_usec,(void)); * Fractional units are truncated, not rounded. */ uint64_t monotime_absolute_msec(void); - +/** + * Return the number of seconds since the timer system was initialized. + * The returned value may be equal to zero. + * Fractional units are truncated, not rounded. + */ +uint64_t monotime_absolute_sec(void); /** * Set <b>out</b> to zero. */ @@ -259,11 +271,13 @@ void monotime_coarse_get(monotime_coarse_t *out); uint64_t monotime_coarse_absolute_nsec(void); uint64_t monotime_coarse_absolute_usec(void); uint64_t monotime_coarse_absolute_msec(void); +uint64_t monotime_coarse_absolute_sec(void); #else /* !defined(MONOTIME_COARSE_FN_IS_DIFFERENT) */ #define monotime_coarse_get monotime_get #define monotime_coarse_absolute_nsec monotime_absolute_nsec #define monotime_coarse_absolute_usec monotime_absolute_usec #define monotime_coarse_absolute_msec monotime_absolute_msec +#define monotime_coarse_absolute_sec monotime_absolute_sec #endif /* defined(MONOTIME_COARSE_FN_IS_DIFFERENT) */ /** |