| author | Alex Van Brunt <avanbrunt@nvidia.com> | |
| Fri, 26 Sep 2014 20:32:47 +0000 (13:32 -0700) | ||
| committer | Elliott Hughes <enh@google.com> | |
| Sat, 4 Oct 2014 01:54:28 +0000 (18:54 -0700) | ||
| commit | 8d0b2dbf2154d5da17ff09b1d4f864d281362ad2 | |
| tree | f17c338cdad0320f0205f8d097d316c0ad2a1894 | tree | snapshot (tar.xz tar.gz zip) |
| parent | d5df4124bbbb30411ef19f7c2fbb3987d0eb9630 | commit | diff |
Reimplement clock(3) using clock_gettime(3)
Unlike times(), clock_gettime() is implemented as a vDSO on many architectures.
So, using clock_gettime() will return a more accurate time and do so with less
overhead because it does have the overhead of calling into the kernel.
It is also significantly more accurate because it measures the actual time in
nanoseconds rather than the number of ticks (typically 1 millisecond or more).
Bug: 17814435
Change-Id: Id4945d9f387330518f78669809639952e9227ed9
Unlike times(), clock_gettime() is implemented as a vDSO on many architectures.
So, using clock_gettime() will return a more accurate time and do so with less
overhead because it does have the overhead of calling into the kernel.
It is also significantly more accurate because it measures the actual time in
nanoseconds rather than the number of ticks (typically 1 millisecond or more).
Bug: 17814435
Change-Id: Id4945d9f387330518f78669809639952e9227ed9
| libc/bionic/clock.cpp | diff | blob | history | |
| tests/time_test.cpp | diff | blob | history |