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| author | Konstantin Belousov <kib@FreeBSD.org> | 2012-06-22 07:13:30 +0000 |
|---|---|---|
| committer | Konstantin Belousov <kib@FreeBSD.org> | 2012-06-22 07:13:30 +0000 |
| commit | 869fd80fd449c2e3f8d7caa7ff4af71e904b5f08 (patch) | |
| tree | 58a73d4c3dd528ab72afbea3d6243d4dd6c48c3e /lib/libc/include/libc_private.h | |
| parent | aea810386d8eb0602013a36a5d41822758972af6 (diff) | |
| download | src-869fd80fd449c2e3f8d7caa7ff4af71e904b5f08.tar.gz src-869fd80fd449c2e3f8d7caa7ff4af71e904b5f08.zip | |
Use struct vdso_timehands data to implement fast gettimeofday(2) and
clock_gettime(2) functions if supported. The speedup seen in
microbenchmarks is in range 4x-7x depending on the hardware.
Only amd64 and i386 architectures are supported. Libc uses rdtsc and
kernel data to calculate current time, if enabled by kernel.
Hopefully, this code is going to migrate into vdso in some future.
Discussed with: bde
Reviewed by: jhb
Tested by: flo
MFC after: 1 month
Notes
Notes:
svn path=/head/; revision=237434
Diffstat (limited to 'lib/libc/include/libc_private.h')
| -rw-r--r-- | lib/libc/include/libc_private.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/lib/libc/include/libc_private.h b/lib/libc/include/libc_private.h index 2182f4689719..faae02811d17 100644 --- a/lib/libc/include/libc_private.h +++ b/lib/libc/include/libc_private.h @@ -34,6 +34,7 @@ #ifndef _LIBC_PRIVATE_H_ #define _LIBC_PRIVATE_H_ +#include <sys/_types.h> #include <sys/_pthreadtypes.h> /* @@ -245,6 +246,12 @@ extern void * __sys_freebsd6_mmap(void *, __size_t, int, int, int, int, __off_t) /* Without back-compat translation */ extern int __sys_fcntl(int, int, ...); +struct timespec; +struct timeval; +struct timezone; +int __sys_gettimeofday(struct timeval *, struct timezone *); +int __sys_clock_gettime(__clockid_t, struct timespec *ts); + /* execve() with PATH processing to implement posix_spawnp() */ int _execvpe(const char *, char * const *, char * const *); |