From 13a9f42818f6b89a72b3e40923be809b490400d8 Mon Sep 17 00:00:00 2001 From: kib Date: Fri, 22 Jun 2012 07:13:30 +0000 Subject: 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 --- lib/libc/include/libc_private.h | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'lib/libc/include') diff --git a/lib/libc/include/libc_private.h b/lib/libc/include/libc_private.h index 2182f46..faae028 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 #include /* @@ -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 *); -- cgit v1.1