mirror/glibc
2
0
Fork 0
mirror of git://sourceware.org/git/glibc.git synced 2025-03-25 13:51:04 +08:00
Code Issues Packages Projects Releases Wiki Activity

Avoid gettimeofday vsyscall

Browse Source
This commit is contained in:
Ulrich Drepper 2011-09-06 20:22:37 -04:00
parent 42a36f6670
commit d53a73acdb
2 changed files with 8 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
ChangeLog
View File

@ -1,3 +1,8 @@
2011-09-06 Ulrich Drepper <drepper@gmail.com>
* sysdeps/unix/sysv/linux/getsysstats.c (__get_nprocs): Don't use
gettimeofday vsyscall, just use time.
2011-09-06 Andreas Schwab <schwab@redhat.com>
* sysdeps/unix/sysv/linux/x86_64/gettimeofday.c [!SHARED]: Include

22
sysdeps/unix/sysv/linux/getsysstats.c
View File

@ -37,15 +37,6 @@
#include <not-cancel.h>
#include <kernel-features.h>
#ifndef HAVE_CLOCK_GETTIME_VSYSCALL
# undef INTERNAL_VSYSCALL
# define INTERNAL_VSYSCALL INTERNAL_SYSCALL
# undef INLINE_VSYSCALL
# define INLINE_VSYSCALL INLINE_SYSCALL
#else
# include <bits/libc-vdso.h>
#endif
/* How we can determine the number of available processors depends on
the configuration. There is currently (as of version 2.0.21) no
@ -141,17 +132,10 @@ __get_nprocs ()
static int cached_result;
static time_t timestamp;
#ifdef __ASSUME_POSIX_TIMERS
struct timespec ts;
INTERNAL_SYSCALL_DECL (err);
INTERNAL_VSYSCALL (clock_gettime, err, 2, CLOCK_REALTIME, &ts);
#else
struct timeval ts;
__gettimeofday (&ts, NULL);
#endif
time_t now = time (NULL);
time_t prev = timestamp;
atomic_read_barrier ();
if (ts.tv_sec == prev)
if (now == prev)
return cached_result;
/* XXX Here will come a test for the new system call. */
@ -243,7 +227,7 @@ __get_nprocs ()
out:
cached_result = result;
atomic_write_barrier ();
timestamp = ts.tv_sec;
timestamp = now;
return result;
}