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* sysdeps/unix/sysv/linux/bits/sched.h: Declare sched_getcpu.

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* sysdeps/unix/sysv/linux/sched_getcpu.c: New file.
	* sysdeps/unix/sysv/linux/x86_64/sched_getcpu.S: New file.
	* sysdeps/unix/sysv/linux/Versions: Export sched_getcpu for
	GLIBC_2.6.
This commit is contained in:
Ulrich Drepper 2007-04-26 04:50:57 +00:00
parent 46d51e9bd3
commit ec08f13dad
6 changed files with 100 additions and 1 deletions
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8
ChangeLog
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@ -1,3 +1,11 @@
2007-04-25 Ulrich Drepper <drepper@redhat.com>
* sysdeps/unix/sysv/linux/bits/sched.h: Declare sched_getcpu.
* sysdeps/unix/sysv/linux/sched_getcpu.c: New file.
* sysdeps/unix/sysv/linux/x86_64/sched_getcpu.S: New file.
* sysdeps/unix/sysv/linux/Versions: Export sched_getcpu for
GLIBC_2.6.
2007-04-25 Jakub Jelinek <jakub@redhat.com>
* sysdeps/unix/sysv/linux/check_pf.c (make_request): Return -1 instead

1
nptl/sysdeps/x86_64/tcb-offsets.sym
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@ -11,3 +11,4 @@ CLEANUP_PREV offsetof (struct _pthread_cleanup_buffer, __prev)
MUTEX_FUTEX offsetof (pthread_mutex_t, __data.__lock)
MULTIPLE_THREADS_OFFSET offsetof (tcbhead_t, multiple_threads)
POINTER_GUARD offsetof (tcbhead_t, pointer_guard)
VGETCPU_CACHE_OFFSET offsetof (tcbhead_t, vgetcpu_cache)

2
sysdeps/unix/sysv/linux/Versions
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@ -127,7 +127,7 @@ libc {
splice; tee; vmsplice;
}
GLIBC_2.6 {
epoll_pwait; sync_file_range;
epoll_pwait; sync_file_range; sched_getcpu;
}
GLIBC_PRIVATE {
# functions used in other libraries

3
sysdeps/unix/sysv/linux/bits/sched.h
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@ -77,6 +77,9 @@ extern int clone (int (*__fn) (void *__arg), void *__child_stack,
/* Unshare the specified resources. */
extern int unshare (int __flags) __THROW;
/* Get index of currently used CPU. */
extern int sched_getcpu (void) __THROW;
#endif
__END_DECLS

37
sysdeps/unix/sysv/linux/sched_getcpu.c Normal file
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@ -0,0 +1,37 @@
/* Copyright (C) 2007 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <sched.h>
#include <sysdep.h>
int
sched_getcpu (void)
{
#ifdef __NR_getcpu
unsigned int cpu;
INTERNAL_SYSCALL_DECL (err);
int r = INTERNAL_SYSCALL (getcpu, err, &cpu, NULL, NULL);
return (INTERNAL_SYSCALL_ERROR (r, err)
? INTERNAL_SYSCALL_ERRNO (r, err) : cpu);
#else
__set_errno (ENOSYS);
return -1;
#endif
}

50
sysdeps/unix/sysv/linux/x86_64/sched_getcpu.S Normal file
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@ -0,0 +1,50 @@
/* Copyright (C) 2007 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <sysdep.h>
#include <tls.h>
#define _ERRNO_H 1
#include <bits/errno.h>
/* For the calculation see asm/vsyscall.h. */
#define VSYSCALL_ADDR_vgetcpu 0xffffffffff600800
ENTRY (sched_getcpu)
/* Align stack and create local variable for result. */
sub $0x8, %rsp
cfi_adjust_cfa_offset(8)
movq %rsp, %rdi
xorl %esi, %esi
movl $VGETCPU_CACHE_OFFSET, %edx
addq %fs:0, %rdx
movq $VSYSCALL_ADDR_vgetcpu, %rax
callq *%rax
cmpq $-4095, %rdi
jae SYSCALL_ERROR_LABEL
movl (%rsp), %eax
L(pseudo_end):
add $0x8, %rsp
cfi_adjust_cfa_offset(-8)
ret
PSEUDO_END(sched_getcpu)