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author | H.J. Lu <hjl.tools@gmail.com> | 2018-12-07 09:17:37 -0800 |
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committer | H.J. Lu <hjl.tools@gmail.com> | 2018-12-07 09:17:50 -0800 |
commit | a092ca9453df677053787b376322362e3bbe91ca (patch) | |
tree | 949e1751f3547cb2628420f06e4dc48c2c6f4934 /manual | |
parent | 7c857b6f0db01e8d6876e601f0cbcd21d23e4dd5 (diff) | |
download | glibc-a092ca9453df677053787b376322362e3bbe91ca.zip glibc-a092ca9453df677053787b376322362e3bbe91ca.tar.gz glibc-a092ca9453df677053787b376322362e3bbe91ca.tar.bz2 |
Add getcpu
Add
#include <sched.h>
int getcpu (unsigned int *cpu, unsigned int *node);
to return currently used CPU and NUMA node.
Tested on x86-64, x32 and i686 as well as with build-many-glibcs.py.
* NEWS: Mention getcpu.
* include/sched.h (__getcpu): New libc_hidden_proto.
* manual/resource.texi: Document getcpu.
* sysdeps/unix/sysv/linux/Makefile (sysdep_routines): Add getcpu.
* sysdeps/unix/sysv/linux/Versions (GLIBC_2.29): Add getcpu.
* sysdeps/unix/sysv/linux/aarch64/libc.abilist: Add getcpu.
* sysdeps/unix/sysv/linux/alpha/libc.abilist: Likewise.
* sysdeps/unix/sysv/linux/arm/libc.abilist: Likewise.
* sysdeps/unix/sysv/linux/hppa/libc.abilist: Likewise.
* sysdeps/unix/sysv/linux/i386/libc.abilist: Likewise.
* sysdeps/unix/sysv/linux/ia64/libc.abilist: Likewise.
* sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist: Likewise.
* sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist: Likewise.
* sysdeps/unix/sysv/linux/microblaze/libc.abilist: Likewise.
* sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist: Likewise.
* sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist:
Likewise.
* sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist: Likewise.
* sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist: Likewise.
* sysdeps/unix/sysv/linux/nios2/libc.abilist: Likewise.
* sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist:
Likewise.
* sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist:
Likewise.
* sysdeps/unix/sysv/linux/powerpc/powerpc64/libc-le.abilist:
Likewise.
* sysdeps/unix/sysv/linux/powerpc/powerpc64/libc.abilist:
Likewise.
* sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist: Likewise.
* sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist: Likewise.
* sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist: Likewise.
* sysdeps/unix/sysv/linux/sh/libc.abilist: Likewise.
* sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist: Likewise.
* sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist: Likewise.
* sysdeps/unix/sysv/linux/x86_64/64/libc.abilist: Likewise.
* sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist: Likewise.
* sysdeps/unix/sysv/linux/bits/sched.h (getcpu): New prototype.
* sysdeps/unix/sysv/linux/getcpu.c: New file.
* sysdeps/unix/sysv/linux/tst-skeleton-affinity.c (test_size):
Also check getcpu.
Diffstat (limited to 'manual')
-rw-r--r-- | manual/resource.texi | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/manual/resource.texi b/manual/resource.texi index 8bc2a80..8c4c92a 100644 --- a/manual/resource.texi +++ b/manual/resource.texi @@ -1429,6 +1429,27 @@ not leave a processor for the process or thread to run on. This function is a GNU extension and is declared in @file{sched.h}. @end deftypefun +@deftypefun int getcpu (unsigned int *cpu, unsigned int *node) +@standards{Linux, <sched.h>} +@safety{@prelim{}@mtsafe{}@assafe{}@acsafe{}} +The @code{getcpu} function identifies the processor and node on which +the calling thread or process is currently running and writes them into +the integers pointed to by the @var{cpu} and @var{node} arguments. The +processor is a unique nonnegative integer identifying a CPU. The node +is a unique nonnegative integer identifying a NUMA node. When either +@var{cpu} or @var{node} is @code{NULL}, nothing is written to the +respective pointer. + +The return value is @code{0} on success and @code{-1} on failure. The +following @code{errno} error condition is defined for this function: + +@table @code +@item ENOSYS +The operating system does not support this function. +@end table + +This function is Linux-specific and is declared in @file{sched.h}. +@end deftypefun @node Memory Resources @section Querying memory available resources |