[PATCH 0/3] Add the sched_setattr, sched_getattr functions

[Carlos O'Donell]

On 9/5/24 2:33 PM, Florian Weimer wrote:
> These are straightforward system call wrappers.  Like the existing
> sched_* scheduler policy functions, sched_setattr interacts poorly with
> PTHREAD_PRIO_PROTECT mutexes.

As noted by Jopseh Myers in 2015, these interfaces should have had wrappers
a long time ago following:
https://sourceware.org/glibc/wiki/Consensus#WIP:_Kernel_syscalls_wrappers

I think these APIs meet the goals outlined there, modulo their poor interaction
with the pthread_* APIs, which is something that can be improved over time.

Without theses APIs the SCHED_DEADLINE support in the kernel has be manually
added to things chatr.

> Documentation mostly refers to the manual pages.
> 
> Tested on i686-linux-gnu, x86_64-linux-gnu.  Built with
> build-many-glibcs.py.
> 
> Thanks,
> Florian
> 
> Florian Weimer (3):
>   manual: Extract the @manpageurl{func,sec} macro
>   Linux: Add the sched_setattr and sched_getattr functions
>   Linux: Add missing scheduler constants to <sched.h>
> 
>  NEWS                                          |   3 +
>  manual/macros.texi                            |   7 +-
>  manual/resource.texi                          | 103 +++++++++++++++++
>  sysdeps/unix/sysv/linux/Makefile              |  13 +++
>  sysdeps/unix/sysv/linux/Versions              |   4 +
>  sysdeps/unix/sysv/linux/aarch64/libc.abilist  |   2 +
>  sysdeps/unix/sysv/linux/alpha/libc.abilist    |   2 +
>  sysdeps/unix/sysv/linux/arc/libc.abilist      |   2 +
>  sysdeps/unix/sysv/linux/arm/be/libc.abilist   |   2 +
>  sysdeps/unix/sysv/linux/arm/le/libc.abilist   |   2 +
>  sysdeps/unix/sysv/linux/bits/sched.h          |  58 +++++++++-
>  sysdeps/unix/sysv/linux/csky/libc.abilist     |   2 +
>  sysdeps/unix/sysv/linux/hppa/libc.abilist     |   2 +
>  sysdeps/unix/sysv/linux/i386/libc.abilist     |   2 +
>  .../sysv/linux/loongarch/lp64/libc.abilist    |   2 +
>  .../sysv/linux/m68k/coldfire/libc.abilist     |   2 +
>  .../unix/sysv/linux/m68k/m680x0/libc.abilist  |   2 +
>  .../sysv/linux/microblaze/be/libc.abilist     |   2 +
>  .../sysv/linux/microblaze/le/libc.abilist     |   2 +
>  .../sysv/linux/mips/mips32/fpu/libc.abilist   |   2 +
>  .../sysv/linux/mips/mips32/nofpu/libc.abilist |   2 +
>  .../sysv/linux/mips/mips64/n32/libc.abilist   |   2 +
>  .../sysv/linux/mips/mips64/n64/libc.abilist   |   2 +
>  sysdeps/unix/sysv/linux/nios2/libc.abilist    |   2 +
>  sysdeps/unix/sysv/linux/or1k/libc.abilist     |   2 +
>  .../linux/powerpc/powerpc32/fpu/libc.abilist  |   2 +
>  .../powerpc/powerpc32/nofpu/libc.abilist      |   2 +
>  .../linux/powerpc/powerpc64/be/libc.abilist   |   2 +
>  .../linux/powerpc/powerpc64/le/libc.abilist   |   2 +
>  .../unix/sysv/linux/riscv/rv32/libc.abilist   |   2 +
>  .../unix/sysv/linux/riscv/rv64/libc.abilist   |   2 +
>  .../unix/sysv/linux/s390/s390-32/libc.abilist |   2 +
>  .../unix/sysv/linux/s390/s390-64/libc.abilist |   2 +
>  sysdeps/unix/sysv/linux/sched_getattr.c       |  27 +++++
>  sysdeps/unix/sysv/linux/sched_setattr.c       |  26 +++++
>  sysdeps/unix/sysv/linux/sh/be/libc.abilist    |   2 +
>  sysdeps/unix/sysv/linux/sh/le/libc.abilist    |   2 +
>  .../sysv/linux/sparc/sparc32/libc.abilist     |   2 +
>  .../sysv/linux/sparc/sparc64/libc.abilist     |   2 +
>  sysdeps/unix/sysv/linux/tst-sched-consts.py   |  56 +++++++++
>  sysdeps/unix/sysv/linux/tst-sched_setattr.c   | 106 ++++++++++++++++++
>  .../unix/sysv/linux/x86_64/64/libc.abilist    |   2 +
>  .../unix/sysv/linux/x86_64/x32/libc.abilist   |   2 +
>  43 files changed, 465 insertions(+), 4 deletions(-)
>  create mode 100644 sysdeps/unix/sysv/linux/sched_getattr.c
>  create mode 100644 sysdeps/unix/sysv/linux/sched_setattr.c
>  create mode 100644 sysdeps/unix/sysv/linux/tst-sched-consts.py
>  create mode 100644 sysdeps/unix/sysv/linux/tst-sched_setattr.c
> 
> 
> base-commit: 3e4a01870ef9605ccf6475215a4b32aa86d5d206

-- 
Cheers,
Carlos.