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Linux: Add the sched_setattr and sched_getattr functions

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And struct sched_attr.

In sysdeps/unix/sysv/linux/bits/sched.h, the hack that defines
sched_param around the inclusion of <linux/sched/types.h> is quite
ugly, but the definition of struct sched_param has already been
dropped by the kernel, so there is nothing else we can do and maintain
compatibility of <sched.h> with a wide range of kernel header
versions.  (An alternative would involve introducing a separate header
for this functionality, but this seems unnecessary.)

The existing sched_* functions that change scheduler parameters
are already incompatible with PTHREAD_PRIO_PROTECT mutexes, so
there is no harm in adding more functionality in this area.

The documentation mostly defers to the Linux manual pages.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
This commit is contained in:
Florian Weimer
2024-09-11 10:05:08 +02:00
parent 298bc488fd
commit 21571ca0d7
41 changed files with 391 additions and 2 deletions
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44
sysdeps/unix/sysv/linux/bits/sched.h
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@@ -34,10 +34,39 @@
# define SCHED_IDLE 5
# define SCHED_DEADLINE 6
/* Flags that can be used in policy values. */
# define SCHED_RESET_ON_FORK 0x40000000
#endif
#ifdef __USE_GNU
/* Use "" to work around incorrect macro expansion of the
__has_include argument (GCC PR 80005). */
# ifdef __has_include
# if __has_include ("linux/sched/types.h")
/* Some older Linux versions defined sched_param in <linux/sched/types.h>. */
# define sched_param __glibc_mask_sched_param
# include <linux/sched/types.h>
# undef sched_param
# endif
# endif
# ifndef SCHED_ATTR_SIZE_VER0
# include <linux/types.h>
# define SCHED_ATTR_SIZE_VER0 48
# define SCHED_ATTR_SIZE_VER1 56
struct sched_attr
{
__u32 size;
__u32 sched_policy;
__u64 sched_flags;
__s32 sched_nice;
__u32 sched_priority;
__u64 sched_runtime;
__u64 sched_deadline;
__u64 sched_period;
__u32 sched_util_min;
__u32 sched_util_max;
/* Additional fields may be added at the end. */
};
# endif /* !SCHED_ATTR_SIZE_VER0 */
/* Cloning flags. */
# define CSIGNAL 0x000000ff /* Signal mask to be sent at exit. */
# define CLONE_VM 0x00000100 /* Set if VM shared between processes. */
@@ -97,6 +126,17 @@ extern int getcpu (unsigned int *, unsigned int *) __THROW;
/* Switch process to namespace of type NSTYPE indicated by FD. */
extern int setns (int __fd, int __nstype) __THROW;
/* Apply the scheduling attributes from *ATTR to the process or thread TID. */
int sched_setattr (pid_t tid, struct sched_attr *attr, unsigned int flags)
__THROW __nonnull ((2));
/* Obtain the scheduling attributes of the process or thread TID and
store it in *ATTR. */
int sched_getattr (pid_t tid, struct sched_attr *attr, unsigned int size,
unsigned int flags)
__THROW __nonnull ((2)) __attr_access ((__write_only__, 2, 3));
#endif
__END_DECLS