glibc-sched.h
/*
* SPDX-License-Identifier: BSD-3-Clause
* Copyright © 2009 CNRS
* Copyright © 2009-2023 Inria. All rights reserved.
* Copyright © 2009-2011 Université Bordeaux
* Copyright © 2011 Cisco Systems, Inc. All rights reserved.
* See COPYING in top-level directory.
*/
#ifndef HWLOC_GLIBC_SCHED_H
#define HWLOC_GLIBC_SCHED_H
#include "hwloc.h"
#include "hwloc/helper.h"
#include <assert.h>
#if !defined _GNU_SOURCE || (!defined _SCHED_H && !defined _SCHED_H_) || (!defined CPU_SETSIZE && !defined sched_priority)
#error Please make sure to include sched.h before including glibc-sched.h, and define _GNU_SOURCE before any inclusion of sched.h
#endif
#ifdef __cplusplus
extern "C" {
#endif
#ifdef HWLOC_HAVE_CPU_SET
static __hwloc_inline int
hwloc_cpuset_to_glibc_sched_affinity(hwloc_topology_t topology __hwloc_attribute_unused, hwloc_const_cpuset_t hwlocset,
cpu_set_t *schedset, size_t schedsetsize)
{
#ifdef CPU_ZERO_S
unsigned cpu;
CPU_ZERO_S(schedsetsize, schedset);
hwloc_bitmap_foreach_begin(cpu, hwlocset)
CPU_SET_S(cpu, schedsetsize, schedset);
hwloc_bitmap_foreach_end();
#else /* !CPU_ZERO_S */
unsigned cpu;
CPU_ZERO(schedset);
assert(schedsetsize == sizeof(cpu_set_t));
hwloc_bitmap_foreach_begin(cpu, hwlocset)
CPU_SET(cpu, schedset);
hwloc_bitmap_foreach_end();
#endif /* !CPU_ZERO_S */
return 0;
}
static __hwloc_inline int
hwloc_cpuset_from_glibc_sched_affinity(hwloc_topology_t topology __hwloc_attribute_unused, hwloc_cpuset_t hwlocset,
const cpu_set_t *schedset, size_t schedsetsize)
{
int cpu;
#ifdef CPU_ZERO_S
int count;
#endif
hwloc_bitmap_zero(hwlocset);
#ifdef CPU_ZERO_S
count = CPU_COUNT_S(schedsetsize, schedset);
cpu = 0;
while (count) {
if (CPU_ISSET_S(cpu, schedsetsize, schedset)) {
if (hwloc_bitmap_set(hwlocset, cpu) < 0)
return -1;
count--;
}
cpu++;
}
#else /* !CPU_ZERO_S */
/* sched.h does not support dynamic cpu_set_t (introduced in glibc 2.7),
* assume we have a very old interface without CPU_COUNT (added in 2.6)
*/
assert(schedsetsize == sizeof(cpu_set_t));
for(cpu=0; cpu<CPU_SETSIZE; cpu++)
if (CPU_ISSET(cpu, schedset))
if (hwloc_bitmap_set(hwlocset, cpu) < 0)
return -1;
#endif /* !CPU_ZERO_S */
return 0;
}
#endif /* CPU_SET */
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif /* HWLOC_GLIBC_SCHED_H */
hwloc_const_cpuset_t
hwloc_const_bitmap_t hwloc_const_cpuset_t
A non-modifiable hwloc_cpuset_t.
Definition hwloc.h:167
hwloc_cpuset_t
hwloc_bitmap_t hwloc_cpuset_t
A CPU set is a bitmap whose bits are set according to CPU physical OS indexes.
Definition hwloc.h:165
hwloc_topology_t
struct hwloc_topology * hwloc_topology_t
Topology context.
Definition hwloc.h:748
hwloc_bitmap_set
int hwloc_bitmap_set(hwloc_bitmap_t bitmap, unsigned id)
Add index id in bitmap bitmap.
hwloc_bitmap_foreach_begin
#define hwloc_bitmap_foreach_begin(id, bitmap)
Loop macro iterating on bitmap bitmap.
Definition bitmap.h:455
hwloc_bitmap_zero
void hwloc_bitmap_zero(hwloc_bitmap_t bitmap)
Empty the bitmap bitmap.
hwloc_bitmap_foreach_end
#define hwloc_bitmap_foreach_end()
End of loop macro iterating on a bitmap.
Definition bitmap.h:469
hwloc_cpuset_to_glibc_sched_affinity
int hwloc_cpuset_to_glibc_sched_affinity(hwloc_topology_t topology, hwloc_const_cpuset_t hwlocset, cpu_set_t *schedset, size_t schedsetsize)
Convert hwloc CPU set toposet into glibc sched affinity CPU set schedset.
Definition glibc-sched.h:60
hwloc_cpuset_from_glibc_sched_affinity
int hwloc_cpuset_from_glibc_sched_affinity(hwloc_topology_t topology, hwloc_cpuset_t hwlocset, const cpu_set_t *schedset, size_t schedsetsize)
Convert glibc sched affinity CPU set schedset into hwloc CPU set.
Definition glibc-sched.h:91