Hardware Locality (hwloc): glibc-sched.h Source File

Hardware Locality (hwloc) 2.11.2

glibc-sched.h
1/*
2 * Copyright © 2009 CNRS
3 * Copyright © 2009-2023 Inria. All rights reserved.
4 * Copyright © 2009-2011 Université Bordeaux
5 * Copyright © 2011 Cisco Systems, Inc. All rights reserved.
6 * See COPYING in top-level directory.
7 */
8
17#ifndef HWLOC_GLIBC_SCHED_H
18#define HWLOC_GLIBC_SCHED_H
19
20#include "hwloc.h"
21#include "hwloc/helper.h"
22
23#include <assert.h>
24
25#if !defined _GNU_SOURCE || (!defined _SCHED_H && !defined _SCHED_H_) || (!defined CPU_SETSIZE && !defined sched_priority)
26#error Please make sure to include sched.h before including glibc-sched.h, and define _GNU_SOURCE before any inclusion of sched.h
27#endif
28
29
30#ifdef __cplusplus
31extern "C" {
32#endif
33
34
35#ifdef HWLOC_HAVE_CPU_SET
36
37
58static __hwloc_inline int
59hwloc_cpuset_to_glibc_sched_affinity(hwloc_topology_t topology __hwloc_attribute_unused, hwloc_const_cpuset_t hwlocset,
60 cpu_set_t *schedset, size_t schedsetsize)
61{
62#ifdef CPU_ZERO_S
63 unsigned cpu;
64 CPU_ZERO_S(schedsetsize, schedset);
65 hwloc_bitmap_foreach_begin(cpu, hwlocset)
66 CPU_SET_S(cpu, schedsetsize, schedset);
67 hwloc_bitmap_foreach_end();
68#else /* !CPU_ZERO_S */
69 unsigned cpu;
70 CPU_ZERO(schedset);
71 assert(schedsetsize == sizeof(cpu_set_t));
72 hwloc_bitmap_foreach_begin(cpu, hwlocset)
73 CPU_SET(cpu, schedset);
74 hwloc_bitmap_foreach_end();
75#endif /* !CPU_ZERO_S */
76 return 0;
77}
78
89static __hwloc_inline int
90hwloc_cpuset_from_glibc_sched_affinity(hwloc_topology_t topology __hwloc_attribute_unused, hwloc_cpuset_t hwlocset,
91 const cpu_set_t *schedset, size_t schedsetsize)
92{
93 int cpu;
94#ifdef CPU_ZERO_S
95 int count;
96#endif
97 hwloc_bitmap_zero(hwlocset);
98#ifdef CPU_ZERO_S
99 count = CPU_COUNT_S(schedsetsize, schedset);
100 cpu = 0;
101 while (count) {
102 if (CPU_ISSET_S(cpu, schedsetsize, schedset)) {
103 if (hwloc_bitmap_set(hwlocset, cpu) < 0)
104 return -1;
105 count--;
106 }
107 cpu++;
108 }
109#else /* !CPU_ZERO_S */
110 /* sched.h does not support dynamic cpu_set_t (introduced in glibc 2.7),
111 * assume we have a very old interface without CPU_COUNT (added in 2.6)
112 */
113 assert(schedsetsize == sizeof(cpu_set_t));
114 for(cpu=0; cpu<CPU_SETSIZE; cpu++)
115 if (CPU_ISSET(cpu, schedset))
116 if (hwloc_bitmap_set(hwlocset, cpu) < 0)
117 return -1;
118#endif /* !CPU_ZERO_S */
119 return 0;
120}
121
125#endif /* CPU_SET */
126
127
128#ifdef __cplusplus
129} /* extern "C" */
130#endif
131
132
133#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:163
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:161
hwloc_topology_t
struct hwloc_topology * hwloc_topology_t
Topology context.
Definition hwloc.h:742
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:387
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:401
hwloc_cpuset_to_glibc_sched_affinity
static 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:59
hwloc_cpuset_from_glibc_sched_affinity
static 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:90