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

Hardware Locality (hwloc) 2.9.1

glibc-sched.h
1 /*
2 * Copyright © 2009 CNRS
3 * Copyright © 2009-2020 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
31 extern "C" {
32 #endif
33
34
35 #ifdef HWLOC_HAVE_CPU_SET
36
37
56 static __hwloc_inline int
57 hwloc_cpuset_to_glibc_sched_affinity(hwloc_topology_t topology __hwloc_attribute_unused, hwloc_const_cpuset_t hwlocset,
58 cpu_set_t *schedset, size_t schedsetsize)
59 {
60 #ifdef CPU_ZERO_S
61 unsigned cpu;
62 CPU_ZERO_S(schedsetsize, schedset);
63 hwloc_bitmap_foreach_begin(cpu, hwlocset)
64 CPU_SET_S(cpu, schedsetsize, schedset);
65 hwloc_bitmap_foreach_end();
66 #else /* !CPU_ZERO_S */
67 unsigned cpu;
68 CPU_ZERO(schedset);
69 assert(schedsetsize == sizeof(cpu_set_t));
70 hwloc_bitmap_foreach_begin(cpu, hwlocset)
71 CPU_SET(cpu, schedset);
72 hwloc_bitmap_foreach_end();
73 #endif /* !CPU_ZERO_S */
74 return 0;
75 }
76
84 static __hwloc_inline int
85 hwloc_cpuset_from_glibc_sched_affinity(hwloc_topology_t topology __hwloc_attribute_unused, hwloc_cpuset_t hwlocset,
86 const cpu_set_t *schedset, size_t schedsetsize)
87 {
88 int cpu;
89 #ifdef CPU_ZERO_S
90 int count;
91 #endif
92 hwloc_bitmap_zero(hwlocset);
93 #ifdef CPU_ZERO_S
94 count = CPU_COUNT_S(schedsetsize, schedset);
95 cpu = 0;
96 while (count) {
97 if (CPU_ISSET_S(cpu, schedsetsize, schedset)) {
98 hwloc_bitmap_set(hwlocset, cpu);
99 count--;
100 }
101 cpu++;
102 }
103 #else /* !CPU_ZERO_S */
104 /* sched.h does not support dynamic cpu_set_t (introduced in glibc 2.7),
105 * assume we have a very old interface without CPU_COUNT (added in 2.6)
106 */
107 assert(schedsetsize == sizeof(cpu_set_t));
108 for(cpu=0; cpu<CPU_SETSIZE; cpu++)
109 if (CPU_ISSET(cpu, schedset))
110 hwloc_bitmap_set(hwlocset, cpu);
111 #endif /* !CPU_ZERO_S */
112 return 0;
113 }
114
118 #endif /* CPU_SET */
119
120
121 #ifdef __cplusplus
122 } /* extern "C" */
123 #endif
124
125
126 #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:142
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:140
hwloc_topology_t
struct hwloc_topology * hwloc_topology_t
Topology context.
Definition: hwloc.h:692
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:370
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:384
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:57
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:85