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Portable Hardware Locality (hwloc) Documentation: v1.8

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glibc-sched.h
1 /*
2  * Copyright © 2009 CNRS
3  * Copyright © 2009-2013 inria. All rights reserved.
4  * Copyright © 2009-2011 Université Bordeaux 1
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 #include <assert.h>
23 
24 #if !defined _GNU_SOURCE || !defined _SCHED_H || (!defined CPU_SETSIZE && !defined sched_priority)
25 #error Please make sure to include sched.h before including glibc-sched.h, and define _GNU_SOURCE before any inclusion of sched.h
26 #endif
27 
28 
29 #ifdef __cplusplus
30 extern "C" {
31 #endif
32 
33 
34 #ifdef HWLOC_HAVE_CPU_SET
35 
36 
55 static __hwloc_inline int
57  cpu_set_t *schedset, size_t schedsetsize)
58 {
59 #ifdef CPU_ZERO_S
60  unsigned cpu;
61  CPU_ZERO_S(schedsetsize, schedset);
62  hwloc_bitmap_foreach_begin(cpu, hwlocset)
63  CPU_SET_S(cpu, schedsetsize, schedset);
65 #else /* !CPU_ZERO_S */
66  unsigned cpu;
67  CPU_ZERO(schedset);
68  assert(schedsetsize == sizeof(cpu_set_t));
69  hwloc_bitmap_foreach_begin(cpu, hwlocset)
70  CPU_SET(cpu, schedset);
72 #endif /* !CPU_ZERO_S */
73  return 0;
74 }
75 
83 static __hwloc_inline int
84 hwloc_cpuset_from_glibc_sched_affinity(hwloc_topology_t topology __hwloc_attribute_unused, hwloc_cpuset_t hwlocset,
85  const cpu_set_t *schedset, size_t schedsetsize)
86 {
87  int cpu;
88 #ifdef CPU_ZERO_S
89  int count;
90 #endif
91  hwloc_bitmap_zero(hwlocset);
92 #ifdef CPU_ZERO_S
93  count = CPU_COUNT_S(schedsetsize, schedset);
94  cpu = 0;
95  while (count) {
96  if (CPU_ISSET_S(cpu, schedsetsize, schedset)) {
97  hwloc_bitmap_set(hwlocset, cpu);
98  count--;
99  }
100  cpu++;
101  }
102 #else /* !CPU_ZERO_S */
103  /* sched.h does not support dynamic cpu_set_t (introduced in glibc 2.7),
104  * assume we have a very old interface without CPU_COUNT (added in 2.6)
105  */
106  assert(schedsetsize == sizeof(cpu_set_t));
107  for(cpu=0; cpu<CPU_SETSIZE; cpu++)
108  if (CPU_ISSET(cpu, schedset))
109  hwloc_bitmap_set(hwlocset, cpu);
110 #endif /* !CPU_ZERO_S */
111  return 0;
112 }
113 
117 #endif /* CPU_SET */
118 
119 
120 #ifdef __cplusplus
121 } /* extern "C" */
122 #endif
123 
124 
125 #endif /* HWLOC_GLIBC_SCHED_H */
HWLOC_DECLSPEC void hwloc_bitmap_set(hwloc_bitmap_t bitmap, unsigned id)
Add index id in bitmap bitmap.
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)
Convert glibc sched affinity CPU set schedset into hwloc CPU set.
Definition: glibc-sched.h:84
#define hwloc_bitmap_foreach_begin(id, bitmap)
Loop macro iterating on bitmap bitmap.
Definition: bitmap.h:265
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)
Convert hwloc CPU set toposet into glibc sched affinity CPU set schedset.
Definition: glibc-sched.h:56
hwloc_const_bitmap_t hwloc_const_cpuset_t
A non-modifiable hwloc_cpuset_t.
Definition: hwloc.h:118
struct hwloc_topology * hwloc_topology_t
Topology context.
Definition: hwloc.h:577
#define hwloc_bitmap_foreach_end()
Definition: bitmap.h:275
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:116
HWLOC_DECLSPEC void hwloc_bitmap_zero(hwloc_bitmap_t bitmap)
Empty the bitmap bitmap.