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Portable Hardware Locality (hwloc) Documentation: v1.2

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glibc-sched.h

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00001 /*
00002  * Copyright © 2009 CNRS
00003  * Copyright © 2009-2010 INRIA.  All rights reserved.
00004  * Copyright © 2009-2011 Université Bordeaux 1
00005  * Copyright © 2011 Cisco Systems, Inc.  All rights reserved.
00006  * See COPYING in top-level directory.
00007  */
00008 
00017 #ifndef HWLOC_GLIBC_SCHED_H
00018 #define HWLOC_GLIBC_SCHED_H
00019 
00020 #include <hwloc.h>
00021 #include <hwloc/helper.h>
00022 #include <assert.h>
00023 
00024 #if !defined _GNU_SOURCE || !defined _SCHED_H || !defined CPU_SETSIZE
00025 #error Please make sure to include sched.h before including glibc-sched.h, and define _GNU_SOURCE before any inclusion of sched.h
00026 #endif
00027 
00028 
00029 #ifdef __cplusplus
00030 extern "C" {
00031 #endif
00032 
00033 
00034 #ifdef HWLOC_HAVE_CPU_SET
00035 
00036 
00049 static inline int
00050 hwloc_cpuset_to_glibc_sched_affinity(hwloc_topology_t topology , hwloc_const_cpuset_t hwlocset,
00051                                     cpu_set_t *schedset, size_t schedsetsize)
00052 {
00053 #ifdef CPU_ZERO_S
00054   unsigned cpu;
00055   CPU_ZERO_S(schedsetsize, schedset);
00056   hwloc_bitmap_foreach_begin(cpu, hwlocset)
00057     CPU_SET_S(cpu, schedsetsize, schedset);
00058   hwloc_bitmap_foreach_end();
00059 #else /* !CPU_ZERO_S */
00060   unsigned cpu;
00061   CPU_ZERO(schedset);
00062   assert(schedsetsize == sizeof(cpu_set_t));
00063   hwloc_bitmap_foreach_begin(cpu, hwlocset)
00064     CPU_SET(cpu, schedset);
00065   hwloc_bitmap_foreach_end();
00066 #endif /* !CPU_ZERO_S */
00067   return 0;
00068 }
00069 
00077 static inline int
00078 hwloc_cpuset_from_glibc_sched_affinity(hwloc_topology_t topology , hwloc_cpuset_t hwlocset,
00079                                        const cpu_set_t *schedset, size_t schedsetsize)
00080 {
00081 #ifdef CPU_ZERO_S
00082   int cpu, count;
00083 #endif
00084   hwloc_bitmap_zero(hwlocset);
00085 #ifdef CPU_ZERO_S
00086   count = CPU_COUNT_S(schedsetsize, schedset);
00087   cpu = 0;
00088   while (count) {
00089     if (CPU_ISSET_S(cpu, schedsetsize, schedset)) {
00090       hwloc_bitmap_set(hwlocset, cpu);
00091       count--;
00092     }
00093     cpu++;
00094   }
00095 #else /* !CPU_ZERO_S */
00096   /* sched.h does not support dynamic cpu_set_t (introduced in glibc 2.7),
00097    * assume we have a very old interface without CPU_COUNT (added in 2.6)
00098    */
00099   int cpu;
00100   assert(schedsetsize == sizeof(cpu_set_t));
00101   for(cpu=0; cpu<CPU_SETSIZE; cpu++)
00102     if (CPU_ISSET(cpu, schedset))
00103       hwloc_bitmap_set(hwlocset, cpu);
00104 #endif /* !CPU_ZERO_S */
00105   return 0;
00106 }
00107 
00111 #endif /* CPU_SET */
00112 
00113 
00114 #ifdef __cplusplus
00115 } /* extern "C" */
00116 #endif
00117 
00118 
00119 #endif /* HWLOC_GLIBC_SCHED_H */