compat/cpu.h

   1 /*
   2  * Copyright (C) 1996-2015 The Squid Software Foundation and contributors
   3  *
   4  * Squid software is distributed under GPLv2+ license and includes
   5  * contributions from numerous individuals and organizations.
   6  * Please see the COPYING and CONTRIBUTORS files for details.
   7  */
   8
   9 #ifndef SQUID_COMPAT_CPU_H
  10 #define SQUID_COMPAT_CPU_H
  11
  12 #if HAVE_CPU_AFFINITY
  13
  14 #if HAVE_SCHED_H
  15 #include <sched.h>
  16 #endif
  17
  18 // glibc prior to 2.6 lacks CPU_COUNT
  19 #ifndef CPU_COUNT
  20 #define CPU_COUNT(set) CpuCount(set)
  21 /// CPU_COUNT replacement
  22 inline int
  23 CpuCount(const cpu_set_t *set)
  24 {
  25     int count = 0;
  26     for (int i = 0; i < CPU_SETSIZE; ++i) {
  27         if (CPU_ISSET(i, set))
  28             ++count;
  29     }
  30     return count;
  31 }
  32 #endif /* CPU_COUNT */
  33
  34 // glibc prior to 2.7 lacks CPU_AND
  35 #ifndef CPU_AND
  36 #define CPU_AND(destset, srcset1, srcset2) CpuAnd((destset), (srcset1), (srcset2))
  37 /// CPU_AND replacement
  38 inline void
  39 CpuAnd(cpu_set_t *destset, const cpu_set_t *srcset1, const cpu_set_t *srcset2)
  40 {
  41     for (int i = 0; i < CPU_SETSIZE; ++i) {
  42         if (CPU_ISSET(i, srcset1) && CPU_ISSET(i, srcset2))
  43             CPU_SET(i, destset);
  44         else
  45             CPU_CLR(i, destset);
  46     }
  47 }
  48 #endif /* CPU_AND */
  49
  50 #else /* HAVE_CPU_AFFINITY */
  51
  52 #if HAVE_ERRNO_H
  53 #include <errno.h> /* for ENOTSUP */
  54 #endif
  55
  56 /* failing replacements to minimize the number of if-HAVE_CPU_AFFINITYs */
  57 typedef struct {
  58     int bits;
  59 } cpu_set_t;
  60 #define CPU_SETSIZE 0
  61 #define CPU_COUNT(set) 0
  62 #define CPU_AND(destset, srcset1, srcset2) (void)0
  63 #define CPU_ZERO(set) (void)0
  64 #define CPU_SET(cpu, set) (void)0
  65 #define CPU_CLR(cpu, set) (void)0
  66 inline int sched_setaffinity(int, size_t, cpu_set_t *) { return ENOTSUP; }
  67 inline int sched_getaffinity(int, size_t, cpu_set_t *) { return ENOTSUP; }
  68
  69 #endif /* HAVE_CPU_AFFINITY */
  70
  71 #endif /* SQUID_COMPAT_CPU_H */
  72