compat/cpu.h

   1 /*
   2  * Copyright (C) 1996-2020 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_ERRNO_H
  13 #include <errno.h> /* for ENOTSUP */
  14 #endif
  15 #if HAVE_SCHED_H
  16 #include <sched.h>
  17 #endif
  18
  19 #if !HAVE_CPU_AFFINITY
  20 /* failing replacements to minimize the number of if-HAVE_CPU_AFFINITYs */
  21 #if !HAVE_CPU_SET_T
  22 typedef struct {
  23     int bits;
  24 } cpu_set_t;
  25 #endif
  26 inline int sched_setaffinity(int, size_t, cpu_set_t *) { return ENOTSUP; }
  27 inline int sched_getaffinity(int, size_t, cpu_set_t *) { return ENOTSUP; }
  28 #endif /* HAVE_CPU_AFFINITY */
  29
  30 #if !defined(CPU_SETSIZE)
  31 #define CPU_SETSIZE 0
  32 #endif
  33
  34 #if !defined(CPU_ZERO)
  35 #define CPU_ZERO(set) (void)0
  36 #endif
  37
  38 #if !defined(CPU_SET)
  39 #define CPU_SET(cpu, set) (void)0
  40 #endif
  41
  42 #if !defined(CPU_CLR)
  43 #define CPU_CLR(cpu, set) (void)0
  44 #endif
  45
  46 #if !defined(CPU_ISSET)
  47 #define CPU_ISSET(cpu, set) false
  48 #endif
  49
  50 // glibc prior to 2.6 lacks CPU_COUNT
  51 #ifndef CPU_COUNT
  52 #define CPU_COUNT(set) CpuCount(set)
  53 /// CPU_COUNT replacement
  54 inline int
  55 CpuCount(const cpu_set_t *set)
  56 {
  57     int count = 0;
  58     for (int i = 0; i < CPU_SETSIZE; ++i) {
  59         if (CPU_ISSET(i, set))
  60             ++count;
  61     }
  62     return count;
  63 }
  64 #endif /* CPU_COUNT */
  65
  66 // glibc prior to 2.7 lacks CPU_AND
  67 #ifndef CPU_AND
  68 #define CPU_AND(destset, srcset1, srcset2) CpuAnd((destset), (srcset1), (srcset2))
  69 /// CPU_AND replacement
  70 inline void
  71 CpuAnd(cpu_set_t *destset, const cpu_set_t *srcset1, const cpu_set_t *srcset2)
  72 {
  73     for (int i = 0; i < CPU_SETSIZE; ++i) {
  74         if (CPU_ISSET(i, srcset1) && CPU_ISSET(i, srcset2))
  75             CPU_SET(i, destset);
  76         else
  77             CPU_CLR(i, destset);
  78     }
  79 }
  80 #endif /* CPU_AND */
  81
  82 #endif /* SQUID_COMPAT_CPU_H */
  83