compat/cpu.h

   1 #ifndef SQUID_COMPAT_CPU_H
   2 #define SQUID_COMPAT_CPU_H
   3
   4 #if HAVE_CPU_AFFINITY
   5
   6 #if HAVE_SCHED_H
   7 #include <sched.h>
   8 #endif
   9
  10 // glibc prior to 2.6 lacks CPU_COUNT
  11 #ifndef CPU_COUNT
  12 #define CPU_COUNT(set) CpuCount(set)
  13 /// CPU_COUNT replacement
  14 inline int
  15 CpuCount(const cpu_set_t *set)
  16 {
  17     int count = 0;
  18     for (int i = 0; i < CPU_SETSIZE; ++i) {
  19         if (CPU_ISSET(i, set))
  20             ++count;
  21     }
  22     return count;
  23 }
  24 #endif /* CPU_COUNT */
  25
  26 // glibc prior to 2.7 lacks CPU_AND
  27 #ifndef CPU_AND
  28 #define CPU_AND(destset, srcset1, srcset2) CpuAnd((destset), (srcset1), (srcset2))
  29 /// CPU_AND replacement
  30 inline void
  31 CpuAnd(cpu_set_t *destset, const cpu_set_t *srcset1, const cpu_set_t *srcset2)
  32 {
  33     for (int i = 0; i < CPU_SETSIZE; ++i) {
  34         if (CPU_ISSET(i, srcset1) && CPU_ISSET(i, srcset2))
  35             CPU_SET(i, destset);
  36         else
  37             CPU_CLR(i, destset);
  38     }
  39 }
  40 #endif /* CPU_AND */
  41
  42 #else /* HAVE_CPU_AFFINITY */
  43
  44 #if HAVE_ERRNO_H
  45 #include <errno.h> /* for ENOTSUP */
  46 #endif
  47
  48 /* failing replacements to minimize the number of if-HAVE_CPU_AFFINITYs */
  49 typedef struct {
  50     int bits;
  51 } cpu_set_t;
  52 #define CPU_SETSIZE 0
  53 #define CPU_COUNT(set) 0
  54 #define CPU_AND(destset, srcset1, srcset2) (void)0
  55 #define CPU_ZERO(set) (void)0
  56 #define CPU_SET(cpu, set) (void)0
  57 #define CPU_CLR(cpu, set) (void)0
  58 inline int sched_setaffinity(int, size_t, cpu_set_t *) { return ENOTSUP; }
  59 inline int sched_getaffinity(int, size_t, cpu_set_t *) { return ENOTSUP; }
  60
  61 #endif /* HAVE_CPU_AFFINITY */
  62
  63 #endif /* SQUID_COMPAT_CPU_H */