nsz Git - libfirm/blob - ir/stat/stat_timing.c

   1
   2 #include <stdio.h>
   3 #include "stat_timing.h"
   4
   5 /* we can only use the scheduling stuff, if that macro is defined in unistd.h */
   6 #if defined(_XOPEN_REALTIME) && _XOPEN_REALTIME != -1
   7
   8 timing_sched_env_t *timing_sched_get(timing_sched_env_t *env)
   9 {
  10         int res;
  11
  12 #ifdef __linux__
  13         res = sched_getaffinity(0, sizeof(env->affinity), &env->affinity);
  14         if (res < 0)
  15                 return NULL;
  16 #endif
  17
  18         env->scheduler = sched_getscheduler(0);
  19         if (env->scheduler < 0)
  20                 return NULL;
  21
  22         res = sched_getparam(0, &env->params);
  23         if (res < 0)
  24                 return NULL;
  25
  26         return env;
  27 }
  28
  29 int timing_sched_set(const timing_sched_env_t *env)
  30 {
  31         int res;
  32
  33 #ifdef __linux__
  34         res = sched_setaffinity(0, sizeof(env->affinity), &env->affinity);
  35         if (res < 0)
  36                 return 0;
  37 #endif
  38
  39         res = sched_setscheduler(0, env->scheduler, &env->params);
  40         if (res < 0)
  41                 return 0;
  42
  43         return 1;
  44 }
  45
  46 timing_sched_env_t *timing_sched_prepare_max_prio(timing_sched_env_t *env)
  47 {
  48         int policy = SCHED_FIFO;
  49 #ifdef __linux__
  50         CPU_ZERO(&env->affinity);
  51         CPU_SET(0, &env->affinity);
  52 #endif
  53         env->scheduler             = policy;
  54         env->params.sched_priority = sched_get_priority_max(policy);
  55         return env;
  56 }
  57
  58 #else
  59
  60 timing_sched_env_t *timing_sched_get(timing_sched_env_t *env)
  61 {
  62         return NULL;
  63 }
  64
  65 int timing_sched_set(const timing_sched_env_t *env)
  66 {
  67         return 0;
  68 }
  69
  70 timing_sched_env_t *timing_sched_prepare_max_prio(timing_sched_env_t *env)
  71 {
  72         return env;
  73 }
  74
  75 #endif /* _POSIX_PRIORITY_SCHEDULING */