ext/sleepy_penguin/init.c

   1 #define _GNU_SOURCE
   2 #include <unistd.h>
   3 #include <sys/types.h>
   4 #define L1_CACHE_LINE_MAX 128 /* largest I've seen (Pentium 4) */
   5 size_t rb_sp_l1_cache_line_size;
   6
   7 #ifdef HAVE_SYS_EVENT_H
   8 void sleepy_penguin_init_kqueue(void);
   9 #else
  10 #  define sleepy_penguin_init_kqueue() for(;0;)
  11 #endif
  12
  13 #ifdef HAVE_SYS_EPOLL_H
  14 void sleepy_penguin_init_epoll(void);
  15 #else
  16 #  define sleepy_penguin_init_epoll() for(;0;)
  17 #endif
  18
  19 #ifdef HAVE_SYS_TIMERFD_H
  20 void sleepy_penguin_init_timerfd(void);
  21 #else
  22 #  define sleepy_penguin_init_timerfd() for(;0;)
  23 #endif
  24
  25 #ifdef HAVE_SYS_EVENTFD_H
  26 void sleepy_penguin_init_eventfd(void);
  27 #else
  28 #  define sleepy_penguin_init_eventfd() for(;0;)
  29 #endif
  30
  31 #ifdef HAVE_SYS_INOTIFY_H
  32 void sleepy_penguin_init_inotify(void);
  33 #else
  34 #  define sleepy_penguin_init_inotify() for(;0;)
  35 #endif
  36
  37 #ifdef HAVE_SYS_SIGNALFD_H
  38 void sleepy_penguin_init_signalfd(void);
  39 #else
  40 #  define sleepy_penguin_init_signalfd() for(;0;)
  41 #endif
  42
  43 static size_t l1_cache_line_size_detect(void)
  44 {
  45 #ifdef _SC_LEVEL1_DCACHE_LINESIZE
  46         long tmp = sysconf(_SC_LEVEL1_DCACHE_LINESIZE);
  47
  48         if (tmp > 0 && tmp <= L1_CACHE_LINE_MAX)
  49                 return (size_t)tmp;
  50 #endif /* _SC_LEVEL1_DCACHE_LINESIZE */
  51         return L1_CACHE_LINE_MAX;
  52 }
  53
  54 void Init_sleepy_penguin_ext(void)
  55 {
  56         rb_sp_l1_cache_line_size = l1_cache_line_size_detect();
  57
  58         sleepy_penguin_init_kqueue();
  59         sleepy_penguin_init_epoll();
  60         sleepy_penguin_init_timerfd();
  61         sleepy_penguin_init_eventfd();
  62         sleepy_penguin_init_inotify();
  63         sleepy_penguin_init_signalfd();
  64 }