sys/sys/condvar.h

   1 #ifndef _SYS_CONDVAR_H_
   2 #define _SYS_CONDVAR_H_
   3
   4 #include <sys/spinlock.h>
   5
   6 struct lock;
   7
   8 struct cv {
   9         struct spinlock cv_lock;
  10         int             cv_waiters;
  11         const char      *cv_desc;
  12 };
  13
  14 void    cv_init(struct cv *, const char *desc);
  15 void    cv_destroy(struct cv *);
  16
  17 int     _cv_timedwait(struct cv *, struct lock *, int timo, int wakesig);
  18 void    _cv_signal(struct cv *, int broadcast);
  19
  20 int     cv_has_waiters(const struct cv *);
  21
  22 #define cv_wait(cv, lock)                       \
  23                 _cv_timedwait((cv), (lock), 0, 0)
  24 #define cv_wait_sig(cv, lock)                   \
  25                 _cv_timedwait((cv), (lock), 0, 1)
  26 #define cv_timedwait(cv, lock, timeo)           \
  27                 _cv_timedwait((cv), (lock), (timeo), 0)
  28 #define cv_timedwait_sig(cv, lock, timeo)       \
  29                 _cv_timedwait((cv), (lock), (timeo), 1)
  30
  31 #define cv_signal(cv)                           \
  32                 _cv_signal((cv), 0)
  33 #define cv_broadcast(cv)                        \
  34                 _cv_signal((cv), 1)
  35 #define cv_broadcastpri(cv, pri)                \
  36                 cv_broadcast((cv))
  37
  38 #endif  /* _SYS_CONDVAR_H_ */