arch/unix/include/lock.h

   1 #ifndef _ARCH_LOCK_H_
   2 #define _ARCH_LOCK_H_
   3
   4 #include <signal.h>
   5 #include <stdlib.h>
   6
   7 typedef sigset_t lock_state_t;
   8
   9 struct lock {
  10         lock_state_t lock_state;
  11 };
  12
  13 #define LOCK_INIT (struct lock) {}
  14
  15 static inline void lock_init(struct lock *lock)
  16 {
  17 }
  18
  19 static inline void lock(struct lock *lock)
  20 {
  21         sigset_t sigs;
  22         sigemptyset(&sigs);
  23         sigaddset(&sigs, SIGALRM);
  24         sigprocmask(SIG_BLOCK, &sigs, &lock->lock_state);
  25 }
  26
  27 static inline void unlock(struct lock *lock)
  28 {
  29         sigprocmask(SIG_SETMASK, &lock->lock_state, NULL);
  30 }
  31
  32 #endif