text: 
  /*
   * Copyright (C) Igor Sysoev
   * Copyright (C) NGINX, Inc.
   */
  
  #ifndef _NXT_UNIX_SEMAPHORE_H_INCLUDED_
  #define _NXT_UNIX_SEMAPHORE_H_INCLUDED_
  
  
  #if (NXT_HAVE_SEM_TIMEDWAIT)
  
  typedef sem_t           nxt_sem_t;
  
  #else
  
  typedef struct {
      nxt_atomic_t        count;
      nxt_thread_mutex_t  mutex;
      nxt_thread_cond_t   cond;
  } nxt_sem_t;
  
  #endif
  
  
  NXT_EXPORT nxt_int_t nxt_sem_init(nxt_sem_t *sem, nxt_uint_t count);
  NXT_EXPORT void nxt_sem_destroy(nxt_sem_t *sem);
  NXT_EXPORT nxt_int_t nxt_sem_post(nxt_sem_t *sem);
  NXT_EXPORT nxt_err_t nxt_sem_wait(nxt_sem_t *sem, nxt_nsec_t timeout);
  
  
  #endif /* _NXT_UNIX_SEMAPHORE_H_INCLUDED_ */
  