IABSD.fr/src/lib/librthread/rthread.h

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• Author : mpi
  Date : 2019-02-13 13:22:14
  Hash : 5ecdd056
  Message : New futex(2) based rwlock implementation based on the mutex code. This implementation reduces contention because threads no longer need to spin calling sched_yield(2) before going to sleep. Tested by many, thanks! ok visa@, pirofti@

• lib/librthread/rthread.h

• /*	$OpenBSD: rthread.h,v 1.64 2019/02/13 13:22:14 mpi Exp $ */
  /*
   * Copyright (c) 2004,2005 Ted Unangst <tedu@openbsd.org>
   * All Rights Reserved.
   *
   * Permission to use, copy, modify, and distribute this software for any
   * purpose with or without fee is hereby granted, provided that the above
   * copyright notice and this permission notice appear in all copies.
   *
   * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
   * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
   * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
   * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
   */
  /*
   * Private data structures that back up the typedefs in pthread.h.
   * Since only the thread library cares about their size or arrangement,
   * it should be possible to switch libraries without relinking.
   *
   * Do not reorder _atomic_lock_t and sem_t variables in the structs.
   * This is due to alignment requirements of certain arches like hppa.
   * The current requirement is 16 bytes.
   *
   * THE MACHINE DEPENDENT CERROR CODE HAS HARD CODED OFFSETS INTO PTHREAD_T!
   */
  
  #ifndef _RTHREAD_H_
  #define _RTHREAD_H_
  
  #include <semaphore.h>
  #include "thread_private.h"
  
  #ifdef __LP64__
  #define RTHREAD_STACK_SIZE_DEF (512 * 1024)
  #else
  #define RTHREAD_STACK_SIZE_DEF (256 * 1024)
  #endif
  
  struct stack {
  	SLIST_ENTRY(stack)	link;	/* link for free default stacks */
  	void	*sp;			/* machine stack pointer */
  	void	*base;			/* bottom of allocated area */
  	size_t	guardsize;		/* size of PROT_NONE zone or */
  					/* ==1 if application alloced */
  	size_t	len;			/* total size of allocated stack */
  };
  
  #define	PTHREAD_MIN_PRIORITY	0
  #define	PTHREAD_MAX_PRIORITY	31
  
  
  struct pthread_rwlockattr {
  	int pshared;
  };
  
  struct pthread_barrier {
  	pthread_mutex_t mutex;
  	pthread_cond_t cond;
  	int threshold;
  	int in;
  	int out;
  	int generation;
  };
  
  struct pthread_barrierattr {
  	int pshared;
  };
  
  struct pthread_spinlock {
  	_atomic_lock_t lock;
  	pthread_t owner;
  };
  
  
  #define	ROUND_TO_PAGE(size) \
  	(((size) + (_thread_pagesize - 1)) & ~(_thread_pagesize - 1))
  
  __BEGIN_HIDDEN_DECLS
  int	_sem_wait(sem_t, int, const struct timespec *, int *);
  int	_sem_post(sem_t);
  
  void	_rthread_init(void);
  struct stack *_rthread_alloc_stack(pthread_t);
  void	_rthread_free_stack(struct stack *);
  #ifndef NO_PIC
  void	_rthread_dl_lock(int what);
  #endif
  
  extern int _threads_ready;
  extern size_t _thread_pagesize;
  extern LIST_HEAD(listhead, pthread) _thread_list;
  extern _atomic_lock_t _thread_lock;
  extern struct pthread_attr _rthread_attr_default;
  __END_HIDDEN_DECLS
  
  void	_thread_dump_info(void);
  
  #define REDIRECT_SYSCALL(x)		typeof(x) x asm("_thread_sys_"#x)
  
  #endif /* _RTHREAD_H_ */