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#define _MAX_PAGE_SHIFT in MD _types.h as the maximum pagesize an arch
needs (looking at you sgi, but others required this before).  This is for
the circumstances we need pagesize known at compile time, not getpagesize()
runtime. Use it for malloc storage sizes, for shm, and to set pthread stack
default sizes.  The stack sizes were a mess, and pushing them towards
page-aligned is healthy move (which will also be needed by the coming
stack register checker)
ok guenther kettenis, discussion with stefan

/*	$OpenBSD: pthread.h,v 1.4 2018/03/05 01:15:26 deraadt Exp $	*/

/*
 * Copyright (c) 1993, 1994 by Chris Provenzano, proven@mit.edu
 * Copyright (c) 1995-1998 by John Birrell <jb@cimlogic.com.au>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *  This product includes software developed by Chris Provenzano.
 * 4. The name of Chris Provenzano may not be used to endorse or promote 
 *	  products derived from this software without specific prior written
 *	  permission.
 *
 * THIS SOFTWARE IS PROVIDED BY CHRIS PROVENZANO ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL CHRIS PROVENZANO BE LIABLE FOR ANY 
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 
 * SUCH DAMAGE.
 *
 * $FreeBSD: pthread.h,v 1.13 1999/07/31 08:36:07 rse Exp $
 */
#ifndef _PTHREAD_H_
#define _PTHREAD_H_

/*
 * Header files.
 */
#include <sys/types.h>
#include <sys/time.h>
#include <sys/signal.h>
#include <limits.h>
#include <sched.h>

/*
 * Run-time invariant values:
 */
#define PTHREAD_DESTRUCTOR_ITERATIONS		4
#define PTHREAD_KEYS_MAX			256
#define PTHREAD_STACK_MIN			(1U << _MAX_PAGE_SHIFT)
#define PTHREAD_THREADS_MAX			ULONG_MAX

/*
 * Flags for threads and thread attributes.
 */
#define PTHREAD_DETACHED            0x1
#define PTHREAD_SCOPE_SYSTEM        0x2
#define PTHREAD_INHERIT_SCHED       0x4
#define PTHREAD_NOFLOAT             0x8

#define PTHREAD_CREATE_DETACHED     PTHREAD_DETACHED
#define PTHREAD_CREATE_JOINABLE     0
#define PTHREAD_SCOPE_PROCESS       0
#define PTHREAD_EXPLICIT_SCHED      0

/*
 * Flags for read/write lock attributes
 */
#define PTHREAD_PROCESS_PRIVATE     0
#define PTHREAD_PROCESS_SHARED      1	

/*
 * Flags for cancelling threads
 */
#define PTHREAD_CANCEL_ENABLE		0
#define PTHREAD_CANCEL_DISABLE		1
#define PTHREAD_CANCEL_DEFERRED		0
#define PTHREAD_CANCEL_ASYNCHRONOUS	2
#define PTHREAD_CANCELED		((void *) 1)

/*
 * Barrier flags
 */
#define PTHREAD_BARRIER_SERIAL_THREAD -1

/*
 * Forward structure definitions.
 *
 * These are mostly opaque to the user.
 */
struct pthread;
struct pthread_attr;
struct pthread_cond;
struct pthread_cond_attr;
struct pthread_mutex;
struct pthread_mutex_attr;
struct pthread_once;
struct pthread_rwlock;
struct pthread_rwlockattr;

/*
 * Primitive system data type definitions required by P1003.1c.
 *
 * Note that P1003.1c specifies that there are no defined comparison
 * or assignment operators for the types pthread_attr_t, pthread_cond_t,
 * pthread_condattr_t, pthread_mutex_t, pthread_mutexattr_t.
 */
typedef struct	pthread			*pthread_t;
typedef struct	pthread_attr		*pthread_attr_t;
typedef volatile struct pthread_mutex	*pthread_mutex_t;
typedef struct	pthread_mutex_attr	*pthread_mutexattr_t;
typedef struct	pthread_cond		*pthread_cond_t;
typedef struct	pthread_cond_attr	*pthread_condattr_t;
typedef int				pthread_key_t;
typedef struct	pthread_once		pthread_once_t;
typedef struct	pthread_rwlock		*pthread_rwlock_t;
typedef struct	pthread_rwlockattr	*pthread_rwlockattr_t;
typedef struct	pthread_barrier		*pthread_barrier_t;
typedef struct	pthread_barrierattr	*pthread_barrierattr_t;
typedef struct	pthread_spinlock	*pthread_spinlock_t;

/*
 * Additional type definitions:
 *
 * Note that P1003.1c reserves the prefixes pthread_ and PTHREAD_ for
 * use in header symbols.
 */
typedef void	*pthread_addr_t;
typedef void	*(*pthread_startroutine_t)(void *);

/*
 * Once definitions.
 */
struct pthread_once {
	int		state;
	pthread_mutex_t	mutex;
};

/*
 * Flags for once initialization.
 */
#define PTHREAD_NEEDS_INIT  0
#define PTHREAD_DONE_INIT   1

/*
 * Static once initialization values. 
 */
#define PTHREAD_ONCE_INIT   { PTHREAD_NEEDS_INIT, PTHREAD_MUTEX_INITIALIZER }

/*
 * Static initialization values. 
 */
#define PTHREAD_MUTEX_INITIALIZER	NULL
#define PTHREAD_COND_INITIALIZER	NULL
#define PTHREAD_RWLOCK_INITIALIZER	NULL

#define PTHREAD_PRIO_NONE	0
#define PTHREAD_PRIO_INHERIT	1
#define PTHREAD_PRIO_PROTECT	2

/*
 * Mutex types.
 */
enum pthread_mutextype {
	PTHREAD_MUTEX_ERRORCHECK	= 1,	/* Error checking mutex */
	PTHREAD_MUTEX_RECURSIVE		= 2,	/* Recursive mutex */
	PTHREAD_MUTEX_NORMAL		= 3,	/* No error checking */
	PTHREAD_MUTEX_STRICT_NP		= 4,	/* Strict error checking */
	PTHREAD_MUTEX_TYPE_MAX
};

#define PTHREAD_MUTEX_ERRORCHECK	PTHREAD_MUTEX_ERRORCHECK
#define PTHREAD_MUTEX_RECURSIVE		PTHREAD_MUTEX_RECURSIVE
#define PTHREAD_MUTEX_NORMAL		PTHREAD_MUTEX_NORMAL
#define PTHREAD_MUTEX_STRICT_NP		PTHREAD_MUTEX_STRICT_NP
#define PTHREAD_MUTEX_DEFAULT		PTHREAD_MUTEX_STRICT_NP

/*
 * Thread function prototype definitions:
 */
__BEGIN_DECLS
int		pthread_atfork(void (*)(void), void (*)(void), void (*)(void));
int		pthread_attr_destroy(pthread_attr_t *);
int		pthread_attr_getstack(const pthread_attr_t *,
			void **, size_t *);
int		pthread_attr_getstacksize(const pthread_attr_t *, size_t *);
int		pthread_attr_getstackaddr(const pthread_attr_t *, void **);
int		pthread_attr_getguardsize(const pthread_attr_t *, size_t *);
int		pthread_attr_getdetachstate(const pthread_attr_t *, int *);
int		pthread_attr_init(pthread_attr_t *);
int		pthread_attr_setstacksize(pthread_attr_t *, size_t);
int		pthread_attr_setstack(pthread_attr_t *, void *, size_t);
int		pthread_attr_setstackaddr(pthread_attr_t *, void *);
int		pthread_attr_setguardsize(pthread_attr_t *, size_t);
int		pthread_attr_setdetachstate(pthread_attr_t *, int);
void		pthread_cleanup_pop(int);
void		pthread_cleanup_push(void (*) (void *), void *routine_arg);
int		pthread_condattr_destroy(pthread_condattr_t *);
int		pthread_condattr_init(pthread_condattr_t *);

int		pthread_cond_broadcast(pthread_cond_t *);
int		pthread_cond_destroy(pthread_cond_t *);
int		pthread_cond_init(pthread_cond_t *,
			const pthread_condattr_t *);
int		pthread_cond_signal(pthread_cond_t *);
int		pthread_cond_timedwait(pthread_cond_t *,
			pthread_mutex_t *, const struct timespec *);
int		pthread_cond_wait(pthread_cond_t *, pthread_mutex_t *);
int		pthread_create(pthread_t *, const pthread_attr_t *,
			void *(*) (void *), void *);
int		pthread_detach(pthread_t);
int		pthread_equal(pthread_t, pthread_t);
__dead void	pthread_exit(void *);
void		*pthread_getspecific(pthread_key_t);
int		pthread_join(pthread_t, void **);
int		pthread_key_create(pthread_key_t *,
			void (*) (void *));
int		pthread_key_delete(pthread_key_t);
int		pthread_kill(pthread_t, int);
int		pthread_mutexattr_init(pthread_mutexattr_t *);
int		pthread_mutexattr_destroy(pthread_mutexattr_t *);
int		pthread_mutexattr_gettype(pthread_mutexattr_t *, int *);
int		pthread_mutexattr_settype(pthread_mutexattr_t *, int);
int		pthread_mutex_destroy(pthread_mutex_t *);
int		pthread_mutex_init(pthread_mutex_t *,
			const pthread_mutexattr_t *);
int		pthread_mutex_lock(pthread_mutex_t *);
int		pthread_mutex_timedlock(pthread_mutex_t *,
		    const struct timespec *);
int		pthread_mutex_trylock(pthread_mutex_t *);
int		pthread_mutex_unlock(pthread_mutex_t *);
int		pthread_once(pthread_once_t *, void (*) (void));
int		pthread_rwlock_destroy(pthread_rwlock_t *);
int		pthread_rwlock_init(pthread_rwlock_t *,
			const pthread_rwlockattr_t *);
int		pthread_rwlock_rdlock(pthread_rwlock_t *);
int		pthread_rwlock_timedrdlock(pthread_rwlock_t *,
			const struct timespec *);
int		pthread_rwlock_timedwrlock(pthread_rwlock_t *,
			const struct timespec *);
int		pthread_rwlock_tryrdlock(pthread_rwlock_t *);
int		pthread_rwlock_trywrlock(pthread_rwlock_t *);
int		pthread_rwlock_unlock(pthread_rwlock_t *);
int		pthread_rwlock_wrlock(pthread_rwlock_t *);
int		pthread_rwlockattr_init(pthread_rwlockattr_t *);
int		pthread_rwlockattr_getpshared(const pthread_rwlockattr_t *,
			int *);
int		pthread_rwlockattr_setpshared(pthread_rwlockattr_t *, int);
int		pthread_rwlockattr_destroy(pthread_rwlockattr_t *);
pthread_t	pthread_self(void);
int		pthread_setspecific(pthread_key_t, const void *);

int		pthread_cancel(pthread_t);
int		pthread_setcancelstate(int, int *);
int		pthread_setcanceltype(int, int *);
void		pthread_testcancel(void);

int		pthread_getprio(pthread_t);
int		pthread_setprio(pthread_t, int);
void		pthread_yield(void);

int		pthread_mutexattr_getprioceiling(pthread_mutexattr_t *,
			int *);
int		pthread_mutexattr_setprioceiling(pthread_mutexattr_t *,
			int);
int		pthread_mutex_getprioceiling(pthread_mutex_t *, int *);
int		pthread_mutex_setprioceiling(pthread_mutex_t *, int, int *);

int		pthread_mutexattr_getprotocol(pthread_mutexattr_t *, int *);
int		pthread_mutexattr_setprotocol(pthread_mutexattr_t *, int);

int		pthread_condattr_getclock(const pthread_condattr_t *,
		    clockid_t *);
int		pthread_condattr_setclock(pthread_condattr_t *, clockid_t);

int		pthread_attr_getinheritsched(const pthread_attr_t *, int *);
int		pthread_attr_getschedparam(const pthread_attr_t *,
			struct sched_param *);
int		pthread_attr_getschedpolicy(const pthread_attr_t *, int *);
int		pthread_attr_getscope(const pthread_attr_t *, int *);
int		pthread_attr_setinheritsched(pthread_attr_t *, int);
int		pthread_attr_setschedparam(pthread_attr_t *,
			const struct sched_param *);
int		pthread_attr_setschedpolicy(pthread_attr_t *, int);
int		pthread_attr_setscope(pthread_attr_t *, int);
int		pthread_getschedparam(pthread_t pthread, int *,
			struct sched_param *);
int		pthread_setschedparam(pthread_t, int,
			const struct sched_param *);
int		pthread_getconcurrency(void);
int		pthread_setconcurrency(int);
int		pthread_barrier_init(pthread_barrier_t *,
		    pthread_barrierattr_t *, unsigned int);
int		pthread_barrier_destroy(pthread_barrier_t *);
int		pthread_barrier_wait(pthread_barrier_t *);
int		pthread_barrierattr_init(pthread_barrierattr_t *);
int		pthread_barrierattr_destroy(pthread_barrierattr_t *);
int		pthread_barrierattr_getpshared(pthread_barrierattr_t *, int *);
int		pthread_barrierattr_setpshared(pthread_barrierattr_t *, int);
int		pthread_spin_init(pthread_spinlock_t *, int);
int		pthread_spin_destroy(pthread_spinlock_t *);
int		pthread_spin_trylock(pthread_spinlock_t *);
int		pthread_spin_lock(pthread_spinlock_t *);
int		pthread_spin_unlock(pthread_spinlock_t *);

#if __POSIX_VISIBLE >= 200112
int		pthread_getcpuclockid(pthread_t, clockid_t *);
#endif
__END_DECLS

#endif /* _PTHREAD_H_ */