xref: /freebsd-11.0-release/lib/libthr/thread/thr_private.h

/*
 * Copyright (c) 1995-1998 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 John Birrell.
 * 4. Neither the name of the author nor the names of any co-contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``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 THE AUTHOR OR CONTRIBUTORS 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: head/lib/libthr/thread/thr_private.h 144711 2005-04-06 13:57:31Z davidxu $
 */

#ifndef _THR_PRIVATE_H
#define _THR_PRIVATE_H

/*
 * Include files.
 */
#include <sys/types.h>
#include <sys/time.h>
#include <sys/cdefs.h>
#include <sys/queue.h>
#include <machine/atomic.h>
#include <errno.h>
#include <limits.h>
#include <signal.h>
#include <stddef.h>
#include <stdio.h>
#include <sched.h>
#include <unistd.h>
#include <ucontext.h>
#include <sys/thr.h>
#include <pthread.h>

#include "pthread_md.h"
#include "thr_umtx.h"

/*
 * Evaluate the storage class specifier.
 */
#ifdef GLOBAL_PTHREAD_PRIVATE
#define SCLASS
#define SCLASS_PRESET(x...)	= x
#else
#define SCLASS			extern
#define SCLASS_PRESET(x...)
#endif

/* Signal to do cancellation */
#define	SIGCANCEL		32

/*
 * Kernel fatal error handler macro.
 */
#define PANIC(string)		_thread_exit(__FILE__,__LINE__,string)

/* Output debug messages like this: */
#define stdout_debug(args...)	_thread_printf(STDOUT_FILENO, ##args)
#define stderr_debug(args...)	_thread_printf(STDOUT_FILENO, ##args)

#ifdef _PTHREADS_INVARIANTS
#define THR_ASSERT(cond, msg) do {	\
	if (__predict_false(!(cond)))	\
		PANIC(msg);		\
} while (0)
#else
#define THR_ASSERT(cond, msg)
#endif

#define	TIMESPEC_ADD(dst, src, val)				\
	do { 							\
		(dst)->tv_sec = (src)->tv_sec + (val)->tv_sec;	\
		(dst)->tv_nsec = (src)->tv_nsec + (val)->tv_nsec; \
		if ((dst)->tv_nsec > 1000000000) {		\
			(dst)->tv_sec++;			\
			(dst)->tv_nsec -= 1000000000;		\
		}						\
	} while (0)

#define	TIMESPEC_SUB(dst, src, val)				\
	do { 							\
		(dst)->tv_sec = (src)->tv_sec - (val)->tv_sec;	\
		(dst)->tv_nsec = (src)->tv_nsec - (val)->tv_nsec; \
		if ((dst)->tv_nsec < 0) {			\
			(dst)->tv_sec--;			\
			(dst)->tv_nsec += 1000000000;		\
		}						\
	} while (0)

struct pthread_mutex {
	/*
	 * Lock for accesses to this structure.
	 */
	volatile umtx_t			m_lock;
	enum pthread_mutextype		m_type;
	int				m_protocol;
	TAILQ_HEAD(mutex_head, pthread)	m_queue;
	struct pthread			*m_owner;
	long				m_flags;
	int				m_count;
	int				m_refcount;

	/*
	 * Used for priority inheritence and protection.
	 *
	 *   m_prio       - For priority inheritence, the highest active
	 *                  priority (threads locking the mutex inherit
	 *                  this priority).  For priority protection, the
	 *                  ceiling priority of this mutex.
	 *   m_saved_prio - mutex owners inherited priority before
	 *                  taking the mutex, restored when the owner
	 *                  unlocks the mutex.
	 */
	int				m_prio;
	int				m_saved_prio;

	/*
	 * Link for list of all mutexes a thread currently owns.
	 */
	TAILQ_ENTRY(pthread_mutex)	m_qe;
};

/*
 * Flags for mutexes.
 */
#define MUTEX_FLAGS_PRIVATE	0x01
#define MUTEX_FLAGS_INITED	0x02
#define MUTEX_FLAGS_BUSY	0x04

struct pthread_mutex_attr {
	enum pthread_mutextype	m_type;
	int			m_protocol;
	int			m_ceiling;
	long			m_flags;
};

#define PTHREAD_MUTEXATTR_STATIC_INITIALIZER \
	{ PTHREAD_MUTEX_DEFAULT, PTHREAD_PRIO_NONE, 0, MUTEX_FLAGS_PRIVATE }

struct pthread_cond {
	/*
	 * Lock for accesses to this structure.
	 */
	volatile umtx_t	c_lock;
	volatile umtx_t	c_seqno;
	volatile int	c_waiters;
	volatile int	c_wakeups;
	int		c_pshared;
	int		c_clockid;
};

struct pthread_cond_attr {
	int		c_pshared;
	int		c_clockid;
};

struct pthread_barrier {
	volatile umtx_t	b_lock;
	volatile umtx_t	b_cycle;
	volatile int	b_count;
	volatile int	b_waiters;
};

struct pthread_barrierattr {
	int		pshared;
};

struct pthread_spinlock {
	volatile umtx_t	s_lock;
};

/*
 * Flags for condition variables.
 */
#define COND_FLAGS_PRIVATE	0x01
#define COND_FLAGS_INITED	0x02
#define COND_FLAGS_BUSY		0x04

/*
 * Cleanup definitions.
 */
struct pthread_cleanup {
	struct pthread_cleanup	*next;
	void			(*routine)();
	void			*routine_arg;
	int			onstack;
};

#define	THR_CLEANUP_PUSH(td, func, arg) {		\
	struct pthread_cleanup __cup;			\
							\
	__cup.routine = func;				\
	__cup.routine_arg = arg;			\
	__cup.onstack = 1;				\
	__cup.next = (td)->cleanup;			\
	(td)->cleanup = &__cup;

#define	THR_CLEANUP_POP(td, exec)			\
	(td)->cleanup = __cup.next;			\
	if ((exec) != 0)				\
		__cup.routine(__cup.routine_arg);	\
}

struct pthread_atfork {
	TAILQ_ENTRY(pthread_atfork) qe;
	void (*prepare)(void);
	void (*parent)(void);
	void (*child)(void);
};

struct pthread_attr {
	int	sched_policy;
	int	sched_inherit;
	int	sched_interval;
	int	prio;
	int	suspend;
#define	THR_STACK_USER		0x100	/* 0xFF reserved for <pthread.h> */
	int	flags;
	void	*arg_attr;
	void	(*cleanup_attr)();
	void	*stackaddr_attr;
	size_t	stacksize_attr;
	size_t	guardsize_attr;
};

/*
 * Thread creation state attributes.
 */
#define THR_CREATE_RUNNING		0
#define THR_CREATE_SUSPENDED		1

/*
 * Miscellaneous definitions.
 */
#define THR_STACK_DEFAULT		(sizeof(void *) / 4 * 1024 * 1024)

/*
 * Maximum size of initial thread's stack.  This perhaps deserves to be larger
 * than the stacks of other threads, since many applications are likely to run
 * almost entirely on this stack.
 */
#define THR_STACK_INITIAL		(THR_STACK_DEFAULT * 2)

/*
 * Define the different priority ranges.  All applications have thread
 * priorities constrained within 0-31.  The threads library raises the
 * priority when delivering signals in order to ensure that signal
 * delivery happens (from the POSIX spec) "as soon as possible".
 * In the future, the threads library will also be able to map specific
 * threads into real-time (cooperating) processes or kernel threads.
 * The RT and SIGNAL priorities will be used internally and added to
 * thread base priorities so that the scheduling queue can handle both
 * normal and RT priority threads with and without signal handling.
 *
 * The approach taken is that, within each class, signal delivery
 * always has priority over thread execution.
 */
#define THR_DEFAULT_PRIORITY			15
#define THR_MIN_PRIORITY			0
#define THR_MAX_PRIORITY			31	/* 0x1F */
#define THR_SIGNAL_PRIORITY			32	/* 0x20 */
#define THR_RT_PRIORITY				64	/* 0x40 */
#define THR_FIRST_PRIORITY			THR_MIN_PRIORITY
#define THR_LAST_PRIORITY	\
	(THR_MAX_PRIORITY + THR_SIGNAL_PRIORITY + THR_RT_PRIORITY)
#define THR_BASE_PRIORITY(prio)	((prio) & THR_MAX_PRIORITY)

/*
 * Time slice period in microseconds.
 */
#define TIMESLICE_USEC				20000

struct pthread_rwlockattr {
	int		pshared;
};

struct pthread_rwlock {
	pthread_mutex_t	lock;	/* monitor lock */
	pthread_cond_t	read_signal;
	pthread_cond_t	write_signal;
	int		state;	/* 0 = idle  >0 = # of readers  -1 = writer */
	int		blocked_writers;
};

/*
 * Thread states.
 */
enum pthread_state {
	PS_RUNNING,
	PS_DEAD
};

union pthread_wait_data {
	pthread_mutex_t	mutex;
};

struct pthread_specific_elem {
	const void	*data;
	int		seqno;
};

struct pthread_key {
	volatile int	allocated;
	volatile int	count;
	int		seqno;
	void            (*destructor)(void *);
};

/*
 * Thread structure.
 */
struct pthread {
	/*
	 * Magic value to help recognize a valid thread structure
	 * from an invalid one:
	 */
#define	THR_MAGIC		((u_int32_t) 0xd09ba115)
	u_int32_t		magic;
	char			*name;

	/*
	 * Lock for accesses to this thread structure.
	 */
	umtx_t			lock;

	/* Thread is terminated in kernel, written by kernel. */
	long			terminated;

	/* Kernel thread id. */
	long			tid;

	/* Internal condition variable cycle number. */
	umtx_t			cycle;

	/* How many low level locks the thread held. */
	int			locklevel;

	/* Signal blocked counter. */
	int			sigblock;

	/* Queue entry for list of all threads. */
	TAILQ_ENTRY(pthread)	tle;	/* link for all threads in process */

	/* Queue entry for GC lists. */
	TAILQ_ENTRY(pthread)	gcle;

	/* Hash queue entry. */
	LIST_ENTRY(pthread)	hle;

	/* Threads reference count. */
	int			refcount;

	/*
	 * Thread start routine, argument, stack pointer and thread
	 * attributes.
	 */
	void			*(*start_routine)(void *);
	void			*arg;
	struct pthread_attr	attr;

 	/*
	 * Cancelability flags
	 */
#define	THR_CANCEL_DISABLE		0x0001
#define	THR_CANCEL_EXITING		0x0002
#define THR_CANCEL_AT_POINT		0x0004
#define THR_CANCEL_NEEDED		0x0008
#define	SHOULD_CANCEL(val)					\
	(((val) & (THR_CANCEL_DISABLE | THR_CANCEL_EXITING |	\
		 THR_CANCEL_NEEDED)) == THR_CANCEL_NEEDED)

#define	SHOULD_ASYNC_CANCEL(val)				\
	(((val) & (THR_CANCEL_DISABLE | THR_CANCEL_EXITING |	\
		 THR_CANCEL_NEEDED | THR_CANCEL_AT_POINT)) ==	\
		 (THR_CANCEL_NEEDED | THR_CANCEL_AT_POINT))
	int			cancelflags;

	/* Thread temporary signal mask. */
	sigset_t		sigmask;

	/* Thread state: */
	umtx_t			state;

	/*
	 * Error variable used instead of errno. The function __error()
	 * returns a pointer to this.
	 */
	int			error;

	/*
	 * The joiner is the thread that is joining to this thread.  The
	 * join status keeps track of a join operation to another thread.
	 */
	struct pthread		*joiner;

	/*
	 * The current thread can belong to a priority mutex queue.
	 * This is the synchronization queue link.
	 */
	TAILQ_ENTRY(pthread)	sqe;

	/* Wait data. */
	union pthread_wait_data data;

	int			sflags;
#define THR_FLAGS_IN_SYNCQ	0x0001

	/* Miscellaneous flags; only set with scheduling lock held. */
	int			flags;
#define THR_FLAGS_PRIVATE	0x0001
#define	THR_FLAGS_NEED_SUSPEND	0x0002	/* thread should be suspended */
#define	THR_FLAGS_SUSPENDED	0x0004	/* thread is suspended */

	/* Thread list flags; only set with thread list lock held. */
	int			tlflags;
#define	TLFLAGS_GC_SAFE		0x0001	/* thread safe for cleaning */
#define	TLFLAGS_IN_TDLIST	0x0002	/* thread in all thread list */
#define	TLFLAGS_IN_GCLIST	0x0004	/* thread in gc list */
#define	TLFLAGS_DETACHED	0x0008	/* thread is detached */

	/*
	 * Base priority is the user setable and retrievable priority
	 * of the thread.  It is only affected by explicit calls to
	 * set thread priority and upon thread creation via a thread
	 * attribute or default priority.
	 */
	char			base_priority;

	/*
	 * Inherited priority is the priority a thread inherits by
	 * taking a priority inheritence or protection mutex.  It
	 * is not affected by base priority changes.  Inherited
	 * priority defaults to and remains 0 until a mutex is taken
	 * that is being waited on by any other thread whose priority
	 * is non-zero.
	 */
	char			inherited_priority;

	/*
	 * Active priority is always the maximum of the threads base
	 * priority and inherited priority.  When there is a change
	 * in either the base or inherited priority, the active
	 * priority must be recalculated.
	 */
	char			active_priority;

	/* Number of priority ceiling or protection mutexes owned. */
	int			priority_mutex_count;

	/* Queue of currently owned simple type mutexes. */
	TAILQ_HEAD(, pthread_mutex)	mutexq;

	/* Queue of currently owned priority type mutexs. */
	TAILQ_HEAD(, pthread_mutex)	pri_mutexq;

	void				*ret;
	struct pthread_specific_elem	*specific;
	int				specific_data_count;

	/* Number rwlocks rdlocks held. */
	int			rdlock_count;

	/*
	 * Current locks bitmap for rtld. */
	int			rtld_bits;

	/* Thread control block */
	struct tcb		*tcb;

	/* Cleanup handlers Link List */
	struct pthread_cleanup	*cleanup;
};

#define THR_UMTX_TRYLOCK(thrd, lck)			\
	_thr_umtx_trylock((lck), (thrd)->tid)

#define	THR_UMTX_LOCK(thrd, lck)			\
	_thr_umtx_lock((lck), (thrd)->tid)

#define	THR_UMTX_TIMEDLOCK(thrd, lck, timo)		\
	_thr_umtx_timedlock((lck), (thrd)->tid, (timo))

#define	THR_UMTX_UNLOCK(thrd, lck)			\
	_thr_umtx_unlock((lck), (thrd)->tid)

#define	THR_LOCK_ACQUIRE(thrd, lck)			\
do {							\
	(thrd)->locklevel++;				\
	_thr_umtx_lock(lck, (thrd)->tid);		\
} while (0)

#define	THR_LOCK_RELEASE(thrd, lck)			\
do {							\
	if ((thrd)->locklevel > 0) {			\
		_thr_umtx_unlock((lck), (thrd)->tid);	\
		(thrd)->locklevel--;			\
	} else { 					\
		_thr_assert_lock_level();		\
	}						\
} while (0)

#define	THR_LOCK(curthrd)		THR_LOCK_ACQUIRE(curthrd, &(curthrd)->lock)
#define	THR_UNLOCK(curthrd)		THR_LOCK_RELEASE(curthrd, &(curthrd)->lock)
#define	THR_THREAD_LOCK(curthrd, thr)	THR_LOCK_ACQUIRE(curthrd, &(thr)->lock)
#define	THR_THREAD_UNLOCK(curthrd, thr)	THR_LOCK_RELEASE(curthrd, &(thr)->lock)

#define	THREAD_LIST_LOCK(curthrd)				\
do {								\
	THR_LOCK_ACQUIRE((curthrd), &_thr_list_lock);		\
} while (0)

#define	THREAD_LIST_UNLOCK(curthrd)				\
do {								\
	THR_LOCK_RELEASE((curthrd), &_thr_list_lock);		\
} while (0)

/*
 * Macros to insert/remove threads to the all thread list and
 * the gc list.
 */
#define	THR_LIST_ADD(thrd) do {					\
	if (((thrd)->tlflags & TLFLAGS_IN_TDLIST) == 0) {	\
		TAILQ_INSERT_HEAD(&_thread_list, thrd, tle);	\
		_thr_hash_add(thrd);				\
		(thrd)->tlflags |= TLFLAGS_IN_TDLIST;		\
	}							\
} while (0)
#define	THR_LIST_REMOVE(thrd) do {				\
	if (((thrd)->tlflags & TLFLAGS_IN_TDLIST) != 0) {	\
		TAILQ_REMOVE(&_thread_list, thrd, tle);		\
		_thr_hash_remove(thrd);				\
		(thrd)->tlflags &= ~TLFLAGS_IN_TDLIST;		\
	}							\
} while (0)
#define	THR_GCLIST_ADD(thrd) do {				\
	if (((thrd)->tlflags & TLFLAGS_IN_GCLIST) == 0) {	\
		TAILQ_INSERT_HEAD(&_thread_gc_list, thrd, gcle);\
		(thrd)->tlflags |= TLFLAGS_IN_GCLIST;		\
		_gc_count++;					\
	}							\
} while (0)
#define	THR_GCLIST_REMOVE(thrd) do {				\
	if (((thrd)->tlflags & TLFLAGS_IN_GCLIST) != 0) {	\
		TAILQ_REMOVE(&_thread_gc_list, thrd, gcle);	\
		(thrd)->tlflags &= ~TLFLAGS_IN_GCLIST;		\
		_gc_count--;					\
	}							\
} while (0)

#define GC_NEEDED()	(_gc_count >= 5)

#define	THR_IN_SYNCQ(thrd)	(((thrd)->sflags & THR_FLAGS_IN_SYNCQ) != 0)

extern int __isthreaded;

/*
 * Global variables for the pthread kernel.
 */

SCLASS void		*_usrstack	SCLASS_PRESET(NULL);
SCLASS struct pthread	*_thr_initial	SCLASS_PRESET(NULL);
/* For debugger */
SCLASS int		_libthr_debug		SCLASS_PRESET(0);
SCLASS int		_thr_scope_system	SCLASS_PRESET(0);

/* List of all threads: */
SCLASS TAILQ_HEAD(, pthread)	_thread_list
    SCLASS_PRESET(TAILQ_HEAD_INITIALIZER(_thread_list));

/* List of threads needing GC: */
SCLASS TAILQ_HEAD(, pthread)	_thread_gc_list
    SCLASS_PRESET(TAILQ_HEAD_INITIALIZER(_thread_gc_list));

SCLASS int	_thread_active_threads  SCLASS_PRESET(1);

SCLASS TAILQ_HEAD(atfork_head, pthread_atfork) _thr_atfork_list;
SCLASS umtx_t	_thr_atfork_lock;

/* Default thread attributes: */
SCLASS struct pthread_attr _pthread_attr_default
    SCLASS_PRESET({
	.sched_policy = SCHED_RR,
	.sched_inherit = 0,
	.sched_interval = TIMESLICE_USEC,
	.prio = THR_DEFAULT_PRIORITY,
	.suspend = THR_CREATE_RUNNING,
	.flags = 0,
	.arg_attr = NULL,
	.cleanup_attr = NULL,
	.stackaddr_attr = NULL,
	.stacksize_attr = THR_STACK_DEFAULT,
	.guardsize_attr = 0
    });

/* Default mutex attributes: */
SCLASS struct pthread_mutex_attr _pthread_mutexattr_default
    SCLASS_PRESET({
	.m_type = PTHREAD_MUTEX_DEFAULT,
	.m_protocol = PTHREAD_PRIO_NONE,
	.m_ceiling = 0,
	.m_flags = 0
    });

/* Default condition variable attributes: */
SCLASS struct pthread_cond_attr _pthread_condattr_default
    SCLASS_PRESET({
	.c_pshared = PTHREAD_PROCESS_PRIVATE,
	.c_clockid = CLOCK_REALTIME
    });

SCLASS pid_t		_thr_pid		SCLASS_PRESET(0);
SCLASS int		_thr_guard_default;
SCLASS int		_thr_stack_default	SCLASS_PRESET(THR_STACK_DEFAULT);
SCLASS int		_thr_stack_initial	SCLASS_PRESET(THR_STACK_INITIAL);
SCLASS int		_thr_page_size;
/* Garbage thread count. */
SCLASS int              _gc_count               SCLASS_PRESET(0);

SCLASS umtx_t		_mutex_static_lock;
SCLASS umtx_t		_cond_static_lock;
SCLASS umtx_t		_rwlock_static_lock;
SCLASS umtx_t		_keytable_lock;
SCLASS umtx_t		_thr_list_lock;

/* Undefine the storage class and preset specifiers: */
#undef  SCLASS
#undef	SCLASS_PRESET

/*
 * Function prototype definitions.
 */
__BEGIN_DECLS
int	_thr_setthreaded(int);
int	_mutex_cv_lock(pthread_mutex_t *);
int	_mutex_cv_unlock(pthread_mutex_t *);
void	_mutex_notify_priochange(struct pthread *, struct pthread *, int);
int	_mutex_reinit(pthread_mutex_t *);
void	_mutex_fork(struct pthread *curthread);
void	_mutex_unlock_private(struct pthread *);
void	_libpthread_init(struct pthread *);
void	*_pthread_getspecific(pthread_key_t);
int	_pthread_cond_init(pthread_cond_t *, const pthread_condattr_t *);
int	_pthread_cond_destroy(pthread_cond_t *);
int	_pthread_cond_wait(pthread_cond_t *, pthread_mutex_t *);
int	_pthread_cond_timedwait(pthread_cond_t *, pthread_mutex_t *,
	    const struct timespec *);
int	_pthread_cond_signal(pthread_cond_t *);
int	_pthread_cond_broadcast(pthread_cond_t *);
int	_pthread_create(pthread_t * thread, const pthread_attr_t * attr,
	    void *(*start_routine) (void *), void *arg);
int	_pthread_key_create(pthread_key_t *, void (*) (void *));
int	_pthread_key_delete(pthread_key_t);
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_trylock(pthread_mutex_t *);
int	_pthread_mutex_unlock(pthread_mutex_t *);
int	_pthread_mutexattr_init(pthread_mutexattr_t *);
int	_pthread_mutexattr_destroy(pthread_mutexattr_t *);
int	_pthread_mutexattr_settype(pthread_mutexattr_t *, int);
int	_pthread_once(pthread_once_t *, void (*) (void));
int	_pthread_rwlock_init(pthread_rwlock_t *, const pthread_rwlockattr_t *);
int	_pthread_rwlock_destroy (pthread_rwlock_t *);
struct pthread *_pthread_self(void);
int	_pthread_setspecific(pthread_key_t, const void *);
void	_pthread_testcancel(void);
void	_pthread_yield(void);
void	_pthread_cleanup_push(void (*routine) (void *), void *routine_arg);
void	_pthread_cleanup_pop(int execute);
struct pthread *_thr_alloc(struct pthread *);
void	_thread_exit(char *, int, char *) __dead2;
void	_thr_exit_cleanup(void);
int	_thr_ref_add(struct pthread *, struct pthread *, int);
void	_thr_ref_delete(struct pthread *, struct pthread *);
int	_thr_find_thread(struct pthread *, struct pthread *, int);
void	_thr_rtld_init(void);
void	_thr_rtld_fini(void);
int	_thr_stack_alloc(struct pthread_attr *);
void	_thr_stack_free(struct pthread_attr *);
void	_thr_free(struct pthread *, struct pthread *);
void	_thr_gc(struct pthread *);
void    _thread_cleanupspecific(void);
void    _thread_dump_info(void);
void	_thread_printf(int, const char *, ...);
void	_thr_spinlock_init(void);
int	_thr_cancel_enter(struct pthread *);
void	_thr_cancel_leave(struct pthread *, int);
void	_thr_signal_block(struct pthread *);
void	_thr_signal_unblock(struct pthread *);
void	_thr_signal_init(void);
void	_thr_signal_deinit(void);
int	_thr_send_sig(struct pthread *, int sig);
void	_thr_list_init();
void	_thr_hash_add(struct pthread *);
void	_thr_hash_remove(struct pthread *);
struct pthread *_thr_hash_find(struct pthread *);
void	_thr_link(struct pthread *curthread, struct pthread *thread);
void	_thr_unlink(struct pthread *curthread, struct pthread *thread);
void	_thr_suspend_check(struct pthread *curthread);
void	_thr_assert_lock_level() __dead2;

/* #include <sys/aio.h> */
#ifdef _SYS_AIO_H_
int	__sys_aio_suspend(const struct aiocb * const[], int, const struct timespec *);
#endif

/* #include <fcntl.h> */
#ifdef  _SYS_FCNTL_H_
int     __sys_fcntl(int, int, ...);
int     __sys_open(const char *, int, ...);
#endif

/* #include <sys/ioctl.h> */
#ifdef _SYS_IOCTL_H_
int	__sys_ioctl(int, unsigned long, ...);
#endif

/* #inclde <sched.h> */
#ifdef	_SCHED_H_
int	__sys_sched_yield(void);
#endif

/* #include <signal.h> */
#ifdef _SIGNAL_H_
int	__sys_kill(pid_t, int);
int     __sys_sigaction(int, const struct sigaction *, struct sigaction *);
int     __sys_sigpending(sigset_t *);
int     __sys_sigprocmask(int, const sigset_t *, sigset_t *);
int     __sys_sigsuspend(const sigset_t *);
int     __sys_sigreturn(ucontext_t *);
int     __sys_sigaltstack(const struct sigaltstack *, struct sigaltstack *);
#endif

/* #include <sys/socket.h> */
#ifdef _SYS_SOCKET_H_
int	__sys_accept(int, struct sockaddr *, socklen_t *);
int	__sys_connect(int, const struct sockaddr *, socklen_t);
ssize_t __sys_recv(int, void *, size_t, int);
ssize_t __sys_recvfrom(int, void *, size_t, int, struct sockaddr *, socklen_t *);
ssize_t __sys_recvmsg(int, struct msghdr *, int);
int	__sys_sendfile(int, int, off_t, size_t, struct sf_hdtr *,
	    off_t *, int);
ssize_t __sys_sendmsg(int, const struct msghdr *, int);
ssize_t __sys_sendto(int, const void *,size_t, int, const struct sockaddr *, socklen_t);
#endif

/* #include <sys/uio.h> */
#ifdef  _SYS_UIO_H_
ssize_t __sys_readv(int, const struct iovec *, int);
ssize_t __sys_writev(int, const struct iovec *, int);
#endif

/* #include <time.h> */
#ifdef	_TIME_H_
int	__sys_nanosleep(const struct timespec *, struct timespec *);
#endif

/* #include <unistd.h> */
#ifdef  _UNISTD_H_
int     __sys_close(int);
int     __sys_execve(const char *, char * const *, char * const *);
int	__sys_fork(void);
int	__sys_fsync(int);
pid_t	__sys_getpid(void);
int     __sys_select(int, fd_set *, fd_set *, fd_set *, struct timeval *);
ssize_t __sys_read(int, void *, size_t);
ssize_t __sys_write(int, const void *, size_t);
void	__sys_exit(int);
int	__sys_sigwait(const sigset_t *, int *);
int	__sys_sigtimedwait(const sigset_t *, siginfo_t *,
		const struct timespec *);
int	__sys_sigwaitinfo(const sigset_t *set, siginfo_t *info);
#endif

/* #include <poll.h> */
#ifdef _SYS_POLL_H_
int 	__sys_poll(struct pollfd *, unsigned, int);
#endif

/* #include <sys/mman.h> */
#ifdef _SYS_MMAN_H_
int	__sys_msync(void *, size_t, int);
#endif

static inline int
_thr_isthreaded(void)
{
	return (__isthreaded != 0);
}

static inline int
_thr_is_inited(void)
{
	return (_thr_initial != NULL);
}

static inline void
_thr_check_init(void)
{
	if (_thr_initial == NULL)
		_libpthread_init(NULL);
}

__END_DECLS

#endif  /* !_THR_PRIVATE_H */