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freebsd-nq/lib/libthr/thread/thr_private.h
Mike Makonnen b9662ddd18 Teach recent changes in the umtx structure in the kernel to the libthr 
initialiazer.

Found by:	tinderbox
2003-06-03 09:31:33 +00:00

877 lines
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/*
* 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.
*
* Private thread definitions for the uthread kernel.
*
* $FreeBSD$
*/
#ifndef _THR_PRIVATE_H
#define _THR_PRIVATE_H
/*
* Evaluate the storage class specifier.
*/
#ifdef GLOBAL_PTHREAD_PRIVATE
#define SCLASS
#else
#define SCLASS extern
#endif
/*
* Include files.
*/
#include <sys/types.h>
#include <sys/cdefs.h>
#include <sys/errno.h>
#include <sys/time.h>
#include <sys/queue.h>
#include <pthread_np.h>
#include <sched.h>
#include <signal.h>
#include <spinlock.h>
#include <stdio.h>
#include <ucontext.h>
#include <machine/atomic.h>
#include <sys/thr.h>
#include <sys/umtx.h>
/*
* 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)
/*
* Currently executing thread.
*/
#define curthread _get_curthread()
/*
* State change macro without scheduling queue change:
*/
#define PTHREAD_SET_STATE(thrd, newstate) do { \
(thrd)->state = newstate; \
(thrd)->fname = __FILE__; \
(thrd)->lineno = __LINE__; \
} while (0)
/*
* State change macro with scheduling queue change - This must be
* called with GIANT held.
*/
#if defined(_PTHREADS_INVARIANTS)
#include <assert.h>
#define PTHREAD_ASSERT(cond, msg) do { \
if (!(cond)) \
PANIC(msg); \
} while (0)
#define PTHREAD_ASSERT_NOT_IN_SYNCQ(thrd) \
PTHREAD_ASSERT((((thrd)->flags & PTHREAD_FLAGS_IN_SYNCQ) == 0), \
"Illegal call from signal handler");
#define PTHREAD_NEW_STATE(thrd, newstate) do { \
if ((thrd)->state != newstate) { \
if ((thrd)->state == PS_RUNNING) { \
PTHREAD_SET_STATE(thrd, newstate); \
} else if (newstate == PS_RUNNING) { \
if (thr_kill(thrd->thr_id, SIGTHR)) \
abort(); \
PTHREAD_SET_STATE(thrd, newstate); \
} \
} \
} while (0)
#else
#define PTHREAD_ASSERT(cond, msg)
#define PTHREAD_ASSERT_NOT_IN_SYNCQ(thrd)
#define PTHREAD_NEW_STATE(thrd, newstate) do { \
if (thr_kill(thrd->thr_id, SIGTHR)) \
abort(); \
PTHREAD_SET_STATE(thrd, newstate); \
} while (0)
#if 0
#define PTHREAD_NEW_STATE(thrd, newstate) do { \
if ((thrd)->state != newstate) { \
if ((thrd)->state == PS_RUNNING) { \
} else if (newstate == PS_RUNNING) { \
if (thr_kill(thrd->thr_id, SIGTHR)) \
abort(); \
} \
} \
PTHREAD_SET_STATE(thrd, newstate); \
} while (0)
#endif
#endif
/*
* TailQ initialization values.
*/
#define TAILQ_INITIALIZER { NULL, NULL }
#define UMTX_INITIALIZER { NULL }
struct pthread_mutex_attr {
enum pthread_mutextype m_type;
int m_protocol;
int m_ceiling;
long m_flags;
};
/*
* Static mutex initialization values.
*/
#define PTHREAD_MUTEXATTR_STATIC_INITIALIZER \
{ PTHREAD_MUTEX_DEFAULT, PTHREAD_PRIO_NONE, 0, MUTEX_FLAGS_PRIVATE }
#define PTHREAD_MUTEX_STATIC_INITIALIZER \
{ PTHREAD_MUTEXATTR_STATIC_INITIALIZER, UMTX_INITIALIZER, NULL, \
0, 0, TAILQ_INITIALIZER }
union pthread_mutex_data {
void *m_ptr;
int m_count;
};
struct pthread_mutex {
enum pthread_mutextype m_type;
int m_protocol;
TAILQ_HEAD(mutex_head, pthread) m_queue;
struct pthread *m_owner;
union pthread_mutex_data m_data;
long m_flags;
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;
/*
* Lock for accesses to this structure.
*/
spinlock_t lock;
};
/*
* Flags for mutexes.
*/
#define MUTEX_FLAGS_PRIVATE 0x01
#define MUTEX_FLAGS_INITED 0x02
#define MUTEX_FLAGS_BUSY 0x04
/*
* Condition variable definitions.
*/
enum pthread_cond_type {
COND_TYPE_FAST,
COND_TYPE_MAX
};
struct pthread_cond {
enum pthread_cond_type c_type;
TAILQ_HEAD(cond_head, pthread) c_queue;
pthread_mutex_t c_mutex;
void *c_data;
long c_flags;
int c_seqno;
/*
* Lock for accesses to this structure.
*/
struct umtx c_lock;
};
struct pthread_cond_attr {
enum pthread_cond_type c_type;
long c_flags;
};
/*
* Flags for condition variables.
*/
#define COND_FLAGS_INITED 0x01
/*
* Static cond initialization values.
*/
#define PTHREAD_COND_STATIC_INITIALIZER \
{ COND_TYPE_FAST, TAILQ_INITIALIZER, NULL, NULL, \
0, 0, UMTX_INITIALIZER }
/*
* Semaphore definitions.
*/
struct sem {
#define SEM_MAGIC ((u_int32_t) 0x09fa4012)
u_int32_t magic;
pthread_mutex_t lock;
pthread_cond_t gtzero;
u_int32_t count;
u_int32_t nwaiters;
};
/*
* Cleanup definitions.
*/
struct pthread_cleanup {
struct pthread_cleanup *next;
void (*routine) ();
void *routine_arg;
};
struct pthread_attr {
int sched_policy;
int sched_inherit;
int sched_interval;
int prio;
int suspend;
int flags;
void *arg_attr;
void (*cleanup_attr) ();
void *stackaddr_attr;
size_t stacksize_attr;
size_t guardsize_attr;
};
/*
* Thread creation state attributes.
*/
#define PTHREAD_CREATE_RUNNING 0
#define PTHREAD_CREATE_SUSPENDED 1
/*
* Miscellaneous definitions.
*/
#define PTHREAD_STACK_DEFAULT 65536
/*
* Size of default red zone at the end of each stack. In actuality, this "red
* zone" is merely an unmapped region, except in the case of the initial stack.
* Since mmap() makes it possible to specify the maximum growth of a MAP_STACK
* region, an unmapped gap between thread stacks achieves the same effect as
* explicitly mapped red zones.
* This is declared and initialized in uthread_init.c.
*/
extern int _pthread_guard_default;
extern int _pthread_page_size;
/*
* 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 PTHREAD_STACK_INITIAL 0x100000
/*
* 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 PTHREAD_DEFAULT_PRIORITY 15
#define PTHREAD_MIN_PRIORITY 0
#define PTHREAD_MAX_PRIORITY 31 /* 0x1F */
#define PTHREAD_SIGNAL_PRIORITY 32 /* 0x20 */
#define PTHREAD_RT_PRIORITY 64 /* 0x40 */
#define PTHREAD_FIRST_PRIORITY PTHREAD_MIN_PRIORITY
#define PTHREAD_LAST_PRIORITY \
(PTHREAD_MAX_PRIORITY + PTHREAD_SIGNAL_PRIORITY + PTHREAD_RT_PRIORITY)
#define PTHREAD_BASE_PRIORITY(prio) ((prio) & PTHREAD_MAX_PRIORITY)
/*
* Clock resolution in microseconds.
*/
#define CLOCK_RES_USEC 10000
#define CLOCK_RES_USEC_MIN 1000
/*
* Time slice period in microseconds.
*/
#define TIMESLICE_USEC 20000
/*
* XXX Define a thread-safe macro to get the current time of day
* which is updated at regular intervals by the scheduling signal
* handler.
*/
#define GET_CURRENT_TOD(tv) gettimeofday(&(tv), NULL)
struct pthread_rwlockattr {
int pshared;
};
struct pthread_rwlock {
pthread_mutex_t lock; /* monitor lock */
int state; /* 0 = idle >0 = # of readers -1 = writer */
pthread_cond_t read_signal;
pthread_cond_t write_signal;
int blocked_writers;
};
/*
* Thread states.
*/
enum pthread_state {
PS_RUNNING,
PS_MUTEX_WAIT,
PS_COND_WAIT,
PS_SLEEP_WAIT, /* XXX We need to wrap syscalls to set this state */
PS_WAIT_WAIT,
PS_JOIN,
PS_DEAD,
PS_DEADLOCK,
PS_STATE_MAX
};
/*
* File descriptor locking definitions.
*/
#define FD_READ 0x1
#define FD_WRITE 0x2
#define FD_RDWR (FD_READ | FD_WRITE)
union pthread_wait_data {
pthread_mutex_t mutex;
pthread_cond_t cond;
spinlock_t *spinlock;
struct pthread *thread;
};
struct join_status {
struct pthread *thread;
void *ret;
int error;
};
struct pthread_state_data {
union pthread_wait_data psd_wait_data;
enum pthread_state psd_state;
int psd_flags;
};
struct pthread_specific_elem {
const void *data;
int seqno;
};
/*
* Thread structure.
*/
struct pthread {
/*
* Magic value to help recognize a valid thread structure
* from an invalid one:
*/
#define PTHREAD_MAGIC ((u_int32_t) 0xd09ba115)
u_int32_t magic;
char *name;
u_int64_t uniqueid; /* for gdb */
thr_id_t thr_id;
sigset_t savedsig;
int crit_ref; /* crit. section netsting level */
/*
* Lock for accesses to this thread structure.
*/
spinlock_t lock;
/* Queue entry for list of all threads: */
TAILQ_ENTRY(pthread) tle;
/* Queue entry for list of dead threads: */
TAILQ_ENTRY(pthread) dle;
/*
* Thread start routine, argument, stack pointer and thread
* attributes.
*/
void *(*start_routine)(void *);
void *arg;
void *stack;
struct pthread_attr attr;
/*
* Machine context, including signal state.
*/
ucontext_t ctx;
/*
* Cancelability flags - the lower 2 bits are used by cancel
* definitions in pthread.h
*/
#define PTHREAD_AT_CANCEL_POINT 0x0004
#define PTHREAD_CANCELLING 0x0008
/*
* Protected by Giant.
*/
int cancelflags;
/* Thread state: */
enum pthread_state 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;
struct join_status join_status;
/*
* A thread can belong to:
*
* o A queue of threads waiting for a mutex
* o A queue of threads waiting for a condition variable
*
* A thread can also be joining a thread (the joiner field above).
*
* It must not be possible for a thread to belong to any of the
* above queues while it is handling a signal. Signal handlers
* may longjmp back to previous stack frames circumventing normal
* control flow. This could corrupt queue integrity if the thread
* retains membership in the queue. Therefore, if a thread is a
* member of one of these queues when a signal handler is invoked,
* it must remove itself from the queue before calling the signal
* handler and reinsert itself after normal return of the handler.
*
* Use sqe for synchronization (mutex and condition variable) queue
* links.
*/
TAILQ_ENTRY(pthread) sqe; /* synchronization queue link */
/* Wait data. */
union pthread_wait_data data;
/* Miscellaneous flags; only set with signals deferred. */
int flags;
#define PTHREAD_FLAGS_PRIVATE 0x0001
#define PTHREAD_EXITING 0x0002
#define PTHREAD_FLAGS_IN_CONDQ 0x0080 /* in condition queue using sqe link*/
#define PTHREAD_FLAGS_IN_MUTEXQ 0x0100 /* in mutex queue using sqe link */
#define PTHREAD_FLAGS_SUSPENDED 0x0200 /* thread is suspended */
#define PTHREAD_FLAGS_TRACE 0x0400 /* for debugging purposes */
#define PTHREAD_FLAGS_IN_SYNCQ \
(PTHREAD_FLAGS_IN_CONDQ | PTHREAD_FLAGS_IN_MUTEXQ)
/*
* 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 mutexes.
*/
TAILQ_HEAD(, pthread_mutex) mutexq;
void *ret;
struct pthread_specific_elem *specific;
int specific_data_count;
/*
* Architecture specific id field used for _{get, set}_curthread()
* interface.
*/
void *arch_id;
/* Cleanup handlers Link List */
struct pthread_cleanup *cleanup;
char *fname; /* Ptr to source file name */
int lineno; /* Source line number. */
};
/*
* Global variables for the uthread kernel.
*/
SCLASS void *_usrstack
#ifdef GLOBAL_PTHREAD_PRIVATE
= (void *) USRSTACK;
#else
;
#endif
SCLASS spinlock_t stack_lock
#ifdef GLOBAL_PTHREAD_PRIVATE
= _SPINLOCK_INITIALIZER
#endif
;
#define STACK_LOCK _SPINLOCK(&stack_lock);
#define STACK_UNLOCK _SPINUNLOCK(&stack_lock);
/* List of all threads: */
SCLASS TAILQ_HEAD(, pthread) _thread_list
#ifdef GLOBAL_PTHREAD_PRIVATE
= TAILQ_HEAD_INITIALIZER(_thread_list);
#else
;
#endif
/* Dead threads: */
SCLASS TAILQ_HEAD(, pthread) _dead_list
#ifdef GLOBAL_PTHREAD_PRIVATE
= TAILQ_HEAD_INITIALIZER(_dead_list);
#else
;
#endif
/*
* These two locks protect the global active threads list and
* the global dead threads list, respectively. Combining these
* into one lock for both lists doesn't seem wise, since it
* would likely increase contention during busy thread creation
* and destruction for very little savings in space.
*
* The lock for the "dead threads list" must be a pthread mutex
* because it is used with condition variables to synchronize
* the gc thread with active threads in the process of exiting or
* dead threads who have just been joined.
*/
SCLASS spinlock_t thread_list_lock
#ifdef GLOBAL_PTHREAD_PRIVATE
= _SPINLOCK_INITIALIZER
#endif
;
SCLASS pthread_mutex_t dead_list_lock
#ifdef GLOBAL_PTHREAD_PRIVATE
= NULL
#endif
;
#define THREAD_LIST_LOCK _SPINLOCK(&thread_list_lock)
#define THREAD_LIST_UNLOCK _SPINUNLOCK(&thread_list_lock)
#define DEAD_LIST_LOCK _pthread_mutex_lock(&dead_list_lock)
#define DEAD_LIST_UNLOCK _pthread_mutex_unlock(&dead_list_lock)
/* Initial thread: */
SCLASS struct pthread *_thread_initial
#ifdef GLOBAL_PTHREAD_PRIVATE
= NULL;
#else
;
#endif
/* Default thread attributes: */
SCLASS struct pthread_attr pthread_attr_default
#ifdef GLOBAL_PTHREAD_PRIVATE
= { SCHED_RR, 0, TIMESLICE_USEC, PTHREAD_DEFAULT_PRIORITY,
PTHREAD_CREATE_RUNNING, PTHREAD_CREATE_JOINABLE, NULL, NULL, NULL,
PTHREAD_STACK_DEFAULT, -1 };
#else
;
#endif
/* Default mutex attributes: */
SCLASS struct pthread_mutex_attr pthread_mutexattr_default
#ifdef GLOBAL_PTHREAD_PRIVATE
= { PTHREAD_MUTEX_DEFAULT, PTHREAD_PRIO_NONE, 0, 0 };
#else
;
#endif
/* Default condition variable attributes: */
SCLASS struct pthread_cond_attr pthread_condattr_default
#ifdef GLOBAL_PTHREAD_PRIVATE
= { COND_TYPE_FAST, 0 };
#else
;
#endif
SCLASS int _clock_res_usec /* Clock resolution in usec. */
#ifdef GLOBAL_PTHREAD_PRIVATE
= CLOCK_RES_USEC;
#else
;
#endif
/* Giant lock. */
SCLASS struct umtx _giant_mutex
#ifdef GLOBAL_PTHREAD_PRIVATE
= UMTX_INITIALIZER
#endif
;
SCLASS int _giant_count;
/* Garbage collector condition variable. */
SCLASS pthread_cond_t _gc_cond
#ifdef GLOBAL_PTHREAD_PRIVATE
= NULL
#endif
;
/*
* Array of signal actions for this process.
*/
SCLASS struct sigaction _thread_sigact[NSIG];
/* Tracks the number of threads blocked while waiting for a spinlock. */
SCLASS volatile int _spinblock_count
#ifdef GLOBAL_PTHREAD_PRIVATE
= 0
#endif
;
/*
* And, should we climb the beanstalk,
* We'll meet his brother, Giant.
*/
void GIANT_LOCK(pthread_t);
void GIANT_UNLOCK(pthread_t);
/* Undefine the storage class specifier: */
#undef SCLASS
/*
* Function prototype definitions.
*/
__BEGIN_DECLS
char *__ttyname_basic(int);
char *__ttyname_r_basic(int, char *, size_t);
char *ttyname_r(int, char *, size_t);
void _cond_wait_backout(pthread_t);
int _find_thread(pthread_t);
pthread_t _get_curthread(void);
void *_set_curthread(ucontext_t *, struct pthread *, int *);
void _retire_thread(void *arch_id);
void *_thread_stack_alloc(size_t, size_t);
void _thread_stack_free(void *, size_t, size_t);
int _thread_create(pthread_t *,const pthread_attr_t *,void *(*start_routine)(void *),void *,pthread_t);
int _mutex_cv_lock(pthread_mutex_t *);
int _mutex_cv_unlock(pthread_mutex_t *);
void _mutex_lock_backout(pthread_t);
void _mutex_notify_priochange(pthread_t);
int _mutex_reinit(pthread_mutex_t *);
void _mutex_unlock_private(pthread_t);
int _cond_reinit(pthread_cond_t *);
void *_pthread_getspecific(pthread_key_t);
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));
pthread_t _pthread_self(void);
int _pthread_setspecific(pthread_key_t, const void *);
int _spintrylock(spinlock_t *);
inline void _spinlock_pthread(pthread_t, spinlock_t *);
inline void _spinunlock_pthread(pthread_t, spinlock_t *);
void _thread_exit(char *, int, char *);
void _thread_exit_cleanup(void);
void *_thread_cleanup(pthread_t);
void _thread_cleanupspecific(void);
void _thread_dump_info(void);
void _thread_init(void);
void _thread_sig_wrapper(int sig, siginfo_t *info, void *context);
void _thread_printf(int fd, const char *, ...);
void _thread_start(void);
void _thread_seterrno(pthread_t, int);
pthread_addr_t _thread_gc(pthread_addr_t);
void _thread_enter_cancellation_point(void);
void _thread_leave_cancellation_point(void);
void _thread_cancellation_point(void);
int _thread_suspend(pthread_t thread, struct timespec *abstime);
void _thread_critical_enter(pthread_t);
void _thread_critical_exit(pthread_t);
/* #include <sys/aio.h> */
#ifdef _SYS_AIO_H_
int __sys_aio_suspend(const struct aiocb * const[], int, const struct timespec *);
#endif
/* #include <sys/event.h> */
#ifdef _SYS_EVENT_H_
int __sys_kevent(int, const struct kevent *, int, struct kevent *,
int, const struct timespec *);
#endif
/* #include <sys/ioctl.h> */
#ifdef _SYS_IOCTL_H_
int __sys_ioctl(int, unsigned long, ...);
#endif
/* #include <sys/mman.h> */
#ifdef _SYS_MMAN_H_
int __sys_msync(void *, size_t, int);
#endif
/* #include <sys/mount.h> */
#ifdef _SYS_MOUNT_H_
int __sys_fstatfs(int, struct statfs *);
#endif
/* #include <sys/socket.h> */
#ifdef _SYS_SOCKET_H_
int __sys_accept(int, struct sockaddr *, socklen_t *);
int __sys_bind(int, const struct sockaddr *, socklen_t);
int __sys_connect(int, const struct sockaddr *, socklen_t);
int __sys_getpeername(int, struct sockaddr *, socklen_t *);
int __sys_getsockname(int, struct sockaddr *, socklen_t *);
int __sys_getsockopt(int, int, int, void *, socklen_t *);
int __sys_listen(int, 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);
int __sys_setsockopt(int, int, int, const void *, socklen_t);
int __sys_shutdown(int, int);
int __sys_socket(int, int, int);
int __sys_socketpair(int, int, int, int *);
#endif
/* #include <sys/stat.h> */
#ifdef _SYS_STAT_H_
int __sys_fchflags(int, u_long);
int __sys_fchmod(int, mode_t);
int __sys_fstat(int, struct stat *);
#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 <sys/wait.h> */
#ifdef WNOHANG
pid_t __sys_wait4(pid_t, int *, int, struct rusage *);
#endif
/* #include <dirent.h> */
#ifdef _DIRENT_H_
int __sys_getdirentries(int, char *, int, long *);
#endif
/* #include <fcntl.h> */
#ifdef _SYS_FCNTL_H_
int __sys_fcntl(int, int, ...);
int __sys_flock(int, int);
int __sys_open(const char *, int, ...);
#endif
/* #include <poll.h> */
#ifdef _SYS_POLL_H_
int __sys_poll(struct pollfd *, unsigned, int);
#endif
/* #include <signal.h> */
#ifdef _SIGNAL_H_
int __sys_sigaction(int, const struct sigaction *, struct sigaction *);
int __sys_sigaltstack(const struct sigaltstack *, struct sigaltstack *);
int __sys_sigprocmask(int, const sigset_t *, sigset_t *);
int __sys_sigreturn(ucontext_t *);
#endif
/* #include <unistd.h> */
#ifdef _UNISTD_H_
int __sys_close(int);
int __sys_dup(int);
int __sys_dup2(int, int);
int __sys_execve(const char *, char * const *, char * const *);
void __sys_exit(int);
int __sys_fchown(int, uid_t, gid_t);
pid_t __sys_fork(void);
long __sys_fpathconf(int, int);
int __sys_fsync(int);
int __sys_pipe(int *);
ssize_t __sys_read(int, void *, size_t);
ssize_t __sys_write(int, const void *, size_t);
#endif
__END_DECLS
#endif /* !_PTHREAD_PRIVATE_H */
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