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freebsd-dev/lib/libthr/thread/thr_private.h
David Xu 2bd2c90703 Use kernel provided userspace condition variable to implement pthread 
condition variable.
2006-12-04 14:20:41 +00:00

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/*
* Copyright (C) 2005 Daniel M. Eischen <deischen@freebsd.org>
* Copyright (c) 2005 David Xu <davidxu@freebsd.org>
* 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 unmodified, 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.
*
* $FreeBSD$
*/
#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 <unistd.h>
#include <ucontext.h>
#include <sys/thr.h>
#include <pthread.h>
#ifndef __hidden
#define __hidden __attribute__((visibility("hidden")))
#endif
#include "pthread_md.h"
#include "thr_umtx.h"
#include "thread_db.h"
typedef TAILQ_HEAD(pthreadlist, pthread) pthreadlist;
typedef TAILQ_HEAD(atfork_head, pthread_atfork) atfork_head;
TAILQ_HEAD(mutex_queue, pthread_mutex);
/* 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
#ifdef PIC
# define STATIC_LIB_REQUIRE(name)
#else
# define STATIC_LIB_REQUIRE(name) __asm (".globl " #name)
#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.
*/
struct umutex m_lock;
enum pthread_mutextype m_type;
struct pthread *m_owner;
int m_flags;
int m_count;
int m_refcount;
/*
* Link for 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;
int m_flags;
};
#define PTHREAD_MUTEXATTR_STATIC_INITIALIZER \
{ PTHREAD_MUTEX_DEFAULT, PTHREAD_PRIO_NONE, 0, MUTEX_FLAGS_PRIVATE }
struct pthread_cond {
struct umutex c_lock;
struct ucond c_kerncv;
int c_pshared;
int c_clockid;
};
struct pthread_cond_attr {
int c_pshared;
int c_clockid;
};
struct pthread_barrier {
struct umutex b_lock;
volatile umtx_t b_cycle;
volatile int b_count;
volatile int b_waiters;
};
struct pthread_barrierattr {
int pshared;
};
struct pthread_spinlock {
struct umutex 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 *args);
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 prio;
int suspend;
#define THR_STACK_USER 0x100 /* 0xFF reserved for <pthread.h> */
int flags;
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 priorities returned by kernel.
*/
#define THR_MIN_PRIORITY (_thr_priorities[SCHED_OTHER-1].pri_min)
#define THR_MAX_PRIORITY (_thr_priorities[SCHED_OTHER-1].pri_max)
#define THR_DEF_PRIORITY (_thr_priorities[SCHED_OTHER-1].pri_default)
#define THR_MIN_RR_PRIORITY (_thr_priorities[SCHED_RR-1].pri_min)
#define THR_MAX_RR_PRIORITY (_thr_priorities[SCHED_RR-1].pri_max)
#define THR_DEF_RR_PRIORITY (_thr_priorities[SCHED_RR-1].pri_default)
/* XXX The SCHED_FIFO should have same priority range as SCHED_RR */
#define THR_MIN_FIFO_PRIORITY (_thr_priorities[SCHED_FIFO_1].pri_min)
#define THR_MAX_FIFO_PRIORITY (_thr_priorities[SCHED_FIFO-1].pri_max)
#define THR_DEF_FIFO_PRIORITY (_thr_priorities[SCHED_FIFO-1].pri_default)
struct pthread_prio {
int pri_min;
int pri_max;
int pri_default;
};
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
};
struct pthread_specific_elem {
const void *data;
int seqno;
};
struct pthread_key {
volatile int allocated;
int seqno;
void (*destructor)(void *);
};
/*
* lwpid_t is 32bit but kernel thr API exports tid as long type
* in very earily date.
*/
#define TID(thread) ((uint32_t) ((thread)->tid))
/*
* Thread structure.
*/
struct pthread {
/* Kernel thread id. */
long tid;
#define TID_TERMINATED 1
/*
* Lock for accesses to this thread structure.
*/
struct umutex lock;
/* Internal condition variable cycle number. */
umtx_t cycle;
/* How many low level locks the thread held. */
int locklevel;
/*
* Set to non-zero when this thread has entered a critical
* region. We allow for recursive entries into critical regions.
*/
int critical_count;
/* 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;
#define SHOULD_CANCEL(thr) \
((thr)->cancel_pending && \
((thr)->cancel_point || (thr)->cancel_async) && \
(thr)->cancel_enable && (thr)->cancelling == 0)
/* Cancellation is enabled */
int cancel_enable;
/* Cancellation request is pending */
int cancel_pending;
/* Thread is at cancellation point */
int cancel_point;
/* Cancellation should be synchoronized */
int cancel_defer;
/* Asynchronouse cancellation is enabled */
int cancel_async;
/* Cancellation is in progress */
int cancelling;
/* Thread temporary signal mask. */
sigset_t sigmask;
/* 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;
/* 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 */
/* Queue of currently owned NORMAL or PRIO_INHERIT type mutexes. */
struct mutex_queue mutexq;
/* Queue of all owned PRIO_PROTECT mutexes. */
struct mutex_queue pp_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;
/*
* Magic value to help recognize a valid thread structure
* from an invalid one:
*/
#define THR_MAGIC ((u_int32_t) 0xd09ba115)
u_int32_t magic;
/* Enable event reporting */
int report_events;
/* Event mask */
int event_mask;
/* Event */
td_event_msg_t event_buf;
};
#define THR_IN_CRITICAL(thrd) \
(((thrd)->locklevel > 0) || \
((thrd)->critical_count > 0))
#define THR_CRITICAL_ENTER(thrd) \
(thrd)->critical_count++
#define THR_CRITICAL_LEAVE(thrd) \
(thrd)->critical_count--; \
_thr_ast(thrd);
#define THR_UMUTEX_TRYLOCK(thrd, lck) \
_thr_umutex_trylock((lck), TID(thrd))
#define THR_UMUTEX_LOCK(thrd, lck) \
_thr_umutex_lock((lck), TID(thrd))
#define THR_UMUTEX_TIMEDLOCK(thrd, lck, timo) \
_thr_umutex_timedlock((lck), TID(thrd), (timo))
#define THR_UMUTEX_UNLOCK(thrd, lck) \
_thr_umutex_unlock((lck), TID(thrd))
#define THR_LOCK_ACQUIRE(thrd, lck) \
do { \
(thrd)->locklevel++; \
_thr_umutex_lock(lck, TID(thrd)); \
} while (0)
#ifdef _PTHREADS_INVARIANTS
#define THR_ASSERT_LOCKLEVEL(thrd) \
do { \
if (__predict_false((thrd)->locklevel <= 0)) \
_thr_assert_lock_level(); \
} while (0)
#else
#define THR_ASSERT_LOCKLEVEL(thrd)
#endif
#define THR_LOCK_RELEASE(thrd, lck) \
do { \
THR_ASSERT_LOCKLEVEL(thrd); \
_thr_umutex_unlock((lck), TID(thrd)); \
(thrd)->locklevel--; \
_thr_ast(thrd); \
} 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 SHOULD_REPORT_EVENT(curthr, e) \
(curthr->report_events && \
(((curthr)->event_mask | _thread_event_mask ) & e) != 0)
extern int __isthreaded;
/*
* Global variables for the pthread kernel.
*/
extern char *_usrstack __hidden;
extern struct pthread *_thr_initial __hidden;
extern int _thr_scope_system __hidden;
/* For debugger */
extern int _libthr_debug;
extern int _thread_event_mask;
extern struct pthread *_thread_last_event;
/* List of all threads: */
extern pthreadlist _thread_list;
/* List of threads needing GC: */
extern pthreadlist _thread_gc_list __hidden;
extern int _thread_active_threads;
extern atfork_head _thr_atfork_list __hidden;
extern struct umutex _thr_atfork_lock __hidden;
/* Default thread attributes: */
extern struct pthread_attr _pthread_attr_default __hidden;
/* Default mutex attributes: */
extern struct pthread_mutex_attr _pthread_mutexattr_default __hidden;
/* Default condition variable attributes: */
extern struct pthread_cond_attr _pthread_condattr_default __hidden;
extern struct pthread_prio _thr_priorities[] __hidden;
extern pid_t _thr_pid __hidden;
extern int _thr_smp_cpus __hidden;
extern size_t _thr_guard_default __hidden;
extern size_t _thr_stack_default __hidden;
extern size_t _thr_stack_initial __hidden;
extern int _thr_page_size __hidden;
/* Garbage thread count. */
extern int _gc_count __hidden;
extern struct umutex _mutex_static_lock __hidden;
extern struct umutex _cond_static_lock __hidden;
extern struct umutex _rwlock_static_lock __hidden;
extern struct umutex _keytable_lock __hidden;
extern struct umutex _thr_list_lock __hidden;
extern struct umutex _thr_event_lock __hidden;
/*
* Function prototype definitions.
*/
__BEGIN_DECLS
int _thr_setthreaded(int) __hidden;
int _mutex_cv_lock(pthread_mutex_t *, int count) __hidden;
int _mutex_cv_unlock(pthread_mutex_t *, int *count) __hidden;
int _mutex_reinit(pthread_mutex_t *) __hidden;
void _mutex_fork(struct pthread *curthread) __hidden;
void _mutex_unlock_private(struct pthread *) __hidden;
void _libpthread_init(struct pthread *) __hidden;
struct pthread *_thr_alloc(struct pthread *) __hidden;
void _thread_exit(const char *, int, const char *) __hidden __dead2;
void _thr_exit_cleanup(void) __hidden;
int _thr_ref_add(struct pthread *, struct pthread *, int) __hidden;
void _thr_ref_delete(struct pthread *, struct pthread *) __hidden;
void _thr_ref_delete_unlocked(struct pthread *, struct pthread *) __hidden;
int _thr_find_thread(struct pthread *, struct pthread *, int) __hidden;
void _thr_rtld_init(void) __hidden;
void _thr_rtld_fini(void) __hidden;
int _thr_stack_alloc(struct pthread_attr *) __hidden;
void _thr_stack_free(struct pthread_attr *) __hidden;
void _thr_free(struct pthread *, struct pthread *) __hidden;
void _thr_gc(struct pthread *) __hidden;
void _thread_cleanupspecific(void) __hidden;
void _thread_dump_info(void) __hidden;
void _thread_printf(int, const char *, ...) __hidden;
void _thr_spinlock_init(void) __hidden;
void _thr_cancel_enter(struct pthread *) __hidden;
void _thr_cancel_leave(struct pthread *) __hidden;
void _thr_cancel_enter_defer(struct pthread *) __hidden;
void _thr_cancel_leave_defer(struct pthread *, int) __hidden;
void _thr_testcancel(struct pthread *) __hidden;
void _thr_signal_block(struct pthread *) __hidden;
void _thr_signal_unblock(struct pthread *) __hidden;
void _thr_signal_init(void) __hidden;
void _thr_signal_deinit(void) __hidden;
int _thr_send_sig(struct pthread *, int sig) __hidden;
void _thr_list_init(void) __hidden;
void _thr_hash_add(struct pthread *) __hidden;
void _thr_hash_remove(struct pthread *) __hidden;
struct pthread *_thr_hash_find(struct pthread *) __hidden;
void _thr_link(struct pthread *, struct pthread *) __hidden;
void _thr_unlink(struct pthread *, struct pthread *) __hidden;
void _thr_suspend_check(struct pthread *) __hidden;
void _thr_assert_lock_level(void) __hidden __dead2;
void _thr_ast(struct pthread *) __hidden;
void _thr_once_init(void) __hidden;
void _thr_report_creation(struct pthread *curthread,
struct pthread *newthread) __hidden;
void _thr_report_death(struct pthread *curthread) __hidden;
int _thr_getscheduler(lwpid_t, int *, struct sched_param *) __hidden;
int _thr_setscheduler(lwpid_t, int, const struct sched_param *) __hidden;
int _rtp_to_schedparam(const struct rtprio *rtp, int *policy,
struct sched_param *param) __hidden;
int _schedparam_to_rtp(int policy, const struct sched_param *param,
struct rtprio *rtp) __hidden;
void _thread_bp_create(void);
void _thread_bp_death(void);
/* #include <fcntl.h> */
#ifdef _SYS_FCNTL_H_
int __sys_fcntl(int, int, ...);
int __sys_open(const char *, int, ...);
#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 *);
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 <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_fork(void);
pid_t __sys_getpid(void);
ssize_t __sys_read(int, void *, size_t);
ssize_t __sys_write(int, const void *, size_t);
void __sys_exit(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 */
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