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NetBSD/lib/libpthread/pthread_int.h

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/* $NetBSD: pthread_int.h,v 1.88 2012/11/21 19:19:24 christos Exp $ */
/*-
* Copyright (c) 2001, 2002, 2003, 2006, 2007, 2008 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Nathan J. Williams and Andrew Doran.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
/*
* NOTE: when changing anything in this file, please ensure that
* libpthread_dbg still compiles.
*/
#ifndef _LIB_PTHREAD_INT_H
#define _LIB_PTHREAD_INT_H
#include <sys/tls.h>
/* #define PTHREAD__DEBUG */
#define ERRORCHECK
#include "pthread_types.h"
#include "pthread_queue.h"
#include "pthread_md.h"
/* Need to use libc-private names for atomic operations. */
#include "../../common/lib/libc/atomic/atomic_op_namespace.h"
#include <sys/atomic.h>
#include <sys/rbtree.h>
#include <limits.h>
#include <lwp.h>
#include <signal.h>
#include <stdbool.h>
#ifdef __GNUC__
#define PTHREAD_HIDE __attribute__ ((visibility("hidden")))
#else
#define PTHREAD_HIDE /* nothing */
#endif
#define PTHREAD__UNPARK_MAX 32
/*
* The size of this structure needs to be no larger than struct
* __pthread_cleanup_store, defined in pthread.h.
*/
struct pt_clean_t {
PTQ_ENTRY(pt_clean_t) ptc_next;
void (*ptc_cleanup)(void *);
void *ptc_arg;
};
/* Private data for pthread_attr_t */
struct pthread_attr_private {
char ptap_name[PTHREAD_MAX_NAMELEN_NP];
void *ptap_namearg;
void *ptap_stackaddr;
size_t ptap_stacksize;
size_t ptap_guardsize;
struct sched_param ptap_sp;
int ptap_policy;
};
struct pthread_lock_ops {
void (*plo_init)(__cpu_simple_lock_t *);
int (*plo_try)(__cpu_simple_lock_t *);
void (*plo_unlock)(__cpu_simple_lock_t *);
void (*plo_lock)(__cpu_simple_lock_t *);
};
struct __pthread_st {
pthread_t pt_self; /* Must be first. */
#if defined(__HAVE_TLS_VARIANT_I) || defined(__HAVE_TLS_VARIANT_II)
struct tls_tcb *pt_tls; /* Thread Local Storage area */
#endif
unsigned int pt_magic; /* Magic number */
int pt_state; /* running, blocked, etc. */
pthread_mutex_t pt_lock; /* lock on state */
int pt_flags; /* see PT_FLAG_* below */
int pt_cancel; /* Deferred cancellation */
int pt_errno; /* Thread-specific errno. */
stack_t pt_stack; /* Our stack */
bool pt_stack_allocated;
size_t pt_guardsize;
void *pt_exitval; /* Read by pthread_join() */
char *pt_name; /* Thread's name, set by the app. */
int pt_willpark; /* About to park */
lwpid_t pt_unpark; /* Unpark this when parking */
struct pthread_lock_ops pt_lockops;/* Cached to avoid PIC overhead */
pthread_mutex_t *pt_droplock; /* Drop this lock if cancelled */
pthread_cond_t pt_joiners; /* Threads waiting to join. */
void *(*pt_func)(void *);/* Function to call at start. */
void *pt_arg; /* Argument to pass at start. */
/* Threads to defer waking, usually until pthread_mutex_unlock(). */
lwpid_t pt_waiters[PTHREAD__UNPARK_MAX];
size_t pt_nwaiters;
/* Stack of cancellation cleanup handlers and their arguments */
PTQ_HEAD(, pt_clean_t) pt_cleanup_stack;
/* LWP ID and entry on the list of all threads. */
lwpid_t pt_lid;
rb_node_t pt_alltree;
PTQ_ENTRY(__pthread_st) pt_allq;
PTQ_ENTRY(__pthread_st) pt_deadq;
/*
* General synchronization data. We try to align, as threads
* on other CPUs will access this data frequently.
*/
int pt_dummy1 __aligned(128);
struct lwpctl *pt_lwpctl; /* Kernel/user comms area */
volatile int pt_blocking; /* Blocking in userspace */
volatile int pt_rwlocked; /* Handed rwlock successfully */
volatile int pt_signalled; /* Received pthread_cond_signal() */
volatile int pt_mutexwait; /* Waiting to acquire mutex */
void * volatile pt_mutexnext; /* Next thread in chain */
void * volatile pt_sleepobj; /* Object slept on */
PTQ_ENTRY(__pthread_st) pt_sleep;
void (*pt_early)(void *);
int pt_dummy2 __aligned(128);
/* Thread-specific data. Large so it sits close to the end. */
int pt_havespecific;
struct pt_specific {
void *pts_value;
PTQ_ENTRY(pt_specific) pts_next;
} pt_specific[PTHREAD_KEYS_MAX];
/*
* Context for thread creation. At the end as it's cached
* and then only ever passed to _lwp_create().
*/
ucontext_t pt_uc;
};
/* Thread states */
#define PT_STATE_RUNNING 1
#define PT_STATE_ZOMBIE 5
#define PT_STATE_DEAD 6
/* Flag values */
#define PT_FLAG_DETACHED 0x0001
#define PT_FLAG_CS_DISABLED 0x0004 /* Cancellation disabled */
#define PT_FLAG_CS_ASYNC 0x0008 /* Cancellation is async */
#define PT_FLAG_CS_PENDING 0x0010
#define PT_FLAG_SCOPE_SYSTEM 0x0040
#define PT_FLAG_EXPLICIT_SCHED 0x0080
#define PT_FLAG_SUSPENDED 0x0100 /* In the suspended queue */
#define PT_MAGIC 0x11110001
#define PT_DEAD 0xDEAD0001
#define PT_ATTR_MAGIC 0x22220002
#define PT_ATTR_DEAD 0xDEAD0002
extern size_t pthread__stacksize;
extern size_t pthread__pagesize;
extern int pthread__nspins;
extern int pthread__concurrency;
extern int pthread__osrev;
extern int pthread__unpark_max;
/* Flag to be used in a ucontext_t's uc_flags indicating that
* the saved register state is "user" state only, not full
* trap state.
*/
#define _UC_USER_BIT 30
#define _UC_USER (1LU << _UC_USER_BIT)
/* Utility functions */
void pthread__unpark_all(pthread_queue_t *, pthread_t, pthread_mutex_t *)
PTHREAD_HIDE;
void pthread__unpark(pthread_queue_t *, pthread_t, pthread_mutex_t *)
PTHREAD_HIDE;
int pthread__park(pthread_t, pthread_mutex_t *, pthread_queue_t *,
const struct timespec *, int, const void *)
PTHREAD_HIDE;
pthread_mutex_t *pthread__hashlock(volatile const void *) PTHREAD_HIDE;
/* Internal locking primitives */
void pthread__lockprim_init(void) PTHREAD_HIDE;
void pthread_lockinit(pthread_spin_t *) PTHREAD_HIDE;
static inline void pthread__spinlock(pthread_t, pthread_spin_t *)
__attribute__((__always_inline__));
static inline void
pthread__spinlock(pthread_t self, pthread_spin_t *lock)
{
if (__predict_true((*self->pt_lockops.plo_try)(lock)))
return;
(*self->pt_lockops.plo_lock)(lock);
}
static inline int pthread__spintrylock(pthread_t, pthread_spin_t *)
__attribute__((__always_inline__));
static inline int
pthread__spintrylock(pthread_t self, pthread_spin_t *lock)
{
return (*self->pt_lockops.plo_try)(lock);
}
static inline void pthread__spinunlock(pthread_t, pthread_spin_t *)
__attribute__((__always_inline__));
static inline void
pthread__spinunlock(pthread_t self, pthread_spin_t *lock)
{
(*self->pt_lockops.plo_unlock)(lock);
}
extern const struct pthread_lock_ops *pthread__lock_ops;
int pthread__simple_locked_p(__cpu_simple_lock_t *) PTHREAD_HIDE;
#define pthread__simple_lock_init(alp) (*pthread__lock_ops->plo_init)(alp)
#define pthread__simple_lock_try(alp) (*pthread__lock_ops->plo_try)(alp)
#define pthread__simple_unlock(alp) (*pthread__lock_ops->plo_unlock)(alp)
void pthread__testcancel(pthread_t) PTHREAD_HIDE;
int pthread__find(pthread_t) PTHREAD_HIDE;
#ifndef PTHREAD_MD_INIT
#define PTHREAD_MD_INIT
#endif
#ifndef _INITCONTEXT_U_MD
#define _INITCONTEXT_U_MD(ucp)
#endif
#define _INITCONTEXT_U(ucp) do { \
(ucp)->uc_flags = _UC_CPU | _UC_STACK; \
_INITCONTEXT_U_MD(ucp) \
} while (/*CONSTCOND*/0)
#if !defined(__HAVE_TLS_VARIANT_I) && !defined(__HAVE_TLS_VARIANT_II)
#error Either __HAVE_TLS_VARIANT_I or __HAVE_TLS_VARIANT_II must be defined
#endif
static inline pthread_t __constfunc
pthread__self(void)
{
#ifdef __HAVE___LWP_GETTCB_FAST
struct tls_tcb * const tcb = __lwp_gettcb_fast();
#else
struct tls_tcb * const tcb = __lwp_getprivate_fast();
#endif
return (pthread_t)tcb->tcb_pthread;
}
#define pthread__abort() \
pthread__assertfunc(__FILE__, __LINE__, __func__, "unreachable")
#define pthread__assert(e) do { \
if (__predict_false(!(e))) \
pthread__assertfunc(__FILE__, __LINE__, __func__, #e); \
} while (/*CONSTCOND*/0)
#define pthread__error(err, msg, e) do { \
if (__predict_false(!(e))) { \
pthread__errorfunc(__FILE__, __LINE__, __func__, msg); \
return (err); \
} \
} while (/*CONSTCOND*/0)
void pthread__destroy_tsd(pthread_t) PTHREAD_HIDE;
__dead void pthread__assertfunc(const char *, int, const char *, const char *)
PTHREAD_HIDE;
void pthread__errorfunc(const char *, int, const char *, const char *)
PTHREAD_HIDE;
char *pthread__getenv(const char *) PTHREAD_HIDE;
__dead void pthread__cancelled(void) PTHREAD_HIDE;
void pthread__mutex_deferwake(pthread_t, pthread_mutex_t *) PTHREAD_HIDE;
int pthread__checkpri(int) PTHREAD_HIDE;
int pthread__add_specific(pthread_t, pthread_key_t, const void *) PTHREAD_HIDE;
#ifndef pthread__smt_pause
#define pthread__smt_pause() /* nothing */
#endif
#ifndef pthread__smt_wake
#define pthread__smt_wake() /* nothing */
#endif
/*
* Bits in the owner field of the lock that indicate lock state. If the
* WRITE_LOCKED bit is clear, then the owner field is actually a count of
* the number of readers.
*/
#define RW_HAS_WAITERS 0x01 /* lock has waiters */
#define RW_WRITE_WANTED 0x02 /* >= 1 waiter is a writer */
#define RW_WRITE_LOCKED 0x04 /* lock is currently write locked */
#define RW_UNUSED 0x08 /* currently unused */
#define RW_FLAGMASK 0x0f
#define RW_READ_COUNT_SHIFT 4
#define RW_READ_INCR (1 << RW_READ_COUNT_SHIFT)
#define RW_THREAD ((uintptr_t)-RW_READ_INCR)
#define RW_OWNER(rw) ((rw)->rw_owner & RW_THREAD)
#define RW_COUNT(rw) ((rw)->rw_owner & RW_THREAD)
#define RW_FLAGS(rw) ((rw)->rw_owner & ~RW_THREAD)
#endif /* _LIB_PTHREAD_INT_H */
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