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NetBSD/lib/libpthread/pthread_int.h

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/* $NetBSD: pthread_int.h,v 1.14 2003/06/26 01:26:11 nathanw Exp $ */
/*-
* Copyright (c) 2001 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Nathan J. Williams.
*
* 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 the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* 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.
*/
#ifndef _LIB_PTHREAD_INT_H
#define _LIB_PTHREAD_INT_H
#define PTHREAD__DEBUG
#define ERRORCHECK
#include "pthread_types.h"
#include "pthread_queue.h"
#include "pthread_debug.h"
#include "pthread_md.h"
#include <sa.h>
#include <signal.h>
/*
* 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;
};
struct pt_alarm_t {
PTQ_ENTRY(pt_alarm_t) pta_next;
pthread_spin_t pta_lock;
const struct timespec *pta_time;
void (*pta_func)(void *);
void *pta_arg;
int pta_fired;
};
struct pthread_st {
unsigned int pt_magic;
/* Identifier, for debugging and for preventing recycling. */
int pt_num;
int pt_type; /* normal, upcall, or idle */
int pt_state; /* running, blocked, etc. */
pthread_spin_t pt_statelock; /* lock on pt_state */
int pt_flags; /* see PT_FLAG_* below */
int pt_cancel; /* Deferred cancellation */
int pt_spinlocks; /* Number of spinlocks held. */
int pt_blockedlwp; /* LWP/SA number when blocked */
int pt_errno; /* Thread-specific errno. */
/* Entry on the run queue */
PTQ_ENTRY(pthread_st) pt_runq;
/* Entry on the list of all threads */
PTQ_ENTRY(pthread_st) pt_allq;
/* Entry on the sleep queue (xxx should be same as run queue?) */
PTQ_ENTRY(pthread_st) pt_sleep;
/* Object we're sleeping on */
void *pt_sleepobj;
/* Queue we're sleeping on */
struct pthread_queue_t *pt_sleepq;
/* Lock protecting that queue */
pthread_spin_t *pt_sleeplock;
stack_t pt_stack; /* Our stack */
ucontext_t *pt_uc; /* Saved context when we're stopped */
ucontext_t *pt_trapuc; /* Kernel-saved context */
sigset_t pt_sigmask; /* Signals we won't take. */
sigset_t pt_siglist; /* Signals pending for us. */
sigset_t pt_sigblocked; /* Signals delivered while blocked. */
sigset_t *pt_sigwait; /* Signals waited for in sigwait */
siginfo_t *pt_wsig;
pthread_spin_t pt_siglock; /* Lock on above */
void * pt_exitval; /* Read by pthread_join() */
/* Stack of cancellation cleanup handlers and their arguments */
PTQ_HEAD(, pt_clean_t) pt_cleanup_stack;
/* Thread's name, set by the application. */
char* pt_name;
/* Other threads trying to pthread_join() us. */
struct pthread_queue_t pt_joiners;
/* Lock for above, and for changing pt_state to ZOMBIE or DEAD,
* and for setting the DETACHED flag. Also protects pt_name.
*/
pthread_spin_t pt_join_lock;
/* Thread we were going to switch to before we were preempted
* ourselves. Will be used by the upcall that's continuing us.
*/
pthread_t pt_switchto;
ucontext_t* pt_switchtouc;
/* Threads that are preempted with spinlocks held will be
* continued until they unlock their spinlock. When they do
* so, they should jump ship to the thread pointed to by
* pt_next.
*/
pthread_t pt_next;
/* The upcall that is continuing this thread */
pthread_t pt_parent;
/* A queue lock that this thread held while trying to
* context switch to another process.
*/
pthread_spin_t* pt_heldlock;
/* Thread-specific data */
void* pt_specific[PTHREAD_KEYS_MAX];
#ifdef PTHREAD__DEBUG
int blocks;
int preempts;
int rescheds;
#endif
};
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 *);
};
/* Thread types */
#define PT_THREAD_NORMAL 1
#define PT_THREAD_UPCALL 2
#define PT_THREAD_IDLE 3
/* Thread states */
#define PT_STATE_RUNNING 1
#define PT_STATE_RUNNABLE 2
#define PT_STATE_BLOCKED_SYS 3
#define PT_STATE_BLOCKED_QUEUE 4
#define PT_STATE_ZOMBIE 5
#define PT_STATE_DEAD 6
#define PT_STATE_RECYCLABLE 7
/* Flag values */
#define PT_FLAG_DETACHED 0x0001
#define PT_FLAG_IDLED 0x0002
#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_SIGDEFERRED 0x0020 /* There are signals to take */
#define PT_MAGIC 0x11110001
#define PT_DEAD 0xDEAD0001
#define PT_ATTR_MAGIC 0x22220002
#define PT_ATTR_DEAD 0xDEAD0002
#define PT_STACKSIZE (1<<18)
#define PT_STACKMASK (PT_STACKSIZE-1)
#define PT_UPCALLSTACKS 16
#define PT_ALARMTIMER_MAGIC 0x88880010
#define PT_RRTIMER_MAGIC 0x88880020
#define NIDLETHREADS 4
#define IDLESPINS 1000
/* 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)
void pthread_init(void) __attribute__ ((__constructor__));
/* Utility functions */
/* Set up/clean up a thread's basic state. */
void pthread__initthread(pthread_t self, pthread_t t);
/* Go do something else. Don't go back on the run queue */
void pthread__block(pthread_t self, pthread_spin_t* queuelock);
/* Put a thread back on the run queue */
void pthread__sched(pthread_t self, pthread_t thread);
void pthread__sched_sleepers(pthread_t self, struct pthread_queue_t *threadq);
void pthread__sched_idle(pthread_t self, pthread_t thread);
void pthread__sched_idle2(pthread_t self);
void pthread__sched_bulk(pthread_t self, pthread_t qhead);
void pthread__idle(void);
/* Get the next thread */
pthread_t pthread__next(pthread_t self);
int pthread__stackalloc(pthread_t *t);
void pthread__initmain(pthread_t *t);
void pthread__sa_start(void);
void pthread__sa_recycle(pthread_t old, pthread_t new);
/* Alarm code */
void pthread__alarm_init(void);
void pthread__alarm_add(pthread_t, struct pt_alarm_t *,
const struct timespec *, void (*)(void *), void *);
void pthread__alarm_del(pthread_t, struct pt_alarm_t *);
int pthread__alarm_fired(struct pt_alarm_t *);
void pthread__alarm_process(pthread_t self, void *arg);
/* Internal locking primitives */
void pthread__lockprim_init(void);
void pthread_lockinit(pthread_spin_t *lock);
void pthread_spinlock(pthread_t thread, pthread_spin_t *lock);
int pthread_spintrylock(pthread_t thread, pthread_spin_t *lock);
void pthread_spinunlock(pthread_t thread, pthread_spin_t *lock);
extern const struct pthread_lock_ops *pthread__lock_ops;
#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)
#ifndef _getcontext_u
int _getcontext_u(ucontext_t *);
#endif
#ifndef _setcontext_u
int _setcontext_u(const ucontext_t *);
#endif
#ifndef _swapcontext_u
int _swapcontext_u(ucontext_t *, const ucontext_t *);
#endif
void pthread__testcancel(pthread_t self);
int pthread__find(pthread_t self, pthread_t target);
#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)
#ifdef __PTHREAD_SIGNAL_PRIVATE
/*
* Macros for converting from ucontext to sigcontext and vice-versa.
* Note that going from sigcontext->ucontext is only safe for a
* sigcontext that was first created from a ucontext.
*
* Arch-specific code can override this, if necessary. It may also
* be necessary for arch-specific code to include extra info along with
* the sigcontext.
*/
#ifndef PTHREAD_SIGCONTEXT_EXTRA
#define PTHREAD_SIGCONTEXT_EXTRA
#endif
struct pthread__sigcontext {
struct sigcontext psc_context;
PTHREAD_SIGCONTEXT_EXTRA
};
#ifndef PTHREAD_UCONTEXT_TO_SIGCONTEXT
#define PTHREAD_UCONTEXT_TO_SIGCONTEXT(mask, uc, psc) \
do { \
(uc)->uc_sigmask = *(mask); \
/* \
* XXX We may want to check for _UC_USER here and do a \
* XXX _INITCONTEXT_U_MD() and clearing _UC_USER on such \
* XXX contexts before converting to a signcontext, thus \
* XXX allowing signal handlers to modify the non-_UC_USER \
* XXX registers. Hazy territory; ignore it for now. \
*/ \
_UCONTEXT_TO_SIGCONTEXT((uc), &(psc)->psc_context); \
} while (/*CONSTCOND*/0)
#define PTHREAD_SIGCONTEXT_TO_UCONTEXT(psc, uc) \
do { \
_SIGCONTEXT_TO_UCONTEXT(&(psc)->psc_context, (uc)); \
(uc)->uc_flags &= ~_UC_SIGMASK; \
} while (/*CONSTCOND*/0)
#else
void pthread__ucontext_to_sigcontext(const sigset_t *, ucontext_t *,
struct pthread__sigcontext *);
void pthread__sigcontext_to_ucontext(const struct pthread__sigcontext *,
ucontext_t *);
#endif /* PTHREAD_UCONTEXT_TO_SIGCONTEXT */
#endif /* __PTHREAD_SIGNAL_PRIVATE */
#ifdef PTHREAD_MACHINE_HAS_ID_REGISTER
#define pthread__id(reg) (reg)
#else
/* Stack location of pointer to a particular thread */
#define pthread__id(sp) \
((pthread_t) (((vaddr_t)(sp)) & ~PT_STACKMASK))
#define pthread__id_reg() pthread__sp()
#endif
#define pthread__self() (pthread__id(pthread__id_reg()))
#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)
/* These three routines are defined in processor-specific code. */
void pthread__upcall_switch(pthread_t self, pthread_t next);
void pthread__switch(pthread_t self, pthread_t next);
void pthread__locked_switch(pthread_t self, pthread_t next,
pthread_spin_t *lock);
void pthread__signal_init(void);
void pthread__signal(pthread_t self, pthread_t t, int sig, int code);
void pthread__deliver_signal(pthread_t self, pthread_t t, int sig, int code);
void pthread__signal_deferred(pthread_t self, pthread_t t);
void pthread__destroy_tsd(pthread_t self);
void pthread__assertfunc(char *file, int line, char *function, char *expr);
void pthread__errorfunc(char *file, int line, char *function, char *msg);
#endif /* _LIB_PTHREAD_INT_H */
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