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glibc/linuxthreads/internals.h
Ulrich Drepper 535b764df5 Update. 
* elf/rtld.c (_dl_start_final): Allocate TLS and initialize
	thread-pointer as soon as possible.
	* sysdeps/generic/ldsodefs.h: Include <tls.h>.  Define first TLS
	elements in rtld_global.
	* sysdeps/generic/tls.h: New file.
	* elf/Makefile (distribute): Add tls.h.
	* sysdeps/i386/dl-machine.h (elf_machine_rel): Add support for TLS
	relocations.  Not complete yet.

	* resolv/resolv.h: Allow user to define __need_res_state and only
	define __res_start structure then.
	* include/resolv.h: Only declare functions if _RESOLV_H_ is defined.
2002-02-05 00:57:29 +00:00

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/* Linuxthreads - a simple clone()-based implementation of Posix */
/* threads for Linux. */
/* Copyright (C) 1996 Xavier Leroy (Xavier.Leroy@inria.fr) */
/* */
/* This program is free software; you can redistribute it and/or */
/* modify it under the terms of the GNU Library General Public License */
/* as published by the Free Software Foundation; either version 2 */
/* of the License, or (at your option) any later version. */
/* */
/* This program is distributed in the hope that it will be useful, */
/* but WITHOUT ANY WARRANTY; without even the implied warranty of */
/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */
/* GNU Library General Public License for more details. */
#ifndef _INTERNALS_H
#define _INTERNALS_H 1
/* Internal data structures */
/* Includes */
#include <limits.h>
#include <unistd.h>
#include <stackinfo.h>
#include "descr.h"
extern long int testandset (int *spinlock);
extern int __compare_and_swap (long int *p, long int oldval, long int newval);
#include "semaphore.h"
#ifndef THREAD_GETMEM
# define THREAD_GETMEM(descr, member) descr->member
#endif
#ifndef THREAD_GETMEM_NC
# define THREAD_GETMEM_NC(descr, member) descr->member
#endif
#ifndef THREAD_SETMEM
# define THREAD_SETMEM(descr, member, value) descr->member = (value)
#endif
#ifndef THREAD_SETMEM_NC
# define THREAD_SETMEM_NC(descr, member, value) descr->member = (value)
#endif
typedef void (*destr_function)(void *);
struct pthread_key_struct {
int in_use; /* already allocated? */
destr_function destr; /* destruction routine */
};
#define PTHREAD_START_ARGS_INITIALIZER(fct) \
{ (void *(*) (void *)) fct, NULL, {{0, }}, 0, { 0 } }
/* The type of thread handles. */
typedef struct pthread_handle_struct * pthread_handle;
struct pthread_handle_struct {
struct _pthread_fastlock h_lock; /* Fast lock for sychronized access */
pthread_descr h_descr; /* Thread descriptor or NULL if invalid */
char * h_bottom; /* Lowest address in the stack thread */
};
/* The type of messages sent to the thread manager thread */
struct pthread_request {
pthread_descr req_thread; /* Thread doing the request */
enum { /* Request kind */
REQ_CREATE, REQ_FREE, REQ_PROCESS_EXIT, REQ_MAIN_THREAD_EXIT,
REQ_POST, REQ_DEBUG, REQ_KICK, REQ_FOR_EACH_THREAD
} req_kind;
union { /* Arguments for request */
struct { /* For REQ_CREATE: */
const pthread_attr_t * attr; /* thread attributes */
void * (*fn)(void *); /* start function */
void * arg; /* argument to start function */
sigset_t mask; /* signal mask */
} create;
struct { /* For REQ_FREE: */
pthread_t thread_id; /* identifier of thread to free */
} free;
struct { /* For REQ_PROCESS_EXIT: */
int code; /* exit status */
} exit;
void * post; /* For REQ_POST: the semaphore */
struct { /* For REQ_FOR_EACH_THREAD: callback */
void (*fn)(void *, pthread_descr);
void *arg;
} for_each;
} req_args;
};
/* Signals used for suspend/restart and for cancellation notification. */
extern int __pthread_sig_restart;
extern int __pthread_sig_cancel;
/* Signal used for interfacing with gdb */
extern int __pthread_sig_debug;
/* Global array of thread handles, used for validating a thread id
and retrieving the corresponding thread descriptor. Also used for
mapping the available stack segments. */
extern struct pthread_handle_struct __pthread_handles[PTHREAD_THREADS_MAX];
/* Descriptor of the initial thread */
extern struct _pthread_descr_struct __pthread_initial_thread;
/* Descriptor of the manager thread */
extern struct _pthread_descr_struct __pthread_manager_thread;
/* Descriptor of the main thread */
extern pthread_descr __pthread_main_thread;
/* Limit between the stack of the initial thread (above) and the
stacks of other threads (below). Aligned on a STACK_SIZE boundary.
Initially 0, meaning that the current thread is (by definition)
the initial thread. */
extern char *__pthread_initial_thread_bos;
/* Indicate whether at least one thread has a user-defined stack (if 1),
or all threads have stacks supplied by LinuxThreads (if 0). */
extern int __pthread_nonstandard_stacks;
/* File descriptor for sending requests to the thread manager.
Initially -1, meaning that __pthread_initialize_manager must be called. */
extern int __pthread_manager_request;
/* Other end of the pipe for sending requests to the thread manager. */
extern int __pthread_manager_reader;
/* Limits of the thread manager stack. */
extern char *__pthread_manager_thread_bos;
extern char *__pthread_manager_thread_tos;
#ifdef FLOATING_STACKS
/* Maximum stack size. */
extern size_t __pthread_max_stacksize;
#endif
/* Pending request for a process-wide exit */
extern int __pthread_exit_requested, __pthread_exit_code;
/* Set to 1 by gdb if we're debugging */
extern volatile int __pthread_threads_debug;
/* Globally enabled events. */
extern volatile td_thr_events_t __pthread_threads_events;
/* Pointer to descriptor of thread with last event. */
extern volatile pthread_descr __pthread_last_event;
/* Flag which tells whether we are executing on SMP kernel. */
extern int __pthread_smp_kernel;
/* Return the handle corresponding to a thread id */
static inline pthread_handle thread_handle(pthread_t id)
{
return &__pthread_handles[id % PTHREAD_THREADS_MAX];
}
/* Validate a thread handle. Must have acquired h->h_spinlock before. */
static inline int invalid_handle(pthread_handle h, pthread_t id)
{
return h->h_descr == NULL || h->h_descr->p_tid != id || h->h_descr->p_terminated;
}
static inline int nonexisting_handle(pthread_handle h, pthread_t id)
{
return h->h_descr == NULL || h->h_descr->p_tid != id;
}
/* Fill in defaults left unspecified by pt-machine.h. */
/* We round up a value with page size. */
#ifndef page_roundup
#define page_roundup(v,p) ((((size_t) (v)) + (p) - 1) & ~((p) - 1))
#endif
/* The page size we can get from the system. This should likely not be
changed by the machine file but, you never know. */
#ifndef PAGE_SIZE
#define PAGE_SIZE (sysconf (_SC_PAGE_SIZE))
#endif
/* The max size of the thread stack segments. If the default
THREAD_SELF implementation is used, this must be a power of two and
a multiple of PAGE_SIZE. */
#ifndef STACK_SIZE
#define STACK_SIZE (2 * 1024 * 1024)
#endif
/* The initial size of the thread stack. Must be a multiple of PAGE_SIZE. */
#ifndef INITIAL_STACK_SIZE
#define INITIAL_STACK_SIZE (4 * PAGE_SIZE)
#endif
/* Size of the thread manager stack. The "- 32" avoids wasting space
with some malloc() implementations. */
#ifndef THREAD_MANAGER_STACK_SIZE
#define THREAD_MANAGER_STACK_SIZE (2 * PAGE_SIZE - 32)
#endif
/* The base of the "array" of thread stacks. The array will grow down from
here. Defaults to the calculated bottom of the initial application
stack. */
#ifndef THREAD_STACK_START_ADDRESS
#define THREAD_STACK_START_ADDRESS __pthread_initial_thread_bos
#endif
/* Get some notion of the current stack. Need not be exactly the top
of the stack, just something somewhere in the current frame. */
#ifndef CURRENT_STACK_FRAME
#define CURRENT_STACK_FRAME ({ char __csf; &__csf; })
#endif
/* Recover thread descriptor for the current thread */
extern pthread_descr __pthread_find_self (void) __attribute__ ((const));
static inline pthread_descr thread_self (void) __attribute__ ((const));
static inline pthread_descr thread_self (void)
{
#ifdef THREAD_SELF
return THREAD_SELF;
#else
char *sp = CURRENT_STACK_FRAME;
if (sp >= __pthread_initial_thread_bos)
return &__pthread_initial_thread;
else if (sp >= __pthread_manager_thread_bos
&& sp < __pthread_manager_thread_tos)
return &__pthread_manager_thread;
else if (__pthread_nonstandard_stacks)
return __pthread_find_self();
else
#ifdef _STACK_GROWS_DOWN
return (pthread_descr)(((unsigned long)sp | (STACK_SIZE-1))+1) - 1;
#else
return (pthread_descr)((unsigned long)sp &~ (STACK_SIZE-1));
#endif
#endif
}
/* If MEMORY_BARRIER isn't defined in pt-machine.h, assume the architecture
doesn't need a memory barrier instruction (e.g. Intel x86). Some
architectures distinguish between full, read and write barriers. */
#ifndef MEMORY_BARRIER
#define MEMORY_BARRIER()
#endif
#ifndef READ_MEMORY_BARRIER
#define READ_MEMORY_BARRIER() MEMORY_BARRIER()
#endif
#ifndef WRITE_MEMORY_BARRIER
#define WRITE_MEMORY_BARRIER() MEMORY_BARRIER()
#endif
/* Max number of times we must spin on a spinlock calling sched_yield().
After MAX_SPIN_COUNT iterations, we put the calling thread to sleep. */
#ifndef MAX_SPIN_COUNT
#define MAX_SPIN_COUNT 50
#endif
/* Max number of times the spinlock in the adaptive mutex implementation
spins actively on SMP systems. */
#ifndef MAX_ADAPTIVE_SPIN_COUNT
#define MAX_ADAPTIVE_SPIN_COUNT 100
#endif
/* Duration of sleep (in nanoseconds) when we can't acquire a spinlock
after MAX_SPIN_COUNT iterations of sched_yield().
With the 2.0 and 2.1 kernels, this MUST BE > 2ms.
(Otherwise the kernel does busy-waiting for realtime threads,
giving other threads no chance to run.) */
#ifndef SPIN_SLEEP_DURATION
#define SPIN_SLEEP_DURATION 2000001
#endif
/* Debugging */
#ifdef DEBUG
#include <assert.h>
#define ASSERT assert
#define MSG __pthread_message
#else
#define ASSERT(x)
#define MSG(msg,arg...)
#endif
/* Internal global functions */
extern void __pthread_do_exit (void *retval, char *currentframe)
__attribute__ ((__noreturn__));
extern void __pthread_destroy_specifics (void);
extern void __pthread_perform_cleanup (char *currentframe);
extern void __pthread_init_max_stacksize (void);
extern int __pthread_initialize_manager (void);
extern void __pthread_message (char * fmt, ...);
extern int __pthread_manager (void *reqfd);
extern int __pthread_manager_event (void *reqfd);
extern void __pthread_manager_sighandler (int sig);
extern void __pthread_reset_main_thread (void);
extern void __pthread_once_fork_prepare (void);
extern void __pthread_once_fork_parent (void);
extern void __pthread_once_fork_child (void);
extern void __flockfilelist (void);
extern void __funlockfilelist (void);
extern void __fresetlockfiles (void);
extern void __pthread_manager_adjust_prio (int thread_prio);
extern void __pthread_initialize_minimal (void);
extern int __pthread_attr_setguardsize (pthread_attr_t *__attr,
size_t __guardsize);
extern int __pthread_attr_getguardsize (const pthread_attr_t *__attr,
size_t *__guardsize);
extern int __pthread_attr_setstackaddr (pthread_attr_t *__attr,
void *__stackaddr);
extern int __pthread_attr_getstackaddr (const pthread_attr_t *__attr,
void **__stackaddr);
extern int __pthread_attr_setstacksize (pthread_attr_t *__attr,
size_t __stacksize);
extern int __pthread_attr_getstacksize (const pthread_attr_t *__attr,
size_t *__stacksize);
extern int __pthread_attr_setstack (pthread_attr_t *__attr, void *__stackaddr,
size_t __stacksize);
extern int __pthread_attr_getstack (const pthread_attr_t *__attr, void **__stackaddr,
size_t *__stacksize);
extern int __pthread_getconcurrency (void);
extern int __pthread_setconcurrency (int __level);
extern int __pthread_mutex_timedlock (pthread_mutex_t *__mutex,
const struct timespec *__abstime);
extern int __pthread_mutexattr_getpshared (const pthread_mutexattr_t *__attr,
int *__pshared);
extern int __pthread_mutexattr_setpshared (pthread_mutexattr_t *__attr,
int __pshared);
extern int __pthread_mutexattr_gettype (const pthread_mutexattr_t *__attr,
int *__kind);
extern void __pthread_kill_other_threads_np (void);
extern void __pthread_restart_old(pthread_descr th);
extern void __pthread_suspend_old(pthread_descr self);
extern int __pthread_timedsuspend_old(pthread_descr self, const struct timespec *abs);
extern void __pthread_restart_new(pthread_descr th);
extern void __pthread_suspend_new(pthread_descr self);
extern int __pthread_timedsuspend_new(pthread_descr self, const struct timespec *abs);
extern void __pthread_wait_for_restart_signal(pthread_descr self);
extern int __pthread_yield (void);
extern int __pthread_rwlock_timedrdlock (pthread_rwlock_t *__restrict __rwlock,
__const struct timespec *__restrict
__abstime);
extern int __pthread_rwlock_timedwrlock (pthread_rwlock_t *__restrict __rwlock,
__const struct timespec *__restrict
__abstime);
extern int __pthread_rwlockattr_destroy (pthread_rwlockattr_t *__attr);
extern int __pthread_barrierattr_getpshared (__const pthread_barrierattr_t *
__restrict __attr,
int *__restrict __pshared);
extern int __pthread_spin_lock (pthread_spinlock_t *__lock);
extern int __pthread_spin_trylock (pthread_spinlock_t *__lock);
extern int __pthread_spin_unlock (pthread_spinlock_t *__lock);
extern int __pthread_spin_init (pthread_spinlock_t *__lock, int __pshared);
extern int __pthread_spin_destroy (pthread_spinlock_t *__lock);
extern int __pthread_clock_gettime (hp_timing_t freq, struct timespec *tp);
extern void __pthread_clock_settime (hp_timing_t offset);
/* Global pointers to old or new suspend functions */
extern void (*__pthread_restart)(pthread_descr);
extern void (*__pthread_suspend)(pthread_descr);
extern int (*__pthread_timedsuspend)(pthread_descr, const struct timespec *);
/* Prototypes for the function without cancelation support when the
normal version has it. */
extern int __libc_close (int fd);
extern int __libc_nanosleep (const struct timespec *requested_time,
struct timespec *remaining);
/* Prototypes for some of the new semaphore functions. */
extern int __new_sem_post (sem_t * sem);
extern int __new_sem_init (sem_t *__sem, int __pshared, unsigned int __value);
extern int __new_sem_wait (sem_t *__sem);
extern int __new_sem_trywait (sem_t *__sem);
extern int __new_sem_getvalue (sem_t *__restrict __sem, int *__restrict __sval);
extern int __new_sem_destroy (sem_t *__sem);
/* Prototypes for compatibility functions. */
extern int __pthread_attr_init_2_1 (pthread_attr_t *__attr);
extern int __pthread_attr_init_2_0 (pthread_attr_t *__attr);
extern int __pthread_create_2_1 (pthread_t *__restrict __thread,
const pthread_attr_t *__attr,
void *(*__start_routine) (void *),
void *__restrict __arg);
extern int __pthread_create_2_0 (pthread_t *__restrict thread,
const pthread_attr_t *__attr,
void *(*__start_routine) (void *),
void *__restrict arg);
/* The functions called the signal events. */
extern void __linuxthreads_create_event (void);
extern void __linuxthreads_death_event (void);
extern void __linuxthreads_reap_event (void);
/* This function is called to initialize the pthread library. */
extern void __pthread_initialize (void);
#endif /* internals.h */
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