/
nerfur
/
openbsd-src
Обзор
Документация
Войти
/
nerfur
/
openbsd-src
Код
Запросы
0
Задачи
Вики
Пакеты
0
Релизы
0
Аналитика
Безопасность
master
lib/libc/include/thread_private.h
427 строк
12 KB
guenther
Use struct __sFILE instead of FILE in thread locking callback
18 авг 2024, 05:25
18 авг 2024, 05:25
076a4f8
Код
Авторство
О чём код?
/* $OpenBSD: thread_private.h,v 1.37 2024/08/18 02:25:51 guenther Exp $ */ /* PUBLIC DOMAIN: No Rights Reserved. Marco S Hyman <marc@snafu.org> */ #ifndef _THREAD_PRIVATE_H_ #define _THREAD_PRIVATE_H_ extern int __isthreaded; #define _MALLOC_MUTEXES 32 void _malloc_init(int); #ifdef __LIBC__ PROTO_NORMAL(_malloc_init); #endif /* __LIBC__ */ /* * The callbacks needed by libc to handle the threaded case. * NOTE: Bump the version when you change the struct contents! * * tc_canceled: * If not NULL, what to do when canceled (otherwise _exit(0)) * * tc_flockfile, tc_ftrylockfile, and tc_funlockfile: * If not NULL, these implement the flockfile() family. * XXX In theory, you should be able to lock a FILE before * XXX loading libpthread and have that be a real lock on it, * XXX but that doesn't work without the libc base version * XXX tracking the recursion count. * * tc_malloc_lock and tc_malloc_unlock: * tc_atexit_lock and tc_atexit_unlock: * tc_atfork_lock and tc_atfork_unlock: * tc_arc4_lock and tc_arc4_unlock: * The locks used by the malloc, atexit, atfork, and arc4 subsystems. * These have to be ordered specially in the fork/vfork wrappers * and may be implemented differently than the general mutexes * in the callbacks below. * * tc_mutex_lock and tc_mutex_unlock: * Lock and unlock the given mutex. If the given mutex is NULL * a mutex is allocated and initialized automatically. * * tc_mutex_destroy: * Destroy/deallocate the given mutex. * * tc_tag_lock and tc_tag_unlock: * Lock and unlock the mutex associated with the given tag. * If the given tag is NULL a tag is allocated and initialized * automatically. * * tc_tag_storage: * Returns a pointer to per-thread instance of data associated * with the given tag. If the given tag is NULL a tag is * allocated and initialized automatically. * * tc_fork, tc_vfork: * If not NULL, they are called instead of the syscall stub, so that * the thread library can do necessary locking and reinitialization. * * tc_thread_release: * Handles the release of a thread's TIB and struct pthread and the * notification of other threads...when there are other threads. * * tc_thread_key_zero: * For each thread, zero out the key data associated with the given key. * If <machine/tcb.h> doesn't define TCB_GET(), then locating the TCB in a * threaded process requires a syscall (__get_tcb(2)) which is too much * overhead for single-threaded processes. For those archs, there are two * additional callbacks, though they are placed first in the struct for * convenience in ASM: * * tc_errnoptr: * Returns the address of the thread's errno. * * tc_tcb: * Returns the address of the thread's TCB. */ struct __sFILE; struct pthread; struct thread_callbacks { int *(*tc_errnoptr)(void); /* MUST BE FIRST */ void *(*tc_tcb)(void); __dead void (*tc_canceled)(void); void (*tc_flockfile)(struct __sFILE *); int (*tc_ftrylockfile)(struct __sFILE *); void (*tc_funlockfile)(struct __sFILE *); void (*tc_malloc_lock)(int); void (*tc_malloc_unlock)(int); void (*tc_atexit_lock)(void); void (*tc_atexit_unlock)(void); void (*tc_atfork_lock)(void); void (*tc_atfork_unlock)(void); void (*tc_arc4_lock)(void); void (*tc_arc4_unlock)(void); void (*tc_mutex_lock)(void **); void (*tc_mutex_unlock)(void **); void (*tc_mutex_destroy)(void **); void (*tc_tag_lock)(void **); void (*tc_tag_unlock)(void **); void *(*tc_tag_storage)(void **, void *, size_t, void (*)(void *), void *); __pid_t (*tc_fork)(void); __pid_t (*tc_vfork)(void); void (*tc_thread_release)(struct pthread *); void (*tc_thread_key_zero)(int); }; __BEGIN_PUBLIC_DECLS /* * Set the callbacks used by libc */ void _thread_set_callbacks(const struct thread_callbacks *_cb, size_t _len); __END_PUBLIC_DECLS #ifdef __LIBC__ __BEGIN_HIDDEN_DECLS /* the current set */ extern struct thread_callbacks _thread_cb; __END_HIDDEN_DECLS #endif /* __LIBC__ */ /* * helper macro to make unique names in the thread namespace */ #define __THREAD_NAME(name) __CONCAT(_thread_tagname_,name) /* * Macros used in libc to access thread mutex, keys, and per thread storage. * _THREAD_PRIVATE_KEY and _THREAD_PRIVATE_MUTEX are different macros for * historical reasons. They do the same thing, define a static variable * keyed by 'name' that identifies a mutex and a key to identify per thread * data. */ #define _THREAD_PRIVATE_KEY(name) \ static void *__THREAD_NAME(name) #define _THREAD_PRIVATE_MUTEX(name) \ static void *__THREAD_NAME(name) #ifndef __LIBC__ /* building some sort of reach around */ #define _THREAD_PRIVATE_MUTEX_LOCK(name) do {} while (0) #define _THREAD_PRIVATE_MUTEX_UNLOCK(name) do {} while (0) #define _THREAD_PRIVATE(keyname, storage, error) &(storage) #define _THREAD_PRIVATE_DT(keyname, storage, dt, error) &(storage) #define _MUTEX_LOCK(mutex) do {} while (0) #define _MUTEX_UNLOCK(mutex) do {} while (0) #define _MUTEX_DESTROY(mutex) do {} while (0) #define _MALLOC_LOCK(n) do {} while (0) #define _MALLOC_UNLOCK(n) do {} while (0) #define _ATEXIT_LOCK() do {} while (0) #define _ATEXIT_UNLOCK() do {} while (0) #define _ATFORK_LOCK() do {} while (0) #define _ATFORK_UNLOCK() do {} while (0) #define _ARC4_LOCK() do {} while (0) #define _ARC4_UNLOCK() do {} while (0) #else /* building libc */ #define _THREAD_PRIVATE_MUTEX_LOCK(name) \ do { \ if (_thread_cb.tc_tag_lock != NULL) \ _thread_cb.tc_tag_lock(&(__THREAD_NAME(name))); \ } while (0) #define _THREAD_PRIVATE_MUTEX_UNLOCK(name) \ do { \ if (_thread_cb.tc_tag_unlock != NULL) \ _thread_cb.tc_tag_unlock(&(__THREAD_NAME(name))); \ } while (0) #define _THREAD_PRIVATE(keyname, storage, error) \ (_thread_cb.tc_tag_storage == NULL ? &(storage) : \ _thread_cb.tc_tag_storage(&(__THREAD_NAME(keyname)), \ &(storage), sizeof(storage), NULL, (error))) #define _THREAD_PRIVATE_DT(keyname, storage, dt, error) \ (_thread_cb.tc_tag_storage == NULL ? &(storage) : \ _thread_cb.tc_tag_storage(&(__THREAD_NAME(keyname)), \ &(storage), sizeof(storage), (dt), (error))) /* * Macros used in libc to access mutexes. */ #define _MUTEX_LOCK(mutex) \ do { \ if (__isthreaded) \ _thread_cb.tc_mutex_lock(mutex); \ } while (0) #define _MUTEX_UNLOCK(mutex) \ do { \ if (__isthreaded) \ _thread_cb.tc_mutex_unlock(mutex); \ } while (0) #define _MUTEX_DESTROY(mutex) \ do { \ if (__isthreaded) \ _thread_cb.tc_mutex_destroy(mutex); \ } while (0) /* * malloc lock/unlock prototypes and definitions */ #define _MALLOC_LOCK(n) \ do { \ if (__isthreaded) \ _thread_cb.tc_malloc_lock(n); \ } while (0) #define _MALLOC_UNLOCK(n) \ do { \ if (__isthreaded) \ _thread_cb.tc_malloc_unlock(n); \ } while (0) #define _ATEXIT_LOCK() \ do { \ if (__isthreaded) \ _thread_cb.tc_atexit_lock(); \ } while (0) #define _ATEXIT_UNLOCK() \ do { \ if (__isthreaded) \ _thread_cb.tc_atexit_unlock(); \ } while (0) #define _ATFORK_LOCK() \ do { \ if (__isthreaded) \ _thread_cb.tc_atfork_lock(); \ } while (0) #define _ATFORK_UNLOCK() \ do { \ if (__isthreaded) \ _thread_cb.tc_atfork_unlock(); \ } while (0) #define _ARC4_LOCK() \ do { \ if (__isthreaded) \ _thread_cb.tc_arc4_lock(); \ } while (0) #define _ARC4_UNLOCK() \ do { \ if (__isthreaded) \ _thread_cb.tc_arc4_unlock(); \ } while (0) #endif /* __LIBC__ */ /* * Copyright (c) 2004,2005 Ted Unangst <tedu@openbsd.org> * All Rights Reserved. * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ /* * Private data structures that back up the typedefs in pthread.h. * Since only the thread library cares about their size or arrangement, * it should be possible to switch libraries without relinking. * * Do not reorder _atomic_lock_t and sem_t variables in the structs. * This is due to alignment requirements of certain arches like hppa. * The current requirement is 16 bytes. * * THE MACHINE DEPENDENT CERROR CODE HAS HARD CODED OFFSETS INTO PTHREAD_T! */ #include <sys/queue.h> #include <pthread.h> #include <semaphore.h> #include <machine/spinlock.h> #define _SPINLOCK_UNLOCKED _ATOMIC_LOCK_UNLOCKED struct __sem { _atomic_lock_t lock; volatile int waitcount; volatile int value; int shared; }; TAILQ_HEAD(pthread_queue, pthread); #ifdef FUTEX struct pthread_mutex { volatile unsigned int lock; int type; pthread_t owner; int count; int prioceiling; }; struct pthread_cond { volatile unsigned int seq; clockid_t clock; struct pthread_mutex *mutex; }; struct pthread_rwlock { volatile unsigned int value; }; #else struct pthread_mutex { _atomic_lock_t lock; struct pthread_queue lockers; int type; pthread_t owner; int count; int prioceiling; }; struct pthread_cond { _atomic_lock_t lock; struct pthread_queue waiters; struct pthread_mutex *mutex; clockid_t clock; }; struct pthread_rwlock { _atomic_lock_t lock; pthread_t owner; struct pthread_queue writers; int readers; }; #endif /* FUTEX */ struct pthread_mutex_attr { int ma_type; int ma_protocol; int ma_prioceiling; }; struct pthread_cond_attr { clockid_t ca_clock; }; struct pthread_attr { void *stack_addr; size_t stack_size; size_t guard_size; int detach_state; int contention_scope; int sched_policy; struct sched_param sched_param; int sched_inherit; }; struct rthread_storage { int keyid; struct rthread_storage *next; void *data; }; struct rthread_cleanup_fn { void (*fn)(void *); void *arg; struct rthread_cleanup_fn *next; }; struct tib; struct stack; struct pthread { struct __sem donesem; unsigned int flags; _atomic_lock_t flags_lock; struct tib *tib; void *retval; void *(*fn)(void *); void *arg; char name[32]; struct stack *stack; LIST_ENTRY(pthread) threads; TAILQ_ENTRY(pthread) waiting; pthread_cond_t blocking_cond; struct pthread_attr attr; struct rthread_storage *local_storage; struct rthread_cleanup_fn *cleanup_fns; /* cancel received in a delayed cancel block? */ int delayed_cancel; }; /* flags in pthread->flags */ #define THREAD_DONE 0x001 #define THREAD_DETACHED 0x002 /* flags in tib->tib_thread_flags */ #define TIB_THREAD_ASYNC_CANCEL 0x001 #define TIB_THREAD_INITIAL_STACK 0x002 /* has stack from exec */ #define ENTER_DELAYED_CANCEL_POINT(tib, self) \ (self)->delayed_cancel = 0; \ ENTER_CANCEL_POINT_INNER(tib, 1, 1) /* * Internal functions exported from libc's thread bits for use by libpthread */ void _spinlock(volatile _atomic_lock_t *); int _spinlocktry(volatile _atomic_lock_t *); void _spinunlock(volatile _atomic_lock_t *); void _rthread_debug(int, const char *, ...) __attribute__((__format__ (printf, 2, 3))); pid_t _thread_dofork(pid_t (*_sys_fork)(void)); void _thread_finalize(void); /* * Threading syscalls not declared in system headers */ __dead void __threxit(pid_t *); int __thrsleep(const volatile void *, clockid_t, const struct timespec *, volatile void *, const int *); int __thrwakeup(const volatile void *, int n); int __thrsigdivert(sigset_t, siginfo_t *, const struct timespec *); #endif /* _THREAD_PRIVATE_H_ */