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glibc/sysdeps/nptl/pthreadP.h
Adhemerval Zanella d40ac01cbb stdlib: Make abort/_Exit AS-safe (BZ 26275) 
The recursive lock used on abort does not synchronize with a new process
creation (either by fork-like interfaces or posix_spawn ones), nor it
is reinitialized after fork().

Also, the SIGABRT unblock before raise() shows another race condition,
where a fork or posix_spawn() call by another thread, just after the
recursive lock release and before the SIGABRT signal, might create
programs with a non-expected signal mask.  With the default option
(without POSIX_SPAWN_SETSIGDEF), the process can see SIG_DFL for
SIGABRT, where it should be SIG_IGN.

To fix the AS-safe, raise() does not change the process signal mask,
and an AS-safe lock is used if a SIGABRT is installed or the process
is blocked or ignored.  With the signal mask change removal,
there is no need to use a recursive loc.  The lock is also taken on
both _Fork() and posix_spawn(), to avoid the spawn process to see the
abort handler as SIG_DFL.

A read-write lock is used to avoid serialize _Fork and posix_spawn
execution.  Both sigaction (SIGABRT) and abort() requires to lock
as writer (since both change the disposition).

The fallback is also simplified: there is no need to use a loop of
ABORT_INSTRUCTION after _exit() (if the syscall does not terminate the
process, the system is broken).

The proposed fix changes how setjmp works on a SIGABRT handler, where
glibc does not save the signal mask.  So usage like the below will now
always abort.

  static volatile int chk_fail_ok;
  static jmp_buf chk_fail_buf;

  static void
  handler (int sig)
  {
    if (chk_fail_ok)
      {
        chk_fail_ok = 0;
        longjmp (chk_fail_buf, 1);
      }
    else
      _exit (127);
  }
  [...]
  signal (SIGABRT, handler);
  [....]
  chk_fail_ok = 1;
  if (! setjmp (chk_fail_buf))
    {
      // Something that can calls abort, like a failed fortify function.
      chk_fail_ok = 0;
      printf ("FAIL\n");
    }

Such cases will need to use sigsetjmp instead.

The _dl_start_profile calls sigaction through _profil, and to avoid
pulling abort() on loader the call is replaced with __libc_sigaction.

Checked on x86_64-linux-gnu and aarch64-linux-gnu.

Reviewed-by: DJ Delorie <dj@redhat.com>
2024-10-08 14:40:12 -03:00

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/* Copyright (C) 2002-2024 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#ifndef _PTHREADP_H
#define _PTHREADP_H 1
#define __PTHREAD_NPTL
#include <pthread.h>
#include <setjmp.h>
#include <stdbool.h>
#include <sys/syscall.h>
#include <nptl/descr.h>
#include <tls.h>
#include <lowlevellock.h>
#include <stackinfo.h>
#include <internaltypes.h>
#include <atomic.h>
#include <kernel-features.h>
#include <errno.h>
#include <internal-signals.h>
#include <pthread_mutex_backoff.h>
#include "pthread_mutex_conf.h"
/* Atomic operations on TLS memory. */
#ifndef THREAD_ATOMIC_CMPXCHG_VAL
# define THREAD_ATOMIC_CMPXCHG_VAL(descr, member, new, old) \
atomic_compare_and_exchange_val_acq (&(descr)->member, new, old)
#endif
static inline short max_adaptive_count (void)
{
return __mutex_aconf.spin_count;
}
/* Magic cookie representing robust mutex with dead owner. */
#define PTHREAD_MUTEX_INCONSISTENT INT_MAX
/* Magic cookie representing not recoverable robust mutex. */
#define PTHREAD_MUTEX_NOTRECOVERABLE (INT_MAX - 1)
/* Internal mutex type value. */
enum
{
PTHREAD_MUTEX_KIND_MASK_NP = 3,
PTHREAD_MUTEX_ELISION_NP = 256,
PTHREAD_MUTEX_NO_ELISION_NP = 512,
PTHREAD_MUTEX_ROBUST_NORMAL_NP = 16,
PTHREAD_MUTEX_ROBUST_RECURSIVE_NP
= PTHREAD_MUTEX_ROBUST_NORMAL_NP | PTHREAD_MUTEX_RECURSIVE_NP,
PTHREAD_MUTEX_ROBUST_ERRORCHECK_NP
= PTHREAD_MUTEX_ROBUST_NORMAL_NP | PTHREAD_MUTEX_ERRORCHECK_NP,
PTHREAD_MUTEX_ROBUST_ADAPTIVE_NP
= PTHREAD_MUTEX_ROBUST_NORMAL_NP | PTHREAD_MUTEX_ADAPTIVE_NP,
PTHREAD_MUTEX_PRIO_INHERIT_NP = 32,
PTHREAD_MUTEX_PI_NORMAL_NP
= PTHREAD_MUTEX_PRIO_INHERIT_NP | PTHREAD_MUTEX_NORMAL,
PTHREAD_MUTEX_PI_RECURSIVE_NP
= PTHREAD_MUTEX_PRIO_INHERIT_NP | PTHREAD_MUTEX_RECURSIVE_NP,
PTHREAD_MUTEX_PI_ERRORCHECK_NP
= PTHREAD_MUTEX_PRIO_INHERIT_NP | PTHREAD_MUTEX_ERRORCHECK_NP,
PTHREAD_MUTEX_PI_ADAPTIVE_NP
= PTHREAD_MUTEX_PRIO_INHERIT_NP | PTHREAD_MUTEX_ADAPTIVE_NP,
PTHREAD_MUTEX_PI_ROBUST_NORMAL_NP
= PTHREAD_MUTEX_PRIO_INHERIT_NP | PTHREAD_MUTEX_ROBUST_NORMAL_NP,
PTHREAD_MUTEX_PI_ROBUST_RECURSIVE_NP
= PTHREAD_MUTEX_PRIO_INHERIT_NP | PTHREAD_MUTEX_ROBUST_RECURSIVE_NP,
PTHREAD_MUTEX_PI_ROBUST_ERRORCHECK_NP
= PTHREAD_MUTEX_PRIO_INHERIT_NP | PTHREAD_MUTEX_ROBUST_ERRORCHECK_NP,
PTHREAD_MUTEX_PI_ROBUST_ADAPTIVE_NP
= PTHREAD_MUTEX_PRIO_INHERIT_NP | PTHREAD_MUTEX_ROBUST_ADAPTIVE_NP,
PTHREAD_MUTEX_PRIO_PROTECT_NP = 64,
PTHREAD_MUTEX_PP_NORMAL_NP
= PTHREAD_MUTEX_PRIO_PROTECT_NP | PTHREAD_MUTEX_NORMAL,
PTHREAD_MUTEX_PP_RECURSIVE_NP
= PTHREAD_MUTEX_PRIO_PROTECT_NP | PTHREAD_MUTEX_RECURSIVE_NP,
PTHREAD_MUTEX_PP_ERRORCHECK_NP
= PTHREAD_MUTEX_PRIO_PROTECT_NP | PTHREAD_MUTEX_ERRORCHECK_NP,
PTHREAD_MUTEX_PP_ADAPTIVE_NP
= PTHREAD_MUTEX_PRIO_PROTECT_NP | PTHREAD_MUTEX_ADAPTIVE_NP,
PTHREAD_MUTEX_ELISION_FLAGS_NP
= PTHREAD_MUTEX_ELISION_NP | PTHREAD_MUTEX_NO_ELISION_NP,
PTHREAD_MUTEX_TIMED_ELISION_NP =
PTHREAD_MUTEX_TIMED_NP | PTHREAD_MUTEX_ELISION_NP,
PTHREAD_MUTEX_TIMED_NO_ELISION_NP =
PTHREAD_MUTEX_TIMED_NP | PTHREAD_MUTEX_NO_ELISION_NP,
};
#define PTHREAD_MUTEX_PSHARED_BIT 128
/* See concurrency notes regarding __kind in struct __pthread_mutex_s
in sysdeps/nptl/bits/thread-shared-types.h. */
#define PTHREAD_MUTEX_TYPE(m) \
(atomic_load_relaxed (&((m)->__data.__kind)) & 127)
/* Don't include NO_ELISION, as that type is always the same
as the underlying lock type. */
#define PTHREAD_MUTEX_TYPE_ELISION(m) \
(atomic_load_relaxed (&((m)->__data.__kind)) \
& (127 | PTHREAD_MUTEX_ELISION_NP))
#if LLL_PRIVATE == 0 && LLL_SHARED == 128
# define PTHREAD_MUTEX_PSHARED(m) \
(atomic_load_relaxed (&((m)->__data.__kind)) & 128)
#else
# define PTHREAD_MUTEX_PSHARED(m) \
((atomic_load_relaxed (&((m)->__data.__kind)) & 128) \
? LLL_SHARED : LLL_PRIVATE)
#endif
/* The kernel when waking robust mutexes on exit never uses
FUTEX_PRIVATE_FLAG FUTEX_WAKE. */
#define PTHREAD_ROBUST_MUTEX_PSHARED(m) LLL_SHARED
/* Ceiling in __data.__lock. __data.__lock is signed, so don't
use the MSB bit in there, but in the mask also include that bit,
so that the compiler can optimize & PTHREAD_MUTEX_PRIO_CEILING_MASK
masking if the value is then shifted down by
PTHREAD_MUTEX_PRIO_CEILING_SHIFT. */
#define PTHREAD_MUTEX_PRIO_CEILING_SHIFT 19
#define PTHREAD_MUTEX_PRIO_CEILING_MASK 0xfff80000
/* Flags in mutex attr. */
#define PTHREAD_MUTEXATTR_PROTOCOL_SHIFT 28
#define PTHREAD_MUTEXATTR_PROTOCOL_MASK 0x30000000
#define PTHREAD_MUTEXATTR_PRIO_CEILING_SHIFT 12
#define PTHREAD_MUTEXATTR_PRIO_CEILING_MASK 0x00fff000
#define PTHREAD_MUTEXATTR_FLAG_ROBUST 0x40000000
#define PTHREAD_MUTEXATTR_FLAG_PSHARED 0x80000000
#define PTHREAD_MUTEXATTR_FLAG_BITS \
(PTHREAD_MUTEXATTR_FLAG_ROBUST | PTHREAD_MUTEXATTR_FLAG_PSHARED \
| PTHREAD_MUTEXATTR_PROTOCOL_MASK | PTHREAD_MUTEXATTR_PRIO_CEILING_MASK)
/* For the following, see pthread_rwlock_common.c. */
#define PTHREAD_RWLOCK_WRPHASE 1
#define PTHREAD_RWLOCK_WRLOCKED 2
#define PTHREAD_RWLOCK_RWAITING 4
#define PTHREAD_RWLOCK_READER_SHIFT 3
#define PTHREAD_RWLOCK_READER_OVERFLOW ((unsigned int) 1 \
<< (sizeof (unsigned int) * 8 - 1))
#define PTHREAD_RWLOCK_WRHANDOVER ((unsigned int) 1 \
<< (sizeof (unsigned int) * 8 - 1))
#define PTHREAD_RWLOCK_FUTEX_USED 2
/* Bits used in robust mutex implementation. */
#define FUTEX_WAITERS 0x80000000
#define FUTEX_OWNER_DIED 0x40000000
#define FUTEX_TID_MASK 0x3fffffff
/* pthread_once definitions. See __pthread_once for how these are used. */
#define __PTHREAD_ONCE_INPROGRESS 1
#define __PTHREAD_ONCE_DONE 2
#define __PTHREAD_ONCE_FORK_GEN_INCR 4
/* Attribute to indicate thread creation was issued from C11 thrd_create. */
#define ATTR_C11_THREAD ((void*)(uintptr_t)-1)
/* Condition variable definitions. See __pthread_cond_wait_common.
Need to be defined here so there is one place from which
nptl_lock_constants can grab them. */
#define __PTHREAD_COND_CLOCK_MONOTONIC_MASK 2
#define __PTHREAD_COND_SHARED_MASK 1
/* Internal variables. */
/* Default pthread attributes. */
extern union pthread_attr_transparent __default_pthread_attr;
libc_hidden_proto (__default_pthread_attr)
extern int __default_pthread_attr_lock;
libc_hidden_proto (__default_pthread_attr_lock)
/* Called from __libc_freeres to deallocate the default attribute. */
extern void __default_pthread_attr_freeres (void) attribute_hidden;
/* Attribute handling. */
extern struct pthread_attr *__attr_list attribute_hidden;
extern int __attr_list_lock attribute_hidden;
/* Concurrency handling. */
extern int __concurrency_level attribute_hidden;
/* Thread-local data key handling. */
extern struct pthread_key_struct __pthread_keys[PTHREAD_KEYS_MAX];
libc_hidden_proto (__pthread_keys)
/* Number of threads running. */
extern unsigned int __nptl_nthreads;
libc_hidden_proto (__nptl_nthreads)
#ifndef __ASSUME_SET_ROBUST_LIST
/* True if the set_robust_list system call works. Initialized in
__tls_init_tp. */
extern bool __nptl_set_robust_list_avail;
rtld_hidden_proto (__nptl_set_robust_list_avail)
#endif
/* Thread Priority Protection. */
extern int __sched_fifo_min_prio;
libc_hidden_proto (__sched_fifo_min_prio)
extern int __sched_fifo_max_prio;
libc_hidden_proto (__sched_fifo_max_prio)
extern void __init_sched_fifo_prio (void);
libc_hidden_proto (__init_sched_fifo_prio)
extern int __pthread_tpp_change_priority (int prev_prio, int new_prio);
libc_hidden_proto (__pthread_tpp_change_priority)
extern int __pthread_current_priority (void);
libc_hidden_proto (__pthread_current_priority)
/* This will not catch all invalid descriptors but is better than
nothing. And if the test triggers the thread descriptor is
guaranteed to be invalid. */
#define INVALID_TD_P(pd) __builtin_expect ((pd)->tid <= 0, 0)
#define INVALID_NOT_TERMINATED_TD_P(pd) __builtin_expect ((pd)->tid < 0, 0)
extern void __pthread_unwind (__pthread_unwind_buf_t *__buf)
__cleanup_fct_attribute __attribute ((__noreturn__))
#if !defined SHARED && !IS_IN (libpthread)
weak_function
#endif
;
libc_hidden_proto (__pthread_unwind)
extern void __pthread_unwind_next (__pthread_unwind_buf_t *__buf)
__cleanup_fct_attribute __attribute ((__noreturn__))
#ifndef SHARED
weak_function
#endif
;
/* NB: No hidden proto for __pthread_unwind_next: inside glibc, the
legacy unwinding mechanism is used. */
extern void __pthread_register_cancel (__pthread_unwind_buf_t *__buf)
__cleanup_fct_attribute;
libc_hidden_proto (__pthread_register_cancel)
extern void __pthread_unregister_cancel (__pthread_unwind_buf_t *__buf)
__cleanup_fct_attribute;
libc_hidden_proto (__pthread_unregister_cancel)
/* Called when a thread reacts on a cancellation request. */
static inline void
__attribute ((noreturn, always_inline))
__do_cancel (void *result)
{
struct pthread *self = THREAD_SELF;
self->result = result;
/* Make sure we get no more cancellations. */
atomic_fetch_or_relaxed (&self->cancelhandling, EXITING_BITMASK);
__pthread_unwind ((__pthread_unwind_buf_t *)
THREAD_GETMEM (self, cleanup_jmp_buf));
}
extern long int __syscall_cancel_arch (volatile int *, __syscall_arg_t nr,
__syscall_arg_t arg1, __syscall_arg_t arg2, __syscall_arg_t arg3,
__syscall_arg_t arg4, __syscall_arg_t arg5, __syscall_arg_t arg6
__SYSCALL_CANCEL7_ARCH_ARG_DEF) attribute_hidden;
extern _Noreturn void __syscall_do_cancel (void) attribute_hidden;
/* Internal prototypes. */
/* Deallocate a thread's stack after optionally making sure the thread
descriptor is still valid. */
extern void __nptl_free_tcb (struct pthread *pd);
libc_hidden_proto (__nptl_free_tcb)
/* Change the permissions of a thread stack. Called from
_dl_make_stacks_executable and pthread_create. */
int
__nptl_change_stack_perm (struct pthread *pd);
rtld_hidden_proto (__nptl_change_stack_perm)
/* longjmp handling. */
extern void __pthread_cleanup_upto (__jmp_buf target, char *targetframe);
libc_hidden_proto (__pthread_cleanup_upto)
/* Functions with versioned interfaces. */
extern int __pthread_create (pthread_t *newthread,
const pthread_attr_t *attr,
void *(*start_routine) (void *), void *arg);
libc_hidden_proto (__pthread_create)
extern int __pthread_create_2_0 (pthread_t *newthread,
const pthread_attr_t *attr,
void *(*start_routine) (void *), void *arg);
extern int __pthread_attr_init (pthread_attr_t *attr);
libc_hidden_proto (__pthread_attr_init)
extern int __pthread_attr_init_2_0 (pthread_attr_t *attr);
/* Part of the legacy thread events interface (which has been
superseded by PTRACE_O_TRACECLONE). This can be set by the
debugger before initialization is complete. */
extern bool __nptl_initial_report_events;
rtld_hidden_proto (__nptl_initial_report_events)
/* Event handlers for libthread_db interface. */
extern void __nptl_create_event (void);
extern void __nptl_death_event (void);
libc_hidden_proto (__nptl_create_event)
libc_hidden_proto (__nptl_death_event)
/* The fork generation counter, defined in libpthread. */
extern unsigned long int __fork_generation attribute_hidden;
/* Pointer to the fork generation counter in the thread library. */
extern unsigned long int *__fork_generation_pointer attribute_hidden;
extern size_t __pthread_get_minstack (const pthread_attr_t *attr);
libc_hidden_proto (__pthread_get_minstack)
/* Namespace save aliases. */
extern int __pthread_getschedparam (pthread_t thread_id, int *policy,
struct sched_param *param);
libc_hidden_proto (__pthread_getschedparam)
extern int __pthread_setschedparam (pthread_t thread_id, int policy,
const struct sched_param *param);
extern int __pthread_mutex_init (pthread_mutex_t *__mutex,
const pthread_mutexattr_t *__mutexattr);
libc_hidden_proto (__pthread_mutex_init)
extern int __pthread_mutex_destroy (pthread_mutex_t *__mutex);
libc_hidden_proto (__pthread_mutex_destroy)
extern int __pthread_mutex_trylock (pthread_mutex_t *_mutex);
libc_hidden_proto (__pthread_mutex_trylock)
extern int __pthread_mutex_lock (pthread_mutex_t *__mutex);
libc_hidden_proto (__pthread_mutex_lock)
extern int __pthread_mutex_timedlock (pthread_mutex_t *__mutex,
const struct timespec *__abstime);
extern int __pthread_mutex_cond_lock (pthread_mutex_t *__mutex)
attribute_hidden;
extern void __pthread_mutex_cond_lock_adjust (pthread_mutex_t *__mutex)
attribute_hidden;
extern int __pthread_mutex_unlock (pthread_mutex_t *__mutex);
libc_hidden_proto (__pthread_mutex_unlock)
extern int __pthread_mutex_unlock_usercnt (pthread_mutex_t *__mutex,
int __decr);
libc_hidden_proto (__pthread_mutex_unlock_usercnt)
extern int __pthread_mutexattr_init (pthread_mutexattr_t *attr);
libc_hidden_proto (__pthread_mutexattr_init)
extern int __pthread_mutexattr_destroy (pthread_mutexattr_t *attr);
extern int __pthread_mutexattr_settype (pthread_mutexattr_t *attr, int kind);
libc_hidden_proto (__pthread_mutexattr_settype)
extern int __pthread_attr_destroy (pthread_attr_t *attr);
libc_hidden_proto (__pthread_attr_destroy)
extern int __pthread_attr_getdetachstate (const pthread_attr_t *attr,
int *detachstate);
extern int __pthread_attr_setdetachstate (pthread_attr_t *attr,
int detachstate);
extern int __pthread_attr_getinheritsched (const pthread_attr_t *attr,
int *inherit);
extern int __pthread_attr_setinheritsched (pthread_attr_t *attr, int inherit);
extern int __pthread_attr_getschedparam (const pthread_attr_t *attr,
struct sched_param *param);
extern int __pthread_attr_setschedparam (pthread_attr_t *attr,
const struct sched_param *param);
extern int __pthread_attr_getschedpolicy (const pthread_attr_t *attr,
int *policy);
extern int __pthread_attr_setschedpolicy (pthread_attr_t *attr, int policy);
extern int __pthread_attr_getscope (const pthread_attr_t *attr, int *scope);
extern int __pthread_attr_setscope (pthread_attr_t *attr, int scope);
extern int __pthread_attr_getstackaddr (const pthread_attr_t *__restrict
__attr, void **__restrict __stackaddr);
extern int __pthread_attr_setstackaddr (pthread_attr_t *__attr,
void *__stackaddr);
extern int __pthread_attr_getstacksize (const pthread_attr_t *__restrict
__attr,
size_t *__restrict __stacksize);
extern int __pthread_attr_setstacksize (pthread_attr_t *__attr,
size_t __stacksize);
extern int __pthread_attr_getstack (const pthread_attr_t *__restrict __attr,
void **__restrict __stackaddr,
size_t *__restrict __stacksize);
extern int __pthread_attr_setstack (pthread_attr_t *__attr, void *__stackaddr,
size_t __stacksize);
int __pthread_attr_setaffinity_np (pthread_attr_t *, size_t, const cpu_set_t *);
libc_hidden_proto (__pthread_attr_setaffinity_np)
extern __typeof (pthread_getattr_default_np) __pthread_getattr_default_np;
libc_hidden_proto (__pthread_getattr_default_np)
extern int __pthread_rwlock_init (pthread_rwlock_t *__restrict __rwlock,
const pthread_rwlockattr_t *__restrict
__attr);
extern int __pthread_rwlock_destroy (pthread_rwlock_t *__rwlock);
extern int __pthread_rwlock_rdlock (pthread_rwlock_t *__rwlock);
libc_hidden_proto (__pthread_rwlock_rdlock)
extern int __pthread_rwlock_tryrdlock (pthread_rwlock_t *__rwlock);
extern int __pthread_rwlock_wrlock (pthread_rwlock_t *__rwlock);
libc_hidden_proto (__pthread_rwlock_wrlock)
extern int __pthread_rwlock_trywrlock (pthread_rwlock_t *__rwlock);
extern int __pthread_rwlock_unlock (pthread_rwlock_t *__rwlock);
extern int __pthread_cond_broadcast (pthread_cond_t *cond);
libc_hidden_proto (__pthread_cond_broadcast)
extern int __pthread_cond_destroy (pthread_cond_t *cond);
libc_hidden_proto (__pthread_cond_destroy)
extern int __pthread_cond_init (pthread_cond_t *cond,
const pthread_condattr_t *cond_attr);
libc_hidden_proto (__pthread_cond_init)
extern int __pthread_cond_signal (pthread_cond_t *cond);
libc_hidden_proto (__pthread_cond_signal)
extern int __pthread_cond_wait (pthread_cond_t *cond, pthread_mutex_t *mutex);
libc_hidden_proto (__pthread_cond_wait)
#if __TIMESIZE == 64
# define __pthread_clockjoin_np64 __pthread_clockjoin_np
# define __pthread_timedjoin_np64 __pthread_timedjoin_np
# define __pthread_cond_timedwait64 __pthread_cond_timedwait
# define __pthread_cond_clockwait64 __pthread_cond_clockwait
# define __pthread_rwlock_clockrdlock64 __pthread_rwlock_clockrdlock
# define __pthread_rwlock_clockwrlock64 __pthread_rwlock_clockwrlock
# define __pthread_rwlock_timedrdlock64 __pthread_rwlock_timedrdlock
# define __pthread_rwlock_timedwrlock64 __pthread_rwlock_timedwrlock
# define __pthread_mutex_clocklock64 __pthread_mutex_clocklock
# define __pthread_mutex_timedlock64 __pthread_mutex_timedlock
#else
extern int __pthread_clockjoin_np64 (pthread_t threadid, void **thread_return,
clockid_t clockid,
const struct __timespec64 *abstime);
libc_hidden_proto (__pthread_clockjoin_np64)
extern int __pthread_timedjoin_np64 (pthread_t threadid, void **thread_return,
const struct __timespec64 *abstime);
libc_hidden_proto (__pthread_timedjoin_np64)
extern int __pthread_cond_timedwait64 (pthread_cond_t *cond,
pthread_mutex_t *mutex,
const struct __timespec64 *abstime);
libc_hidden_proto (__pthread_cond_timedwait64)
extern int __pthread_cond_clockwait64 (pthread_cond_t *cond,
pthread_mutex_t *mutex,
clockid_t clockid,
const struct __timespec64 *abstime);
libc_hidden_proto (__pthread_cond_clockwait64)
extern int __pthread_rwlock_clockrdlock64 (pthread_rwlock_t *rwlock,
clockid_t clockid,
const struct __timespec64 *abstime);
libc_hidden_proto (__pthread_rwlock_clockrdlock64)
extern int __pthread_rwlock_clockwrlock64 (pthread_rwlock_t *rwlock,
clockid_t clockid,
const struct __timespec64 *abstime);
libc_hidden_proto (__pthread_rwlock_clockwrlock64)
extern int __pthread_rwlock_timedrdlock64 (pthread_rwlock_t *rwlock,
const struct __timespec64 *abstime);
libc_hidden_proto (__pthread_rwlock_timedrdlock64)
extern int __pthread_rwlock_timedwrlock64 (pthread_rwlock_t *rwlock,
const struct __timespec64 *abstime);
libc_hidden_proto (__pthread_rwlock_timedwrlock64)
extern int __pthread_mutex_clocklock64 (pthread_mutex_t *mutex,
clockid_t clockid,
const struct __timespec64 *abstime);
libc_hidden_proto (__pthread_mutex_clocklock64)
extern int __pthread_mutex_timedlock64 (pthread_mutex_t *mutex,
const struct __timespec64 *abstime);
libc_hidden_proto (__pthread_mutex_timedlock64)
#endif
extern int __pthread_cond_timedwait (pthread_cond_t *cond,
pthread_mutex_t *mutex,
const struct timespec *abstime);
libc_hidden_proto (__pthread_cond_timedwait)
extern int __pthread_cond_clockwait (pthread_cond_t *cond,
pthread_mutex_t *mutex,
clockid_t clockid,
const struct timespec *abstime)
__nonnull ((1, 2, 4));
libc_hidden_proto (__pthread_cond_clockwait)
extern int __pthread_mutex_clocklock (pthread_mutex_t *mutex,
clockid_t clockid,
const struct timespec *abstime);
libc_hidden_proto (__pthread_mutex_clocklock)
extern int __pthread_mutex_timedlock (pthread_mutex_t *mutex,
const struct timespec *abstime);
libc_hidden_proto (__pthread_mutex_timedlock)
extern int __pthread_condattr_destroy (pthread_condattr_t *attr);
extern int __pthread_condattr_init (pthread_condattr_t *attr);
extern int __pthread_key_create (pthread_key_t *key, void (*destr) (void *));
libc_hidden_proto (__pthread_key_create)
extern int __pthread_key_delete (pthread_key_t key);
libc_hidden_proto (__pthread_key_delete)
extern void *__pthread_getspecific (pthread_key_t key);
libc_hidden_proto (__pthread_getspecific)
extern int __pthread_setspecific (pthread_key_t key, const void *value);
libc_hidden_proto (__pthread_setspecific)
extern int __pthread_once (pthread_once_t *once_control,
void (*init_routine) (void));
libc_hidden_proto (__pthread_once)
extern int __pthread_atfork (void (*prepare) (void), void (*parent) (void),
void (*child) (void));
libc_hidden_proto (__pthread_self)
extern int __pthread_equal (pthread_t thread1, pthread_t thread2);
extern int __pthread_detach (pthread_t th);
libc_hidden_proto (__pthread_detach)
extern int __pthread_kill (pthread_t threadid, int signo);
libc_hidden_proto (__pthread_kill)
extern int __pthread_cancel (pthread_t th);
extern int __pthread_kill_internal (pthread_t threadid, int signo)
attribute_hidden;
extern int __pthread_raise_internal (int signo) attribute_hidden;
extern void __pthread_exit (void *value) __attribute__ ((__noreturn__));
libc_hidden_proto (__pthread_exit)
extern int __pthread_join (pthread_t threadid, void **thread_return);
libc_hidden_proto (__pthread_join)
extern int __pthread_setcanceltype (int type, int *oldtype);
libc_hidden_proto (__pthread_setcanceltype)
extern void __pthread_testcancel (void);
libc_hidden_proto (__pthread_testcancel)
extern int __pthread_clockjoin_ex (pthread_t, void **, clockid_t,
const struct __timespec64 *, bool)
attribute_hidden;
extern int __pthread_sigmask (int, const sigset_t *, sigset_t *);
libc_hidden_proto (__pthread_sigmask);
#if IS_IN (libpthread)
hidden_proto (__pthread_rwlock_unlock)
#endif
extern int __pthread_cond_broadcast_2_0 (pthread_cond_2_0_t *cond);
extern int __pthread_cond_destroy_2_0 (pthread_cond_2_0_t *cond);
extern int __pthread_cond_init_2_0 (pthread_cond_2_0_t *cond,
const pthread_condattr_t *cond_attr);
extern int __pthread_cond_signal_2_0 (pthread_cond_2_0_t *cond);
extern int __pthread_cond_timedwait_2_0 (pthread_cond_2_0_t *cond,
pthread_mutex_t *mutex,
const struct timespec *abstime);
extern int __pthread_cond_wait_2_0 (pthread_cond_2_0_t *cond,
pthread_mutex_t *mutex);
extern int __pthread_getaffinity_np (pthread_t th, size_t cpusetsize,
cpu_set_t *cpuset);
libc_hidden_proto (__pthread_getaffinity_np)
/* Special internal version of pthread_attr_setsigmask_np which does
not filter out internal signals from *SIGMASK. This can be used to
launch threads with internal signals blocked. */
extern int __pthread_attr_setsigmask_internal (pthread_attr_t *attr,
const sigset_t *sigmask);
libc_hidden_proto (__pthread_attr_setsigmask_internal)
extern __typeof (pthread_attr_getsigmask_np) __pthread_attr_getsigmask_np;
libc_hidden_proto (__pthread_attr_getsigmask_np)
/* Special versions which use non-exported functions. */
extern void __pthread_cleanup_push (struct _pthread_cleanup_buffer *buffer,
void (*routine) (void *), void *arg);
libc_hidden_proto (__pthread_cleanup_push)
/* Replace cleanup macros defined in <pthread.h> with internal
versions that don't depend on unwind info and better support
cancellation. */
# undef pthread_cleanup_push
# define pthread_cleanup_push(routine,arg) \
{ struct _pthread_cleanup_buffer _buffer; \
__pthread_cleanup_push (&_buffer, (routine), (arg));
extern void __pthread_cleanup_pop (struct _pthread_cleanup_buffer *buffer,
int execute);
libc_hidden_proto (__pthread_cleanup_pop)
# undef pthread_cleanup_pop
# define pthread_cleanup_pop(execute) \
__pthread_cleanup_pop (&_buffer, (execute)); }
#if defined __EXCEPTIONS && !defined __cplusplus
/* Structure to hold the cleanup handler information. */
struct __pthread_cleanup_combined_frame
{
void (*__cancel_routine) (void *);
void *__cancel_arg;
int __do_it;
struct _pthread_cleanup_buffer __buffer;
};
/* Special cleanup macros which register cleanup both using
__pthread_cleanup_{push,pop} and using cleanup attribute. This is needed
for pthread_once, so that it supports both throwing exceptions from the
pthread_once callback (only cleanup attribute works there) and cancellation
of the thread running the callback if the callback or some routines it
calls don't have unwind information. */
static __always_inline void
__pthread_cleanup_combined_routine (struct __pthread_cleanup_combined_frame
*__frame)
{
if (__frame->__do_it)
{
__frame->__cancel_routine (__frame->__cancel_arg);
__frame->__do_it = 0;
__pthread_cleanup_pop (&__frame->__buffer, 0);
}
}
static inline void
__pthread_cleanup_combined_routine_voidptr (void *__arg)
{
struct __pthread_cleanup_combined_frame *__frame
= (struct __pthread_cleanup_combined_frame *) __arg;
if (__frame->__do_it)
{
__frame->__cancel_routine (__frame->__cancel_arg);
__frame->__do_it = 0;
}
}
# define pthread_cleanup_combined_push(routine, arg) \
do { \
void (*__cancel_routine) (void *) = (routine); \
struct __pthread_cleanup_combined_frame __clframe \
__attribute__ ((__cleanup__ (__pthread_cleanup_combined_routine))) \
= { .__cancel_routine = __cancel_routine, .__cancel_arg = (arg), \
.__do_it = 1 }; \
__pthread_cleanup_push (&__clframe.__buffer, \
__pthread_cleanup_combined_routine_voidptr, \
&__clframe);
# define pthread_cleanup_combined_pop(execute) \
__pthread_cleanup_pop (&__clframe.__buffer, 0); \
__clframe.__do_it = 0; \
if (execute) \
__cancel_routine (__clframe.__cancel_arg); \
} while (0)
#endif /* __EXCEPTIONS && !defined __cplusplus */
extern void __pthread_cleanup_push_defer (struct _pthread_cleanup_buffer *buffer,
void (*routine) (void *), void *arg);
extern void __pthread_cleanup_pop_restore (struct _pthread_cleanup_buffer *buffer,
int execute);
/* Old cleanup interfaces, still used in libc.so. */
extern void _pthread_cleanup_push (struct _pthread_cleanup_buffer *buffer,
void (*routine) (void *), void *arg);
extern void _pthread_cleanup_pop (struct _pthread_cleanup_buffer *buffer,
int execute);
extern void _pthread_cleanup_push_defer (struct _pthread_cleanup_buffer *buffer,
void (*routine) (void *), void *arg);
extern void _pthread_cleanup_pop_restore (struct _pthread_cleanup_buffer *buffer,
int execute);
extern void __nptl_deallocate_tsd (void);
libc_hidden_proto (__nptl_deallocate_tsd)
void __nptl_setxid_sighandler (int sig, siginfo_t *si, void *ctx);
libc_hidden_proto (__nptl_setxid_sighandler)
extern int __nptl_setxid (struct xid_command *cmdp) attribute_hidden;
extern void __wait_lookup_done (void) attribute_hidden;
/* Allocates the extension space for ATTR. Returns an error code on
memory allocation failure, zero on success. If ATTR already has an
extension space, this function does nothing. */
int __pthread_attr_extension (struct pthread_attr *attr) attribute_hidden
__attribute_warn_unused_result__;
#ifdef SHARED
# define PTHREAD_STATIC_FN_REQUIRE(name)
#else
# define PTHREAD_STATIC_FN_REQUIRE(name) __asm (".globl " #name);
#endif
/* Make a deep copy of the attribute *SOURCE in *TARGET. *TARGET is
not assumed to have been initialized. Returns 0 on success, or a
positive error code otherwise. */
int __pthread_attr_copy (pthread_attr_t *target, const pthread_attr_t *source);
libc_hidden_proto (__pthread_attr_copy)
/* Returns 0 if POL is a valid scheduling policy. */
static inline int
check_sched_policy_attr (int pol)
{
if (pol == SCHED_OTHER || pol == SCHED_FIFO || pol == SCHED_RR)
return 0;
return EINVAL;
}
/* Returns 0 if PR is within the accepted range of priority values for
the scheduling policy POL or EINVAL otherwise. */
static inline int
check_sched_priority_attr (int pr, int pol)
{
int min = __sched_get_priority_min (pol);
int max = __sched_get_priority_max (pol);
if (min >= 0 && max >= 0 && pr >= min && pr <= max)
return 0;
return EINVAL;
}
/* Returns 0 if ST is a valid stack size for a thread stack and EINVAL
otherwise. */
static inline int
check_stacksize_attr (size_t st)
{
if (st >= PTHREAD_STACK_MIN)
return 0;
return EINVAL;
}
#define ASSERT_TYPE_SIZE(type, size) \
_Static_assert (sizeof (type) == size, \
"sizeof (" #type ") != " #size)
#define ASSERT_PTHREAD_INTERNAL_SIZE(type, internal) \
_Static_assert (sizeof ((type) { { 0 } }).__size >= sizeof (internal),\
"sizeof (" #type ".__size) < sizeof (" #internal ")")
#define ASSERT_PTHREAD_STRING(x) __STRING (x)
#define ASSERT_PTHREAD_INTERNAL_OFFSET(type, member, offset) \
_Static_assert (offsetof (type, member) == offset, \
"offset of " #member " field of " #type " != " \
ASSERT_PTHREAD_STRING (offset))
#define ASSERT_PTHREAD_INTERNAL_MEMBER_SIZE(type, member, mtype) \
_Static_assert (sizeof (((type) { 0 }).member) != 8, \
"sizeof (" #type "." #member ") != sizeof (" #mtype "))")
#endif /* pthreadP.h */
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