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glibc/nptl/pthreadP.h
Kemi Wang 6310e6be9b Mutex: Add pthread mutex tunables 
This patch does not have any functionality change, we only provide a spin
count tunes for pthread adaptive spin mutex. The tunable
glibc.pthread.mutex_spin_count tunes can be used by system administrator to
squeeze system performance according to different hardware capabilities and
workload characteristics.

The maximum value of spin count is limited to 32767 to avoid the overflow
of mutex->__data.__spins variable with the possible type of short in
pthread_mutex_lock ().

The default value of spin count is set to 100 with the reference to the
previous number of times of spinning via trylock. This value would be
architecture-specific and can be tuned with kinds of benchmarks to fit most
cases in future.

I would extend my appreciation sincerely to H.J.Lu for his help to refine
this patch series.

	* manual/tunables.texi (POSIX Thread Tunables): New node.
	* nptl/Makefile (libpthread-routines): Add pthread_mutex_conf.
	* nptl/nptl-init.c: Include pthread_mutex_conf.h
	(__pthread_initialize_minimal_internal) [HAVE_TUNABLES]: Call
	 __pthread_tunables_init.
	* nptl/pthreadP.h (MAX_ADAPTIVE_COUNT): Remove.
	(max_adaptive_count): Define.
	* nptl/pthread_mutex_conf.c: New file.
	* nptl/pthread_mutex_conf.h: New file.
	* sysdeps/generic/adaptive_spin_count.h: New file.
	* sysdeps/nptl/dl-tunables.list: New file.
	* nptl/pthread_mutex_lock.c (__pthread_mutex_lock): Use
	max_adaptive_count () not MAX_ADAPTIVE_COUNT.
	* nptl/pthread_mutex_timedlock.c (__pthrad_mutex_timedlock):
	Likewise.

Suggested-by: Andi Kleen <andi.kleen@intel.com>
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Signed-off-by: Kemi.wang <kemi.wang@intel.com>
2018-12-01 08:19:20 -08:00

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/* Copyright (C) 2002-2018 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
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
<http://www.gnu.org/licenses/>. */
#ifndef _PTHREADP_H
#define _PTHREADP_H 1
#include <pthread.h>
#include <setjmp.h>
#include <stdbool.h>
#include <sys/syscall.h>
#include "descr.h"
#include <tls.h>
#include <lowlevellock.h>
#include <stackinfo.h>
#include <internaltypes.h>
#include <pthread-functions.h>
#include <atomic.h>
#include <kernel-features.h>
#include <errno.h>
#include <internal-signals.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
#ifndef THREAD_ATOMIC_BIT_SET
# define THREAD_ATOMIC_BIT_SET(descr, member, bit) \
atomic_bit_set (&(descr)->member, bit)
#endif
static inline short max_adaptive_count (void)
{
#if HAVE_TUNABLES
return __mutex_aconf.spin_count;
#else
return DEFAULT_ADAPTIVE_COUNT;
#endif
}
/* 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 struct pthread_attr __default_pthread_attr attribute_hidden;
extern int __default_pthread_attr_lock attribute_hidden;
/* Size and alignment of static TLS block. */
extern size_t __static_tls_size attribute_hidden;
extern size_t __static_tls_align_m1 attribute_hidden;
/* Flag whether the machine is SMP or not. */
extern int __is_smp attribute_hidden;
/* Thread descriptor handling. */
extern list_t __stack_user;
hidden_proto (__stack_user)
/* 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];
hidden_proto (__pthread_keys)
/* Number of threads running. */
extern unsigned int __nptl_nthreads attribute_hidden;
#ifndef __ASSUME_SET_ROBUST_LIST
/* Negative if we do not have the system call and we can use it. */
extern int __set_robust_list_avail attribute_hidden;
#endif
/* Thread Priority Protection. */
extern int __sched_fifo_min_prio attribute_hidden;
extern int __sched_fifo_max_prio attribute_hidden;
extern void __init_sched_fifo_prio (void) attribute_hidden;
extern int __pthread_tpp_change_priority (int prev_prio, int new_prio)
attribute_hidden;
extern int __pthread_current_priority (void) attribute_hidden;
/* The library can run in debugging mode where it performs a lot more
tests. */
extern int __pthread_debug attribute_hidden;
/** For now disable debugging support. */
#if 0
# define DEBUGGING_P __builtin_expect (__pthread_debug, 0)
# define INVALID_TD_P(pd) (DEBUGGING_P && __find_in_stack_list (pd) == NULL)
# define INVALID_NOT_TERMINATED_TD_P(pd) INVALID_TD_P (pd)
#else
# define DEBUGGING_P 0
/* Simplified test. 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)
#endif
/* Cancellation test. */
#define CANCELLATION_P(self) \
do { \
int cancelhandling = THREAD_GETMEM (self, cancelhandling); \
if (CANCEL_ENABLED_AND_CANCELED (cancelhandling)) \
{ \
THREAD_SETMEM (self, result, PTHREAD_CANCELED); \
__do_cancel (); \
} \
} while (0)
extern void __pthread_unwind (__pthread_unwind_buf_t *__buf)
__cleanup_fct_attribute __attribute ((__noreturn__))
#if !defined SHARED && !IS_IN (libpthread)
weak_function
#endif
;
extern void __pthread_unwind_next (__pthread_unwind_buf_t *__buf)
__cleanup_fct_attribute __attribute ((__noreturn__))
#ifndef SHARED
weak_function
#endif
;
extern void __pthread_register_cancel (__pthread_unwind_buf_t *__buf)
__cleanup_fct_attribute;
extern void __pthread_unregister_cancel (__pthread_unwind_buf_t *__buf)
__cleanup_fct_attribute;
#if IS_IN (libpthread)
hidden_proto (__pthread_unwind)
hidden_proto (__pthread_unwind_next)
hidden_proto (__pthread_register_cancel)
hidden_proto (__pthread_unregister_cancel)
# ifdef SHARED
extern void attribute_hidden pthread_cancel_init (void);
# endif
extern void __nptl_unwind_freeres (void) attribute_hidden;
#endif
/* Called when a thread reacts on a cancellation request. */
static inline void
__attribute ((noreturn, always_inline))
__do_cancel (void)
{
struct pthread *self = THREAD_SELF;
/* Make sure we get no more cancellations. */
THREAD_ATOMIC_BIT_SET (self, cancelhandling, EXITING_BIT);
__pthread_unwind ((__pthread_unwind_buf_t *)
THREAD_GETMEM (self, cleanup_jmp_buf));
}
/* Set cancellation mode to asynchronous. */
#define CANCEL_ASYNC() \
__pthread_enable_asynccancel ()
/* Reset to previous cancellation mode. */
#define CANCEL_RESET(oldtype) \
__pthread_disable_asynccancel (oldtype)
#if IS_IN (libc)
/* Same as CANCEL_ASYNC, but for use in libc.so. */
# define LIBC_CANCEL_ASYNC() \
__libc_enable_asynccancel ()
/* Same as CANCEL_RESET, but for use in libc.so. */
# define LIBC_CANCEL_RESET(oldtype) \
__libc_disable_asynccancel (oldtype)
# define LIBC_CANCEL_HANDLED() \
__asm (".globl " __SYMBOL_PREFIX "__libc_enable_asynccancel"); \
__asm (".globl " __SYMBOL_PREFIX "__libc_disable_asynccancel")
#elif IS_IN (libpthread)
# define LIBC_CANCEL_ASYNC() CANCEL_ASYNC ()
# define LIBC_CANCEL_RESET(val) CANCEL_RESET (val)
# define LIBC_CANCEL_HANDLED() \
__asm (".globl " __SYMBOL_PREFIX "__pthread_enable_asynccancel"); \
__asm (".globl " __SYMBOL_PREFIX "__pthread_disable_asynccancel")
#elif IS_IN (librt)
# define LIBC_CANCEL_ASYNC() \
__librt_enable_asynccancel ()
# define LIBC_CANCEL_RESET(val) \
__librt_disable_asynccancel (val)
# define LIBC_CANCEL_HANDLED() \
__asm (".globl " __SYMBOL_PREFIX "__librt_enable_asynccancel"); \
__asm (".globl " __SYMBOL_PREFIX "__librt_disable_asynccancel")
#else
# define LIBC_CANCEL_ASYNC() 0 /* Just a dummy value. */
# define LIBC_CANCEL_RESET(val) ((void)(val)) /* Nothing, but evaluate it. */
# define LIBC_CANCEL_HANDLED() /* Nothing. */
#endif
/* Internal prototypes. */
/* Thread list handling. */
extern struct pthread *__find_in_stack_list (struct pthread *pd)
attribute_hidden;
/* Deallocate a thread's stack after optionally making sure the thread
descriptor is still valid. */
extern void __free_tcb (struct pthread *pd) attribute_hidden;
/* Free allocated stack. */
extern void __deallocate_stack (struct pthread *pd) attribute_hidden;
/* Mark all the stacks except for the current one as available. This
function also re-initializes the lock for the stack cache. */
extern void __reclaim_stacks (void) attribute_hidden;
/* Make all threads's stacks executable. */
extern int __make_stacks_executable (void **stack_endp) attribute_hidden;
/* longjmp handling. */
extern void __pthread_cleanup_upto (__jmp_buf target, char *targetframe);
#if IS_IN (libpthread)
hidden_proto (__pthread_cleanup_upto)
#endif
/* Functions with versioned interfaces. */
extern int __pthread_create_2_1 (pthread_t *newthread,
const pthread_attr_t *attr,
void *(*start_routine) (void *), void *arg);
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_2_1 (pthread_attr_t *attr);
extern int __pthread_attr_init_2_0 (pthread_attr_t *attr);
/* Event handlers for libthread_db interface. */
extern void __nptl_create_event (void);
extern void __nptl_death_event (void);
hidden_proto (__nptl_create_event)
hidden_proto (__nptl_death_event)
/* Register the generation counter in the libpthread with the libc. */
#ifdef TLS_MULTIPLE_THREADS_IN_TCB
extern void __libc_pthread_init (unsigned long int *ptr,
void (*reclaim) (void),
const struct pthread_functions *functions);
#else
extern int *__libc_pthread_init (unsigned long int *ptr,
void (*reclaim) (void),
const struct pthread_functions *functions);
/* Variable set to a nonzero value either if more than one thread runs or ran,
or if a single-threaded process is trying to cancel itself. See
nptl/descr.h for more context on the single-threaded process case. */
extern int __pthread_multiple_threads attribute_hidden;
/* Pointer to the corresponding variable in libc. */
extern int *__libc_multiple_threads_ptr attribute_hidden;
#endif
/* Find a thread given its TID. */
extern struct pthread *__find_thread_by_id (pid_t tid) attribute_hidden
#ifdef SHARED
;
#else
weak_function;
#define __find_thread_by_id(tid) \
(__find_thread_by_id ? (__find_thread_by_id) (tid) : (struct pthread *) NULL)
#endif
extern void __pthread_init_static_tls (struct link_map *) attribute_hidden;
extern size_t __pthread_get_minstack (const pthread_attr_t *attr);
/* Namespace save aliases. */
extern int __pthread_getschedparam (pthread_t thread_id, int *policy,
struct sched_param *param);
extern int __pthread_setschedparam (pthread_t thread_id, int policy,
const struct sched_param *param);
extern int __pthread_setcancelstate (int state, int *oldstate);
extern int __pthread_mutex_init (pthread_mutex_t *__mutex,
const pthread_mutexattr_t *__mutexattr);
extern int __pthread_mutex_destroy (pthread_mutex_t *__mutex);
extern int __pthread_mutex_trylock (pthread_mutex_t *_mutex);
extern int __pthread_mutex_lock (pthread_mutex_t *__mutex);
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);
extern int __pthread_mutex_unlock_usercnt (pthread_mutex_t *__mutex,
int __decr) attribute_hidden;
extern int __pthread_mutexattr_init (pthread_mutexattr_t *attr);
extern int __pthread_mutexattr_destroy (pthread_mutexattr_t *attr);
extern int __pthread_mutexattr_settype (pthread_mutexattr_t *attr, int kind);
extern int __pthread_attr_destroy (pthread_attr_t *attr);
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);
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);
extern int __pthread_rwlock_tryrdlock (pthread_rwlock_t *__rwlock);
extern int __pthread_rwlock_wrlock (pthread_rwlock_t *__rwlock);
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);
extern int __pthread_cond_destroy (pthread_cond_t *cond);
extern int __pthread_cond_init (pthread_cond_t *cond,
const pthread_condattr_t *cond_attr);
extern int __pthread_cond_signal (pthread_cond_t *cond);
extern int __pthread_cond_wait (pthread_cond_t *cond, pthread_mutex_t *mutex);
extern int __pthread_cond_timedwait (pthread_cond_t *cond,
pthread_mutex_t *mutex,
const struct timespec *abstime);
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 *));
extern int __pthread_key_delete (pthread_key_t key);
extern void *__pthread_getspecific (pthread_key_t key);
extern int __pthread_setspecific (pthread_key_t key, const void *value);
extern int __pthread_once (pthread_once_t *once_control,
void (*init_routine) (void));
extern int __pthread_atfork (void (*prepare) (void), void (*parent) (void),
void (*child) (void));
extern pthread_t __pthread_self (void);
extern int __pthread_equal (pthread_t thread1, pthread_t thread2);
extern int __pthread_detach (pthread_t th);
extern int __pthread_cancel (pthread_t th);
extern int __pthread_kill (pthread_t threadid, int signo);
extern void __pthread_exit (void *value) __attribute__ ((__noreturn__));
extern int __pthread_join (pthread_t threadid, void **thread_return);
extern int __pthread_setcanceltype (int type, int *oldtype);
extern int __pthread_enable_asynccancel (void) attribute_hidden;
extern void __pthread_disable_asynccancel (int oldtype) attribute_hidden;
extern void __pthread_testcancel (void);
extern int __pthread_timedjoin_ex (pthread_t, void **, const struct timespec *,
bool);
#if IS_IN (libpthread)
hidden_proto (__pthread_mutex_init)
hidden_proto (__pthread_mutex_destroy)
hidden_proto (__pthread_mutex_lock)
hidden_proto (__pthread_mutex_trylock)
hidden_proto (__pthread_mutex_unlock)
hidden_proto (__pthread_rwlock_rdlock)
hidden_proto (__pthread_rwlock_wrlock)
hidden_proto (__pthread_rwlock_unlock)
hidden_proto (__pthread_key_create)
hidden_proto (__pthread_getspecific)
hidden_proto (__pthread_setspecific)
hidden_proto (__pthread_once)
hidden_proto (__pthread_setcancelstate)
hidden_proto (__pthread_testcancel)
hidden_proto (__pthread_mutexattr_init)
hidden_proto (__pthread_mutexattr_settype)
hidden_proto (__pthread_timedjoin_ex)
#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);
/* The two functions are in libc.so and not exported. */
extern int __libc_enable_asynccancel (void) attribute_hidden;
extern void __libc_disable_asynccancel (int oldtype) attribute_hidden;
/* The two functions are in librt.so and not exported. */
extern int __librt_enable_asynccancel (void) attribute_hidden;
extern void __librt_disable_asynccancel (int oldtype) attribute_hidden;
#if IS_IN (libpthread)
/* Special versions which use non-exported functions. */
extern void __pthread_cleanup_push (struct _pthread_cleanup_buffer *buffer,
void (*routine) (void *), void *arg)
attribute_hidden;
/* 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) attribute_hidden;
# undef pthread_cleanup_pop
# define pthread_cleanup_pop(execute) \
__pthread_cleanup_pop (&_buffer, (execute)); }
#endif
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) attribute_hidden;
extern void __nptl_setxid_error (struct xid_command *cmdp, int error)
attribute_hidden;
extern int __nptl_setxid (struct xid_command *cmdp) attribute_hidden;
#ifndef SHARED
extern void __nptl_set_robust (struct pthread *self);
#endif
extern void __nptl_stacks_freeres (void) attribute_hidden;
extern void __shm_directory_freeres (void) attribute_hidden;
extern void __wait_lookup_done (void) attribute_hidden;
#ifdef SHARED
# define PTHREAD_STATIC_FN_REQUIRE(name)
#else
# define PTHREAD_STATIC_FN_REQUIRE(name) __asm (".globl " #name);
#endif
/* 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))
#endif /* pthreadP.h */
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