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glibc/sysdeps/nptl/pthreadP.h
Wangyang Guo 8162147872 nptl: Add backoff mechanism to spinlock loop 
When mutiple threads waiting for lock at the same time, once lock owner
releases the lock, waiters will see lock available and all try to lock,
which may cause an expensive CAS storm.

Binary exponential backoff with random jitter is introduced. As try-lock
attempt increases, there is more likely that a larger number threads
compete for adaptive mutex lock, so increase wait time in exponential.
A random jitter is also added to avoid synchronous try-lock from other
threads.

v2: Remove read-check before try-lock for performance.

v3:
1. Restore read-check since it works well in some platform.
2. Make backoff arch dependent, and enable it for x86_64.
3. Limit max backoff to reduce latency in large critical section.

v4: Fix strict-prototypes error in sysdeps/nptl/pthread_mutex_backoff.h

v5: Commit log updated for regression in large critical section.

Result of pthread-mutex-locks bench

Test Platform: Xeon 8280L (2 socket, 112 CPUs in total)
First Row: thread number
First Col: critical section length
Values: backoff vs upstream, time based, low is better

non-critical-length: 1
	1	2	4	8	16	32	64	112	140
0	0.99	0.58	0.52	0.49	0.43	0.44	0.46	0.52	0.54
1	0.98	0.43	0.56	0.50	0.44	0.45	0.50	0.56	0.57
2	0.99	0.41	0.57	0.51	0.45	0.47	0.48	0.60	0.61
4	0.99	0.45	0.59	0.53	0.48	0.49	0.52	0.64	0.65
8	1.00	0.66	0.71	0.63	0.56	0.59	0.66	0.72	0.71
16	0.97	0.78	0.91	0.73	0.67	0.70	0.79	0.80	0.80
32	0.95	1.17	0.98	0.87	0.82	0.86	0.89	0.90	0.90
64	0.96	0.95	1.01	1.01	0.98	1.00	1.03	0.99	0.99
128	0.99	1.01	1.01	1.17	1.08	1.12	1.02	0.97	1.02

non-critical-length: 32
	1	2	4	8	16	32	64	112	140
0	1.03	0.97	0.75	0.65	0.58	0.58	0.56	0.70	0.70
1	0.94	0.95	0.76	0.65	0.58	0.58	0.61	0.71	0.72
2	0.97	0.96	0.77	0.66	0.58	0.59	0.62	0.74	0.74
4	0.99	0.96	0.78	0.66	0.60	0.61	0.66	0.76	0.77
8	0.99	0.99	0.84	0.70	0.64	0.66	0.71	0.80	0.80
16	0.98	0.97	0.95	0.76	0.70	0.73	0.81	0.85	0.84
32	1.04	1.12	1.04	0.89	0.82	0.86	0.93	0.91	0.91
64	0.99	1.15	1.07	1.00	0.99	1.01	1.05	0.99	0.99
128	1.00	1.21	1.20	1.22	1.25	1.31	1.12	1.10	0.99

non-critical-length: 128
	1	2	4	8	16	32	64	112	140
0	1.02	1.00	0.99	0.67	0.61	0.61	0.61	0.74	0.73
1	0.95	0.99	1.00	0.68	0.61	0.60	0.60	0.74	0.74
2	1.00	1.04	1.00	0.68	0.59	0.61	0.65	0.76	0.76
4	1.00	0.96	0.98	0.70	0.63	0.63	0.67	0.78	0.77
8	1.01	1.02	0.89	0.73	0.65	0.67	0.71	0.81	0.80
16	0.99	0.96	0.96	0.79	0.71	0.73	0.80	0.84	0.84
32	0.99	0.95	1.05	0.89	0.84	0.85	0.94	0.92	0.91
64	1.00	0.99	1.16	1.04	1.00	1.02	1.06	0.99	0.99
128	1.00	1.06	0.98	1.14	1.39	1.26	1.08	1.02	0.98

There is regression in large critical section. But adaptive mutex is
aimed for "quick" locks. Small critical section is more common when
users choose to use adaptive pthread_mutex.

Signed-off-by: Wangyang Guo <wangyang.guo@intel.com>
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
2022-05-09 14:38:40 -07:00

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/* Copyright (C) 2002-2022 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
#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 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)
{
struct pthread *self = THREAD_SELF;
/* Make sure we get no more cancellations. */
atomic_bit_set (&self->cancelhandling, EXITING_BIT);
__pthread_unwind ((__pthread_unwind_buf_t *)
THREAD_GETMEM (self, cleanup_jmp_buf));
}
/* 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 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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