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/* Copyright (C) 2002-2025 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 _INTERNALTYPES_H
#define _INTERNALTYPES_H 1
#include <stdint.h>
#include <atomic.h>
#include <endian.h>
struct pthread_attr
{
/* Scheduler parameters and priority. */
struct sched_param schedparam;
int schedpolicy;
/* Various flags like detachstate, scope, etc. */
int flags;
/* Size of guard area. */
size_t guardsize;
/* Stack handling. */
void *stackaddr;
size_t stacksize;
/* Allocated via a call to __pthread_attr_extension once needed. */
struct pthread_attr_extension *extension;
void *unused;
};
#define ATTR_FLAG_DETACHSTATE 0x0001
#define ATTR_FLAG_NOTINHERITSCHED 0x0002
#define ATTR_FLAG_SCOPEPROCESS 0x0004
#define ATTR_FLAG_STACKADDR 0x0008
#define ATTR_FLAG_OLDATTR 0x0010
#define ATTR_FLAG_SCHED_SET 0x0020
#define ATTR_FLAG_POLICY_SET 0x0040
#define ATTR_FLAG_DO_RSEQ 0x0080
/* Used to allocate a pthread_attr_t object which is also accessed
internally. */
union pthread_attr_transparent
{
pthread_attr_t external;
struct pthread_attr internal;
};
/* Extension space for pthread attributes. Referenced by the
extension member of struct pthread_attr. */
struct pthread_attr_extension
{
/* Affinity map. */
cpu_set_t *cpuset;
size_t cpusetsize;
sigset_t sigmask;
bool sigmask_set;
};
/* Mutex attribute data structure. */
struct pthread_mutexattr
{
/* Identifier for the kind of mutex.
Bit 31 is set if the mutex is to be shared between processes.
Bit 0 to 30 contain one of the PTHREAD_MUTEX_ values to identify
the type of the mutex. */
int mutexkind;
};
/* Conditional variable attribute data structure. */
struct pthread_condattr
{
/* Combination of values:
Bit 0 : flag whether conditional variable will be
sharable between processes.
Bit 1-COND_CLOCK_BITS: Clock ID. COND_CLOCK_BITS is the number of bits
needed to represent the ID of the clock. */
int value;
};
#define COND_CLOCK_BITS 1
/* Read-write lock variable attribute data structure. */
struct pthread_rwlockattr
{
int lockkind;
int pshared;
};
/* Barrier data structure. See pthread_barrier_wait for a description
of how these fields are used. */
struct pthread_barrier
{
unsigned int in;
unsigned int current_round;
unsigned int count;
int shared;
unsigned int out;
};
/* See pthread_barrier_wait for a description. */
#define BARRIER_IN_THRESHOLD (UINT_MAX/2)
/* Barrier variable attribute data structure. */
struct pthread_barrierattr
{
int pshared;
};
/* Thread-local data handling. */
struct pthread_key_struct
{
/* Sequence numbers. Even numbers indicated vacant entries. Note
that zero is even. We use uintptr_t to not require padding on
32- and 64-bit machines. On 64-bit machines it helps to avoid
wrapping, too. */
uintptr_t seq;
/* Destructor for the data. */
void (*destr) (void *);
};
/* Check whether an entry is unused. */
#define KEY_UNUSED(p) (((p) & 1) == 0)
/* Check whether a key is usable. We cannot reuse an allocated key if
the sequence counter would overflow after the next destroy call.
This would mean that we potentially free memory for a key with the
same sequence. This is *very* unlikely to happen, A program would
have to create and destroy a key 2^31 times (on 32-bit platforms,
on 64-bit platforms that would be 2^63). If it should happen we
simply don't use this specific key anymore. */
#define KEY_USABLE(p) (((uintptr_t) (p)) < ((uintptr_t) ((p) + 2)))
/* Handling of read-write lock data. */
// XXX For now there is only one flag. Maybe more in future.
#define RWLOCK_RECURSIVE(rwlock) ((rwlock)->__data.__flags != 0)
/* Semaphore variable structure. */
struct new_sem
{
#if __HAVE_64B_ATOMICS
/* The data field holds both value (in the least-significant 32 bits) and
nwaiters. */
# if __BYTE_ORDER == __LITTLE_ENDIAN
# define SEM_VALUE_OFFSET 0
# elif __BYTE_ORDER == __BIG_ENDIAN
# define SEM_VALUE_OFFSET 1
# else
# error Unsupported byte order.
# endif
# define SEM_NWAITERS_SHIFT 32
# define SEM_VALUE_MASK (~(unsigned int)0)
uint64_t data;
int private;
int pad;
#else
# define SEM_VALUE_SHIFT 1
# define SEM_NWAITERS_MASK ((unsigned int)1)
unsigned int value;
int private;
int pad;
unsigned int nwaiters;
#endif
};
struct old_sem
{
unsigned int value;
};
/* Compatibility type for old conditional variable interfaces. */
typedef struct
{
pthread_cond_t *cond;
} pthread_cond_2_0_t;
#endif /* internaltypes.h */
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