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/* MPFR internal header related to thread-local variables.
Copyright 2005-2021 Free Software Foundation, Inc.
Contributed by the AriC and Caramba projects, INRIA.
This file is part of the GNU MPFR Library.
The GNU MPFR 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 3 of the License, or (at your
option) any later version.
The GNU MPFR 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 MPFR Library; see the file COPYING.LESSER. If not, see
https://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,
51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */
#ifndef __MPFR_THREAD_H__
#define __MPFR_THREAD_H__
/* Note: MPFR_NEED_THREAD_LOCK shall be defined before including this
header */
/* Note: Let's define MPFR_THREAD_ATTR even after a #error to make the
error message more visible (e.g. gcc doesn't immediately stop after
the #error line and outputs many error messages if MPFR_THREAD_ATTR
is not defined). But some compilers will just output a message and
may build MPFR "successfully" (without thread support). */
#ifndef MPFR_THREAD_ATTR
# ifdef MPFR_USE_THREAD_SAFE
# if defined(_MSC_VER)
# define MPFR_THREAD_ATTR __declspec( thread )
# elif defined(MPFR_USE_C11_THREAD_SAFE)
# define MPFR_THREAD_ATTR _Thread_local
# else
# define MPFR_THREAD_ATTR __thread
# endif
# else
# define MPFR_THREAD_ATTR
# endif
#endif
/* If MPFR needs a lock mechanism for thread synchro */
#ifdef MPFR_NEED_THREAD_LOCK
/**************************************************************************/
/**************************************************************************/
/* ISO C11 version */
/**************************************************************************/
/**************************************************************************/
#if defined (MPFR_HAVE_C11_LOCK)
/* NOTE: This version has not been completely tested */
#define MPFR_THREAD_LOCK_METHOD "C11"
#include <threads.h>
#define MPFR_LOCK_DECL(_lock) \
mtx_t _lock;
#define MPFR_LOCK_C(E) \
do { \
if ((E) != thrd_success) \
abort (); \
} while (0)
#define MPFR_LOCK_INIT(_lock) MPFR_LOCK_C(mtx_init(&(_lock), mtx_plain))
#define MPFR_LOCK_CLEAR(_lock) do { mtx_destroy(&(_lock)); } while (0)
#define MPFR_LOCK_READ(_lock) MPFR_LOCK_C(mtx_lock(&(_lock)))
#define MPFR_UNLOCK_READ(_lock) MPFR_LOCK_C(mtx_unlock(&(_lock)))
#define MPFR_LOCK_WRITE(_lock) MPFR_LOCK_C(mtx_lock(&(_lock)))
#define MPFR_UNLOCK_WRITE(_lock) MPFR_LOCK_C(mtx_unlock(&(_lock)))
#define MPFR_LOCK_READ2WRITE(_lock) do {} while (0)
#define MPFR_LOCK_WRITE2READ(_lock) do {} while (0)
#define MPFR_ONCE_DECL(_once) \
once_flag _once;
#define MPFR_ONCE_INIT_VALUE ONCE_FLAG_INIT
#define MPFR_ONCE_CALL(_once, _func) do { \
call_once(&(_once), (_func)); \
} while (0)
#define MPFR_NEED_DEFERRED_INIT 1
/**************************************************************************/
/**************************************************************************/
/* POSIX version */
/**************************************************************************/
/**************************************************************************/
#elif defined (HAVE_PTHREAD)
#define MPFR_THREAD_LOCK_METHOD "pthread"
#include <pthread.h>
#define MPFR_LOCK_DECL(_lock) \
pthread_rwlock_t _lock;
#define MPFR_LOCK_C(E) \
do { \
if ((E) != 0) \
abort (); \
} while (0)
#define MPFR_LOCK_INIT(_lock) MPFR_LOCK_C(pthread_rwlock_init(&(_lock), NULL))
#define MPFR_LOCK_CLEAR(_lock) do { \
pthread_rwlock_destroy(&(_lock)); \
} while (0)
#define MPFR_LOCK_READ(_lock) MPFR_LOCK_C(pthread_rwlock_rdlock(&(_lock)))
#define MPFR_UNLOCK_READ(_lock) MPFR_LOCK_C(pthread_rwlock_unlock(&(_lock)))
#define MPFR_LOCK_WRITE(_lock) MPFR_LOCK_C(pthread_rwlock_wrlock(&(_lock)))
#define MPFR_UNLOCK_WRITE(_lock) MPFR_LOCK_C(pthread_rwlock_unlock(&(_lock)))
#define MPFR_LOCK_READ2WRITE(_lock) do { \
MPFR_UNLOCK_READ(_lock); \
MPFR_LOCK_WRITE(_lock); \
} while (0)
#define MPFR_LOCK_WRITE2READ(_lock) do { \
MPFR_UNLOCK_WRITE(_lock); \
MPFR_LOCK_READ(_lock); \
} while (0)
#define MPFR_ONCE_DECL(_once) \
pthread_once_t _once ;
#define MPFR_ONCE_INIT_VALUE PTHREAD_ONCE_INIT
#define MPFR_ONCE_CALL(_once, _func) \
MPFR_LOCK_C(pthread_once (&(_once), (_func)))
#define MPFR_NEED_DEFERRED_INIT 1
#else
/* TODO: Win32 */
# error "No thread lock / unsupported OS."
#endif
#else
/**************************************************************************/
/**************************************************************************/
/* No lock thread version */
/**************************************************************************/
/**************************************************************************/
#define MPFR_LOCK_DECL(_lock)
#define MPFR_LOCK_INIT(_lock) do {} while (0)
#define MPFR_LOCK_CLEAR(_lock) do {} while (0)
#define MPFR_LOCK_READ(_lock) do {} while (0)
#define MPFR_UNLOCK_READ(_lock) do {} while (0)
#define MPFR_LOCK_WRITE(_lock) do {} while (0)
#define MPFR_UNLOCK_WRITE(_lock) do {} while (0)
#define MPFR_LOCK_READ2WRITE(_lock) do {} while (0)
#define MPFR_LOCK_WRITE2READ(_lock) do {} while (0)
#define MPFR_ONCE_INIT_VALUE
#define MPFR_ONCE_DECL(_once)
#define MPFR_ONCE_CALL(_once,_func) do {} while (0)
#endif
/**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/* If MPFR Needs a way to init data before using them */
#if defined(MPFR_NEED_DEFERRED_INIT)
#if defined(MPFR_HAVE_CONSTRUCTOR_ATTR)
/*********************** Use constructor extension ************************/
#define MPFR_DEFERRED_INIT_MASTER_DECL(_id, _init, _clear) \
__attribute__ ((constructor)) static void \
mpfr_init_cache_ ## _id (void) { \
_init ; \
} \
__attribute__ ((destructor)) static void \
mpfr_clean_cache_ ## _id (void) { \
_clear; \
}
#define MPFR_DEFERRED_INIT_CALL(_master) do {} while (0)
#define MPFR_DEFERRED_INIT_SLAVE_DECL()
#define MPFR_DEFERRED_INIT_SLAVE_VALUE(_id)
#else
/**************************** Use once semantic ***************************/
#define MPFR_DEFERRED_INIT_MASTER_DECL(_id, _init, _clear) \
static void mpfr_once_ ## _id ## _clear_func (void) { \
_clear ; \
} \
static void mpfr_once_ ## _id ## _init_func (void) { \
_init; \
atexit(mpfr_once_ ## _id ## _clear_func); \
}
#define MPFR_DEFERRED_INIT_CALL(_master) \
MPFR_ONCE_CALL((_master)->once, (_master)->init_once)
#define MPFR_DEFERRED_INIT_SLAVE_DECL() \
MPFR_ONCE_DECL(once) \
void (*init_once)(void);
#define MPFR_DEFERRED_INIT_SLAVE_VALUE(_id) \
, MPFR_ONCE_INIT_VALUE, mpfr_once_ ## _id ## _init_func
#endif
#else
/* No need */
#define MPFR_DEFERRED_INIT_MASTER_DECL(_id_lock, _init, _clear)
#define MPFR_DEFERRED_INIT_CALL(_master) do {} while (0)
#define MPFR_DEFERRED_INIT_SLAVE_DECL()
#define MPFR_DEFERRED_INIT_SLAVE_VALUE(_id)
#endif
/**************************************************************************/
#endif
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