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/* Threads compatibility routines for libgcc2 and libobjc. */
/* Compile this one with gcc. */
/* Copyright (C) 1997-2022 Free Software Foundation, Inc.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3, or (at your option) any later
version.
GCC 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 General Public License
for more details.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
#ifndef GCC_GTHR_DCE_H
#define GCC_GTHR_DCE_H
/* If _DCE_THREADS is not defined, then we're building the single
threaded version of the libraries and do not want to reference
anything related to pthreads or dce. */
#ifndef _DCE_THREADS
#include "gthr-single.h"
#else
/* DCE threads interface.
DCE threads are based on POSIX threads draft 4, and many things
have changed since then. */
/* Make sure CONST_CAST2 (original in system.h) is defined. */
#ifndef CONST_CAST2
#ifdef __cplusplus
#define CONST_CAST2(TOTYPE,FROMTYPE,X) (const_cast<TOTYPE> (X))
#else
#define CONST_CAST2(TOTYPE,FROMTYPE,X) ((__extension__(union {FROMTYPE _q; TOTYPE _nq;})(X))._nq)
#endif
#endif
#define __GTHREADS 1
#include <pthread.h>
typedef pthread_key_t __gthread_key_t;
typedef pthread_once_t __gthread_once_t;
typedef pthread_mutex_t __gthread_mutex_t;
typedef pthread_mutex_t __gthread_recursive_mutex_t;
#define __GTHREAD_ONCE_INIT pthread_once_init
#define __GTHREAD_MUTEX_INIT_FUNCTION __gthread_mutex_init_function
#define __GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION __gthread_recursive_mutex_init_function
#define __GTHREAD_MUTEX_INIT_DEFAULT pthread_once_init
#if SUPPORTS_WEAK && GTHREAD_USE_WEAK
# define __gthrw(name) \
static __typeof(name) __gthrw_ ## name __attribute__ ((__weakref__(#name)));
# define __gthrw_(name) __gthrw_ ## name
#else
# define __gthrw(name)
# define __gthrw_(name) name
#endif
__gthrw(pthread_once)
__gthrw(pthread_keycreate)
__gthrw(pthread_getspecific)
__gthrw(pthread_setspecific)
__gthrw(pthread_create)
__gthrw(pthread_mutex_init)
__gthrw(pthread_mutex_destroy)
__gthrw(pthread_mutex_lock)
__gthrw(pthread_mutex_trylock)
__gthrw(pthread_mutex_unlock)
__gthrw(pthread_mutexattr_create)
__gthrw(pthread_mutexattr_setkind_np)
__gthrw(pthread_mutexattr_delete)
#ifdef _LIBOBJC
/* Objective-C. */
__gthrw(pthread_cond_broadcast)
__gthrw(pthread_cond_destroy)
__gthrw(pthread_cond_init)
__gthrw(pthread_cond_signal)
__gthrw(pthread_cond_wait)
__gthrw(pthread_exit)
#ifdef pthread_getunique_np
# define __gthrw_pthread_getunique_np pthread_getunique_np
#else
__gthrw(pthread_getunique_np)
# define __gthrw_pthread_getunique_np __gthrw_(pthread_getunique_np)
#endif
__gthrw(pthread_mutex_destroy)
__gthrw(pthread_self)
__gthrw(pthread_yield)
#endif
#if SUPPORTS_WEAK && GTHREAD_USE_WEAK
static inline int
__gthread_active_p (void)
{
static void *const __gthread_active_ptr = (void *) &__gthrw_(pthread_create);
return __gthread_active_ptr != 0;
}
#else /* not SUPPORTS_WEAK */
static inline int
__gthread_active_p (void)
{
return 1;
}
#endif /* SUPPORTS_WEAK */
#ifdef _LIBOBJC
/* Key structure for maintaining thread specific storage */
static pthread_key_t _objc_thread_storage;
/* Thread local storage for a single thread */
static void *thread_local_storage = NULL;
/* Backend initialization functions */
/* Initialize the threads subsystem. */
static inline int
__gthread_objc_init_thread_system (void)
{
if (__gthread_active_p ())
/* Initialize the thread storage key. */
return __gthrw_(pthread_keycreate) (&_objc_thread_storage, NULL);
else
return -1;
}
/* Close the threads subsystem. */
static inline int
__gthread_objc_close_thread_system (void)
{
if (__gthread_active_p ())
return 0;
else
return -1;
}
/* Backend thread functions */
/* Create a new thread of execution. */
static inline objc_thread_t
__gthread_objc_thread_detach (void (*func)(void *), void *arg)
{
objc_thread_t thread_id;
pthread_t new_thread_handle;
if (!__gthread_active_p ())
return NULL;
if (!(__gthrw_(pthread_create) (&new_thread_handle, pthread_attr_default,
(void *) func, arg)))
{
/* ??? May not work! (64bit) */
thread_id = *(objc_thread_t *) &new_thread_handle;
pthread_detach (&new_thread_handle); /* Fully detach thread. */
}
else
thread_id = NULL;
return thread_id;
}
/* Set the current thread's priority. */
static inline int
__gthread_objc_thread_set_priority (int priority)
{
int sys_priority = 0;
if (!__gthread_active_p ())
return -1;
switch (priority)
{
case OBJC_THREAD_INTERACTIVE_PRIORITY:
sys_priority = (PRI_FG_MIN_NP + PRI_FG_MAX_NP) / 2;
break;
default:
case OBJC_THREAD_BACKGROUND_PRIORITY:
sys_priority = (PRI_BG_MIN_NP + PRI_BG_MAX_NP) / 2;
break;
case OBJC_THREAD_LOW_PRIORITY:
sys_priority = (PRI_BG_MIN_NP + PRI_BG_MAX_NP) / 2;
break;
}
/* Change the priority. */
if (pthread_setprio (__gthrw_(pthread_self) (), sys_priority) >= 0)
return 0;
else
/* Failed */
return -1;
}
/* Return the current thread's priority. */
static inline int
__gthread_objc_thread_get_priority (void)
{
int sys_priority;
if (__gthread_active_p ())
{
if ((sys_priority = pthread_getprio (__gthrw_(pthread_self) ())) >= 0)
{
if (sys_priority >= PRI_FG_MIN_NP
&& sys_priority <= PRI_FG_MAX_NP)
return OBJC_THREAD_INTERACTIVE_PRIORITY;
if (sys_priority >= PRI_BG_MIN_NP
&& sys_priority <= PRI_BG_MAX_NP)
return OBJC_THREAD_BACKGROUND_PRIORITY;
return OBJC_THREAD_LOW_PRIORITY;
}
/* Failed */
return -1;
}
else
return OBJC_THREAD_INTERACTIVE_PRIORITY;
}
/* Yield our process time to another thread. */
static inline void
__gthread_objc_thread_yield (void)
{
if (__gthread_active_p ())
__gthrw_(pthread_yield) ();
}
/* Terminate the current thread. */
static inline int
__gthread_objc_thread_exit (void)
{
if (__gthread_active_p ())
/* exit the thread */
__gthrw_(pthread_exit) (&__objc_thread_exit_status);
/* Failed if we reached here */
return -1;
}
/* Returns an integer value which uniquely describes a thread. */
static inline objc_thread_t
__gthread_objc_thread_id (void)
{
if (__gthread_active_p ())
{
pthread_t self = __gthrw_(pthread_self) ();
return (objc_thread_t) __gthrw_pthread_getunique_np (&self);
}
else
return (objc_thread_t) 1;
}
/* Sets the thread's local storage pointer. */
static inline int
__gthread_objc_thread_set_data (void *value)
{
if (__gthread_active_p ())
return __gthrw_(pthread_setspecific) (_objc_thread_storage, value);
else
{
thread_local_storage = value;
return 0;
}
}
/* Returns the thread's local storage pointer. */
static inline void *
__gthread_objc_thread_get_data (void)
{
void *value = NULL;
if (__gthread_active_p ())
{
if (!(__gthrw_(pthread_getspecific) (_objc_thread_storage, &value)))
return value;
return NULL;
}
else
return thread_local_storage;
}
/* Backend mutex functions */
/* Allocate a mutex. */
static inline int
__gthread_objc_mutex_allocate (objc_mutex_t mutex)
{
if (__gthread_active_p ())
{
mutex->backend = objc_malloc (sizeof (pthread_mutex_t));
if (__gthrw_(pthread_mutex_init) ((pthread_mutex_t *) mutex->backend,
pthread_mutexattr_default))
{
objc_free (mutex->backend);
mutex->backend = NULL;
return -1;
}
}
return 0;
}
/* Deallocate a mutex. */
static inline int
__gthread_objc_mutex_deallocate (objc_mutex_t mutex)
{
if (__gthread_active_p ())
{
if (__gthrw_(pthread_mutex_destroy) ((pthread_mutex_t *) mutex->backend))
return -1;
objc_free (mutex->backend);
mutex->backend = NULL;
}
return 0;
}
/* Grab a lock on a mutex. */
static inline int
__gthread_objc_mutex_lock (objc_mutex_t mutex)
{
if (__gthread_active_p ())
return __gthrw_(pthread_mutex_lock) ((pthread_mutex_t *) mutex->backend);
else
return 0;
}
/* Try to grab a lock on a mutex. */
static inline int
__gthread_objc_mutex_trylock (objc_mutex_t mutex)
{
if (__gthread_active_p ()
&& __gthrw_(pthread_mutex_trylock) ((pthread_mutex_t *) mutex->backend) != 1)
return -1;
return 0;
}
/* Unlock the mutex */
static inline int
__gthread_objc_mutex_unlock (objc_mutex_t mutex)
{
if (__gthread_active_p ())
return __gthrw_(pthread_mutex_unlock) ((pthread_mutex_t *) mutex->backend);
else
return 0;
}
/* Backend condition mutex functions */
/* Allocate a condition. */
static inline int
__gthread_objc_condition_allocate (objc_condition_t condition
__attribute__ ((__unused__)))
{
if (__gthread_active_p ())
/* Unimplemented. */
return -1;
else
return 0;
}
/* Deallocate a condition. */
static inline int
__gthread_objc_condition_deallocate (objc_condition_t condition
__attribute__ ((__unused__)))
{
if (__gthread_active_p ())
/* Unimplemented. */
return -1;
else
return 0;
}
/* Wait on the condition */
static inline int
__gthread_objc_condition_wait (objc_condition_t condition
__attribute__ ((__unused__)),
objc_mutex_t mutex __attribute__ ((__unused__)))
{
if (__gthread_active_p ())
/* Unimplemented. */
return -1;
else
return 0;
}
/* Wake up all threads waiting on this condition. */
static inline int
__gthread_objc_condition_broadcast (objc_condition_t condition
__attribute__ ((__unused__)))
{
if (__gthread_active_p ())
/* Unimplemented. */
return -1;
else
return 0;
}
/* Wake up one thread waiting on this condition. */
static inline int
__gthread_objc_condition_signal (objc_condition_t condition
__attribute__ ((__unused__)))
{
if (__gthread_active_p ())
/* Unimplemented. */
return -1;
else
return 0;
}
#else /* _LIBOBJC */
static inline int
__gthread_once (__gthread_once_t *__once, void (*__func) (void))
{
if (__gthread_active_p ())
return __gthrw_(pthread_once) (__once, __func);
else
return -1;
}
static inline int
__gthread_key_create (__gthread_key_t *__key, void (*__dtor) (void *))
{
return __gthrw_(pthread_keycreate) (__key, __dtor);
}
static inline int
__gthread_key_delete (__gthread_key_t __key __attribute__ ((__unused__)))
{
/* Operation is not supported. */
return -1;
}
static inline void *
__gthread_getspecific (__gthread_key_t __key)
{
void *__ptr;
if (__gthrw_(pthread_getspecific) (__key, &__ptr) == 0)
return __ptr;
else
return 0;
}
static inline int
__gthread_setspecific (__gthread_key_t __key, const void *__ptr)
{
return __gthrw_(pthread_setspecific)
(__key, CONST_CAST2(void *, const void *, __ptr));
}
static inline void
__gthread_mutex_init_function (__gthread_mutex_t *__mutex)
{
if (__gthread_active_p ())
__gthrw_(pthread_mutex_init) (__mutex, pthread_mutexattr_default);
}
static inline int
__gthread_mutex_destroy (__gthread_mutex_t *__mutex)
{
if (__gthread_active_p ())
return __gthrw_(pthread_mutex_destroy) (__mutex);
else
return 0;
}
static inline int
__gthread_mutex_lock (__gthread_mutex_t *__mutex)
{
if (__gthread_active_p ())
return __gthrw_(pthread_mutex_lock) (__mutex);
else
return 0;
}
static inline int
__gthread_mutex_trylock (__gthread_mutex_t *__mutex)
{
if (__gthread_active_p ())
return __gthrw_(pthread_mutex_trylock) (__mutex);
else
return 0;
}
static inline int
__gthread_mutex_unlock (__gthread_mutex_t *__mutex)
{
if (__gthread_active_p ())
return __gthrw_(pthread_mutex_unlock) (__mutex);
else
return 0;
}
static inline int
__gthread_recursive_mutex_init_function (__gthread_recursive_mutex_t *__mutex)
{
if (__gthread_active_p ())
{
pthread_mutexattr_t __attr;
int __r;
__r = __gthrw_(pthread_mutexattr_create) (&__attr);
if (!__r)
__r = __gthrw_(pthread_mutexattr_setkind_np) (&__attr,
MUTEX_RECURSIVE_NP);
if (!__r)
__r = __gthrw_(pthread_mutex_init) (__mutex, __attr);
if (!__r)
__r = __gthrw_(pthread_mutexattr_delete) (&__attr);
return __r;
}
return 0;
}
static inline int
__gthread_recursive_mutex_lock (__gthread_recursive_mutex_t *__mutex)
{
return __gthread_mutex_lock (__mutex);
}
static inline int
__gthread_recursive_mutex_trylock (__gthread_recursive_mutex_t *__mutex)
{
return __gthread_mutex_trylock (__mutex);
}
static inline int
__gthread_recursive_mutex_unlock (__gthread_recursive_mutex_t *__mutex)
{
return __gthread_mutex_unlock (__mutex);
}
static inline int
__gthread_recursive_mutex_destroy (__gthread_recursive_mutex_t *__mutex)
{
return __gthread_mutex_destroy (__mutex);
}
#endif /* _LIBOBJC */
#endif
#endif /* ! GCC_GTHR_DCE_H */
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