8d9254fc8a
From-SVN: r279813
569 lines
13 KiB
C
569 lines
13 KiB
C
/* Threads compatibility routines for libgcc2 and libobjc. */
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/* Compile this one with gcc. */
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/* Copyright (C) 1997-2020 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef GCC_GTHR_DCE_H
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#define GCC_GTHR_DCE_H
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/* If _DCE_THREADS is not defined, then we're building the single
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threaded version of the libraries and do not want to reference
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anything related to pthreads or dce. */
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#ifndef _DCE_THREADS
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#include "gthr-single.h"
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#else
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/* DCE threads interface.
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DCE threads are based on POSIX threads draft 4, and many things
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have changed since then. */
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/* Make sure CONST_CAST2 (original in system.h) is defined. */
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#ifndef CONST_CAST2
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#ifdef __cplusplus
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#define CONST_CAST2(TOTYPE,FROMTYPE,X) (const_cast<TOTYPE> (X))
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#else
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#define CONST_CAST2(TOTYPE,FROMTYPE,X) ((__extension__(union {FROMTYPE _q; TOTYPE _nq;})(X))._nq)
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#endif
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#endif
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#define __GTHREADS 1
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#include <pthread.h>
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typedef pthread_key_t __gthread_key_t;
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typedef pthread_once_t __gthread_once_t;
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typedef pthread_mutex_t __gthread_mutex_t;
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typedef pthread_mutex_t __gthread_recursive_mutex_t;
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#define __GTHREAD_ONCE_INIT pthread_once_init
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#define __GTHREAD_MUTEX_INIT_FUNCTION __gthread_mutex_init_function
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#define __GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION __gthread_recursive_mutex_init_function
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#define __GTHREAD_MUTEX_INIT_DEFAULT pthread_once_init
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#if SUPPORTS_WEAK && GTHREAD_USE_WEAK
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# define __gthrw(name) \
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static __typeof(name) __gthrw_ ## name __attribute__ ((__weakref__(#name)));
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# define __gthrw_(name) __gthrw_ ## name
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#else
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# define __gthrw(name)
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# define __gthrw_(name) name
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#endif
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__gthrw(pthread_once)
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__gthrw(pthread_keycreate)
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__gthrw(pthread_getspecific)
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__gthrw(pthread_setspecific)
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__gthrw(pthread_create)
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__gthrw(pthread_mutex_init)
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__gthrw(pthread_mutex_destroy)
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__gthrw(pthread_mutex_lock)
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__gthrw(pthread_mutex_trylock)
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__gthrw(pthread_mutex_unlock)
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__gthrw(pthread_mutexattr_create)
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__gthrw(pthread_mutexattr_setkind_np)
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__gthrw(pthread_mutexattr_delete)
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#ifdef _LIBOBJC
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/* Objective-C. */
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__gthrw(pthread_cond_broadcast)
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__gthrw(pthread_cond_destroy)
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__gthrw(pthread_cond_init)
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__gthrw(pthread_cond_signal)
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__gthrw(pthread_cond_wait)
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__gthrw(pthread_exit)
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#ifdef pthread_getunique_np
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# define __gthrw_pthread_getunique_np pthread_getunique_np
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#else
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__gthrw(pthread_getunique_np)
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# define __gthrw_pthread_getunique_np __gthrw_(pthread_getunique_np)
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#endif
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__gthrw(pthread_mutex_destroy)
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__gthrw(pthread_self)
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__gthrw(pthread_yield)
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#endif
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#if SUPPORTS_WEAK && GTHREAD_USE_WEAK
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static inline int
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__gthread_active_p (void)
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{
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static void *const __gthread_active_ptr = (void *) &__gthrw_(pthread_create);
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return __gthread_active_ptr != 0;
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}
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#else /* not SUPPORTS_WEAK */
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static inline int
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__gthread_active_p (void)
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{
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return 1;
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}
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#endif /* SUPPORTS_WEAK */
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#ifdef _LIBOBJC
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/* Key structure for maintaining thread specific storage */
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static pthread_key_t _objc_thread_storage;
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/* Thread local storage for a single thread */
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static void *thread_local_storage = NULL;
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/* Backend initialization functions */
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/* Initialize the threads subsystem. */
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static inline int
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__gthread_objc_init_thread_system (void)
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{
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if (__gthread_active_p ())
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/* Initialize the thread storage key. */
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return __gthrw_(pthread_keycreate) (&_objc_thread_storage, NULL);
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else
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return -1;
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}
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/* Close the threads subsystem. */
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static inline int
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__gthread_objc_close_thread_system (void)
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{
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if (__gthread_active_p ())
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return 0;
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else
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return -1;
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}
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/* Backend thread functions */
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/* Create a new thread of execution. */
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static inline objc_thread_t
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__gthread_objc_thread_detach (void (*func)(void *), void *arg)
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{
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objc_thread_t thread_id;
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pthread_t new_thread_handle;
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if (!__gthread_active_p ())
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return NULL;
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if (!(__gthrw_(pthread_create) (&new_thread_handle, pthread_attr_default,
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(void *) func, arg)))
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{
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/* ??? May not work! (64bit) */
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thread_id = *(objc_thread_t *) &new_thread_handle;
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pthread_detach (&new_thread_handle); /* Fully detach thread. */
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}
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else
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thread_id = NULL;
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return thread_id;
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}
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/* Set the current thread's priority. */
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static inline int
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__gthread_objc_thread_set_priority (int priority)
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{
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int sys_priority = 0;
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if (!__gthread_active_p ())
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return -1;
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switch (priority)
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{
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case OBJC_THREAD_INTERACTIVE_PRIORITY:
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sys_priority = (PRI_FG_MIN_NP + PRI_FG_MAX_NP) / 2;
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break;
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default:
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case OBJC_THREAD_BACKGROUND_PRIORITY:
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sys_priority = (PRI_BG_MIN_NP + PRI_BG_MAX_NP) / 2;
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break;
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case OBJC_THREAD_LOW_PRIORITY:
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sys_priority = (PRI_BG_MIN_NP + PRI_BG_MAX_NP) / 2;
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break;
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}
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/* Change the priority. */
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if (pthread_setprio (__gthrw_(pthread_self) (), sys_priority) >= 0)
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return 0;
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else
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/* Failed */
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return -1;
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}
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/* Return the current thread's priority. */
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static inline int
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__gthread_objc_thread_get_priority (void)
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{
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int sys_priority;
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if (__gthread_active_p ())
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{
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if ((sys_priority = pthread_getprio (__gthrw_(pthread_self) ())) >= 0)
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{
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if (sys_priority >= PRI_FG_MIN_NP
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&& sys_priority <= PRI_FG_MAX_NP)
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return OBJC_THREAD_INTERACTIVE_PRIORITY;
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if (sys_priority >= PRI_BG_MIN_NP
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&& sys_priority <= PRI_BG_MAX_NP)
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return OBJC_THREAD_BACKGROUND_PRIORITY;
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return OBJC_THREAD_LOW_PRIORITY;
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}
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/* Failed */
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return -1;
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}
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else
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return OBJC_THREAD_INTERACTIVE_PRIORITY;
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}
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/* Yield our process time to another thread. */
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static inline void
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__gthread_objc_thread_yield (void)
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{
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if (__gthread_active_p ())
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__gthrw_(pthread_yield) ();
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}
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/* Terminate the current thread. */
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static inline int
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__gthread_objc_thread_exit (void)
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{
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if (__gthread_active_p ())
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/* exit the thread */
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__gthrw_(pthread_exit) (&__objc_thread_exit_status);
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/* Failed if we reached here */
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return -1;
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}
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/* Returns an integer value which uniquely describes a thread. */
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static inline objc_thread_t
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__gthread_objc_thread_id (void)
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{
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if (__gthread_active_p ())
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{
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pthread_t self = __gthrw_(pthread_self) ();
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return (objc_thread_t) __gthrw_pthread_getunique_np (&self);
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}
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else
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return (objc_thread_t) 1;
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}
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/* Sets the thread's local storage pointer. */
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static inline int
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__gthread_objc_thread_set_data (void *value)
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{
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if (__gthread_active_p ())
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return __gthrw_(pthread_setspecific) (_objc_thread_storage, value);
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else
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{
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thread_local_storage = value;
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return 0;
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}
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}
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/* Returns the thread's local storage pointer. */
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static inline void *
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__gthread_objc_thread_get_data (void)
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{
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void *value = NULL;
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if (__gthread_active_p ())
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{
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if (!(__gthrw_(pthread_getspecific) (_objc_thread_storage, &value)))
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return value;
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return NULL;
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}
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else
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return thread_local_storage;
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}
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/* Backend mutex functions */
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/* Allocate a mutex. */
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static inline int
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__gthread_objc_mutex_allocate (objc_mutex_t mutex)
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{
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if (__gthread_active_p ())
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{
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mutex->backend = objc_malloc (sizeof (pthread_mutex_t));
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if (__gthrw_(pthread_mutex_init) ((pthread_mutex_t *) mutex->backend,
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pthread_mutexattr_default))
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{
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objc_free (mutex->backend);
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mutex->backend = NULL;
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return -1;
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}
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}
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return 0;
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}
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/* Deallocate a mutex. */
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static inline int
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__gthread_objc_mutex_deallocate (objc_mutex_t mutex)
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{
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if (__gthread_active_p ())
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{
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if (__gthrw_(pthread_mutex_destroy) ((pthread_mutex_t *) mutex->backend))
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return -1;
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objc_free (mutex->backend);
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mutex->backend = NULL;
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}
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return 0;
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}
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/* Grab a lock on a mutex. */
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static inline int
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__gthread_objc_mutex_lock (objc_mutex_t mutex)
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{
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if (__gthread_active_p ())
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return __gthrw_(pthread_mutex_lock) ((pthread_mutex_t *) mutex->backend);
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else
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return 0;
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}
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/* Try to grab a lock on a mutex. */
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static inline int
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__gthread_objc_mutex_trylock (objc_mutex_t mutex)
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{
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if (__gthread_active_p ()
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&& __gthrw_(pthread_mutex_trylock) ((pthread_mutex_t *) mutex->backend) != 1)
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return -1;
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return 0;
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}
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/* Unlock the mutex */
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static inline int
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__gthread_objc_mutex_unlock (objc_mutex_t mutex)
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{
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if (__gthread_active_p ())
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return __gthrw_(pthread_mutex_unlock) ((pthread_mutex_t *) mutex->backend);
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else
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return 0;
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}
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/* Backend condition mutex functions */
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/* Allocate a condition. */
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static inline int
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__gthread_objc_condition_allocate (objc_condition_t condition
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__attribute__ ((__unused__)))
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{
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if (__gthread_active_p ())
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/* Unimplemented. */
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return -1;
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else
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return 0;
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}
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/* Deallocate a condition. */
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static inline int
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__gthread_objc_condition_deallocate (objc_condition_t condition
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__attribute__ ((__unused__)))
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{
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if (__gthread_active_p ())
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/* Unimplemented. */
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return -1;
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else
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return 0;
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}
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/* Wait on the condition */
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static inline int
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__gthread_objc_condition_wait (objc_condition_t condition
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__attribute__ ((__unused__)),
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objc_mutex_t mutex __attribute__ ((__unused__)))
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{
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if (__gthread_active_p ())
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/* Unimplemented. */
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return -1;
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else
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return 0;
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}
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/* Wake up all threads waiting on this condition. */
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static inline int
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__gthread_objc_condition_broadcast (objc_condition_t condition
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__attribute__ ((__unused__)))
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{
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if (__gthread_active_p ())
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/* Unimplemented. */
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return -1;
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else
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return 0;
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}
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/* Wake up one thread waiting on this condition. */
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static inline int
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__gthread_objc_condition_signal (objc_condition_t condition
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__attribute__ ((__unused__)))
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{
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if (__gthread_active_p ())
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/* Unimplemented. */
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return -1;
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else
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return 0;
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}
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#else /* _LIBOBJC */
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static inline int
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__gthread_once (__gthread_once_t *__once, void (*__func) (void))
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{
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if (__gthread_active_p ())
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return __gthrw_(pthread_once) (__once, __func);
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else
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return -1;
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}
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static inline int
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__gthread_key_create (__gthread_key_t *__key, void (*__dtor) (void *))
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{
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return __gthrw_(pthread_keycreate) (__key, __dtor);
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}
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static inline int
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__gthread_key_delete (__gthread_key_t __key __attribute__ ((__unused__)))
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{
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/* Operation is not supported. */
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return -1;
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}
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static inline void *
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__gthread_getspecific (__gthread_key_t __key)
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{
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void *__ptr;
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if (__gthrw_(pthread_getspecific) (__key, &__ptr) == 0)
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return __ptr;
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else
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return 0;
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}
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static inline int
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__gthread_setspecific (__gthread_key_t __key, const void *__ptr)
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{
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return __gthrw_(pthread_setspecific)
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(__key, CONST_CAST2(void *, const void *, __ptr));
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}
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static inline void
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__gthread_mutex_init_function (__gthread_mutex_t *__mutex)
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{
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if (__gthread_active_p ())
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__gthrw_(pthread_mutex_init) (__mutex, pthread_mutexattr_default);
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}
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static inline int
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__gthread_mutex_destroy (__gthread_mutex_t *__mutex)
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{
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if (__gthread_active_p ())
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return __gthrw_(pthread_mutex_destroy) (__mutex);
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else
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return 0;
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}
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static inline int
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__gthread_mutex_lock (__gthread_mutex_t *__mutex)
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{
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if (__gthread_active_p ())
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return __gthrw_(pthread_mutex_lock) (__mutex);
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else
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return 0;
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}
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static inline int
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__gthread_mutex_trylock (__gthread_mutex_t *__mutex)
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{
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if (__gthread_active_p ())
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return __gthrw_(pthread_mutex_trylock) (__mutex);
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else
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return 0;
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}
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static inline int
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__gthread_mutex_unlock (__gthread_mutex_t *__mutex)
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{
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if (__gthread_active_p ())
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return __gthrw_(pthread_mutex_unlock) (__mutex);
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else
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return 0;
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}
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static inline int
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__gthread_recursive_mutex_init_function (__gthread_recursive_mutex_t *__mutex)
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{
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if (__gthread_active_p ())
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{
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pthread_mutexattr_t __attr;
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int __r;
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__r = __gthrw_(pthread_mutexattr_create) (&__attr);
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if (!__r)
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__r = __gthrw_(pthread_mutexattr_setkind_np) (&__attr,
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MUTEX_RECURSIVE_NP);
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if (!__r)
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__r = __gthrw_(pthread_mutex_init) (__mutex, __attr);
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if (!__r)
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__r = __gthrw_(pthread_mutexattr_delete) (&__attr);
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return __r;
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}
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return 0;
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}
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static inline int
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__gthread_recursive_mutex_lock (__gthread_recursive_mutex_t *__mutex)
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{
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return __gthread_mutex_lock (__mutex);
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}
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static inline int
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__gthread_recursive_mutex_trylock (__gthread_recursive_mutex_t *__mutex)
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{
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return __gthread_mutex_trylock (__mutex);
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|
}
|
|
|
|
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 */
|