1 // Copyright (C) 2012-2013 Free Software Foundation, Inc.
3 // This file is part of GCC.
5 // GCC is free software; you can redistribute it and/or modify
6 // it under the terms of the GNU General Public License as published by
7 // the Free Software Foundation; either version 3, or (at your option)
10 // GCC is distributed in the hope that it will be useful,
11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 // GNU General Public License for more details.
15 // Under Section 7 of GPL version 3, you are granted additional
16 // permissions described in the GCC Runtime Library Exception, version
17 // 3.1, as published by the Free Software Foundation.
19 // You should have received a copy of the GNU General Public License and
20 // a copy of the GCC Runtime Library Exception along with this program;
21 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
22 // <http://www.gnu.org/licenses/>.
27 #include "bits/gthr.h"
29 #if HAVE___CXA_THREAD_ATEXIT_IMPL
31 extern "C" int __cxa_thread_atexit_impl (void (*func) (void *),
34 __cxxabiv1::__cxa_thread_atexit (void (*dtor)(void *),
35 void *obj, void *dso_handle)
38 return __cxa_thread_atexit_impl (dtor, obj, dso_handle);
41 #else /* HAVE___CXA_THREAD_ATEXIT_IMPL */
44 // One element in a singly-linked stack of cleanups.
47 void (*destructor)(void *);
52 // Keep a per-thread list of cleanups in gthread_key storage.
54 // But also support non-threaded mode.
57 // Run the specified stack of cleanups.
60 elt *e = static_cast<elt*>(p);
64 e->destructor (e->object);
70 // Run the stack of cleanups for the current thread.
74 if (__gthread_active_p ())
76 e = __gthread_getspecific (key);
77 __gthread_setspecific (key, NULL);
87 // Initialize the key for the cleanup stack. We use a static local for
88 // key init/delete rather than atexit so that delete is run on dlclose.
91 key_s() { __gthread_key_create (&key, run); }
92 ~key_s() { __gthread_key_delete (key); }
95 // Also make sure the destructors are run by std::exit.
96 // FIXME TLS cleanups should run before static cleanups and atexit
103 __cxxabiv1::__cxa_thread_atexit (void (*dtor)(void *), void *obj, void */*dso_handle*/)
106 // Do this initialization once.
107 if (__gthread_active_p ())
109 // When threads are active use __gthread_once.
110 static __gthread_once_t once = __GTHREAD_ONCE_INIT;
111 __gthread_once (&once, key_init);
115 // And when threads aren't active use a static local guard.
125 if (__gthread_active_p ())
126 first = static_cast<elt*>(__gthread_getspecific (key));
128 first = single_thread;
130 elt *new_elt = new (std::nothrow) elt;
133 new_elt->destructor = dtor;
134 new_elt->object = obj;
135 new_elt->next = first;
137 if (__gthread_active_p ())
138 __gthread_setspecific (key, new_elt);
140 single_thread = new_elt;
145 #endif /* HAVE___CXA_THREAD_ATEXIT_IMPL */