1 // -*- C++ -*- Manage the thread-local exception globals.
2 // Copyright (C) 2001, 2004 Free Software Foundation, Inc.
4 // This file is part of GCC.
6 // GCC is free software; you can redistribute it and/or modify
7 // it under the terms of the GNU General Public License as published by
8 // the Free Software Foundation; either version 2, or (at your option)
11 // GCC is distributed in the hope that it will be useful,
12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 // GNU General Public License for more details.
16 // You should have received a copy of the GNU General Public License
17 // along with GCC; see the file COPYING. If not, write to
18 // the Free Software Foundation, 51 Franklin Street, Fifth Floor,
19 // Boston, MA 02110-1301, USA.
21 // As a special exception, you may use this file as part of a free software
22 // library without restriction. Specifically, if other files instantiate
23 // templates or use macros or inline functions from this file, or you compile
24 // this file and link it with other files to produce an executable, this
25 // file does not by itself cause the resulting executable to be covered by
26 // the GNU General Public License. This exception does not however
27 // invalidate any other reasons why the executable file might be covered by
28 // the GNU General Public License.
33 #include "unwind-cxx.h"
34 #include "bits/c++config.h"
35 #include "bits/gthr.h"
37 using namespace __cxxabiv1;
40 // Single-threaded fallback buffer.
41 static __cxa_eh_globals globals_static;
44 static __gthread_key_t globals_key;
45 static int use_thread_key = -1;
48 get_globals_dtor (void *ptr)
52 __cxa_exception *exn, *next;
53 exn = ((__cxa_eh_globals *) ptr)->caughtExceptions;
56 next = exn->nextException;
57 _Unwind_DeleteException (&exn->unwindHeader);
68 (__gthread_key_create (&globals_key, get_globals_dtor) == 0);
72 get_globals_init_once ()
74 static __gthread_once_t once = __GTHREAD_ONCE_INIT;
75 if (__gthread_once (&once, get_globals_init) != 0
76 || use_thread_key < 0)
81 extern "C" __cxa_eh_globals *
82 __cxxabiv1::__cxa_get_globals_fast () throw()
86 return (__cxa_eh_globals *) __gthread_getspecific (globals_key);
88 return &globals_static;
90 return &globals_static;
94 extern "C" __cxa_eh_globals *
95 __cxxabiv1::__cxa_get_globals () throw()
100 if (use_thread_key == 0)
101 return &globals_static;
103 if (use_thread_key < 0)
105 get_globals_init_once ();
107 // Make sure use_thread_key got initialized.
108 if (use_thread_key == 0)
109 return &globals_static;
112 g = (__cxa_eh_globals *) __gthread_getspecific (globals_key);
115 if ((g = (__cxa_eh_globals *)
116 std::malloc (sizeof (__cxa_eh_globals))) == 0
117 || __gthread_setspecific (globals_key, (void *) g) != 0)
119 g->caughtExceptions = 0;
120 g->uncaughtExceptions = 0;
125 return &globals_static;