128 lines
3.2 KiB
C++
128 lines
3.2 KiB
C++
// -*- C++ -*- Manage the thread-local exception globals.
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// Copyright (C) 2001, 2004 Free Software Foundation, Inc.
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//
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// This file is part of GCC.
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//
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// GCC is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2, or (at your option)
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// any later version.
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//
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// GCC is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with GCC; see the file COPYING. If not, write to
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// the Free Software Foundation, 59 Temple Place - Suite 330,
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// Boston, MA 02111-1307, USA.
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// As a special exception, you may use this file as part of a free software
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// library without restriction. Specifically, if other files instantiate
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// templates or use macros or inline functions from this file, or you compile
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// this file and link it with other files to produce an executable, this
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// file does not by itself cause the resulting executable to be covered by
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// the GNU General Public License. This exception does not however
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// invalidate any other reasons why the executable file might be covered by
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// the GNU General Public License.
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#include <exception>
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#include <cstdlib>
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#include "unwind-cxx.h"
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#include "bits/c++config.h"
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#include "bits/gthr.h"
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using namespace __cxxabiv1;
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// Single-threaded fallback buffer.
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static __cxa_eh_globals globals_static;
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#if __GTHREADS
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static __gthread_key_t globals_key;
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static int use_thread_key = -1;
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static void
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get_globals_dtor (void *ptr)
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{
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if (ptr)
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{
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__cxa_exception *exn, *next;
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exn = ((__cxa_eh_globals *) ptr)->caughtExceptions;
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while (exn)
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{
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next = exn->nextException;
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_Unwind_DeleteException (&exn->unwindHeader);
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exn = next;
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}
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std::free (ptr);
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}
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}
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static void
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get_globals_init ()
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{
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use_thread_key =
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(__gthread_key_create (&globals_key, get_globals_dtor) == 0);
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}
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static void
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get_globals_init_once ()
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{
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static __gthread_once_t once = __GTHREAD_ONCE_INIT;
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if (__gthread_once (&once, get_globals_init) != 0
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|| use_thread_key < 0)
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use_thread_key = 0;
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}
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#endif
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extern "C" __cxa_eh_globals *
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__cxa_get_globals_fast () throw()
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{
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#if __GTHREADS
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if (use_thread_key)
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return (__cxa_eh_globals *) __gthread_getspecific (globals_key);
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else
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return &globals_static;
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#else
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return &globals_static;
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#endif
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}
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extern "C" __cxa_eh_globals *
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__cxa_get_globals () throw()
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{
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#if __GTHREADS
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__cxa_eh_globals *g;
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if (use_thread_key == 0)
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return &globals_static;
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if (use_thread_key < 0)
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{
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get_globals_init_once ();
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// Make sure use_thread_key got initialized.
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if (use_thread_key == 0)
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return &globals_static;
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}
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g = (__cxa_eh_globals *) __gthread_getspecific (globals_key);
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if (! g)
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{
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if ((g = (__cxa_eh_globals *)
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std::malloc (sizeof (__cxa_eh_globals))) == 0
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|| __gthread_setspecific (globals_key, (void *) g) != 0)
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std::terminate ();
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g->caughtExceptions = 0;
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g->uncaughtExceptions = 0;
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}
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return g;
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#else
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return &globals_static;
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#endif
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}
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