| /* |
| Copyright 2005-2010 Intel Corporation. All Rights Reserved. |
| |
| This file is part of Threading Building Blocks. |
| |
| Threading Building Blocks is free software; you can redistribute it |
| and/or modify it under the terms of the GNU General Public License |
| version 2 as published by the Free Software Foundation. |
| |
| Threading Building Blocks 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. |
| |
| You should have received a copy of the GNU General Public License |
| along with Threading Building Blocks; if not, write to the Free Software |
| Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| |
| As a special exception, you may use this file as part of a free software |
| library without restriction. Specifically, if other files instantiate |
| templates or use macros or inline functions from this file, or you compile |
| this file and link it with other files to produce an executable, this |
| file does not by itself cause the resulting executable to be covered by |
| the GNU General Public License. This exception does not however |
| invalidate any other reasons why the executable file might be covered by |
| the GNU General Public License. |
| */ |
| |
| #include "tbb/tbb_machine.h" |
| #include "tbb/spin_mutex.h" |
| #include "itt_notify.h" |
| #include "tbb_misc.h" |
| |
| namespace tbb { |
| |
| void spin_mutex::scoped_lock::internal_acquire( spin_mutex& m ) { |
| __TBB_ASSERT( !my_mutex, "already holding a lock on a spin_mutex" ); |
| ITT_NOTIFY(sync_prepare, &m); |
| my_unlock_value = __TBB_LockByte(m.flag); |
| my_mutex = &m; |
| ITT_NOTIFY(sync_acquired, &m); |
| } |
| |
| void spin_mutex::scoped_lock::internal_release() { |
| __TBB_ASSERT( my_mutex, "release on spin_mutex::scoped_lock that is not holding a lock" ); |
| __TBB_ASSERT( !(my_unlock_value&1), "corrupted scoped_lock?" ); |
| |
| ITT_NOTIFY(sync_releasing, my_mutex); |
| __TBB_store_with_release(my_mutex->flag, static_cast<unsigned char>(my_unlock_value)); |
| my_mutex = NULL; |
| } |
| |
| bool spin_mutex::scoped_lock::internal_try_acquire( spin_mutex& m ) { |
| __TBB_ASSERT( !my_mutex, "already holding a lock on a spin_mutex" ); |
| bool result = bool( __TBB_TryLockByte(m.flag) ); |
| if( result ) { |
| my_unlock_value = 0; |
| my_mutex = &m; |
| ITT_NOTIFY(sync_acquired, &m); |
| } |
| return result; |
| } |
| |
| void spin_mutex::internal_construct() { |
| ITT_SYNC_CREATE(this, _T("tbb::spin_mutex"), _T("")); |
| } |
| |
| } // namespace tbb |