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59 lines
2.4 KiB
C++
59 lines
2.4 KiB
C++
/*
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Copyright 2005-2014 Intel Corporation. All Rights Reserved.
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This file is part of Threading Building Blocks. Threading Building Blocks is free software;
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you can redistribute it and/or modify it under the terms of the GNU General Public License
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version 2 as published by the Free Software Foundation. Threading Building Blocks is
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distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the
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implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License for more details. You should have received a copy of
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the GNU General Public License along with Threading Building Blocks; if not, write to the
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Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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As a special exception, you may use this file as part of a free software library without
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restriction. Specifically, if other files instantiate templates or use macros or inline
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functions from this file, or you compile this file and link it with other files to produce
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an executable, this file does not by itself cause the resulting executable to be covered
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by the GNU General Public License. This exception does not however invalidate any other
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reasons why the executable file might be covered by the GNU General Public License.
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*/
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#include "tbb/tbb_machine.h"
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#include "tbb/spin_mutex.h"
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#include "itt_notify.h"
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#include "tbb_misc.h"
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namespace tbb {
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void spin_mutex::scoped_lock::internal_acquire( spin_mutex& m ) {
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__TBB_ASSERT( !my_mutex, "already holding a lock on a spin_mutex" );
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ITT_NOTIFY(sync_prepare, &m);
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__TBB_LockByte(m.flag);
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my_mutex = &m;
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ITT_NOTIFY(sync_acquired, &m);
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}
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void spin_mutex::scoped_lock::internal_release() {
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__TBB_ASSERT( my_mutex, "release on spin_mutex::scoped_lock that is not holding a lock" );
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ITT_NOTIFY(sync_releasing, my_mutex);
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__TBB_UnlockByte(my_mutex->flag);
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my_mutex = NULL;
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}
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bool spin_mutex::scoped_lock::internal_try_acquire( spin_mutex& m ) {
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__TBB_ASSERT( !my_mutex, "already holding a lock on a spin_mutex" );
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bool result = bool( __TBB_TryLockByte(m.flag) );
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if( result ) {
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my_mutex = &m;
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ITT_NOTIFY(sync_acquired, &m);
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}
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return result;
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}
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void spin_mutex::internal_construct() {
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ITT_SYNC_CREATE(this, _T("tbb::spin_mutex"), _T(""));
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}
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} // namespace tbb
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