| /* |
| 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. |
| */ |
| |
| #ifndef __TBB_task_scheduler_observer_H |
| #define __TBB_task_scheduler_observer_H |
| |
| #include "atomic.h" |
| |
| #if __TBB_SCHEDULER_OBSERVER |
| |
| namespace tbb { |
| |
| namespace internal { |
| |
| class observer_proxy; |
| |
| class task_scheduler_observer_v3 { |
| friend class observer_proxy; |
| observer_proxy* my_proxy; |
| atomic<intptr_t> my_busy_count; |
| public: |
| //! Enable or disable observation |
| void __TBB_EXPORTED_METHOD observe( bool state=true ); |
| |
| //! True if observation is enables; false otherwise. |
| bool is_observing() const {return my_proxy!=NULL;} |
| |
| //! Construct observer with observation disabled. |
| task_scheduler_observer_v3() : my_proxy(NULL) {my_busy_count=0;} |
| |
| //! Called by thread before first steal since observation became enabled |
| virtual void on_scheduler_entry( bool /*is_worker*/ ) {} |
| |
| //! Called by thread when it no longer takes part in task stealing. |
| virtual void on_scheduler_exit( bool /*is_worker*/ ) {} |
| |
| //! Destructor |
| virtual ~task_scheduler_observer_v3() {observe(false);} |
| }; |
| |
| } // namespace internal |
| |
| typedef internal::task_scheduler_observer_v3 task_scheduler_observer; |
| |
| } // namespace tbb |
| |
| #endif /* __TBB_SCHEDULER_OBSERVER */ |
| |
| #endif /* __TBB_task_scheduler_observer_H */ |
