2 Copyright 2005-2010 Intel Corporation. All Rights Reserved.
4 This file is part of Threading Building Blocks.
6 Threading Building Blocks is free software; you can redistribute it
7 and/or modify it under the terms of the GNU General Public License
8 version 2 as published by the Free Software Foundation.
10 Threading Building Blocks is distributed in the hope that it will be
11 useful, but WITHOUT ANY WARRANTY; without even the implied warranty
12 of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with Threading Building Blocks; if not, write to the Free Software
17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19 As a special exception, you may use this file as part of a free software
20 library without restriction. Specifically, if other files instantiate
21 templates or use macros or inline functions from this file, or you compile
22 this file and link it with other files to produce an executable, this
23 file does not by itself cause the resulting executable to be covered by
24 the GNU General Public License. This exception does not however
25 invalidate any other reasons why the executable file might be covered by
26 the GNU General Public License.
29 #ifndef __TBB_task_group_H
30 #define __TBB_task_group_H
33 #include "tbb_exception.h"
38 template<typename F> class task_handle_task;
42 class task_handle : internal::no_assign {
43 template<typename _F> friend class internal::task_handle_task;
45 static const intptr_t scheduled = 0x1;
50 void mark_scheduled () {
51 // The check here is intentionally lax to avoid the impact of interlocked operation
52 if ( my_state & scheduled )
53 internal::throw_exception( internal::eid_invalid_multiple_scheduling );
54 my_state |= scheduled;
57 task_handle( const F& f ) : my_func(f), my_state(0) {}
59 void operator() () const { my_func(); }
62 enum task_group_status {
70 // Suppress gratuitous warnings from icc 11.0 when lambda expressions are used in instances of function_task.
71 //#pragma warning(disable: 588)
74 class function_task : public task {
76 /*override*/ task* execute() {
81 function_task( const F& f ) : my_func(f) {}
85 class task_handle_task : public task {
86 task_handle<F>& my_handle;
87 /*override*/ task* execute() {
92 task_handle_task( task_handle<F>& h ) : my_handle(h) { h.mark_scheduled(); }
95 class task_group_base : internal::no_copy {
98 task_group_context my_context;
100 task& owner () { return *my_root; }
103 task_group_status internal_run_and_wait( F& f ) {
105 if ( !my_context.is_group_execution_cancelled() )
107 } __TBB_CATCH( ... ) {
108 my_context.register_pending_exception();
113 template<typename F, typename Task>
114 void internal_run( F& f ) {
115 owner().spawn( *new( owner().allocate_additional_child_of(*my_root) ) Task(f) );
119 task_group_base( uintptr_t traits = 0 )
120 : my_context(task_group_context::bound, task_group_context::default_traits | traits)
122 my_root = new( task::allocate_root(my_context) ) empty_task;
123 my_root->set_ref_count(1);
127 void run( task_handle<F>& h ) {
128 internal_run< task_handle<F>, internal::task_handle_task<F> >( h );
131 task_group_status wait() {
133 my_root->wait_for_all();
134 } __TBB_CATCH( ... ) {
138 if ( my_context.is_group_execution_cancelled() ) {
145 bool is_canceling() {
146 return my_context.is_group_execution_cancelled();
150 my_context.cancel_group_execution();
152 }; // class task_group_base
154 } // namespace internal
156 class task_group : public internal::task_group_base {
158 task_group () : task_group_base( task_group_context::concurrent_wait ) {}
160 ~task_group() __TBB_TRY {
161 __TBB_ASSERT( my_root->ref_count() != 0, NULL );
162 if( my_root->ref_count() > 1 )
163 my_root->wait_for_all();
164 owner().destroy(*my_root);
166 #if TBB_USE_EXCEPTIONS
168 owner().destroy(*my_root);
171 #endif /* TBB_USE_EXCEPTIONS */
175 void run( task_handle<F>& h ) {
176 internal_run< task_handle<F>, internal::task_handle_task<F> >( h );
179 using task_group_base::run;
183 void run( const F& f ) {
184 internal_run< const F, internal::function_task<F> >( f );
188 task_group_status run_and_wait( const F& f ) {
189 return internal_run_and_wait<const F>( f );
193 task_group_status run_and_wait( task_handle<F>& h ) {
194 return internal_run_and_wait< task_handle<F> >( h );
196 }; // class task_group
198 class structured_task_group : public internal::task_group_base {
200 ~structured_task_group() {
201 if( my_root->ref_count() > 1 ) {
202 bool stack_unwinding_in_progress = std::uncaught_exception();
203 // Always attempt to do proper cleanup to avoid inevitable memory corruption
204 // in case of missing wait (for the sake of better testability & debuggability)
205 if ( !is_canceling() )
207 my_root->wait_for_all();
208 owner().destroy(*my_root);
209 if ( !stack_unwinding_in_progress )
210 internal::throw_exception( internal::eid_missing_wait );
213 if( my_root->ref_count() == 1 )
214 my_root->set_ref_count(0);
215 owner().destroy(*my_root);
220 task_group_status run_and_wait ( task_handle<F>& h ) {
221 return internal_run_and_wait< task_handle<F> >( h );
224 task_group_status wait() {
225 task_group_status res = task_group_base::wait();
226 my_root->set_ref_count(1);
229 }; // class structured_task_group
232 bool is_current_task_group_canceling() {
233 return task::self().is_cancelled();
237 task_handle<F> make_task( const F& f ) {
238 return task_handle<F>( f );
243 #endif /* __TBB_task_group_H */