| /* |
| 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. |
| */ |
| |
| // Test that __TBB_Yield works. |
| // On Red Hat EL4 U1, it does not work, because sched_yield is broken. |
| |
| #include "tbb/tbb_machine.h" |
| #include "tbb/tick_count.h" |
| #include "harness.h" |
| |
| static volatile long CyclicCounter; |
| static volatile bool Quit; |
| double SingleThreadTime; |
| |
| struct RoundRobin: NoAssign { |
| const int number_of_threads; |
| RoundRobin( long p ) : number_of_threads(p) {} |
| void operator()( long k ) const { |
| tbb::tick_count t0 = tbb::tick_count::now(); |
| for( long i=0; i<10000; ++i ) { |
| // Wait for previous thread to notify us |
| for( int j=0; CyclicCounter!=k && !Quit; ++j ) { |
| __TBB_Yield(); |
| if( j%100==0 ) { |
| tbb::tick_count t1 = tbb::tick_count::now(); |
| if( (t1-t0).seconds()>=1.0*number_of_threads ) { |
| REPORT("Warning: __TBB_Yield failing to yield with %d threads (or system is heavily loaded)\n",number_of_threads); |
| Quit = true; |
| return; |
| } |
| } |
| } |
| // Notify next thread that it can run |
| CyclicCounter = (k+1)%number_of_threads; |
| } |
| } |
| }; |
| |
| int TestMain () { |
| for( int p=MinThread; p<=MaxThread; ++p ) { |
| REMARK("testing with %d threads\n", p ); |
| CyclicCounter = 0; |
| Quit = false; |
| NativeParallelFor( long(p), RoundRobin(p) ); |
| } |
| return Harness::Done; |
| } |
| |