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73 lines
2.8 KiB
73 lines
2.8 KiB
/*
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Copyright 2005-2013 Intel Corporation. All Rights Reserved.
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This file is part of Threading Building Blocks.
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Threading Building Blocks is free software; you can redistribute it
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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.
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Threading Building Blocks is distributed in the hope that it will be
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useful, but WITHOUT ANY WARRANTY; without even the implied warranty
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of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Threading Building Blocks; if not, write to the Free Software
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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
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library without restriction. Specifically, if other files instantiate
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templates or use macros or inline functions from this file, or you compile
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this file and link it with other files to produce an executable, this
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file does not by itself cause the resulting executable to be covered by
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the GNU General Public License. This exception does not however
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invalidate any other reasons why the executable file might be covered by
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the GNU General Public License.
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*/
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// Test that __TBB_Yield works.
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// On Red Hat EL4 U1, it does not work, because sched_yield is broken.
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#include "tbb/tbb_machine.h"
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#include "tbb/tick_count.h"
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#include "harness.h"
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static volatile long CyclicCounter;
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static volatile bool Quit;
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double SingleThreadTime;
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struct RoundRobin: NoAssign {
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const int number_of_threads;
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RoundRobin( long p ) : number_of_threads(p) {}
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void operator()( long k ) const {
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tbb::tick_count t0 = tbb::tick_count::now();
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for( long i=0; i<10000; ++i ) {
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// Wait for previous thread to notify us
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for( int j=0; CyclicCounter!=k && !Quit; ++j ) {
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__TBB_Yield();
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if( j%100==0 ) {
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tbb::tick_count t1 = tbb::tick_count::now();
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if( (t1-t0).seconds()>=1.0*number_of_threads ) {
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REPORT("Warning: __TBB_Yield failing to yield with %d threads (or system is heavily loaded)\n",number_of_threads);
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Quit = true;
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return;
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}
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}
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}
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// Notify next thread that it can run
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CyclicCounter = (k+1)%number_of_threads;
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}
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}
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};
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int TestMain () {
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for( int p=MinThread; p<=MaxThread; ++p ) {
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REMARK("testing with %d threads\n", p );
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CyclicCounter = 0;
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Quit = false;
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NativeParallelFor( long(p), RoundRobin(p) );
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}
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return Harness::Done;
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}
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