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/******************************************************************************
* Copyright (c) 2013-2014, Texas Instruments Incorporated - http://www.ti.com/
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of Texas Instruments Incorporated nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*****************************************************************************/
#include "u_lockable.h"
#ifndef _CORE_SCHEDULER_H
#define _CORE_SCHEDULER_H
class CoreScheduler : public Lockable
{
public:
CoreScheduler() : p_avail(0xff) {}
void free(int core)
{
Lock lock(this);
p_avail |= (1 << core);
CV.notify_one();
}
int allocate()
{
Lock lock(this);
/*---------------------------------------------------------------------
* Wait in a loop in case the condvar is falsely signalled
*--------------------------------------------------------------------*/
while (!p_avail) CV.wait(lock.raw());
for (int i=0, mask = 1; i < 8; ++i, mask <<= 1)
if (p_avail & mask) { p_avail &= ~mask; return i; }
}
private:
unsigned char p_avail;
CondVar CV;
};
#endif //_CORE_SCHEDULER_H
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