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/* spinlock.h: Header file for cygwin time-sensitive synchronization primitive.
Copyright 2010 Red Hat, Inc.
This file is part of Cygwin.
This software is a copyrighted work licensed under the terms of the
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
details. */
#ifndef _SPINLOCK_H
#define _SPINLOCK_H
#include "hires.h"
class spinlock
{
LONG *locker;
LONG val;
public:
spinlock (LONG& locktest, LONGLONG timeout):
locker (&locktest)
{
if ((val = locktest) == 1)
return;
LONGLONG then = gtod.msecs ();
for (;;)
{
if ((val = InterlockedExchange (locker, -1)) != -1
|| (gtod.msecs () - then) >= timeout)
break;
yield ();
}
}
~spinlock () {InterlockedExchange (locker, 1);}
operator LONG () const {return val;}
};
#endif /*_SPINLOCK_H*/
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