41 lines
821 B
C
41 lines
821 B
C
|
/* 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*/
|
||
|
|
|