4coder-non-source/test_data/lots_of_files/atomic.c

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2023-09-30 01:17:40 +00:00
/* atomic.c -- implement shared_ptr spin lock */
#include <yvals.h>
#include <intrin.h>
#pragma warning(disable: 4793)
_STD_BEGIN
/* SPIN LOCK FOR shared_ptr ATOMIC OPERATIONS */
volatile long _Shared_ptr_flag;
_CRTIMP2_PURE void __cdecl _Lock_shared_ptr_spin_lock()
{ /* spin until _Shared_ptr_flag successfully set */
#ifdef _M_ARM
while (_InterlockedExchange_acq(&_Shared_ptr_flag, 1))
__yield();
#else /* _M_ARM */
while (_interlockedbittestandset(&_Shared_ptr_flag, 0)) /* set bit 0 */
;
#endif /* _M_ARM */
}
_CRTIMP2_PURE void __cdecl _Unlock_shared_ptr_spin_lock()
{ /* release previously obtained lock */
#ifdef _M_ARM
__dmb(_ARM_BARRIER_ISH);
__iso_volatile_store32((volatile int *) &_Shared_ptr_flag, 0);
#else /* _M_ARM */
_interlockedbittestandreset(&_Shared_ptr_flag, 0); /* reset bit 0 */
#endif /* _M_ARM */
}
_STD_END
/*
* Copyright (c) 1992-2012 by P.J. Plauger. ALL RIGHTS RESERVED.
* Consult your license regarding permissions and restrictions.
V6.00:0009 */