On Sat, 8 Jul 2006, Chase Venters wrote:
Perhaps you should have followed this thread closely before composing your
assault on Linus. We're not talking about "asm volatile". We're talking
about
the "volatile" keyword as applied to variables. 'volatile' as applied to
inline ASM is of course necessary in many cases -- no one is disputing
that.
Ok, let's port a spinlock macro that spins instead of context switches
instead of using the pthread garbage on IA64 or AMD64:
#if ((defined (_M_IA64) || defined (_M_AMD64)) && !defined(NT_INTEREX))
#include <windows.h>
#pragma intrinsic (_InterlockedExchange)
typedef volatile LONG lock_t[1];
#define LockInit(v) ((v)[0] = 0)
#define LockFree(v) ((v)[0] = 0)
#define Unlock(v) ((v)[0] = 0)
__forceinline void Lock(volatile LONG *hPtr)
{
int iValue;
for (;;) {
iValue = _InterlockedExchange((LPLONG)hPtr, 1);
if (iValue == 0)
return;
while (*hPtr);
}
}
Please show me how I can write this to spinlock without using volatile.
Trajce Nedev
[email protected]
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