_InterlockedXor, _InterlockedXor64

Microsoft Specific

Used to perform an atomic operation (in this case, the exclusive or XOR operation) on a variable shared by multiple threads.

long _InterlockedXor(
 long volatile * Value,
 long Mask
);
long _InterlockedXor_acq(
 long volatile * Value,
 long Mask
);
long _InterlockedXor_rel(
 long volatile * Value,
 long Mask
);
char _InterlockedXor8(
 char volatile * Value,
 char Mask
);
char _InterlockedXor8_acq(
 char volatile * Value,
 char Mask
);
char _InterlockedXor8_rel(
 char volatile * Value,
 char Mask
);
short _InterlockedXor16(
 short volatile * Value,
 short Mask
);
short _InterlockedXor16_acq(
 short volatile * Value,
 short Mask
);
short _InterlockedXor16_rel(
 short volatile * Value,
 short Mask
);
__int64 _InterlockedXor64(
 __int64 volatile * Value,
 __int64 Mask
);
__int64 _InterlockedXor64_acq(
 __int64 volatile * Value,
 __int64 Mask
);
__int64 _InterlockedXor64_rel(
 __int64 volatile * Value,
 __int64 Mask
);

Parameters

• [in, out] Value
  A pointer to the first operand, to be replaced by the result.

• [in] Mask
  The second operand.

Return Value

The original value of the first operand.

Requirements

Header file <intrin.h>

Remarks

The number in the name of each function specifies the bit size of the arguments.

These functions behave as read-write memory barriers. For more information, see _ReadWriteBarrier.

The IPF-specific _InterlockedXor_acq, _InterlockedXor8_acq, _InterlockedXor16_acq, and _InterlockedXor64_acq intrinsic functions are the same as the corresponding functions without the acq suffix except that the operation is performed with acquire semantics, which is useful when entering a critical section.

The _InterlockedXor_rel, _InterlockedXor8_rel, _InterlockedXor16_rel, and _InterlockedXor64_rel intrinsic functions are the same as the corresponding functions without the rel suffix except that the operation is performed with release semantics, which is useful when leaving a critical section.

Example

// _InterLockedXor.cpp
#include <stdio.h>
#include <intrin.h>
#pragma intrinsic(_InterlockedXor)
int main()
{
 long data1 = 0xFF00FF00;
 long data2 = 0x00FFFF00;
 long retval;
 retval = _InterlockedXor(&data1, data2);
 printf_s("0x%x 0x%x 0x%x", data1, data2, retval); 
}

0xffff0000 0xffff00 0xff00ff00

See Also

Reference

Compiler Intrinsics

Conflicts with the x86 Compiler