_InterlockedAnd, _InterlockedAnd64 

Microsoft Specific

Used to perform an atomic AND operation on a variable shared by multiple threads.

long _InterlockedAnd(
 long volatile * value,
 long mask
);
long _InterlockedAnd_acq(
 long volatile * value,
 long mask
);
long _InterlockedAnd_rel(
 long volatile * value,
 long mask
);
char _InterlockedAnd8(
 char volatile * value,
 char mask
);
char _InterlockedAnd8_acq(
 char volatile * value,
 char mask
);
char _InterlockedAnd8_rel(
 char volatile * value,
 char mask
);
short _InterlockedAnd16(
 short volatile * value,
 short mask
);
short _InterlockedAnd16_acq(
 short volatile * value,
 short mask
);
short _InterlockedAnd16_rel(
 short volatile * value,
 short mask
);
__int64 _InterlockedAnd64(
 __int64 volatile* value,
 __int64 mask
);
__int64 _InterlockedAnd64_acq(
 __int64 volatile* value,
 __int64 mask
);
__int64 _InterlockedAnd64_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.

In Visual C++ 2005, these functions behave as read-write memory barriers. For more information, see _ReadWriteBarrier.

The IPF-specific _InterlockedAnd_acq, _InterlockedAnd8_acq, _InterlockedAnd16_acq, and _InterlockedAnd64_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 _InterlockedAnd_rel, _InterlockedAnd8_rel, _InterlockedAnd16_rel, and _InterlockedAnd64_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

// InterlockedAnd.cpp
// Compile with: /Oi
#include <stdio.h>
#include <intrin.h>

#pragma intrinsic(_InterlockedAnd)

int main()
{
 long data1 = 0xFF00FF00;
 long data2 = 0x00FFFF00;
 long retval;
 retval = _InterlockedAnd(&data1, data2);
 printf_s("0x%x 0x%x 0x%x", data1, data2, retval); 
}

Output

0xff00 0xffff00 0xff00ff00

END Microsoft Specific

See Also

Reference

Compiler Intrinsics