_InterlockedOr, _InterlockedOr64
Microsoft Specific
Perform an atomic operation (in this case, the OR operation) on a variable shared by multiple threads.
long _InterlockedOr(
long volatile * Value,
long Mask
);
long _InterlockedOr_acq(
long volatile * Value,
long Mask
);
long _InterlockedOr_rel(
long volatile * Value,
long Mask
);
char _InterlockedOr8(
char volatile * Value,
long Mask
);
char _InterlockedOr8_acq(
char volatile * Value,
char Mask
);
char _InterlockedOr8_rel(
char volatile * Value,
char Mask
);
short _InterlockedOr16(
short volatile * Value,
short Mask
);
short _InterlockedOr16_acq(
short volatile * Value,
short Mask
);
short _InterlockedOr16_rel(
short volatile * Value,
short Mask
);
__int64 _InterlockedOr64(
__int64 volatile * Value,
__int64 Mask
);
__int64 _InterlockedOr64_acq(
__int64 volatile * Value,
__int64 Mask
);
__int64 _InterlockedOr64_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 pointed to by the first parameter.
Requirements
| Intrinsic | Architecture |
|---|---|
_InterlockedOr |
x86, IPF, x64 |
_InterlockedOr_acq |
IPF |
_InterlockedOr_rel |
IPF |
_InterlockedOr8 |
x86, IPF, x64 |
_InterlockedOr8_acq |
IPF |
_InterlockedOr8_rel |
IPF |
_InterlockedOr16 |
x86, IPF, x64 |
_InterlockedOr16_acq |
IPF |
_InterlockedOr16_rel |
IPF |
_InterlockedOr64 |
IPF, x64 |
_InterlockedOr64_acq |
IPF |
_InterlockedOr64_rel |
IPF |
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 _InterlockedOr_acq, _InterlockedOr8_acq, _InterlockedOr16_acq, and _InterlockedOr64_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 _InterlockedOr_rel, _InterlockedOr8_rel, _InterlockedOr16_rel, and _InterlockedOr64_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
// _InterlockedOr.cpp
#include <stdio.h>
#include <intrin.h>
#pragma intrinsic(_InterlockedOr)
int main()
{
long data1 = 0xFF00FF00;
long data2 = 0x00FFFF00;
long retval;
retval = _InterlockedOr(&data1, data2);
printf_s("0x%x 0x%x 0x%x", data1, data2, retval);
}
Output
0xffffff00 0xffff00 0xff00ff00