InterlockedExchange8 function

Sets an 8-bit variable to the specified value as an atomic operation.

To operate on a pointer variable, use the InterlockedExchangePointer function.

To operate on a 16-bit variable, use the InterlockedExchange16 function.

To operate on a 32-bit variable, use the InterlockedExchange function.

To operate on a 64-bit variable, use the InterlockedExchange64 function.

Syntax

CHAR InterlockedExchange8(
  CHAR volatile *Target,
  CHAR          Value
);

Parameters

Target

A pointer to the value to be exchanged. The function sets this variable to Value, and returns its prior value.

Value

The value to be exchanged with the value pointed to by Target.

Return Value

The function returns the initial value of the Target parameter.

Remarks

The interlocked functions provide a simple mechanism for synchronizing access to a variable that is shared by multiple threads. This function is atomic with respect to calls to other interlocked functions.

This function is implemented using a compiler intrinsic where possible. For more information, see the WinBase.h header file and _InterlockedExchange8.

This function generates a full memory barrier (or fence) to ensure that memory operations are completed in order.

Note  This function is supported on Windows RT-based systems.
 

Requirements

   
Minimum supported client Windows 8 [desktop apps only]
Minimum supported server Windows Server 2012 [desktop apps only]
Target Platform Windows
Header winnt.h (include Windows.h)

See Also

Interlocked Variable Access

InterlockedCompareExchange

InterlockedExchange

InterlockedExchange16

InterlockedExchange16Acquire

InterlockedExchange16NoFence

InterlockedExchange64

InterlockedExchangeAcquire

InterlockedExchangeAcquire64

InterlockedExchangeAdd

InterlockedExchangeNoFence

InterlockedExchangeNoFence64

InterlockedExchangePointer

InterlockedExchangePointerAcquire

InterlockedExchangePointerNoFence

InterlockedExchangeSubtract

Synchronization Functions