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InterlockedBitTestAndSet64 function

Tests the specified bit of the specified LONG64 value and sets it to 1. The operation is atomic.

Syntax

C++


BOOLEAN WINAPI InterlockedBitTestAndSet64(
  _In_ LONG64 volatile *Base,
  _In_ LONG64          Bit
);

Parameters

Base [in]: A pointer to a variable.
Bit [in]: The bit position to be tested.

Return value

The value of the specified bit before it is set.

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 _interlockedbittestandset64.

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

Requirements

Header	Winnt.h (include Windows.h)