atomic_btr

Atomically clears the bit in the specified memory location.

Library:LibC

Classification:Other

Service:General C Services

Syntax

  #include <stdlib.h> 
   
  unsigned long   atomic_btr (
     unsigned long   *addr,
     unsigned long    offset);

Parameters

addr: (IN) Points to the memory location for the operation.
offset: (IN) Specifies the bit position, from 0 (the least significant bit) to 31 (the most significant bit).

Return Values

Returns the original value of the bit, either 0 or 1.

Remarks

The atomic_btr function sets the bit value to 0.

The memory location address is expected to be valid. If an invalid address is passed, the server will abend.

See Also