CLEAR_BIT

Section: Basic C Library Functions (9)
Updated: February 2011
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NAME

clear_bit - Clears a bit in memory  

SYNOPSIS

void clear_bit(int nr, volatile unsigned long * addr);
 

ARGUMENTS

nr

Bit to clear

addr

Address to start counting from
 

DESCRIPTION

clear_bit is atomic and may not be reordered. However, it does not contain a memory barrier, so if it is used for locking purposes, you should call smp_mb__before_clear_bit and/or smp_mb__after_clear_bit in order to ensure changes are visible on other processors.  

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