clear_bit

Section: Kernel Hacker's Manual (9)
Updated: clear_bit
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NAME

clear_bit - Clears a bit in memory

SYNOPSIS

void clear_bit (int nr, volatile void *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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Time: 03:54:33 GMT, June 12, 2005