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__TEST_AND_CLEAR_BIT(9) Basic C Library Functions __TEST_AND_CLEAR_BIT(9)

NAME

__test_and_clear_bit - Clear a bit and return its old value

SYNOPSIS

int __test_and_clear_bit(int nr, volatile unsigned long * addr);

ARGUMENTS

nr
Bit to clear
addr
Address to count from

DESCRIPTION

This operation is non-atomic and can be reordered. If two examples of this operation race, one can appear to succeed but actually fail. You must protect multiple accesses with a lock.

COPYRIGHT

March 2016 Kernel Hackers Manual 3.2.