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TEST_AND_SET_BIT(9) Basic C Library Functions TEST_AND_SET_BIT(9)

NAME

test_and_set_bit - Set a bit and return its old value

SYNOPSIS

bool test_and_set_bit(long nr, volatile unsigned long * addr);

ARGUMENTS

nr
Bit to set

addr

Address to count from

DESCRIPTION

This operation is atomic and cannot be reordered. It also implies a memory barrier.

COPYRIGHT

April 2019 Kernel Hackers Manual 4.9.