Scroll to navigation

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

long nr
Bit to set

volatile unsigned long * addr

Address to count from

DESCRIPTION

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

COPYRIGHT

July 2017 Kernel Hackers Manual 4.11