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
Kernel Hackers Manual 4.8.                 January 2017                       TEST_AND_SET_BIT(9)