TEST_AND_CHANGE_BIT(9)              Basic C Library Functions              TEST_AND_CHANGE_BIT(9)



NAME
       test_and_change_bit - Change a bit and return its old value

SYNOPSIS
       bool test_and_change_bit(long nr, volatile unsigned long * addr);

ARGUMENTS
       nr
           Bit to change

       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_CHANGE_BIT(9)