1TEST_AND_CHANGE_BIT(9)     Basic C Library Functions    TEST_AND_CHANGE_BIT(9)
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NAME

6       test_and_change_bit - Change a bit and return its old value
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SYNOPSIS

9       int test_and_change_bit(int nr, volatile unsigned long * addr);
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ARGUMENTS

12       nr
13           Bit to change
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15       addr
16           Address to count from
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DESCRIPTION

19       This operation is atomic and cannot be reordered. It also implies a
20       memory barrier.
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23Kernel Hackers Manual 2.6.         June 2019            TEST_AND_CHANGE_BIT(9)
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