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

6       __test_and_set_bit - Set a bit and return its old value
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SYNOPSIS

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

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

19       This operation is non-atomic and can be reordered. If two examples of
20       this operation race, one can appear to succeed but actually fail. You
21       must protect multiple accesses with a lock.
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24Kernel Hackers Manual 3.10         June 2019             __TEST_AND_SET_BIT(9)
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