The Linux Kernel API
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__test_and_set_bit

Name

__test_and_set_bit -- Set a bit and return its old value

Synopsis

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

Arguments

nr: Bit to set
addr: Address to count from

Description

This operation is non-atomic and can be reordered. If two examples of this operation race, one can appear to succeed but actually fail. You must protect multiple accesses with a lock.

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