table of contents
| __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¶
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.
COPYRIGHT¶
| June 2024 | Kernel Hackers Manual 3.10 |