set_bit — Atomically set a bit in memory


void set_bit (long nr,
 volatile unsigned long * addr);


long nr

the bit to set

volatile unsigned long * addr

the address to start counting from


This function is atomic and may not be reordered. See __set_bit if you do not require the atomic guarantees.


there are no guarantees that this function will not be reordered on non x86 architectures, so if you are writing portable code, make sure not to rely on its reordering guarantees.

Note that nr may be almost arbitrarily large; this function is not restricted to acting on a single-word quantity.