Atomic bit operations

• Supply very fast, atomic operations

• On most platforms, apply to an unsigned long type. Apply to a void type on a few others.

• Set, clear, toggle a given bit: void set_bit(int nr, unsigned long * addr); void clear_bit(int nr, unsigned long * addr); void change_bit(int nr, unsigned long * addr);

• Test bit value: int test_bit(int nr, unsigned long *addr);

• Test and modify (return the previous value): int test_and_set_bit (...); int test_and_clear_bit (...); int test_and_change_bit (...);