ATOMIC_BITS(9F) Kernel Functions for Drivers ATOMIC_BITS(9F)
NAME
atomic_bits, atomic_set_long_excl, atomic_clear_long_excl - atomic
set and clear bit operations
SYNOPSIS
#include <sys/atomic.h>
int atomic_set_long_excl(
volatile ulong_t *target,
uint_t bit);
int atomic_clear_long_excl(
volatile ulong_t *target,
uint_t bit);
DESCRIPTION
The
atomic_set_long_excl() and
atomic_clear_long_excl() functions
perform an exclusive atomic bit set or clear operation on
target. The
value of
bit specifies the number of the bit to be modified within
target. Bits are numbered from zero to one less than the maximum
number of bits in a
long. If the value of bit falls outside of this
range, the result of the operation is undefined.
RETURN VALUES
The
atomic_set_long_excl() and
atomic_clear_long_excl() functions
return 0 if
bit was successfully set or cleared. They return -1 if
bit was already set or cleared.
ERRORS
No errors are defined.
CONTEXT
These functions can be called from user, interrupt, or kernel
context.
ATTRIBUTES
See
attributes(7) for descriptions of the following attributes:
+--------------------+-----------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+-----------------+
|Interface Stability | Committed |
+--------------------+-----------------+
SEE ALSO
atomic_ops(3C),
attributes(7),
atomic_add(9F),
atomic_and(9F),
atomic_cas(9F),
atomic_dec(9F),
atomic_inc(9F),
atomic_or(9F),
atomic_swap(9F),
membar_ops(9F) January 16, 2006 ATOMIC_BITS(9F)
