'\" te
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.TH ATOMIC_BITS 9F "Jan 16, 2006"
.SH NAME
atomic_bits, atomic_set_long_excl, atomic_clear_long_excl \- atomic set and
clear bit operations
.SH SYNOPSIS
.LP
.nf
#include <sys/atomic.h>

\fBint\fR \fBatomic_set_long_excl\fR(\fBvolatile ulong_t *\fR\fItarget\fR, \fBuint_t\fR \fIbit\fR);
.fi

.LP
.nf
\fBint\fR \fBatomic_clear_long_excl\fR(\fBvolatile ulong_t *\fR\fItarget\fR, \fBuint_t\fR \fIbit\fR);
.fi

.SH DESCRIPTION
.sp
.LP
The \fBatomic_set_long_excl()\fR and \fBatomic_clear_long_excl()\fR functions
perform an exclusive atomic bit set or clear operation on \fItarget\fR. The
value of \fIbit\fR 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 \fBlong\fR. If the value of bit falls outside of this range, the result of
the operation is undefined.
.SH RETURN VALUES
.sp
.LP
The \fBatomic_set_long_excl()\fR and \fBatomic_clear_long_excl()\fR functions
return 0 if \fIbit\fR was successfully set or cleared. They return -1 if
\fIbit\fR was already set or cleared.
.SH ERRORS
.sp
.LP
No errors are defined.
.SH CONTEXT
.sp
.LP
These functions can be called from user, interrupt, or kernel context.
.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(7) for descriptions of the following attributes:
.sp

.sp
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
_
Interface Stability	Committed
.TE

.SH SEE ALSO
.sp
.LP
.BR atomic_ops (3C),
.BR attributes (7),
.BR atomic_add (9F),
.BR atomic_and (9F),
.BR atomic_cas (9F),
.BR atomic_dec (9F),
.BR atomic_inc (9F),
.BR atomic_or (9F),
.BR atomic_swap (9F),
.BR membar_ops (9F)