Differential D47450 Diff 146068 sys/sys/_mutex.h

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sys/sys/_mutex.h

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	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY			* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF			* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	* SUCH DAMAGE.			* SUCH DAMAGE.
	*/			*/

	#ifndef _SYS__MUTEX_H_			#ifndef _SYS__MUTEX_H_
	#define _SYS__MUTEX_H_			#define _SYS__MUTEX_H_

				#include <sys/_types.h>
				#include <sys/_lock.h>
	#include <machine/param.h>			#include <machine/param.h>

	/*			/*
	* Sleep/spin mutex.			* Sleep/spin mutex.
	*			*
	* All mutex implementations must always have a member called mtx_lock.			* All mutex implementations must always have a member called mtx_lock.
	* Other locking primitive structures are not allowed to use this name			* Other locking primitive structures are not allowed to use this name
	* for their members.			* for their members.
	* If this rule needs to change, the bits in the mutex implementation must			* If this rule needs to change, the bits in the mutex implementation must
	* be modified appropriately.			* be modified appropriately.
	*/			*/
	struct mtx {			struct mtx {
	struct lock_object lock_object; /* Common lock properties. */			struct lock_object lock_object; /* Common lock properties. */
	volatile uintptr_t mtx_lock; /* Owner and flags. */			volatile __uintptr_t mtx_lock; /* Owner and flags. */
	};			};

	/*			/*
	* Members of struct mtx_padalign must mirror members of struct mtx.			* Members of struct mtx_padalign must mirror members of struct mtx.
	* mtx_padalign mutexes can use the mtx(9) API transparently without			* mtx_padalign mutexes can use the mtx(9) API transparently without
	* modification.			* modification.
	* Pad-aligned mutexes used within structures should generally be the			* Pad-aligned mutexes used within structures should generally be the
	* first member of the struct. Otherwise, the compiler can generate			* first member of the struct. Otherwise, the compiler can generate
	* additional padding for the struct to keep a correct alignment for			* additional padding for the struct to keep a correct alignment for
	* the mutex.			* the mutex.
	*/			*/
	struct mtx_padalign {			struct mtx_padalign {
	struct lock_object lock_object; /* Common lock properties. */			struct lock_object lock_object; /* Common lock properties. */
	volatile uintptr_t mtx_lock; /* Owner and flags. */			volatile __uintptr_t mtx_lock; /* Owner and flags. */
	} __aligned(CACHE_LINE_SIZE);			} __aligned(CACHE_LINE_SIZE);

	#endif /* !_SYS__MUTEX_H_ */			#endif /* !_SYS__MUTEX_H_ */