xnu-792.22.5.tar.gz

[apple/xnu.git] / osfmk / i386 / locks.h

diff --git a/osfmk/i386/locks.h b/osfmk/i386/locks.h
index 40e3340e341908c42c70449a8c4b822c497139a7..3129d79bd0942f67334e7110fe0563baa81f6b6f 100644 (file)
--- a/osfmk/i386/locks.h
+++ b/osfmk/i386/locks.h
@@ -1,23 +1,29 @@
 /*
  * Copyright (c) 2004 Apple Computer, Inc. All rights reserved.
  *
- * @APPLE_LICENSE_HEADER_START@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
  * 
- * The contents of this file constitute Original Code as defined in and
- * are subject to the Apple Public Source License Version 1.1 (the
- * "License").  You may not use this file except in compliance with the
- * License.  Please obtain a copy of the License at
- * http://www.apple.com/publicsource and read it before using this file.
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
  * 
- * This Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
+ * 
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
- * License for the specific language governing rights and limitations
- * under the License.
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
  * 
- * @APPLE_LICENSE_HEADER_END@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  */
 
 #ifndef        _I386_LOCKS_H_
@@ -82,6 +88,12 @@ typedef struct _lck_mtx_ {
 #define        LCK_MTX_TAG_INDIRECT                    0x00001007      /* lock marked as Indirect  */
 #define        LCK_MTX_TAG_DESTROYED                   0x00002007      /* lock marked as Destroyed */
 
+/* Adaptive spin before blocking */
+extern unsigned int    MutexSpin;
+extern void            lck_mtx_lock_spin(lck_mtx_t *lck);
+
+extern void            lck_mtx_interlock_spin(lck_mtx_t *lck);
+
 typedef struct {
        unsigned int            type;
        vm_offset_t             pc;
@@ -103,9 +115,9 @@ typedef struct _lck_mtx_ext_ {
 } lck_mtx_ext_t;
 
 #define        LCK_MTX_ATTR_DEBUG      0x1
-#define        LCK_MTX_ATTR_DEBUGb     31
+#define        LCK_MTX_ATTR_DEBUGb     0
 #define        LCK_MTX_ATTR_STAT       0x2
-#define        LCK_MTX_ATTR_STATb      30
+#define        LCK_MTX_ATTR_STATb      1
 
 #else
 #ifdef KERNEL_PRIVATE
@@ -123,12 +135,24 @@ typedef struct {
        volatile unsigned int
                                                read_count:16,  /* No. of accepted readers */
                                                want_upgrade:1, /* Read-to-write upgrade waiting */
-                                               want_write:1,   /* Writer is waiting, or locked for write */
+                       want_write:1,   /* Writer waiting or locked for write */
                                                waiting:1,              /* Someone is sleeping on lock */
-                                               can_sleep:1;    /* Can attempts to lock go to sleep? */
+                       can_sleep:1,    /* Can attempts to lock go to sleep? */
+                       read_priority:1;/* New read takes piority over write */
        unsigned int            lck_rw_tag;
 } lck_rw_t;
 
+#define        LCK_RW_ATTR_DEBUG       0x1
+#define        LCK_RW_ATTR_DEBUGb      0
+#define        LCK_RW_ATTR_STAT        0x2
+#define        LCK_RW_ATTR_STATb       1
+#define LCK_RW_ATTR_READ_PRI   0x3
+#define LCK_RW_ATTR_READ_PRIb  2
+#define        LCK_RW_ATTR_DIS_THREAD  0x40000000
+#define        LCK_RW_ATTR_DIS_THREADb 30
+#define        LCK_RW_ATTR_DIS_MYLOCK  0x10000000
+#define        LCK_RW_ATTR_DIS_MYLOCKb 28
+
 #define        LCK_RW_TAG_DESTROYED            0x00002007      /* lock marked as Destroyed */
 
 #else