xnu-1228.12.14.tar.gz

[apple/xnu.git] / osfmk / mach / thread_policy.h

diff --git a/osfmk/mach/thread_policy.h b/osfmk/mach/thread_policy.h
index 3deeeccd3700905c2ce6bcd176deae47908ca272..d9530b776ca3c7e42d5a47a879056bec466cc355 100644 (file)
--- a/osfmk/mach/thread_policy.h
+++ b/osfmk/mach/thread_policy.h
@@ -1,14 +1,19 @@
 /*
- * Copyright (c) 2000-2005 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2007 Apple Inc. All rights reserved.
  *
- * @APPLE_LICENSE_HEADER_START@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
  * 
  * 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. Please obtain a copy of the License at
- * http://www.opensource.apple.com/apsl/ and read it before using this
- * file.
+ * 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.
+ * 
+ * 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
@@ -18,7 +23,7 @@
  * 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 _MACH_THREAD_POLICY_H_
@@ -178,4 +183,36 @@ typedef struct thread_precedence_policy            *thread_precedence_policy_t;
 #define THREAD_PRECEDENCE_POLICY_COUNT ((mach_msg_type_number_t) \
        (sizeof (thread_precedence_policy_data_t) / sizeof (integer_t)))
 
+/*
+ * THREAD_AFFINITY_POLICY:
+ *
+ * This policy is experimental.
+ * This may be used to express affinity relationships 
+ * between threads in the task. Threads with the same affinity tag will
+ * be scheduled to share an L2 cache if possible. That is, affinity tags
+ * are a hint to the scheduler for thread placement. 
+ *
+ * The namespace of affinity tags is generally local to one task. However,
+ * a child task created after the assignment of affinity tags by its parent
+ * will share that namespace. In particular, a family of forked processes
+ * may be created with a shared affinity namespace.
+ *
+ * Parameters:
+ * tag: The affinity set identifier.
+ */
+
+#define THREAD_AFFINITY_POLICY         4
+
+struct thread_affinity_policy {
+       integer_t       affinity_tag;
+};
+
+#define THREAD_AFFINITY_TAG_NULL               0
+
+typedef struct thread_affinity_policy          thread_affinity_policy_data_t;
+typedef struct thread_affinity_policy          *thread_affinity_policy_t;
+
+#define THREAD_AFFINITY_POLICY_COUNT   ((mach_msg_type_number_t) \
+       (sizeof (thread_affinity_policy_data_t) / sizeof (integer_t)))
+
 #endif /* _MACH_THREAD_POLICY_H_ */