xnu-6153.41.3.tar.gz

[apple/xnu.git] / iokit / Kernel / IOSyncer.cpp

diff --git a/iokit/Kernel/IOSyncer.cpp b/iokit/Kernel/IOSyncer.cpp
index c7772a938cb15a4f29c31f880f4ed8e3781de7cb..b4df67d2fb81b69daf13cad838d30b5ebfacb7e5 100644 (file)
--- a/iokit/Kernel/IOSyncer.cpp
+++ b/iokit/Kernel/IOSyncer.cpp
@@ -1,17 +1,20 @@
 /*
  * Copyright (c) 1998-2000 Apple Computer, Inc. All rights reserved.
  *
- * @APPLE_LICENSE_HEADER_START@
- * 
- * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
- * 
+ * @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
  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
@@ -19,8 +22,8 @@
  * 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@
  */
 /* IOSyncer.cpp created by wgulland on 2000-02-02 */
 
@@ -31,88 +34,100 @@ OSDefineMetaClassAndStructors(IOSyncer, OSObject)
 
 IOSyncer * IOSyncer::create(bool twoRetains)
 {
-    IOSyncer * me = new IOSyncer;
+       IOSyncer * me = new IOSyncer;
 
-    if (me && !me->init(twoRetains)) {
-        me->release();
-        return 0;
-    }
+       if (me && !me->init(twoRetains)) {
+               me->release();
+               return NULL;
+       }
 
-    return me;
+       return me;
 }
 
-bool IOSyncer::init(bool twoRetains)
+bool
+IOSyncer::init(bool twoRetains)
 {
-    if (!OSObject::init())
-        return false;
+       if (!OSObject::init()) {
+               return false;
+       }
+
+       if (!(guardLock = IOSimpleLockAlloc())) {
+               return false;
+       }
 
-    if (!(guardLock = IOSimpleLockAlloc()) )
-        return false;
-       
-    IOSimpleLockInit(guardLock);
+       IOSimpleLockInit(guardLock);
 
-    if(twoRetains)
-       retain();
+       if (twoRetains) {
+               retain();
+       }
 
-    fResult = kIOReturnSuccess;
+       fResult = kIOReturnSuccess;
 
-    reinit();
+       reinit();
 
-    return true;
+       return true;
 }
 
-void IOSyncer::reinit()
+void
+IOSyncer::reinit()
 {
-    IOInterruptState is = IOSimpleLockLockDisableInterrupt(guardLock);
-    threadMustStop = true;
-    IOSimpleLockUnlockEnableInterrupt(guardLock, is);
+       IOInterruptState is = IOSimpleLockLockDisableInterrupt(guardLock);
+       threadMustStop = true;
+       IOSimpleLockUnlockEnableInterrupt(guardLock, is);
 }
 
-void IOSyncer::free()
+void
+IOSyncer::free()
 {
-    // just in case a thread is blocked here:
-    privateSignal();
+       // just in case a thread is blocked here:
+       privateSignal();
 
-    if (guardLock != NULL)
-       IOSimpleLockFree(guardLock);
+       if (guardLock != NULL) {
+               IOSimpleLockFree(guardLock);
+       }
 
-    OSObject::free();
+       OSObject::free();
 }
 
-IOReturn IOSyncer::wait(bool autoRelease)
+IOReturn
+IOSyncer::wait(bool autoRelease)
 {
-    IOInterruptState is = IOSimpleLockLockDisableInterrupt(guardLock);
+       IOInterruptState is = IOSimpleLockLockDisableInterrupt(guardLock);
 
-    if (threadMustStop) {
-       assert_wait((void *) &threadMustStop, false);
-       IOSimpleLockUnlockEnableInterrupt(guardLock, is);
-        thread_block(THREAD_CONTINUE_NULL);
-    }
-    else
-        IOSimpleLockUnlockEnableInterrupt(guardLock, is);
+       if (threadMustStop) {
+               assert_wait((void *) &threadMustStop, false);
+               IOSimpleLockUnlockEnableInterrupt(guardLock, is);
+               thread_block(THREAD_CONTINUE_NULL);
+       } else {
+               IOSimpleLockUnlockEnableInterrupt(guardLock, is);
+       }
 
-    IOReturn result = fResult; // Pick up before auto deleting!
+       IOReturn result = fResult; // Pick up before auto deleting!
 
-    if(autoRelease)
-       release();
+       if (autoRelease) {
+               release();
+       }
 
-    return result;
+       return result;
 }
 
-void IOSyncer::signal(IOReturn res, bool autoRelease)
+void
+IOSyncer::signal(IOReturn res, bool autoRelease)
 {
-    fResult = res;
-    privateSignal();
-    if(autoRelease)
-       release();
+       fResult = res;
+       privateSignal();
+       if (autoRelease) {
+               release();
+       }
 }
 
-void IOSyncer::privateSignal()
+void
+IOSyncer::privateSignal()
 {
-    if (threadMustStop) {
-         IOInterruptState is = IOSimpleLockLockDisableInterrupt(guardLock);
-         threadMustStop = false;
-         thread_wakeup_one((void *) &threadMustStop);
-         IOSimpleLockUnlockEnableInterrupt(guardLock, is);
-    }
+       if (threadMustStop) {
+               IOInterruptState is = IOSimpleLockLockDisableInterrupt(guardLock);
+               threadMustStop = false;
+               thread_wakeup_one((void *) &threadMustStop);
+               IOSimpleLockUnlockEnableInterrupt(guardLock, is);
+       }
 }