xnu-792.18.15.tar.gz

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

diff --git a/iokit/Kernel/IOPMWorkArbiter.cpp b/iokit/Kernel/IOPMWorkArbiter.cpp
new file mode 100644 (file)
index 0000000..44c9842
--- /dev/null
+++ b/iokit/Kernel/IOPMWorkArbiter.cpp
@@ -0,0 +1,159 @@
+/*
+ * Copyright (c) 2001-2002 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. 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,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * 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_OSREFERENCE_LICENSE_HEADER_END@
+ */
+ 
+#include "IOPMWorkArbiter.h"
+#include "IOKit/IOLocks.h"
+#undef super
+#define super IOEventSource
+OSDefineMetaClassAndStructors(IOPMWorkArbiter, IOEventSource);
+
+/*************************************************************************/
+static
+void *    _dequeue(void ** inList, SInt32 inOffset)
+{
+    void *    oldListHead;
+    void *    newListHead;
+
+    do {
+        oldListHead = *inList;
+        if (oldListHead == NULL) {
+            break;
+        }
+        
+        newListHead = *(void **) (((char *) oldListHead) + inOffset);
+    } while (! OSCompareAndSwap((UInt32)oldListHead,
+                    (UInt32)newListHead, (UInt32 *)inList));
+    return oldListHead;
+}
+
+/*************************************************************************/
+static
+void    _enqueue(void ** inList, void * inNewLink, SInt32 inOffset)
+{
+    void *    oldListHead;
+    void *    newListHead = inNewLink;
+    void **    newLinkNextPtr = (void **) (((char *) inNewLink) + inOffset);
+
+    do {
+        oldListHead = *inList;
+        *newLinkNextPtr = oldListHead;
+    } while (! OSCompareAndSwap((UInt32)oldListHead, (UInt32)newListHead,
+                    (UInt32 *)inList));
+}
+
+/*************************************************************************/
+IOPMWorkArbiter *IOPMWorkArbiter::pmWorkArbiter(
+    IOPMrootDomain *inOwner)
+{
+    IOPMWorkArbiter     *me = new IOPMWorkArbiter;
+
+    if(me && !me->init((OSObject *)inOwner, 0) )
+    {
+        me->release();
+        return NULL;
+    }
+
+    return me;
+}
+
+/*************************************************************************/
+bool IOPMWorkArbiter::init(OSObject *owner, Action action)
+{
+    if(!(super::init(owner, (IOEventSource::Action) action))) 
+        return false;
+        
+    events = NULL;
+    fRootDomain = (IOPMrootDomain *)owner;
+    
+    if (!(tmpLock = IOLockAlloc())) {
+        panic("IOPMWorkArbiter::init can't alloc lock");
+    }
+    return true;
+}
+
+
+/*************************************************************************/
+bool IOPMWorkArbiter::clamshellStateChangeOccurred(uint32_t messageValue)
+{
+    PMEventEntry                 *new_one = NULL;
+
+    new_one = (PMEventEntry *)IOMalloc(sizeof(PMEventEntry));
+    if(!new_one) return false;
+    
+    new_one->actionType = IOPMWorkArbiter::kRootDomainClamshellChanged;
+    new_one->target = (IOService *)fRootDomain;
+    new_one->intArgument = messageValue;
+       new_one->target->retain();
+    
+    IOLockLock(tmpLock);
+    _enqueue((void **)&events, (void *)new_one, 0);
+    IOLockUnlock(tmpLock);
+    signalWorkAvailable();
+
+    return true;
+}
+
+
+/*************************************************************************/
+// checkForWork() is called in a gated context
+bool IOPMWorkArbiter::checkForWork()
+{
+    PMEventEntry                *theNode;
+    IOService                   *theTarget;
+    UInt16                      theAction;
+    
+    // Dequeue and process the state change request
+    IOLockLock(tmpLock);
+    if((theNode = (PMEventEntry *)_dequeue((void **)&events, 0)))
+    {
+      IOLockUnlock(tmpLock);
+        theTarget = theNode->target;
+        theAction = theNode->actionType;
+
+        switch (theAction)
+        {
+            case kRootDomainClamshellChanged:
+                theTarget->messageClients(
+                                kIOPMMessageClamshellStateChange, 
+                                (void *)theNode->intArgument);
+                break;
+        }
+
+               if (theTarget)
+                       theTarget->release();
+        IOFree((void *)theNode, sizeof(PMEventEntry));
+    }
+    else {
+      IOLockUnlock(tmpLock);
+    }
+    // Return true if there's more work to be done
+    if(events) return true;
+    else return false;
+}
+
+