X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/6601e61aa18bf4f09af135ff61fc7f4771d23b06..0c530ab8987f0ae6a1a3d9284f40182b88852816:/iokit/Kernel/IOPMWorkArbiter.cpp

diff --git a/iokit/Kernel/IOPMWorkArbiter.cpp b/iokit/Kernel/IOPMWorkArbiter.cpp
new file mode 100644
index 000000000..060c457f0
--- /dev/null
+++ b/iokit/Kernel/IOPMWorkArbiter.cpp
@@ -0,0 +1,153 @@
+/*
+ * Copyright (c) 2001-2002 Apple Computer, Inc. All rights reserved.
+ *
+ * @APPLE_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 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.
+ *
+ * @APPLE_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;
+}
+
+