X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/c0fea4742e91338fffdcf79f86a7c1d5e2b97eb1..94ff46dc2849db4d43eaaf144872decc522aafb4:/iokit/Kernel/IOWorkLoop.cpp?ds=sidebyside
diff --git a/iokit/Kernel/IOWorkLoop.cpp b/iokit/Kernel/IOWorkLoop.cpp
index 81e03f4ab..d046938d2 100644
--- a/iokit/Kernel/IOWorkLoop.cpp
+++ b/iokit/Kernel/IOWorkLoop.cpp
@@ -1,46 +1,56 @@
/*
- * Copyright (c) 1998-2000 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 1998-2010 Apple 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
+ * @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 OR NON-INFRINGEMENT. Please see the
- * License for the specific language governing rights and limitations
- * under the License.
- *
- * @APPLE_LICENSE_HEADER_END@
+ * 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@
*/
-/*
-Copyright (c) 1998 Apple Computer, Inc. All rights reserved.
-HISTORY
- 1998-7-13 Godfrey van der Linden(gvdl)
- Created.
-*/
+#include <pexpert/pexpert.h>
#include <IOKit/IOWorkLoop.h>
#include <IOKit/IOEventSource.h>
#include <IOKit/IOInterruptEventSource.h>
#include <IOKit/IOCommandGate.h>
+#include <IOKit/IOCommandPool.h>
#include <IOKit/IOTimeStamp.h>
+#include <IOKit/IOKitDebug.h>
+#include <libkern/OSDebug.h>
+#include <kern/thread.h>
#define super OSObject
OSDefineMetaClassAndStructors(IOWorkLoop, OSObject);
// Block of unused functions intended for future use
+#if __LP64__
+OSMetaClassDefineReservedUnused(IOWorkLoop, 0);
+OSMetaClassDefineReservedUnused(IOWorkLoop, 1);
+OSMetaClassDefineReservedUnused(IOWorkLoop, 2);
+#else
OSMetaClassDefineReservedUsed(IOWorkLoop, 0);
OSMetaClassDefineReservedUsed(IOWorkLoop, 1);
-
-OSMetaClassDefineReservedUnused(IOWorkLoop, 2);
+OSMetaClassDefineReservedUsed(IOWorkLoop, 2);
+#endif
OSMetaClassDefineReservedUnused(IOWorkLoop, 3);
OSMetaClassDefineReservedUnused(IOWorkLoop, 4);
OSMetaClassDefineReservedUnused(IOWorkLoop, 5);
@@ -48,386 +58,688 @@ OSMetaClassDefineReservedUnused(IOWorkLoop, 6);
OSMetaClassDefineReservedUnused(IOWorkLoop, 7);
enum IOWorkLoopState { kLoopRestart = 0x1, kLoopTerminate = 0x2 };
-static inline void SETP(void *addr, unsigned int flag)
- { unsigned int *num = (unsigned int *) addr; *num |= flag; }
-static inline void CLRP(void *addr, unsigned int flag)
- { unsigned int *num = (unsigned int *) addr; *num &= ~flag; }
-static inline bool ISSETP(void *addr, unsigned int flag)
- { unsigned int *num = (unsigned int *) addr; return (*num & flag) != 0; }
+static inline void
+SETP(void *addr, unsigned int flag)
+{
+ unsigned char *num = (unsigned char *) addr; *num |= flag;
+}
+static inline void
+CLRP(void *addr, unsigned int flag)
+{
+ unsigned char *num = (unsigned char *) addr; *num &= ~flag;
+}
+static inline bool
+ISSETP(void *addr, unsigned int flag)
+{
+ unsigned char *num = (unsigned char *) addr; return (*num & flag) != 0;
+}
#define fFlags loopRestart
-bool IOWorkLoop::init()
-{
- // The super init and gateLock allocation MUST be done first
- if ( !super::init() )
- return false;
-
- if ( !(gateLock = IORecursiveLockAlloc()) )
- return false;
+#define passiveEventChain reserved->passiveEventChain
- if ( !(workToDoLock = IOSimpleLockAlloc()) )
- return false;
+#if IOKITSTATS
- controlG = IOCommandGate::
- commandGate(this, OSMemberFunctionCast(IOCommandGate::Action,
- this, &IOWorkLoop::_maintRequest));
- if ( !controlG )
- return false;
+#define IOStatisticsRegisterCounter() \
+do { \
+ reserved->counter = IOStatistics::registerWorkLoop(this); \
+} while(0)
- IOSimpleLockInit(workToDoLock);
- workToDo = false;
+#define IOStatisticsUnregisterCounter() \
+do { \
+ if (reserved) \
+ IOStatistics::unregisterWorkLoop(reserved->counter); \
+} while(0)
- // Point the controlGate at the workLoop. Usually addEventSource
- // does this automatically. The problem is in this case addEventSource
- // uses the control gate and it has to be bootstrapped.
- controlG->setWorkLoop(this);
- if (addEventSource(controlG) != kIOReturnSuccess)
- return false;
+#define IOStatisticsOpenGate() \
+do { \
+ IOStatistics::countWorkLoopOpenGate(reserved->counter); \
+ if (reserved->lockInterval) lockTime(); \
+} while(0)
+#define IOStatisticsCloseGate() \
+do { \
+ IOStatistics::countWorkLoopCloseGate(reserved->counter); \
+ if (reserved->lockInterval) reserved->lockTime = mach_absolute_time(); \
+} while(0)
- IOThreadFunc cptr =
- OSMemberFunctionCast(IOThreadFunc, this, &IOWorkLoop::threadMain);
- workThread = IOCreateThread(cptr, this);
- if (!workThread)
- return false;
+#define IOStatisticsAttachEventSource() \
+do { \
+ IOStatistics::attachWorkLoopEventSource(reserved->counter, inEvent->reserved->counter); \
+} while(0)
- return true;
-}
+#define IOStatisticsDetachEventSource() \
+do { \
+ IOStatistics::detachWorkLoopEventSource(reserved->counter, inEvent->reserved->counter); \
+} while(0)
-IOWorkLoop *
-IOWorkLoop::workLoop()
-{
- IOWorkLoop *me = new IOWorkLoop;
+#else
- if (me && !me->init()) {
- me->release();
- return 0;
- }
+#define IOStatisticsRegisterCounter()
+#define IOStatisticsUnregisterCounter()
+#define IOStatisticsOpenGate()
+#define IOStatisticsCloseGate()
+#define IOStatisticsAttachEventSource()
+#define IOStatisticsDetachEventSource()
- return me;
-}
+#endif /* IOKITSTATS */
-// Free is called twice:
-// First when the atomic retainCount transitions from 1 -> 0
-// Secondly when the work loop itself is commiting hari kari
-// Hence the each leg of the free must be single threaded.
-void IOWorkLoop::free()
+bool
+IOWorkLoop::init()
{
- if (workThread) {
- IOInterruptState is;
+ // The super init and gateLock allocation MUST be done first.
+ if (!super::init()) {
+ return false;
+ }
- // If we are here then we must be trying to shut down this work loop
- // in this case disable all of the event source, mark the loop for
- // as terminating and wakeup the work thread itself and return
- // Note: we hold the gate across the entire operation mainly for the
- // benefit of our event sources so we can disable them cleanly.
- closeGate();
+ // Allocate our ExpansionData if it hasn't been allocated already.
+ if (!reserved) {
+ reserved = IONew(ExpansionData, 1);
+ if (!reserved) {
+ return false;
+ }
- disableAllEventSources();
+ bzero(reserved, sizeof(ExpansionData));
+ }
- is = IOSimpleLockLockDisableInterrupt(workToDoLock);
- SETP(&fFlags, kLoopTerminate);
- thread_wakeup_one((void *) &workToDo);
- IOSimpleLockUnlockEnableInterrupt(workToDoLock, is);
+ if (gateLock == NULL) {
+ if (!(gateLock = IORecursiveLockAlloc())) {
+ return false;
+ }
+ }
- openGate();
- }
- else /* !workThread */ {
- IOEventSource *event, *next;
-
- for (event = eventChain; event; event = next) {
- next = event->getNext();
- event->setWorkLoop(0);
- event->setNext(0);
- event->release();
- }
- eventChain = 0;
-
- // Either we have a partial initialisation to clean up
- // or we the workThread itself is performing hari-kari.
- // either way clean up all of our resources and return.
-
- if (controlG) {
- controlG->release();
- controlG = 0;
+ if (workToDoLock == NULL) {
+ if (!(workToDoLock = IOSimpleLockAlloc())) {
+ return false;
+ }
+ IOSimpleLockInit(workToDoLock);
+ workToDo = false;
}
- if (workToDoLock) {
- IOSimpleLockFree(workToDoLock);
- workToDoLock = 0;
+ IOStatisticsRegisterCounter();
+
+ if (controlG == NULL) {
+ controlG = IOCommandGate::commandGate(
+ this,
+ OSMemberFunctionCast(
+ IOCommandGate::Action,
+ this,
+ &IOWorkLoop::_maintRequest));
+
+ if (!controlG) {
+ return false;
+ }
+ // Point the controlGate at the workLoop. Usually addEventSource
+ // does this automatically. The problem is in this case addEventSource
+ // uses the control gate and it has to be bootstrapped.
+ controlG->setWorkLoop(this);
+ if (addEventSource(controlG) != kIOReturnSuccess) {
+ return false;
+ }
}
- if (gateLock) {
- IORecursiveLockFree(gateLock);
- gateLock = 0;
+ if (workThread == NULL) {
+ thread_continue_t cptr = OSMemberFunctionCast(
+ thread_continue_t,
+ this,
+ &IOWorkLoop::threadMain);
+ if (KERN_SUCCESS != kernel_thread_start(cptr, this, &workThread)) {
+ return false;
+ }
}
- super::free();
- }
+ (void) thread_set_tag(workThread, THREAD_TAG_IOWORKLOOP);
+ return true;
}
-IOReturn IOWorkLoop::addEventSource(IOEventSource *newEvent)
-{
- return controlG->runCommand((void *) mAddEvent, (void *) newEvent);
-}
-
-IOReturn IOWorkLoop::removeEventSource(IOEventSource *toRemove)
+IOWorkLoop *
+IOWorkLoop::workLoop()
{
- return controlG->runCommand((void *) mRemoveEvent, (void *) toRemove);
+ return IOWorkLoop::workLoopWithOptions(0);
}
-void IOWorkLoop::enableAllEventSources() const
+IOWorkLoop *
+IOWorkLoop::workLoopWithOptions(IOOptionBits options)
{
- IOEventSource *event;
+ IOWorkLoop *me = new IOWorkLoop;
+
+ if (me && options) {
+ me->reserved = IONew(ExpansionData, 1);
+ if (!me->reserved) {
+ me->release();
+ return NULL;
+ }
+ bzero(me->reserved, sizeof(ExpansionData));
+ me->reserved->options = options;
+ }
+
+ if (me && !me->init()) {
+ me->release();
+ return NULL;
+ }
- for (event = eventChain; event; event = event->getNext())
- event->enable();
+ return me;
}
-void IOWorkLoop::disableAllEventSources() const
+// Free is called twice:
+// First when the atomic retainCount transitions from 1 -> 0
+// Secondly when the work loop itself is commiting hari kari
+// Hence the each leg of the free must be single threaded.
+void
+IOWorkLoop::free()
{
- IOEventSource *event;
-
- for (event = eventChain; event; event = event->getNext())
- if (event != controlG) // Don't disable the control gate
- event->disable();
+ if (workThread) {
+ IOInterruptState is;
+
+ // If we are here then we must be trying to shut down this work loop
+ // in this case disable all of the event source, mark the loop
+ // as terminating and wakeup the work thread itself and return
+ // Note: we hold the gate across the entire operation mainly for the
+ // benefit of our event sources so we can disable them cleanly.
+ closeGate();
+
+ disableAllEventSources();
+
+ is = IOSimpleLockLockDisableInterrupt(workToDoLock);
+ SETP(&fFlags, kLoopTerminate);
+ thread_wakeup_thread((void *) &workToDo, workThread);
+ IOSimpleLockUnlockEnableInterrupt(workToDoLock, is);
+
+ openGate();
+ } else { /* !workThread */
+ IOEventSource *event, *next;
+
+ for (event = eventChain; event; event = next) {
+ next = event->getNext();
+ event->setWorkLoop(NULL);
+ event->setNext(NULL);
+ event->release();
+ }
+ eventChain = NULL;
+
+ for (event = passiveEventChain; event; event = next) {
+ next = event->getNext();
+ event->setWorkLoop(NULL);
+ event->setNext(NULL);
+ event->release();
+ }
+ passiveEventChain = NULL;
+
+ // Either we have a partial initialization to clean up
+ // or the workThread itself is performing hari-kari.
+ // Either way clean up all of our resources and return.
+
+ if (controlG) {
+ controlG->workLoop = NULL;
+ controlG->release();
+ controlG = NULL;
+ }
+
+ if (workToDoLock) {
+ IOSimpleLockFree(workToDoLock);
+ workToDoLock = NULL;
+ }
+
+ if (gateLock) {
+ IORecursiveLockFree(gateLock);
+ gateLock = NULL;
+ }
+
+ IOStatisticsUnregisterCounter();
+
+ if (reserved) {
+ IODelete(reserved, ExpansionData, 1);
+ reserved = NULL;
+ }
+
+ super::free();
+ }
}
-void IOWorkLoop::enableAllInterrupts() const
+IOReturn
+IOWorkLoop::addEventSource(IOEventSource *newEvent)
{
- IOEventSource *event;
+ if ((workThread)
+ && !thread_has_thread_name(workThread)
+ && (newEvent->owner)
+ && !OSDynamicCast(IOCommandPool, newEvent->owner)) {
+ thread_set_thread_name(workThread, newEvent->owner->getMetaClass()->getClassName());
+ }
- for (event = eventChain; event; event = event->getNext())
- if (OSDynamicCast(IOInterruptEventSource, event))
- event->enable();
+ return controlG->runCommand((void *) mAddEvent, (void *) newEvent);
}
-void IOWorkLoop::disableAllInterrupts() const
+IOReturn
+IOWorkLoop::removeEventSource(IOEventSource *toRemove)
{
- IOEventSource *event;
-
- for (event = eventChain; event; event = event->getNext())
- if (OSDynamicCast(IOInterruptEventSource, event))
- event->disable();
+ return controlG->runCommand((void *) mRemoveEvent, (void *) toRemove);
}
-#if KDEBUG
-#define IOTimeClientS() \
-do { \
- IOTimeStampStart(IODBG_WORKLOOP(IOWL_CLIENT), \
- (unsigned int) this, (unsigned int) event); \
-} while(0)
+void
+IOWorkLoop::enableAllEventSources() const
+{
+ IOEventSource *event;
-#define IOTimeClientE() \
-do { \
- IOTimeStampEnd(IODBG_WORKLOOP(IOWL_CLIENT), \
- (unsigned int) this, (unsigned int) event); \
-} while(0)
+ for (event = eventChain; event; event = event->getNext()) {
+ event->enable();
+ }
-#define IOTimeWorkS() \
-do { \
- IOTimeStampStart(IODBG_WORKLOOP(IOWL_WORK), (unsigned int) this); \
-} while(0)
+ for (event = passiveEventChain; event; event = event->getNext()) {
+ event->enable();
+ }
+}
-#define IOTimeWorkE() \
-do { \
- IOTimeStampEnd(IODBG_WORKLOOP(IOWL_WORK),(unsigned int) this); \
-} while(0)
+void
+IOWorkLoop::disableAllEventSources() const
+{
+ IOEventSource *event;
+
+ for (event = eventChain; event; event = event->getNext()) {
+ event->disable();
+ }
-#else /* !KDEBUG */
+ /* NOTE: controlG is in passiveEventChain since it's an IOCommandGate */
+ for (event = passiveEventChain; event; event = event->getNext()) {
+ if (event != controlG) { // Don't disable the control gate
+ event->disable();
+ }
+ }
+}
-#define IOTimeClientS()
-#define IOTimeClientE()
-#define IOTimeWorkS()
-#define IOTimeWorkE()
+void
+IOWorkLoop::enableAllInterrupts() const
+{
+ IOEventSource *event;
-#endif /* KDEBUG */
+ for (event = eventChain; event; event = event->getNext()) {
+ if (OSDynamicCast(IOInterruptEventSource, event)) {
+ event->enable();
+ }
+ }
+}
-/* virtual */ bool IOWorkLoop::runEventSources()
+void
+IOWorkLoop::disableAllInterrupts() const
{
- bool res = false;
- closeGate();
- if (ISSETP(&fFlags, kLoopTerminate))
- goto abort;
+ IOEventSource *event;
+
+ for (event = eventChain; event; event = event->getNext()) {
+ if (OSDynamicCast(IOInterruptEventSource, event)) {
+ event->disable();
+ }
+ }
+}
- IOTimeWorkS();
- bool more;
- do {
- CLRP(&fFlags, kLoopRestart);
- workToDo = more = false;
- for (IOEventSource *evnt = eventChain; evnt; evnt = evnt->getNext()) {
- IOTimeClientS();
- more |= evnt->checkForWork();
- IOTimeClientE();
+/* virtual */ bool
+IOWorkLoop::runEventSources()
+{
+ bool res = false;
+ bool traceWL = (gIOKitTrace & kIOTraceWorkLoops) ? true : false;
+ bool traceES = (gIOKitTrace & kIOTraceEventSources) ? true : false;
- if (ISSETP(&fFlags, kLoopTerminate))
+ closeGate();
+ if (ISSETP(&fFlags, kLoopTerminate)) {
goto abort;
- else if (fFlags & kLoopRestart) {
- more = true;
- break;
- }
}
- } while (more);
- res = true;
- IOTimeWorkE();
+ if (traceWL) {
+ IOTimeStampStartConstant(IODBG_WORKLOOP(IOWL_WORK), VM_KERNEL_ADDRHIDE(this));
+ }
+
+ bool more;
+ do {
+ CLRP(&fFlags, kLoopRestart);
+ more = false;
+ IOInterruptState is = IOSimpleLockLockDisableInterrupt(workToDoLock);
+ workToDo = false;
+ IOSimpleLockUnlockEnableInterrupt(workToDoLock, is);
+ /* NOTE: only loop over event sources in eventChain. Bypass "passive" event sources for performance */
+ for (IOEventSource *evnt = eventChain; evnt; evnt = evnt->getNext()) {
+ if (traceES) {
+ IOTimeStampStartConstant(IODBG_WORKLOOP(IOWL_CLIENT), VM_KERNEL_ADDRHIDE(this), VM_KERNEL_ADDRHIDE(evnt));
+ }
+
+ more |= evnt->checkForWork();
+
+ if (traceES) {
+ IOTimeStampEndConstant(IODBG_WORKLOOP(IOWL_CLIENT), VM_KERNEL_ADDRHIDE(this), VM_KERNEL_ADDRHIDE(evnt));
+ }
+
+ if (ISSETP(&fFlags, kLoopTerminate)) {
+ goto abort;
+ } else if (fFlags & kLoopRestart) {
+ more = true;
+ break;
+ }
+ }
+ } while (more);
+
+ res = true;
+
+ if (traceWL) {
+ IOTimeStampEndConstant(IODBG_WORKLOOP(IOWL_WORK), VM_KERNEL_ADDRHIDE(this));
+ }
abort:
- openGate();
- return res;
+ openGate();
+ return res;
}
-/* virtual */ void IOWorkLoop::threadMain()
+/* virtual */ void
+IOWorkLoop::threadMain()
{
- do {
- if ( !runEventSources() )
- goto exitThread;
+restartThread:
+ do {
+ if (!runEventSources()) {
+ goto exitThread;
+ }
+
+ IOInterruptState is = IOSimpleLockLockDisableInterrupt(workToDoLock);
+ if (!ISSETP(&fFlags, kLoopTerminate) && !workToDo) {
+ assert_wait((void *) &workToDo, false);
+ IOSimpleLockUnlockEnableInterrupt(workToDoLock, is);
+ thread_continue_t cptr = NULL;
+ if (!reserved || !(kPreciousStack & reserved->options)) {
+ cptr = OSMemberFunctionCast(
+ thread_continue_t, this, &IOWorkLoop::threadMain);
+ }
+ thread_block_parameter(cptr, this);
+ goto restartThread;
+ /* NOTREACHED */
+ }
+
+ // At this point we either have work to do or we need
+ // to commit suicide. But no matter
+ // Clear the simple lock and retore the interrupt state
+ IOSimpleLockUnlockEnableInterrupt(workToDoLock, is);
+ } while (workToDo);
- IOInterruptState is = IOSimpleLockLockDisableInterrupt(workToDoLock);
- if ( !ISSETP(&fFlags, kLoopTerminate) && !workToDo) {
- assert_wait((void *) &workToDo, false);
- IOSimpleLockUnlockEnableInterrupt(workToDoLock, is);
-
- thread_continue_t cptr = OSMemberFunctionCast(
- thread_continue_t, this, &IOWorkLoop::threadMain);
- thread_block_parameter(cptr, this);
- /* NOTREACHED */
- }
+exitThread:
+ closeGate();
+ thread_t thread = workThread;
+ workThread = NULL; // Say we don't have a loop and free ourselves
+ openGate();
- // At this point we either have work to do or we need
- // to commit suicide. But no matter
- // Clear the simple lock and retore the interrupt state
- IOSimpleLockUnlockEnableInterrupt(workToDoLock, is);
- } while(workToDo);
+ free();
-exitThread:
- workThread = 0; // Say we don't have a loop and free ourselves
- free();
- IOExitThread();
+ thread_deallocate(thread);
+ (void) thread_terminate(thread);
}
-IOThread IOWorkLoop::getThread() const
+IOThread
+IOWorkLoop::getThread() const
{
- return workThread;
+ return workThread;
}
-bool IOWorkLoop::onThread() const
+bool
+IOWorkLoop::onThread() const
{
- return (IOThreadSelf() == workThread);
+ return IOThreadSelf() == workThread;
}
-bool IOWorkLoop::inGate() const
+bool
+IOWorkLoop::inGate() const
{
- return IORecursiveLockHaveLock(gateLock);
+ return IORecursiveLockHaveLock(gateLock);
}
// Internal APIs used by event sources to control the thread
-void IOWorkLoop::signalWorkAvailable()
+void
+IOWorkLoop::signalWorkAvailable()
+{
+ if (workToDoLock) {
+ IOInterruptState is = IOSimpleLockLockDisableInterrupt(workToDoLock);
+ workToDo = true;
+ thread_wakeup_thread((void *) &workToDo, workThread);
+ IOSimpleLockUnlockEnableInterrupt(workToDoLock, is);
+ }
+}
+
+void
+IOWorkLoop::openGate()
+{
+ IOStatisticsOpenGate();
+ IORecursiveLockUnlock(gateLock);
+}
+
+void
+IOWorkLoop::closeGate()
{
- if (workToDoLock) {
- IOInterruptState is = IOSimpleLockLockDisableInterrupt(workToDoLock);
- workToDo = true;
- thread_wakeup_one((void *) &workToDo);
- IOSimpleLockUnlockEnableInterrupt(workToDoLock, is);
- }
+ IORecursiveLockLock(gateLock);
+ IOStatisticsCloseGate();
}
-void IOWorkLoop::openGate()
+bool
+IOWorkLoop::tryCloseGate()
{
- IORecursiveLockUnlock(gateLock);
+ bool res = (IORecursiveLockTryLock(gateLock) != 0);
+ if (res) {
+ IOStatisticsCloseGate();
+ }
+ return res;
}
-void IOWorkLoop::closeGate()
+int
+IOWorkLoop::sleepGate(void *event, UInt32 interuptibleType)
{
- IORecursiveLockLock(gateLock);
+ int res;
+ IOStatisticsOpenGate();
+ res = IORecursiveLockSleep(gateLock, event, interuptibleType);
+ IOStatisticsCloseGate();
+ return res;
}
-bool IOWorkLoop::tryCloseGate()
+int
+IOWorkLoop::sleepGate(void *event, AbsoluteTime deadline, UInt32 interuptibleType)
{
- return IORecursiveLockTryLock(gateLock) != 0;
+ int res;
+ IOStatisticsOpenGate();
+ res = IORecursiveLockSleepDeadline(gateLock, event, deadline, interuptibleType);
+ IOStatisticsCloseGate();
+ return res;
}
-int IOWorkLoop::sleepGate(void *event, UInt32 interuptibleType)
+void
+IOWorkLoop::wakeupGate(void *event, bool oneThread)
{
- return IORecursiveLockSleep(gateLock, event, interuptibleType);
+ IORecursiveLockWakeup(gateLock, event, oneThread);
}
-void IOWorkLoop::wakeupGate(void *event, bool oneThread)
+static IOReturn
+IOWorkLoopActionToBlock(OSObject *owner,
+ void *arg0, void *arg1,
+ void *arg2, void *arg3)
{
- IORecursiveLockWakeup(gateLock, event, oneThread);
+ return ((IOWorkLoop::ActionBlock) arg0)();
}
-IOReturn IOWorkLoop::runAction(Action inAction, OSObject *target,
- void *arg0, void *arg1,
- void *arg2, void *arg3)
+IOReturn
+IOWorkLoop::runActionBlock(ActionBlock action)
{
- IOReturn res;
+ return runAction(&IOWorkLoopActionToBlock, this, action);
+}
- // closeGate is recursive so don't worry if we already hold the lock.
- closeGate();
- res = (*inAction)(target, arg0, arg1, arg2, arg3);
- openGate();
+IOReturn
+IOWorkLoop::runAction(Action inAction, OSObject *target,
+ void *arg0, void *arg1,
+ void *arg2, void *arg3)
+{
+ IOReturn res;
+
+ // closeGate is recursive so don't worry if we already hold the lock.
+ closeGate();
+ res = (*inAction)(target, arg0, arg1, arg2, arg3);
+ openGate();
- return res;
+ return res;
}
-IOReturn IOWorkLoop::_maintRequest(void *inC, void *inD, void *, void *)
+IOReturn
+IOWorkLoop::_maintRequest(void *inC, void *inD, void *, void *)
{
- maintCommandEnum command = (maintCommandEnum) (vm_address_t) inC;
- IOEventSource *inEvent = (IOEventSource *) inD;
- IOReturn res = kIOReturnSuccess;
+ maintCommandEnum command = (maintCommandEnum) (uintptr_t) inC;
+ IOEventSource *inEvent = (IOEventSource *) inD;
+ IOReturn res = kIOReturnSuccess;
+
+ switch (command) {
+ case mAddEvent:
+ if (!inEvent->getWorkLoop()) {
+ SETP(&fFlags, kLoopRestart);
+
+ inEvent->retain();
+ inEvent->setWorkLoop(this);
+ inEvent->setNext(NULL);
+
+ /* Check if this is a passive or active event source being added */
+ if (eventSourcePerformsWork(inEvent)) {
+ if (!eventChain) {
+ eventChain = inEvent;
+ } else {
+ IOEventSource *event, *next;
+
+ for (event = eventChain; (next = event->getNext()); event = next) {
+ ;
+ }
+ event->setNext(inEvent);
+ }
+ } else {
+ if (!passiveEventChain) {
+ passiveEventChain = inEvent;
+ } else {
+ IOEventSource *event, *next;
+
+ for (event = passiveEventChain; (next = event->getNext()); event = next) {
+ ;
+ }
+ event->setNext(inEvent);
+ }
+ }
+ IOStatisticsAttachEventSource();
+ }
+ break;
+
+ case mRemoveEvent:
+ if (inEvent->getWorkLoop()) {
+ IOStatisticsDetachEventSource();
+
+ if (eventSourcePerformsWork(inEvent)) {
+ if (eventChain == inEvent) {
+ eventChain = inEvent->getNext();
+ } else {
+ IOEventSource *event, *next = NULL;
+
+ event = eventChain;
+ if (event) {
+ while ((next = event->getNext()) && (next != inEvent)) {
+ event = next;
+ }
+ }
+
+ if (!next) {
+ res = kIOReturnBadArgument;
+ break;
+ }
+ event->setNext(inEvent->getNext());
+ }
+ } else {
+ if (passiveEventChain == inEvent) {
+ passiveEventChain = inEvent->getNext();
+ } else {
+ IOEventSource *event, *next = NULL;
+
+ event = passiveEventChain;
+ if (event) {
+ while ((next = event->getNext()) && (next != inEvent)) {
+ event = next;
+ }
+ }
+
+ if (!next) {
+ res = kIOReturnBadArgument;
+ break;
+ }
+ event->setNext(inEvent->getNext());
+ }
+ }
+
+ inEvent->setWorkLoop(NULL);
+ inEvent->setNext(NULL);
+ inEvent->release();
+ SETP(&fFlags, kLoopRestart);
+ }
+ break;
- switch (command)
- {
- case mAddEvent:
- if (!inEvent->getWorkLoop()) {
- SETP(&fFlags, kLoopRestart);
+ default:
+ return kIOReturnUnsupported;
+ }
+
+ return res;
+}
- inEvent->retain();
- inEvent->setWorkLoop(this);
- inEvent->setNext(0);
-
- if (!eventChain)
- eventChain = inEvent;
- else {
- IOEventSource *event, *next;
-
- for (event = eventChain; (next = event->getNext()); event = next)
- ;
- event->setNext(inEvent);
- }
- }
- break;
+bool
+IOWorkLoop::eventSourcePerformsWork(IOEventSource *inEventSource)
+{
+ bool result = true;
+
+ /*
+ * The idea here is to see if the subclass of IOEventSource has overridden checkForWork().
+ * The assumption is that if you override checkForWork(), you need to be
+ * active and not passive.
+ *
+ * We picked a known quantity controlG that does not override
+ * IOEventSource::checkForWork(), namely the IOCommandGate associated with
+ * the workloop to which this event source is getting attached.
+ *
+ * We do a pointer comparison on the offset in the vtable for inNewEvent against
+ * the offset in the vtable for inReferenceEvent. This works because
+ * IOCommandGate's slot for checkForWork() has the address of
+ * IOEventSource::checkForWork() in it.
+ *
+ * Think of OSMemberFunctionCast yielding the value at the vtable offset for
+ * checkForWork() here. We're just testing to see if it's the same or not.
+ *
+ */
+
+ if (IOEventSource::kPassive & inEventSource->flags) {
+ result = false;
+ } else if (IOEventSource::kActive & inEventSource->flags) {
+ result = true;
+ } else if (controlG) {
+ void * ptr1;
+ void * ptr2;
+
+ ptr1 = OSMemberFunctionCast(void*, inEventSource, &IOEventSource::checkForWork);
+ ptr2 = OSMemberFunctionCast(void*, controlG, &IOEventSource::checkForWork);
+
+ if (ptr1 == ptr2) {
+ result = false;
+ }
+ }
- case mRemoveEvent:
- if (inEvent->getWorkLoop()) {
- if (eventChain == inEvent)
- eventChain = inEvent->getNext();
- else {
- IOEventSource *event, *next;
-
- event = eventChain;
- while ((next = event->getNext()) && next != inEvent)
- event = next;
-
- if (!next) {
- res = kIOReturnBadArgument;
- break;
- }
- event->setNext(inEvent->getNext());
- }
-
- inEvent->setWorkLoop(0);
- inEvent->setNext(0);
- inEvent->release();
- SETP(&fFlags, kLoopRestart);
- }
- break;
+ return result;
+}
- default:
- return kIOReturnUnsupported;
- }
+void
+IOWorkLoop::lockTime(void)
+{
+ uint64_t time;
+ time = mach_absolute_time() - reserved->lockTime;
+ if (time > reserved->lockInterval) {
+ absolutetime_to_nanoseconds(time, &time);
+ if (kTimeLockPanics & reserved->options) {
+ panic("IOWorkLoop %p lock time %qd us", this, time / 1000ULL);
+ } else {
+ OSReportWithBacktrace("IOWorkLoop %p lock time %qd us", this, time / 1000ULL);
+ }
+ }
+}
- return res;
+void
+IOWorkLoop::setMaximumLockTime(uint64_t interval, uint32_t options)
+{
+ IORecursiveLockLock(gateLock);
+ reserved->lockInterval = interval;
+ reserved->options = (reserved->options & ~kTimeLockPanics) | (options & kTimeLockPanics);
+ IORecursiveLockUnlock(gateLock);
}