/* virtual */ bool IOWorkLoop::runEventSources()
{
bool res = false;
bool traceWL = (gIOKitTrace & kIOTraceWorkLoops) ? true : false;
bool traceES = (gIOKitTrace & kIOTraceEventSources) ? true : false;
closeGate();
if (ISSETP(&fFlags, kLoopTerminate))
goto abort;
if (traceWL)
IOTimeStampStartConstant(IODBG_WORKLOOP(IOWL_WORK), (uintptr_t) 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), (uintptr_t) this, (uintptr_t) evnt);
more |= evnt->checkForWork();
if (traceES)
IOTimeStampEndConstant(IODBG_WORKLOOP(IOWL_CLIENT), (uintptr_t) this, (uintptr_t) 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), (uintptr_t) this);
abort:
openGate();
return res;
}
/* virtual */ void IOWorkLoop::threadMain()
{
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);
exitThread:
thread_t thread = workThread;
workThread = 0; // Say we don't have a loop and free ourselves
free();
thread_deallocate(thread);
(void) thread_terminate(thread);
}
/* virtual */ bool IOWorkLoop::runEventSources()
{
bool res = false;
closeGate();
if (ISSETP(&fFlags, kLoopTerminate))
goto abort;
IOTimeWorkS();
bool more;
do {
CLRP(&fFlags, kLoopRestart);
more = false;
IOInterruptState is = IOSimpleLockLockDisableInterrupt(workToDoLock);
workToDo = false;
IOSimpleLockUnlockEnableInterrupt(workToDoLock, is);
for (IOEventSource *evnt = eventChain; evnt; evnt = evnt->getNext()) {
IOTimeClientS();
more |= evnt->checkForWork();
IOTimeClientE();
if (ISSETP(&fFlags, kLoopTerminate))
goto abort;
else if (fFlags & kLoopRestart) {
more = true;
break;
}
}
} while (more);
res = true;
IOTimeWorkE();
abort:
openGate();
return res;
}
