void
MM_MasterGCThread::masterThreadEntryPoint()
{
OMR_VMThread *omrVMThread = NULL;
Assert_MM_true(NULL != _collectorControlMutex);
Assert_MM_true(NULL == _masterGCThread);
/* Attach the thread as a system daemon thread */
/* You need a VM thread so that the stack walker can work */
omrVMThread = MM_EnvironmentBase::attachVMThread(_extensions->getOmrVM(), "Dedicated GC Master", MM_EnvironmentBase::ATTACH_GC_MASTER_THREAD);
if (NULL == omrVMThread) {
/* we failed to attach so notify the creating thread that we should fail to start up */
omrthread_monitor_enter(_collectorControlMutex);
_masterThreadState = STATE_ERROR;
omrthread_monitor_notify(_collectorControlMutex);
omrthread_exit(_collectorControlMutex);
} else {
/* thread attached successfully */
MM_EnvironmentBase *env = MM_EnvironmentBase::getEnvironment(omrVMThread);
/* attachVMThread could allocate an execute a barrier (since it that point, this thread acted as a mutator thread.
* Flush GC chaches (like barrier buffers) before turning into the master thread */
env->flushGCCaches();
env->setThreadType(GC_MASTER_THREAD);
/* Begin running the thread */
omrthread_monitor_enter(_collectorControlMutex);
_collector->preMasterGCThreadInitialize(env);
_masterThreadState = STATE_WAITING;
_masterGCThread = omrthread_self();
omrthread_monitor_notify(_collectorControlMutex);
do {
if (STATE_GC_REQUESTED == _masterThreadState) {
if (_runAsImplicit) {
handleConcurrent(env);
} else {
handleSTW(env);
}
}
if (STATE_WAITING == _masterThreadState) {
if (_runAsImplicit || !handleConcurrent(env)) {
omrthread_monitor_wait(_collectorControlMutex);
}
}
} while (STATE_TERMINATION_REQUESTED != _masterThreadState);
/* notify the other side that we are active so that they can continue running */
_masterThreadState = STATE_TERMINATED;
_masterGCThread = NULL;
omrthread_monitor_notify(_collectorControlMutex);
MM_EnvironmentBase::detachVMThread(_extensions->getOmrVM(), omrVMThread, MM_EnvironmentBase::ATTACH_GC_MASTER_THREAD);
omrthread_exit(_collectorControlMutex);
}
}
