ThreadProfilerMark::ThreadProfilerMark(ThreadProfilerMark::Region r) {
_r = r;
_pp = NULL;
assert(((r > ThreadProfilerMark::noRegion) && (r < ThreadProfilerMark::maxRegion)), "ThreadProfilerMark::Region out of bounds");
Thread* tp = Thread::current();
if (tp != NULL && tp->is_Java_thread()) {
JavaThread* jtp = (JavaThread*) tp;
ThreadProfiler* pp = jtp->get_thread_profiler();
_pp = pp;
if (pp != NULL) {
pp->region_flag[r] = true;
}
}
}
void FlatProfiler::record_thread_ticks() {
int maxthreads, suspendedthreadcount;
JavaThread** threadsList;
bool interval_expired = false;
if (ProfileIntervals &&
(FlatProfiler::received_ticks >= interval_ticks_previous + ProfileIntervalsTicks)) {
interval_expired = true;
interval_ticks_previous = FlatProfiler::received_ticks;
}
// Try not to wait for the Threads_lock
if (Threads_lock->try_lock()) {
{ // Threads_lock scope
maxthreads = Threads::number_of_threads();
threadsList = NEW_C_HEAP_ARRAY(JavaThread *, maxthreads, mtInternal);
suspendedthreadcount = 0;
for (JavaThread* tp = Threads::first(); tp != NULL; tp = tp->next()) {
if (tp->is_Compiler_thread()) {
// Only record ticks for active compiler threads
CompilerThread* cthread = (CompilerThread*)tp;
if (cthread->task() != NULL) {
// The compiler is active. If we need to access any of the fields
// of the compiler task we should suspend the CompilerThread first.
FlatProfiler::compiler_ticks += 1;
continue;
}
}
// First externally suspend all threads by marking each for
// external suspension - so it will stop at its next transition
// Then do a safepoint
ThreadProfiler* pp = tp->get_thread_profiler();
if (pp != NULL && pp->engaged) {
MutexLockerEx ml(tp->SR_lock(), Mutex::_no_safepoint_check_flag);
if (!tp->is_external_suspend() && !tp->is_exiting()) {
tp->set_external_suspend();
threadsList[suspendedthreadcount++] = tp;
}
}
}
Threads_lock->unlock();
}