2423 // block if a safepoint is in progress.
2424 // Also check for pending async exception (not including unsafe access error).
2425 // Note only the native==>VM/Java barriers can call this function and when
2426 // thread state is _thread_in_native_trans.
2427 void JavaThread::check_special_condition_for_native_trans(JavaThread *thread) {
2428   check_safepoint_and_suspend_for_native_trans(thread);
2429 
2430   if (thread->has_async_exception()) {
2431     // We are in _thread_in_native_trans state, don't handle unsafe
2432     // access error since that may block.
2433     thread->check_and_handle_async_exceptions(false);
2434   }
2435 }
2436 
2437 // This is a variant of the normal
2438 // check_special_condition_for_native_trans with slightly different
2439 // semantics for use by critical native wrappers.  It does all the
2440 // normal checks but also performs the transition back into
2441 // thread_in_Java state.  This is required so that critical natives
2442 // can potentially block and perform a GC if they are the last thread
2443 // exiting the GC_locker.
2444 void JavaThread::check_special_condition_for_native_trans_and_transition(JavaThread *thread) {
2445   check_special_condition_for_native_trans(thread);
2446 
2447   // Finish the transition
2448   thread->set_thread_state(_thread_in_Java);
2449 
2450   if (thread->do_critical_native_unlock()) {
2451     ThreadInVMfromJavaNoAsyncException tiv(thread);
2452     GC_locker::unlock_critical(thread);
2453     thread->clear_critical_native_unlock();
2454   }
2455 }
2456 
2457 // We need to guarantee the Threads_lock here, since resumes are not
2458 // allowed during safepoint synchronization
2459 // Can only resume from an external suspension
2460 void JavaThread::java_resume() {
2461   assert_locked_or_safepoint(Threads_lock);
2462 
2463   // Sanity check: thread is gone, has started exiting or the thread
2464   // was not externally suspended.
2465   if (!Threads::includes(this) || is_exiting() || !is_external_suspend()) {
2466     return;
2467   }
2468 
2469   MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
2470 
2471   clear_external_suspend();
2472 

2423 // block if a safepoint is in progress.
2424 // Also check for pending async exception (not including unsafe access error).
2425 // Note only the native==>VM/Java barriers can call this function and when
2426 // thread state is _thread_in_native_trans.
2427 void JavaThread::check_special_condition_for_native_trans(JavaThread *thread) {
2428   check_safepoint_and_suspend_for_native_trans(thread);
2429 
2430   if (thread->has_async_exception()) {
2431     // We are in _thread_in_native_trans state, don't handle unsafe
2432     // access error since that may block.
2433     thread->check_and_handle_async_exceptions(false);
2434   }
2435 }
2436 
2437 // This is a variant of the normal
2438 // check_special_condition_for_native_trans with slightly different
2439 // semantics for use by critical native wrappers.  It does all the
2440 // normal checks but also performs the transition back into
2441 // thread_in_Java state.  This is required so that critical natives
2442 // can potentially block and perform a GC if they are the last thread
2443 // exiting the GCLocker.
2444 void JavaThread::check_special_condition_for_native_trans_and_transition(JavaThread *thread) {
2445   check_special_condition_for_native_trans(thread);
2446 
2447   // Finish the transition
2448   thread->set_thread_state(_thread_in_Java);
2449 
2450   if (thread->do_critical_native_unlock()) {
2451     ThreadInVMfromJavaNoAsyncException tiv(thread);
2452     GCLocker::unlock_critical(thread);
2453     thread->clear_critical_native_unlock();
2454   }
2455 }
2456 
2457 // We need to guarantee the Threads_lock here, since resumes are not
2458 // allowed during safepoint synchronization
2459 // Can only resume from an external suspension
2460 void JavaThread::java_resume() {
2461   assert_locked_or_safepoint(Threads_lock);
2462 
2463   // Sanity check: thread is gone, has started exiting or the thread
2464   // was not externally suspended.
2465   if (!Threads::includes(this) || is_exiting() || !is_external_suspend()) {
2466     return;
2467   }
2468 
2469   MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
2470 
2471   clear_external_suspend();
2472