798 WB_ENTRY(void, WB_LockCompilation(JNIEnv* env, jobject o, jlong timeout))
799 WhiteBox::compilation_locked = true;
800 WB_END
801
802 WB_ENTRY(void, WB_UnlockCompilation(JNIEnv* env, jobject o))
803 MonitorLockerEx mo(Compilation_lock, Mutex::_no_safepoint_check_flag);
804 WhiteBox::compilation_locked = false;
805 mo.notify_all();
806 WB_END
807
808 void WhiteBox::sweeper_thread_entry(JavaThread* thread, TRAPS) {
809 guarantee(WhiteBoxAPI, "internal testing API :: WhiteBox has to be enabled");
810 {
811 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
812 NMethodSweeper::_should_sweep = true;
813 }
814 NMethodSweeper::possibly_sweep();
815 }
816
817 JavaThread* WhiteBox::create_sweeper_thread(TRAPS) {
818 // create sweeper thread w/ custom entry -- one iteration instead of loop
819 CodeCacheSweeperThread* sweeper_thread = new CodeCacheSweeperThread();
820 sweeper_thread->set_entry_point(&WhiteBox::sweeper_thread_entry);
821
822 // create j.l.Thread object and associate it w/ sweeper thread
823 {
824 // inherit deamon property from current thread
825 bool is_daemon = java_lang_Thread::is_daemon(JavaThread::current()->threadObj());
826
827 HandleMark hm(THREAD);
828 Handle thread_group(THREAD, Universe::system_thread_group());
829 const char* name = "WB Sweeper thread";
830 sweeper_thread->allocate_threadObj(thread_group, name, is_daemon, THREAD);
831 }
832
833 {
834 MutexLocker mu(Threads_lock, THREAD);
835 Threads::add(sweeper_thread);
836 }
837 return sweeper_thread;
838 }
839
840 WB_ENTRY(jobject, WB_ForceNMethodSweep(JNIEnv* env, jobject o))
841 JavaThread* sweeper_thread = WhiteBox::create_sweeper_thread(Thread::current());
842 if (sweeper_thread == NULL) {
843 return NULL;
844 }
845 jobject result = JNIHandles::make_local(env, sweeper_thread->threadObj());
846 Thread::start(sweeper_thread);
847 return result;
848 WB_END
849
850 WB_ENTRY(jboolean, WB_IsInStringTable(JNIEnv* env, jobject o, jstring javaString))
851 ResourceMark rm(THREAD);
852 int len;
853 jchar* name = java_lang_String::as_unicode_string(JNIHandles::resolve(javaString), len, CHECK_false);
854 return (StringTable::lookup(name, len) != NULL);
855 WB_END
856
857 WB_ENTRY(void, WB_FullGC(JNIEnv* env, jobject o))
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798 WB_ENTRY(void, WB_LockCompilation(JNIEnv* env, jobject o, jlong timeout))
799 WhiteBox::compilation_locked = true;
800 WB_END
801
802 WB_ENTRY(void, WB_UnlockCompilation(JNIEnv* env, jobject o))
803 MonitorLockerEx mo(Compilation_lock, Mutex::_no_safepoint_check_flag);
804 WhiteBox::compilation_locked = false;
805 mo.notify_all();
806 WB_END
807
808 void WhiteBox::sweeper_thread_entry(JavaThread* thread, TRAPS) {
809 guarantee(WhiteBoxAPI, "internal testing API :: WhiteBox has to be enabled");
810 {
811 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
812 NMethodSweeper::_should_sweep = true;
813 }
814 NMethodSweeper::possibly_sweep();
815 }
816
817 JavaThread* WhiteBox::create_sweeper_thread(TRAPS) {
818 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, THREAD);
819 instanceKlassHandle klass(THREAD, k);
820 instanceHandle thread_oop = klass->allocate_instance_handle(THREAD);
821
822 Handle name = java_lang_String::create_from_str("WB Sweeper thread", THREAD);
823
824 // Initialize thread_oop to put it into the system threadGroup
825 Handle thread_group(THREAD, Universe::system_thread_group());
826 JavaValue result(T_VOID);
827 JavaCalls::call_special(&result,
828 thread_oop,
829 klass,
830 vmSymbols::object_initializer_name(),
831 vmSymbols::threadgroup_string_void_signature(),
832 thread_group,
833 name,
834 THREAD);
835
836 KlassHandle group(THREAD, SystemDictionary::ThreadGroup_klass());
837 JavaCalls::call_special(&result,
838 thread_group,
839 group,
840 vmSymbols::add_method_name(),
841 vmSymbols::thread_void_signature(),
842 thread_oop, // ARG 1
843 THREAD);
844
845 {
846 MutexLocker mu(Threads_lock);
847
848 // create sweeper thread w/ custom entry -- one iteration instead of loop
849 CodeCacheSweeperThread* sweeper_thread = new CodeCacheSweeperThread();
850 sweeper_thread->set_entry_point(&WhiteBox::sweeper_thread_entry);
851
852 // check that thread and osthread were created
853 if (sweeper_thread == NULL || sweeper_thread->osthread() == NULL) {
854 vm_exit_during_initialization("java.lang.OutOfMemoryError",
855 os::native_thread_creation_failed_msg());
856 }
857
858 java_lang_Thread::set_thread(thread_oop(), sweeper_thread);
859 // inherit daemon property from current thread
860 if (java_lang_Thread::is_daemon(JavaThread::current()->threadObj())) {
861 java_lang_Thread::set_daemon(thread_oop());
862 }
863
864 // Make sure that both the thread_oop is set and the thread is added to
865 // the threads list before a safepoint can happen. Otherwise, a GC may
866 // move the thread object without updating the oop.
867 sweeper_thread->set_threadObj(thread_oop());
868 Threads::add(sweeper_thread);
869 return sweeper_thread;
870 }
871 }
872
873 WB_ENTRY(jobject, WB_ForceNMethodSweep(JNIEnv* env, jobject o))
874 JavaThread* sweeper_thread = WhiteBox::create_sweeper_thread(Thread::current());
875 if (sweeper_thread == NULL) {
876 return NULL;
877 }
878 jobject result = JNIHandles::make_local(env, sweeper_thread->threadObj());
879 Thread::start(sweeper_thread);
880 return result;
881 WB_END
882
883 WB_ENTRY(jboolean, WB_IsInStringTable(JNIEnv* env, jobject o, jstring javaString))
884 ResourceMark rm(THREAD);
885 int len;
886 jchar* name = java_lang_String::as_unicode_string(JNIHandles::resolve(javaString), len, CHECK_false);
887 return (StringTable::lookup(name, len) != NULL);
888 WB_END
889
890 WB_ENTRY(void, WB_FullGC(JNIEnv* env, jobject o))
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