os::signal_init()
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//Linux版(jdk7/hotspot/src/share/vm/runtime/os.cpp) void os::signal_init() { if (!ReduceSignalUsage) { // Setup JavaThread for processing signals EXCEPTION_MARK; klassOop k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK); instanceKlassHandle klass (THREAD, k); instanceHandle thread_oop = klass->allocate_instance_handle(CHECK); const char thread_name[] = "Signal Dispatcher"; Handle string = java_lang_String::create_from_str(thread_name, CHECK); // Initialize thread_oop to put it into the system threadGroup Handle thread_group (THREAD, Universe::system_thread_group()); JavaValue result(T_VOID); JavaCalls::call_special(&result, thread_oop, klass, vmSymbols::object_initializer_name(), vmSymbols::threadgroup_string_void_signature(), thread_group, string, CHECK); KlassHandle group(THREAD, SystemDictionary::ThreadGroup_klass()); JavaCalls::call_special(&result, thread_group, group, vmSymbols::add_method_name(), vmSymbols::thread_void_signature(), thread_oop, // ARG 1 CHECK); os::signal_init_pd(); { MutexLocker mu(Threads_lock); JavaThread* signal_thread = new JavaThread(&signal_thread_entry); // At this point it may be possible that no osthread was created for the // JavaThread due to lack of memory. We would have to throw an exception // in that case. However, since this must work and we do not allow // exceptions anyway, check and abort if this fails. if (signal_thread == NULL || signal_thread->osthread() == NULL) { vm_exit_during_initialization("java.lang.OutOfMemoryError", "unable to create new native thread"); } java_lang_Thread::set_thread(thread_oop(), signal_thread); java_lang_Thread::set_priority(thread_oop(), NearMaxPriority); java_lang_Thread::set_daemon(thread_oop()); signal_thread->set_threadObj(thread_oop()); Threads::add(signal_thread); Thread::start(signal_thread); } // Handle ^BREAK os::signal(SIGBREAK, os::user_handler()); } }