< prev index next >
src/hotspot/share/runtime/safepointMechanism.inline.hpp
Print this page
rev 47413 : Introduce SafepointMechanism
rev 47415 : Add Thread Local handshakes and thread local polling
@@ -25,23 +25,68 @@
#ifndef SHARE_VM_RUNTIME_SAFEPOINTMECHANISM_INLINE_HPP
#define SHARE_VM_RUNTIME_SAFEPOINTMECHANISM_INLINE_HPP
#include "runtime/safepointMechanism.hpp"
#include "runtime/safepoint.hpp"
-#include "runtime/thread.hpp"
+#include "runtime/thread.inline.hpp"
+bool SafepointMechanism::local_poll_armed(JavaThread* thread) {
+ const intptr_t poll_word = reinterpret_cast<intptr_t>(thread->get_polling_page());
+ return mask_bits_are_true(poll_word, poll_bit());
+}
bool SafepointMechanism::global_poll() {
return SafepointSynchronize::do_call_back();
}
-bool SafepointMechanism::poll() {
+bool SafepointMechanism::local_poll(Thread* thread) {
+ // Mutexes can be taken but none JavaThread. These cannot have handshakes
+ // operation but they must stop for safepoints.
+ if (thread->is_Java_thread()) {
+ return local_poll_armed((JavaThread*)thread);
+ } else {
+ return global_poll();
+ }
+}
+
+bool SafepointMechanism::poll(Thread* thread) {
+ if (uses_thread_local_poll()) {
+ return local_poll(thread);
+ } else {
return global_poll();
+ }
+}
+
+void SafepointMechanism::block_if_requested_local_poll(JavaThread *thread) {
+ bool armed = local_poll_armed(thread); // load acquire, polling page -> op / global state
+ if(armed) {
+ // We could be armed for either a handshake operation or a safepoint
+ if (thread->has_handshake()) {
+ thread->handshake_process_by_self();
+ } else {
+ if (global_poll()) {
+ SafepointSynchronize::block(thread);
+ }
+ }
+ }
}
void SafepointMechanism::block_if_requested(JavaThread *thread) {
+ if (uses_thread_local_poll()) {
+ block_if_requested_local_poll(thread);
+ } else {
+ // If we don't have per thread poll this could a handshake or a safepoint
if (global_poll()) {
SafepointSynchronize::block(thread);
}
+ }
+}
+
+void SafepointMechanism::arm_local_poll(JavaThread* thread) {
+ thread->set_polling_page(poll_armed_value());
+}
+
+void SafepointMechanism::disarm_local_poll(JavaThread* thread) {
+ thread->set_polling_page(poll_disarmed_value());
}
#endif // SHARE_VM_RUNTIME_SAFEPOINTMECHANISM_INLINE_HPP
< prev index next >