1 /* 2 * Copyright (c) 2021 Huawei Device Co., Ltd. 3 * Licensed under the Apache License, Version 2.0 (the "License"); 4 * you may not use this file except in compliance with the License. 5 * You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software 10 * distributed under the License is distributed on an "AS IS" BASIS, 11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 * See the License for the specific language governing permissions and 13 * limitations under the License. 14 */ 15 16 #include "runtime/mem/rendezvous.h" 17 18 #include "runtime/include/runtime.h" 19 #include "runtime/include/thread.h" 20 #include "runtime/include/panda_vm.h" 21 #include "runtime/thread_manager.h" 22 23 namespace panda { 24 SafepointBegin()25void Rendezvous::SafepointBegin() 26 { 27 ASSERT(!Locks::mutator_lock->HasLock()); 28 LOG(DEBUG, GC) << "Rendezvous: SafepointBegin"; 29 // Suspend all threads 30 Thread::GetCurrent()->GetVM()->GetThreadManager()->SuspendAllThreads(); 31 // Acquire write MutatorLock 32 Locks::mutator_lock->WriteLock(); 33 } 34 SafepointEnd()35void Rendezvous::SafepointEnd() 36 { 37 ASSERT(Locks::mutator_lock->HasLock()); 38 LOG(DEBUG, GC) << "Rendezvous: SafepointEnd"; 39 // Release write MutatorLock 40 Locks::mutator_lock->Unlock(); 41 // Resume all threads 42 Thread::GetCurrent()->GetVM()->GetThreadManager()->ResumeAllThreads(); 43 LOG(DEBUG, GC) << "Rendezvous: SafepointEnd exit"; 44 } 45 ScopedSuspendAllThreadsRunning(Rendezvous * rendezvous)46ScopedSuspendAllThreadsRunning::ScopedSuspendAllThreadsRunning(Rendezvous *rendezvous) : rendezvous_(rendezvous) 47 { 48 ASSERT(rendezvous_ != nullptr); 49 ASSERT(Locks::mutator_lock->HasLock()); 50 Locks::mutator_lock->Unlock(); 51 rendezvous_->SafepointBegin(); 52 } 53 ~ScopedSuspendAllThreadsRunning()54ScopedSuspendAllThreadsRunning::~ScopedSuspendAllThreadsRunning() 55 { 56 rendezvous_->SafepointEnd(); 57 Locks::mutator_lock->ReadLock(); 58 } 59 60 } // namespace panda 61