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 "ecmascript/dfx/vm_thread_control.h" 17 18 namespace panda::ecmascript { 19 constexpr int32_t TIME_OUT_MS = 1500; 20 NotifyVMThreadSuspension()21bool VmThreadControl::NotifyVMThreadSuspension() // block caller thread 22 { 23 if (VMNeedSuspension()) { // only enable one thread to post suspension 24 return false; 25 } 26 SetVMNeedSuspension(true); 27 thread_->SetCheckSafePointStatus(); 28 LockHolder lock(vmThreadSuspensionMutex_); 29 while (!IsSuspended()) { 30 if (vmThreadNeedSuspensionCV_.TimedWait(&vmThreadSuspensionMutex_, TIME_OUT_MS)) { 31 SetVMNeedSuspension(false); 32 thread_->ResetCheckSafePointStatus(); 33 return false; 34 } 35 } 36 return true; 37 } 38 RequestTerminateExecution()39void VmThreadControl::RequestTerminateExecution() 40 { 41 SetTerminationRequest(true); 42 thread_->SetCheckSafePointStatus(); 43 } 44 SetVMNeedSuspension(bool flag)45void VmThreadControl::SetVMNeedSuspension(bool flag) 46 { 47 thread_->SetVMNeedSuspension(flag); 48 } 49 VMNeedSuspension() const50bool VmThreadControl::VMNeedSuspension() const 51 { 52 return thread_->VMNeedSuspension(); 53 } 54 SetTerminationRequest(bool flag)55void VmThreadControl::SetTerminationRequest(bool flag) 56 { 57 thread_->SetTerminationRequest(flag); 58 } 59 SetVMSuspended(bool flag)60void VmThreadControl::SetVMSuspended(bool flag) 61 { 62 thread_->SetVMSuspended(flag); 63 } 64 IsSuspended() const65bool VmThreadControl::IsSuspended() const 66 { 67 return thread_->IsVMSuspended(); 68 } 69 SuspendVM()70void VmThreadControl::SuspendVM() // block vm thread 71 { 72 LockHolder lock(vmThreadSuspensionMutex_); 73 SetVMSuspended(true); 74 vmThreadNeedSuspensionCV_.Signal(); // wake up the thread who needs suspend vmthread 75 while (VMNeedSuspension()) { 76 vmThreadHasSuspendedCV_.Wait(&vmThreadSuspensionMutex_); 77 } 78 SetVMSuspended(false); 79 } 80 ResumeVM()81void VmThreadControl::ResumeVM() 82 { 83 LockHolder lock(vmThreadSuspensionMutex_); 84 SetVMNeedSuspension(false); 85 vmThreadHasSuspendedCV_.Signal(); 86 } 87 } // namespace panda::ecmascript