1 // The MIT License (MIT) 2 // 3 // Copyright (c) 2015 Sergey Makeev, Vadim Slyusarev 4 // 5 // Permission is hereby granted, free of charge, to any person obtaining a copy 6 // of this software and associated documentation files (the "Software"), to deal 7 // in the Software without restriction, including without limitation the rights 8 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 9 // copies of the Software, and to permit persons to whom the Software is 10 // furnished to do so, subject to the following conditions: 11 // 12 // The above copyright notice and this permission notice shall be included in 13 // all copies or substantial portions of the Software. 14 // 15 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 18 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 20 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 21 // THE SOFTWARE. 22 23 #include <MTScheduler.h> 24 25 namespace MT 26 { 27 FiberContext::FiberContext() 28 : threadContext(nullptr) 29 , taskStatus(FiberTaskStatus::UNKNOWN) 30 , childrenFibersCount(0) 31 , parentFiber(nullptr) 32 { 33 } 34 35 void FiberContext::SetStatus(FiberTaskStatus::Type _taskStatus) 36 { 37 MT_ASSERT(threadContext, "Sanity check failed"); 38 MT_ASSERT(threadContext->thread.IsCurrentThread(), "You can change task status only from owner thread"); 39 taskStatus = _taskStatus; 40 } 41 42 FiberTaskStatus::Type FiberContext::GetStatus() const 43 { 44 return taskStatus; 45 } 46 47 void FiberContext::SetThreadContext(internal::ThreadContext * _threadContext) 48 { 49 if (_threadContext) 50 { 51 _threadContext->lastActiveFiberContext = this; 52 } 53 54 threadContext = _threadContext; 55 } 56 57 internal::ThreadContext* FiberContext::GetThreadContext() 58 { 59 return threadContext; 60 } 61 62 void FiberContext::Reset() 63 { 64 MT_ASSERT(childrenFibersCount.Get() == 0, "Can't release fiber with active children fibers"); 65 currentTask = internal::TaskDesc(); 66 parentFiber = nullptr; 67 threadContext = nullptr; 68 } 69 70 void FiberContext::WaitGroupAndYield(TaskGroup group) 71 { 72 MT_ASSERT(threadContext, "Sanity check failed!"); 73 MT_ASSERT(threadContext->taskScheduler->IsWorkerThread(), "Can't use WaitGroupAndYield outside Task. Use TaskScheduler.WaitGroup() instead."); 74 MT_ASSERT(threadContext->thread.IsCurrentThread(), "Thread context sanity check failed"); 75 76 MT_VERIFY(group != currentGroup, "Can't wait the same group. Deadlock detected!", return); 77 MT_VERIFY(group.IsValid(), "Invalid group!", return); 78 79 TaskScheduler::TaskGroupDescription & groupDesc = threadContext->taskScheduler->GetGroupDesc(group); 80 81 ConcurrentQueueLIFO<FiberContext*> & groupQueue = groupDesc.GetWaitQueue(); 82 83 // Change status 84 taskStatus = FiberTaskStatus::AWAITING_GROUP; 85 86 // Add current fiber to awaiting queue 87 groupQueue.Push(this); 88 89 Fiber & schedulerFiber = threadContext->schedulerFiber; 90 91 #ifdef MT_INSTRUMENTED_BUILD 92 threadContext->NotifyTaskYielded(currentTask); 93 #endif 94 95 // Yielding, so reset thread context 96 threadContext = nullptr; 97 98 //switch to scheduler 99 Fiber::SwitchTo(fiber, schedulerFiber); 100 } 101 102 void FiberContext::RunSubtasksAndYieldImpl(ArrayView<internal::TaskBucket>& buckets) 103 { 104 MT_ASSERT(threadContext, "Sanity check failed!"); 105 MT_ASSERT(threadContext->taskScheduler->IsWorkerThread(), "Can't use RunSubtasksAndYield outside Task. Use TaskScheduler.WaitGroup() instead."); 106 MT_ASSERT(threadContext->thread.IsCurrentThread(), "Thread context sanity check failed"); 107 108 // add to scheduler 109 threadContext->taskScheduler->RunTasksImpl(buckets, this, false); 110 111 // 112 MT_ASSERT(threadContext->thread.IsCurrentThread(), "Thread context sanity check failed"); 113 114 // Change status 115 taskStatus = FiberTaskStatus::AWAITING_CHILD; 116 117 Fiber & schedulerFiber = threadContext->schedulerFiber; 118 119 #ifdef MT_INSTRUMENTED_BUILD 120 threadContext->NotifyTaskYielded(currentTask); 121 #endif 122 123 // Yielding, so reset thread context 124 threadContext = nullptr; 125 126 //switch to scheduler 127 Fiber::SwitchTo(fiber, schedulerFiber); 128 } 129 130 131 } 132