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.Load() == 0, "Can't release fiber with active children fibers"); 65 currentTask = internal::TaskDesc(); 66 parentFiber = nullptr; 67 threadContext = nullptr; 68 stackRequirements = StackRequirements::INVALID; 69 } 70 71 void FiberContext::WaitGroupAndYield(TaskGroup group) 72 { 73 MT_ASSERT(threadContext, "Sanity check failed!"); 74 MT_ASSERT(threadContext->taskScheduler->IsWorkerThread(), "Can't use WaitGroupAndYield outside Task. Use TaskScheduler.WaitGroup() instead."); 75 MT_ASSERT(threadContext->thread.IsCurrentThread(), "Thread context sanity check failed"); 76 77 MT_VERIFY(group != currentGroup, "Can't wait the same group. Deadlock detected!", return); 78 MT_VERIFY(group.IsValid(), "Invalid group!", return); 79 80 TaskScheduler::TaskGroupDescription & groupDesc = threadContext->taskScheduler->GetGroupDesc(group); 81 82 ConcurrentQueueLIFO<FiberContext*> & groupQueue = groupDesc.GetWaitQueue(); 83 84 // Change status 85 taskStatus = FiberTaskStatus::AWAITING_GROUP; 86 87 // Add current fiber to awaiting queue 88 groupQueue.Push(this); 89 90 Fiber & schedulerFiber = threadContext->schedulerFiber; 91 92 #ifdef MT_INSTRUMENTED_BUILD 93 threadContext->NotifyTaskYielded(currentTask); 94 #endif 95 96 // Yielding, so reset thread context 97 threadContext = nullptr; 98 99 //switch to scheduler 100 Fiber::SwitchTo(fiber, schedulerFiber); 101 } 102 103 void FiberContext::RunSubtasksAndYieldImpl(ArrayView<internal::TaskBucket>& buckets) 104 { 105 MT_ASSERT(threadContext, "Sanity check failed!"); 106 MT_ASSERT(threadContext->taskScheduler->IsWorkerThread(), "Can't use RunSubtasksAndYield outside Task. Use TaskScheduler.WaitGroup() instead."); 107 MT_ASSERT(threadContext->thread.IsCurrentThread(), "Thread context sanity check failed"); 108 109 // add to scheduler 110 threadContext->taskScheduler->RunTasksImpl(buckets, this, false); 111 112 // 113 MT_ASSERT(threadContext->thread.IsCurrentThread(), "Thread context sanity check failed"); 114 115 // Change status 116 taskStatus = FiberTaskStatus::AWAITING_CHILD; 117 118 Fiber & schedulerFiber = threadContext->schedulerFiber; 119 120 #ifdef MT_INSTRUMENTED_BUILD 121 threadContext->NotifyTaskYielded(currentTask); 122 #endif 123 124 // Yielding, so reset thread context 125 threadContext = nullptr; 126 127 //switch to scheduler 128 Fiber::SwitchTo(fiber, schedulerFiber); 129 } 130 131 132 void FiberContext::RunAsync(TaskGroup taskGroup, const TaskHandle* taskHandleArray, uint32 taskHandleCount) 133 { 134 MT_ASSERT(threadContext, "ThreadContext is nullptr"); 135 MT_ASSERT(threadContext->taskScheduler->IsWorkerThread(), "Can't use RunAsync outside Task. Use TaskScheduler.RunAsync() instead."); 136 137 TaskScheduler& scheduler = *(threadContext->taskScheduler); 138 139 ArrayView<internal::GroupedTask> buffer(threadContext->descBuffer, taskHandleCount); 140 141 uint32 bucketCount = MT::Min((uint32)scheduler.GetWorkersCount(), taskHandleCount); 142 ArrayView<internal::TaskBucket> buckets(MT_ALLOCATE_ON_STACK(sizeof(internal::TaskBucket) * bucketCount), bucketCount); 143 144 internal::DistibuteDescriptions(taskGroup, taskHandleArray, buffer, buckets); 145 scheduler.RunTasksImpl(buckets, nullptr, false); 146 } 147 148 149 void FiberContext::RunSubtasksAndYield(TaskGroup taskGroup, const TaskHandle* taskHandleArray, uint32 taskHandleCount) 150 { 151 MT_ASSERT(threadContext, "ThreadContext is nullptr"); 152 MT_ASSERT(taskHandleCount < internal::TASK_BUFFER_CAPACITY, "Buffer overrun!"); 153 154 TaskScheduler& scheduler = *(threadContext->taskScheduler); 155 156 ArrayView<internal::GroupedTask> buffer(threadContext->descBuffer, taskHandleCount); 157 158 uint32 bucketCount = MT::Min((uint32)scheduler.GetWorkersCount(), taskHandleCount); 159 ArrayView<internal::TaskBucket> buckets(MT_ALLOCATE_ON_STACK(sizeof(internal::TaskBucket) * bucketCount), bucketCount); 160 161 internal::DistibuteDescriptions(taskGroup, taskHandleArray, buffer, buckets); 162 RunSubtasksAndYieldImpl(buckets); 163 } 164 165 166 167 } 168