+/*\r
+* copyright (c) 2010 Sveriges Television AB <info@casparcg.com>\r
+*\r
+* This file is part of CasparCG.\r
+*\r
+* CasparCG is free software: you can redistribute it and/or modify\r
+* it under the terms of the GNU General Public License as published by\r
+* the Free Software Foundation, either version 3 of the License, or\r
+* (at your option) any later version.\r
+*\r
+* CasparCG is distributed in the hope that it will be useful,\r
+* but WITHOUT ANY WARRANTY; without even the implied warranty of\r
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\r
+* GNU General Public License for more details.\r
+\r
+* You should have received a copy of the GNU General Public License\r
+* along with CasparCG. If not, see <http://www.gnu.org/licenses/>.\r
+*\r
+*/\r
#pragma once\r
\r
-#include "../exception/exceptions.h"\r
#include "../exception/win32_exception.h"\r
-\r
-#include <boost/thread.hpp>\r
+#include "../utility/string.h"\r
+#include "../utility/move_on_copy.h"\r
+#include "../log/log.h"\r
\r
#include <tbb/atomic.h>\r
#include <tbb/concurrent_queue.h>\r
\r
+#include <boost/thread.hpp>\r
+#include <boost/optional.hpp>\r
+#include <boost/noncopyable.hpp>\r
+\r
#include <functional>\r
\r
-namespace caspar { namespace common {\r
+namespace caspar {\r
+\r
+namespace detail {\r
\r
-class executor\r
+typedef struct tagTHREADNAME_INFO\r
{\r
-public:\r
- explicit executor(const std::function<void()>& run_func = nullptr)\r
+ DWORD dwType; // must be 0x1000\r
+ LPCSTR szName; // pointer to name (in user addr space)\r
+ DWORD dwThreadID; // thread ID (-1=caller thread)\r
+ DWORD dwFlags; // reserved for future use, must be zero\r
+} THREADNAME_INFO;\r
+\r
+inline void SetThreadName(DWORD dwThreadID, LPCSTR szThreadName)\r
+{\r
+ THREADNAME_INFO info;\r
{\r
- is_running_ = false;\r
- run_func_ = run_func != nullptr ? run_func : [=]{run();};\r
+ info.dwType = 0x1000;\r
+ info.szName = szThreadName;\r
+ info.dwThreadID = dwThreadID;\r
+ info.dwFlags = 0;\r
}\r
-\r
- virtual ~executor()\r
+ __try\r
{\r
- stop();\r
+ RaiseException( 0x406D1388, 0, sizeof(info)/sizeof(DWORD), (DWORD*)&info );\r
}\r
+ __except (EXCEPTION_CONTINUE_EXECUTION){} \r
+}\r
\r
- void start()\r
- {\r
- if(is_running_.fetch_and_store(true))\r
- return;\r
- thread_ = boost::thread(run_func_);\r
+}\r
+\r
+enum task_priority\r
+{\r
+ high_priority,\r
+ normal_priority,\r
+ priority_count\r
+};\r
+\r
+enum thread_priority\r
+{\r
+ high_priority_class,\r
+ above_normal_priority_class,\r
+ normal_priority_class,\r
+ below_normal_priority_class\r
+};\r
+\r
+class executor : boost::noncopyable\r
+{\r
+ const std::string name_;\r
+ boost::thread thread_;\r
+ tbb::atomic<bool> is_running_;\r
+ \r
+ typedef tbb::concurrent_bounded_queue<std::function<void()>> function_queue;\r
+ function_queue execution_queue_[priority_count];\r
+ \r
+ template<typename Func>\r
+ auto create_task(Func&& func) -> boost::packaged_task<decltype(func())> // noexcept\r
+ { \r
+ typedef boost::packaged_task<decltype(func())> task_type;\r
+ \r
+ auto task = task_type(std::forward<Func>(func));\r
+ \r
+ task.set_wait_callback(std::function<void(task_type&)>([=](task_type& my_task) // The std::function wrapper is required in order to add ::result_type to functor class.\r
+ {\r
+ try\r
+ {\r
+ if(boost::this_thread::get_id() == thread_.get_id()) // Avoids potential deadlock.\r
+ my_task();\r
+ }\r
+ catch(boost::task_already_started&){}\r
+ }));\r
+ \r
+ return std::move(task);\r
}\r
\r
- bool is_running() const\r
+public:\r
+ \r
+ explicit executor(const std::wstring& name) : name_(narrow(name)) // noexcept\r
{\r
- return is_running_;\r
+ thread_ = boost::thread([this]{run();});\r
+ is_running_ = true;\r
}\r
\r
- void stop()\r
+ virtual ~executor() // noexcept\r
{\r
- if(is_running_.fetch_and_store(false))\r
- {\r
- execution_queue_.clear();\r
- execution_queue_.push([](){}); \r
- }\r
- thread_.join();\r
+ stop();\r
+ join();\r
}\r
\r
- void execute()\r
+ void set_capacity(size_t capacity) // noexcept\r
{\r
- std::function<void()> func;\r
- execution_queue_.pop(func); \r
- func();\r
+ execution_queue_[normal_priority].set_capacity(capacity);\r
}\r
\r
- bool try_execute()\r
+ void set_priority_class(thread_priority p)\r
{\r
- std::function<void()> func;\r
- if(execution_queue_.try_pop(func))\r
- func();\r
-\r
- return func != nullptr;\r
+ begin_invoke([=]\r
+ {\r
+ if(p == high_priority_class)\r
+ SetThreadPriority(GetCurrentThread(), HIGH_PRIORITY_CLASS);\r
+ if(p == above_normal_priority_class)\r
+ SetThreadPriority(GetCurrentThread(), ABOVE_NORMAL_PRIORITY_CLASS);\r
+ else if(p == normal_priority_class)\r
+ SetThreadPriority(GetCurrentThread(), NORMAL_PRIORITY_CLASS);\r
+ else if(p == below_normal_priority_class)\r
+ SetThreadPriority(GetCurrentThread(), BELOW_NORMAL_PRIORITY_CLASS);\r
+ });\r
}\r
-\r
- void clear()\r
+ \r
+ void stop() // noexcept\r
{\r
- execution_queue_.clear();\r
+ is_running_ = false; \r
+ execution_queue_[normal_priority].try_push([]{}); // Wake the execution thread.\r
}\r
\r
- template<typename Func>\r
- void enqueue(Func&& func)\r
+ void wait() // noexcept\r
{\r
- execution_queue_.push([=]{try{func();}catch(...){CASPAR_LOG_CURRENT_EXCEPTION();}});\r
+ invoke([]{});\r
}\r
\r
+ void join()\r
+ {\r
+ if(boost::this_thread::get_id() != thread_.get_id())\r
+ thread_.join();\r
+ }\r
+ \r
template<typename Func>\r
- auto begin_invoke(Func&& func) -> boost::unique_future<decltype(func())>\r
+ auto begin_invoke(Func&& func, task_priority priority = normal_priority) -> boost::unique_future<decltype(func())> // noexcept\r
{ \r
- typedef decltype(func()) result_type; \r
- \r
- auto task = std::make_shared<boost::packaged_task<result_type>>(std::forward<Func>(func)); \r
- auto future = task->get_future();\r
- \r
- if(boost::this_thread::get_id() != thread_.get_id())\r
- execution_queue_.push([=]{(*task)();});\r
- else\r
- (*task)();\r
+ // Create a move on copy adaptor to avoid copying the functor into the queue, tbb::concurrent_queue does not support move semantics.\r
+ auto task_adaptor = make_move_on_copy(create_task(func));\r
+\r
+ auto future = task_adaptor.value.get_future();\r
\r
+ execution_queue_[priority].push([=]\r
+ {\r
+ try{task_adaptor.value();}\r
+ catch(boost::task_already_started&){}\r
+ catch(...){CASPAR_LOG_CURRENT_EXCEPTION();}\r
+ });\r
+\r
+ if(priority != normal_priority)\r
+ execution_queue_[normal_priority].push(nullptr);\r
+ \r
return std::move(future); \r
}\r
\r
template<typename Func>\r
- auto invoke(Func&& func) -> decltype(func())\r
+ auto invoke(Func&& func, task_priority prioriy = normal_priority) -> decltype(func()) // noexcept\r
{\r
- return begin_invoke(std::forward<Func>(func)).get();\r
+ if(boost::this_thread::get_id() == thread_.get_id()) // Avoids potential deadlock.\r
+ return func();\r
+ \r
+ return begin_invoke(std::forward<Func>(func), prioriy).get();\r
}\r
-\r
- void set_capacity(size_t capacity)\r
+ \r
+ void yield() // noexcept\r
{\r
- execution_queue_.set_capacity(capacity);\r
+ if(boost::this_thread::get_id() != thread_.get_id()) // Only yield when calling from execution thread.\r
+ return;\r
+\r
+ std::function<void()> func;\r
+ while(execution_queue_[high_priority].try_pop(func))\r
+ {\r
+ if(func)\r
+ func();\r
+ } \r
}\r
\r
+ function_queue::size_type capacity() const /*noexcept*/ { return execution_queue_[normal_priority].capacity(); }\r
+ function_queue::size_type size() const /*noexcept*/ { return execution_queue_[normal_priority].size(); }\r
+ bool empty() const /*noexcept*/ { return execution_queue_[normal_priority].empty(); }\r
+ bool is_running() const /*noexcept*/ { return is_running_; } \r
+ \r
private:\r
-\r
- virtual void run()\r
+ \r
+ void execute() // noexcept\r
{\r
- win32_exception::install_handler();\r
- while(is_running_)\r
- execute();\r
+ std::function<void()> func;\r
+ execution_queue_[normal_priority].pop(func); \r
+\r
+ yield();\r
+\r
+ if(func)\r
+ func();\r
}\r
\r
- std::function<void()> run_func_;\r
- boost::thread thread_;\r
- tbb::atomic<bool> is_running_;\r
- tbb::concurrent_bounded_queue<std::function<void()>> execution_queue_;\r
+ void run() // noexcept\r
+ {\r
+ win32_exception::install_handler(); \r
+ detail::SetThreadName(GetCurrentThreadId(), name_.c_str());\r
+ while(is_running_)\r
+ {\r
+ try\r
+ {\r
+ execute();\r
+ }\r
+ catch(...)\r
+ {\r
+ CASPAR_LOG_CURRENT_EXCEPTION();\r
+ }\r
+ }\r
+ } \r
};\r
\r
-}}
\ No newline at end of file
+}
\ No newline at end of file
projects / casparcg / blobdiff