boost-thread

问题 I have a multithreaded server application that needs mutex locks over some shared memory. The shared memory are basically sTL maps etc. Much of the time I'm just reading from the map. But, I also need to occasionally add to it. e.g. typedef std::map MessageMap; MessageMap msgmap; boost:shared_mutex access_; void ProcessMessage(Message* message) { // Access message... read some stuff from it message->... UUID id = message->GetSessionID(); // Need to obtain a lock here. (shared lock? multiple

问题 I have a multithreaded server application that needs mutex locks over some shared memory. The shared memory are basically sTL maps etc. Much of the time I'm just reading from the map. But, I also need to occasionally add to it. e.g. typedef std::map MessageMap; MessageMap msgmap; boost:shared_mutex access_; void ProcessMessage(Message* message) { // Access message... read some stuff from it message->... UUID id = message->GetSessionID(); // Need to obtain a lock here. (shared lock? multiple

问题 I have a class such as : class MyStreamReader { public: MyStreamReader(MyPramameter myPram) {.....} ~MyStreamReader() {} DWORD WINAPI ReaderThread(LPVOID *lpdwThreadParam ) { //.... } }; and i want to call ReaderThread with WinAPI CreateThread . But CreateThread wants ReaderThread function wants a static function. In some forms it is said that this is possible with boost library such as : CreateThread(NULL, 0, boost::bind(&MyStreamReader::ReaderThread,this), (void*)&myParameterObject), 0,

问题 I'm working on a little threading library and have run into a problem. boost::condition_variable.wait() works perfectly, however boost::condition_variable.timed_wait() returns immediately, it doesn't time out. The documentation says it should only return once the timeout has passed or it's been notified. It's a three second wait before notification and I've tried both 10 second and 100 second timouts, so it should return after 3 seconds. EDIT: boost::condition_variable waitCondition; boost:

问题 I have an application that uses boost logging. During shutdown, it gets an access violation on a null pointer access. When I step through the code to the point of failure, it appears that the boost::log dll is being de-allocated and then boost::thread code tries to access the memory that was once occupied by the log dll. I am not using any boost threads in my own code, and so assume the boost-thread dll is used by boost log. To ensure all sinks are destroyed prior to shutdown, I am calling:

问题 There is a widely known way of locking multiple locks, which relies on choosing fixed linear ordering and aquiring locks according to this ordering. That was proposed, for example, in the answer for "Acquire a lock on two mutexes and avoid deadlock". Especially, the solution based on address comparison seems to be quite elegant and obvious . When I tried to check how it is actually implemented, I've found, to my surprise, that this solution in not widely used. To quote the Kernel Docs -

问题 There is a widely known way of locking multiple locks, which relies on choosing fixed linear ordering and aquiring locks according to this ordering. That was proposed, for example, in the answer for "Acquire a lock on two mutexes and avoid deadlock". Especially, the solution based on address comparison seems to be quite elegant and obvious . When I tried to check how it is actually implemented, I've found, to my surprise, that this solution in not widely used. To quote the Kernel Docs -

问题 This is the code to create a thread_group and execute all threads in parallel: boost::thread_group group; for (int i = 0; i < 15; ++i) group.create_thread(aFunctionToExecute); group.join_all(); This code will execute all threads at once. What I want to do is to execute them all but 4 maximum in parallel. When on is terminated, another one is executed until there are no more to execute. 回答1: Another, more efficient solution would be to have each thread callback to the primary thread when they

问题 This is the code to create a thread_group and execute all threads in parallel: boost::thread_group group; for (int i = 0; i < 15; ++i) group.create_thread(aFunctionToExecute); group.join_all(); This code will execute all threads at once. What I want to do is to execute them all but 4 maximum in parallel. When on is terminated, another one is executed until there are no more to execute. 回答1: Another, more efficient solution would be to have each thread callback to the primary thread when they

问题 I am trying to compile my program but it wouldn't link at all. I have specified the path to the boost lib files and the linker still complain. Here's the linking error I got: 1>Edproj.obj : error LNK2001: unresolved external symbol "class boost::system::error_category const & __cdecl boost::system::system_category(void)" (?system_category@system@boost@@YAABVerror_category@12@XZ) 1>Edproj.obj : error LNK2001: unresolved external symbol "class boost::system::error_category const & __cdecl boost