boost-thread

问题 I have NUM_THREADS threads, with the following codes in my thread: /* Calculate some_value; */ //Critical section to accummulate all thresholds { boost::mutex::scoped_lock lock(write_mutex); T += some_value; num_threads++; if (num_threads == NUM_THREADS){ T = T/NUM_THREADS; READY = true; cond.notify_all(); num_threads = 0; } } //Wait for average threshold to be ready if (!READY) { boost::unique_lock<boost::mutex> lock(wait_mutex); while (!READY){ cond.wait(lock); } } //End critical section /*

问题 I'm trying to create producer/consumer using Boost.Fibers. Looks like using channels from this example is the right thing to do. The example have to be changed slightly since I want to signal completion using promise/future . So I wrote some naive code to do no work, just signal the completion. struct fiber_worker { fiber_worker() { wthread = std::thread([self{this}]() { for (int i = 0; i < 4; ++i) { boost::fibers::fiber{ [self]() { task tsk; while (boost::fibers::channel_op_status::closed !=

问题 In a class, I want to use a mutex over a function like this void Agent::notify(Packet& packet, Peer peer) { boost::mutex::scoped_lock lock(mutex_); ... } No problem at the compilation process. But when I execute the program, boost always fail at this line saying : terminate called after throwing an instance of 'boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<boost::lock_error> >' what(): boost: mutex lock failed in pthread_mutex_lock: Invalid argument Abandon

问题 Debugging in gdb is not convenient for me so I enjoy the nice debugging interface that code::blocks offers. Now that I have moved my project into an area where those flags are required (the ones in the title, of course), I find that I can't compile on code::blocks anymore :/. 回答1: Hi everyone I figured out how to add the -lrt. Since -lrt is passed to the linker and not the compiler you can go to Settings->Compiler and Debugger->linker options then press add and after doing a "locate lrt" I

问题 I'm using the C++ boost::thread library, which in my case means I'm using pthreads. Officially, a mutex must be unlocked from the same thread which locks it, and I want the effect of being able to lock in one thread and then unlock in another. There are many ways to accomplish this. One possibility would be to write a new mutex class which allows this behavior. For example: class inter_thread_mutex{ bool locked; boost::mutex mx; boost::condition_variable cv; public: void lock(){ boost::unique

问题 I am trying to use boost::asio async client example with a simple Qt GUI like: A little snippet from my app: The button click SLOT: void RestWidget::restGetCall() { networkService ntwkSer("www.boost.org","80"); connect(&ntwkSer, SIGNAL(responseReady(std::string)), this, SLOT(showResponse(std::string))); ntwkSer.get("/LICENSE_1_0.txt"); } The networkService class is just a wrapper of the above linked boost sample code.Its derived from QObject class for signal,slot mechanism. void

问题 The boost threading library has an abstraction for thread specific (local) storage. I have skimmed over the source code and it seems that the TSS functionality can be used in an application with any existing thread regardless of weather it was created from boost::thread --i.e., this implies that certain callbacks are registered with the kernel to hook in a callback function that may call the destructor of any TSS objects when the thread or process is going out of scope. I have found these

问题 I'm implementing a message passing algorithm. The messages propagate through the nodes of the graph, blocking until they have have received enough information (from other neighbours) to send a message. The algorithm is easy to write if I put each message in its own thread and use a boost::condition to pause the thread until all the required information is available. I create many thousands of threads, but mostly only a few are active at any time. This seems to work pretty well. My problem is,

问题 I was trying to run a small test program on Xcode (4.2) using C++ after encountering error in my project. #include <boost/thread.hpp> #include <boost/bind.hpp> int main (int argc, const char * argv[]) { boost::thread_group tg; return 0; } But the whole program fails to build, outputting error: Undefined symbols for architecture x86_64: "boost::thread::~thread()", referenced from: boost::thread_group::~thread_group()in main.o ld: symbol(s) not found for architecture x86_64 collect2: ld

问题 I am trying to use boost::shared_mutex to implement a multiple-reader / single-writer mutex. My question is fairly simple, is it possible for a thread to gain reader access to a shared_mutex, when another thread tries to lock that shared_mutex for writing? For example, I have 10 threads, only one of them can write, thread 1 has a shared_lock on that shared_mutex and tries to read something thread 2 has a shared_lock on that shared_mutex and tries to read something thread 3 has a unique_lock