pthreads

问题 I use a c++ class that encapsulates a boost::asio::io_service . class IoService { public: static IoService& getInstance() { static IoService instance; return instance; } void start() { _ioServiceThread = std::thread(&IoService::run, this); } void stop() { _ioService.stop(); _ioServiceThread.join(); } void run() { _ioService.run(); } private: IoService(); ~IoService(); IoService(const IoService& old) = delete; IoService(const IoService&& old) = delete; IoService& operator=(const IoService& old

问题 I use a c++ class that encapsulates a boost::asio::io_service . class IoService { public: static IoService& getInstance() { static IoService instance; return instance; } void start() { _ioServiceThread = std::thread(&IoService::run, this); } void stop() { _ioService.stop(); _ioServiceThread.join(); } void run() { _ioService.run(); } private: IoService(); ~IoService(); IoService(const IoService& old) = delete; IoService(const IoService&& old) = delete; IoService& operator=(const IoService& old

问题 When I write code that uses, for example, std::promise , and I don't include the PThread library in GCC, I get an exception thrown rather than a linker error. For example: void product(std::promise<int> intPromise, int a, int b) { intPromise.set_value(a * b); } int main() { int a = 20; int b = 10; std::promise<int> prodPromise; std::future<int> prodResult = prodPromise.get_future(); product(std::move(prodPromise), a, b); std::cout << "20*10= " << prodResult.get() << std::endl; } If I compile

问题 UPDATE 1: This question has been updated to eliminate the multithreading, simplifying its scope. The original problem popen ed in the main thread, and pclose d the child process in a different thread. The problem being asked about is reproducible much more simply, by doing the popen and pclose in the same (main) thread. Update 2: With help from responders at How to check libc version?, I think I've identified that the libc being used is uClibc 0.9.30. The following code popen s a script in

问题 UPDATE 1: This question has been updated to eliminate the multithreading, simplifying its scope. The original problem popen ed in the main thread, and pclose d the child process in a different thread. The problem being asked about is reproducible much more simply, by doing the popen and pclose in the same (main) thread. Update 2: With help from responders at How to check libc version?, I think I've identified that the libc being used is uClibc 0.9.30. The following code popen s a script in

问题 I got sensor data of various types that needs to be processed at different stages. From what I have read around, the most efficent way is to split the tasks into threads. Each puts the processed data into the entry queue of the next thread. So basically, a pipeline. The data can be quite large (a few Mbs) so it needs to be copied out of the sensor buffer and then passed along to the threads that will modify it and pass it along. I am interested in understanding the best way to do the passing.

问题 I found an implementation for pthreads on Windows here, but I couldn't get it to work right. Can anyone help me to install pthreads ? Like where to put DLLs, .lib, and .h files? Also, as an environment I'm not using Visual Studio, but Codeblocks with Mingw. I usually develop on Linux, but this project has to be on Windows, and I've already got some code implemented using pthreads, so I don't want to use Windows Threads from 'windows.h'. 回答1: The .dll can go in any directory listed in your

问题 I found an implementation for pthreads on Windows here, but I couldn't get it to work right. Can anyone help me to install pthreads ? Like where to put DLLs, .lib, and .h files? Also, as an environment I'm not using Visual Studio, but Codeblocks with Mingw. I usually develop on Linux, but this project has to be on Windows, and I've already got some code implemented using pthreads, so I don't want to use Windows Threads from 'windows.h'. 回答1: The .dll can go in any directory listed in your

问题 Is there a way for ps (or similar tool) to display the pthread's name? I wrote the following simple program: // th_name.c #include <stdio.h> #include <pthread.h> void * f1() { printf("f1 : Starting sleep\n"); sleep(30); printf("f1 : Done sleep\n"); } int main() { pthread_t f1_thread; pthread_create(&f1_thread, NULL, f1, NULL); pthread_setname_np(f1_thread, "f1_thread"); printf("Main : Starting sleep\n"); sleep(40); printf("Main : Done sleep\n"); return 0; } Is there a command/utility (like ps

问题 I am learning the std::promise and std::future in C++. I wrote one simple program to calculate the multiplication of two numbers. void product(std::promise<int> intPromise, int a, int b) { intPromise.set_value(a * b); } int main() { int a = 20; int b = 10; std::promise<int> prodPromise; std::future<int> prodResult = prodPromise.get_future(); // std::thread t{product, std::move(prodPromise), a, b}; product(std::move(prodPromise), a, b); std::cout << "20*10= " << prodResult.get() << std::endl;