multithreading

问题 I have this pretty straightforward piece of code that very rarely throws "System.ApplicationException : Object synchronization method was called from an unsynchronized block of code." when ReleaseMutex () is called. I logically analyzed the flow of the method and just cannot understand how/why this could happen. To my understanding, the ownership of mutex is guaranteed in this case: readonly string mutexKey; public Logger(string dbServer, string dbName) { this.mutexKey = ServiceManagerHelper

问题 The bounty expires tomorrow . Answers to this question are eligible for a +50 reputation bounty. Thomas Weller wants to draw more attention to this question. Given the attached LINQ-Pad snippet. It creates 8 tasks, executes for 500ms and draws a graph on when the threads were actually running. On a 4 core CPU it may look like this: Now, if I add a Thread.Sleep or a Task.Delay within the thread loops, I can visualize the clock of the windows system timer (~15ms): Now, there's also the

问题 The bounty expires tomorrow . Answers to this question are eligible for a +50 reputation bounty. Thomas Weller wants to draw more attention to this question. Given the attached LINQ-Pad snippet. It creates 8 tasks, executes for 500ms and draws a graph on when the threads were actually running. On a 4 core CPU it may look like this: Now, if I add a Thread.Sleep or a Task.Delay within the thread loops, I can visualize the clock of the windows system timer (~15ms): Now, there's also the

问题 It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center. Closed 9 years ago . Let's say I have a thread pool that has 5 child threads. And they are calling a function called "functionA()" How do I make the function to be thread safe? Also if those 5 threads are called at the same time then

问题 It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center. Closed 9 years ago . Let's say I have a thread pool that has 5 child threads. And they are calling a function called "functionA()" How do I make the function to be thread safe? Also if those 5 threads are called at the same time then

问题 I have created a program which creates a Mandelbrot set. Now I'm trying to make it multithreaded. // mandelbrot.cpp // compile with: g++ -std=c++11 mandelbrot.cpp -o mandelbrot // view output with: eog mandelbrot.ppm #include <fstream> #include <complex> // if you make use of complex number facilities in C++ #include <iostream> #include <cstdlib> #include <thread> #include <mutex> #include <vector> using namespace std; template <class T> struct RGB { T r, g, b; }; template <class T> class

问题 I have created a program which creates a Mandelbrot set. Now I'm trying to make it multithreaded. // mandelbrot.cpp // compile with: g++ -std=c++11 mandelbrot.cpp -o mandelbrot // view output with: eog mandelbrot.ppm #include <fstream> #include <complex> // if you make use of complex number facilities in C++ #include <iostream> #include <cstdlib> #include <thread> #include <mutex> #include <vector> using namespace std; template <class T> struct RGB { T r, g, b; }; template <class T> class

问题 this is a bit longer, the first part is just a description of the problem, the second one the question if my "fix" is correct. I started with python programming. I created a program that communicates with an Arduino that reads the temperature of a furnace of our melting lab. The temperature is then used in a PID algorithm and an output is set to the Arduino. The communication is done via pyserial. So far, everthing works, including live plotting of the temperature signals, PID-variables and

问题 I have this piece of code in which I try to send an UDP datagram in a new thread import threading, socket address = ("localhost", 9999) def send(sock): sock.sendto("Message", address) print "sent" s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) threading.Thread(target=send, args=(s)).start() But when I try to give the socket as an argument to the function, a TypeError exception is thrown: Exception in thread Thread-1: Traceback (most recent call last): File "/usr/lib/python2.7/threading

问题 I read that there was a new keyword in C++: it's __thread from what I've read. All I know is that it's a keyword to be used like the static keyword but I know nothing else. Does this keyword just mean that, for instance, if a variable were declared like so: __thread int foo; then anything to do with that variable will be executed with a new thread? 回答1: It's thread_local , not __thread . It's used to define variables which has storage duration of the thread. thread_local is a new storage