multithreading

问题 DispatchQueue.global(qos: .background).async { //This will run on the background queue self.writeValue(tag: GlobalData.WRITE_DATA, data: getDataForWrite(1) ) self.writeValue(tag: GlobalData.WRITE_DATA, data: getDataForWrite(2) ) self.writeValue(tag: GlobalData.WRITE_DATA, data: getDataForWrite(3) ) self.writeValue(tag: GlobalData.WRITE_DATA, data: getDataForWrite(4) ) self.writeValue(tag: GlobalData.WRITE_DATA, data: getDataForWrite(5) ) // ..... DispatchQueue.main.async { //This will run on

问题 I have to make a simple task - singleview app with two buttons and three treads - Start Button : create a thread T1 - the GPS location of the device is collected repeatedly every 3.0 seconds, and the results (as a string) are handed over to T3. create w thread T2 - the percentage usage of the device's battery is collected repeatedly every B seconds, and the results (as a string) are handed over to T3. Data from T1 and T2 should be stored in array with limited positions (maxData). In Thread T3

问题 I have to make a simple task - singleview app with two buttons and three treads - Start Button : create a thread T1 - the GPS location of the device is collected repeatedly every 3.0 seconds, and the results (as a string) are handed over to T3. create w thread T2 - the percentage usage of the device's battery is collected repeatedly every B seconds, and the results (as a string) are handed over to T3. Data from T1 and T2 should be stored in array with limited positions (maxData). In Thread T3

问题 I'm having a hard time understanding hyper-threading. If the logical core doesn't actually exist, what's the point of using hyper-threading?. The wikipedia article states that: For each processor core that is physically present, the operating system addresses two virtual (logical) cores and shares the workload between them when possible. If the two logical cores share the same execution unit, that means one of the threads will have to be put on hold while the other executes, that being said,

问题 I'm having a hard time understanding hyper-threading. If the logical core doesn't actually exist, what's the point of using hyper-threading?. The wikipedia article states that: For each processor core that is physically present, the operating system addresses two virtual (logical) cores and shares the workload between them when possible. If the two logical cores share the same execution unit, that means one of the threads will have to be put on hold while the other executes, that being said,

问题 I'm having a hard time understanding hyper-threading. If the logical core doesn't actually exist, what's the point of using hyper-threading?. The wikipedia article states that: For each processor core that is physically present, the operating system addresses two virtual (logical) cores and shares the workload between them when possible. If the two logical cores share the same execution unit, that means one of the threads will have to be put on hold while the other executes, that being said,

问题 Problem Im using hibernate 5.4.11 core and when i try to update large amounts of entities i run into that issue right here. It looks like an hibernate internal exception. Update I tested it with hibernate 5.4.23, the same exception occured. I also updated my "mysql connector" to the latest version "8.0.22" and it didnt worked either, the same exception. Describtion This is how i update my entities, it runs in another thread, which should not be the problem here... its basically a own thread

问题 From a tutorial, I've seen that signals and slots can be used to make callbacks from a worker thread into the main GUI thread, but I'm uncertain how to establish bi-directional communication using signals and slots. The following is what I am working with: class RespondedToWorkerSignals(QObject): callback_from_worker = pyqtSignal() class RespondedToWorker(QRunnable): def __init__(self, func, *args, **kwargs): super(RespondedToWorker, self).__init__() self._func = func self.args = args self

问题 When i use std::call_once in Linux version 2.6.36,it makes an error: terminate called after throwing an instance of 'std::system_error' what(): Unknown error -1 Aborted Compile command: mipsel-buildroot-linux-uclibc-g++ callonce.cpp -o callonce -static -lpthread my code: #include <iostream> #include <mutex> using namespace std; int main() { cout << "Hello world" << std::endl; static once_flag of; call_once(of,[]{}); return 0; } 回答1: There is a major difference between linking statically and

问题 When i use std::call_once in Linux version 2.6.36,it makes an error: terminate called after throwing an instance of 'std::system_error' what(): Unknown error -1 Aborted Compile command: mipsel-buildroot-linux-uclibc-g++ callonce.cpp -o callonce -static -lpthread my code: #include <iostream> #include <mutex> using namespace std; int main() { cout << "Hello world" << std::endl; static once_flag of; call_once(of,[]{}); return 0; } 回答1: There is a major difference between linking statically and