multithreading

问题 I've used the program answered in this link with some modifications. Below is my modified code: #include <linux/netlink.h> #include <netlink/netlink.h> #include <netlink/route/qdisc.h> #include <netlink/route/qdisc/plug.h> #include <netlink/socket.h> #include <atomic> #include <csignal> #include <iostream> #include <stdexcept> #include <unistd.h> #include <sys/types.h> #include <sys/wait.h> #include <thread> #include <queue> #include <chrono> /** * Netlink route socket. */ struct Socket {

问题 My android espresso unit test blocked due to some background thread not idle. How can i figure out which thread is blocking my application to execute? android.support.test.espresso.AppNotIdleException: Looped for 246 iterations over 60 SECONDS. The following Idle Conditions failed ASYNC_TASKS_HAVE_IDLED. at dalvik.system.VMStack.getThreadStackTrace(Native Method) at java.lang.Thread.getStackTrace(Thread.java:580) at android.support.test.espresso.base.DefaultFailureHandler.getUserFriendlyError

问题 My android espresso unit test blocked due to some background thread not idle. How can i figure out which thread is blocking my application to execute? android.support.test.espresso.AppNotIdleException: Looped for 246 iterations over 60 SECONDS. The following Idle Conditions failed ASYNC_TASKS_HAVE_IDLED. at dalvik.system.VMStack.getThreadStackTrace(Native Method) at java.lang.Thread.getStackTrace(Thread.java:580) at android.support.test.espresso.base.DefaultFailureHandler.getUserFriendlyError

问题 In my application I am calling third part vendor web-service. I need to delay my thread processing to achieve required throughput supported by vendor webservice. I have two options 1. Use Thread.Sleep 2. use ScheduledThreadPoolExecutor as mentioned in the post How to start a thread after specified time delay in java Wanted to know which is better option as we are sending time critical information(Text Message) using Vendor webservice. Any help is appreciated. 回答1: They're pretty much the same

问题 My code: #include <cstdio> #include "omp.h" int main() { omp_set_num_threads(4); #pragma omp parallel { #pragma omp parallel for // Adding "parallel" is the cause of the problem, but I don't know how to explain it. for (int i = 0; i < 6; i++) { printf("i = %d, I am Thread %d\n", i, omp_get_thread_num()); } } return 0; } The output that I am getting: i = 0, I am Thread 0 i = 1, I am Thread 0 i = 2, I am Thread 0 i = 0, I am Thread 0 i = 1, I am Thread 0 i = 0, I am Thread 0 i = 1, I am Thread

问题 In my application I am calling third part vendor web-service. I need to delay my thread processing to achieve required throughput supported by vendor webservice. I have two options 1. Use Thread.Sleep 2. use ScheduledThreadPoolExecutor as mentioned in the post How to start a thread after specified time delay in java Wanted to know which is better option as we are sending time critical information(Text Message) using Vendor webservice. Any help is appreciated. 回答1: They're pretty much the same

问题 Im working on a java standAlone project. I need to use hibernate in a MultiThread application but i just cant figure it out how to set up this correctly. Each Thread deals with the same process of the others. Everything goes Ok when i run it in a Non-Async way, but when i call the same thing using threads, hibernate just don't work fine. Can anyone please explain me what's the correct way to use Hibernate in a multiThread Java Stand-Alone App? Hibernate Util public class HibernateUtil {

问题 My code: #include <cstdio> #include "omp.h" int main() { omp_set_num_threads(4); #pragma omp parallel { #pragma omp parallel for // Adding "parallel" is the cause of the problem, but I don't know how to explain it. for (int i = 0; i < 6; i++) { printf("i = %d, I am Thread %d\n", i, omp_get_thread_num()); } } return 0; } The output that I am getting: i = 0, I am Thread 0 i = 1, I am Thread 0 i = 2, I am Thread 0 i = 0, I am Thread 0 i = 1, I am Thread 0 i = 0, I am Thread 0 i = 1, I am Thread

问题 Im working on a java standAlone project. I need to use hibernate in a MultiThread application but i just cant figure it out how to set up this correctly. Each Thread deals with the same process of the others. Everything goes Ok when i run it in a Non-Async way, but when i call the same thing using threads, hibernate just don't work fine. Can anyone please explain me what's the correct way to use Hibernate in a multiThread Java Stand-Alone App? Hibernate Util public class HibernateUtil {

问题 I've been reading up on the differences between a HashMap , HashSet , and HashTable . A key thing I've been noticing is that I've seen that HashMap / HashSet are not synchronized while a HashTable is. However in a code base that I've seen before there are several places where a block like this is used: synchronized (hashSet) { //Some code involving the hashset } How is this possible if a HashSet isn't synchronized? Does the synchronized block simply allow us to use a non synchronous data