multithreading

问题 Every method that called before thread is running, works good, but after starting a thread It doesn't enters aspect. I'm using JDK dynamic proxy objects that implements interface, all public methods called from other thread and not from object itself. I'm using spring 3.0.6. Please help me to understand what I'm missing. Aspect: @Aspect public class CabLoggingAspect { public void init() { System.out.println("CabLoggingAspect: init()"); } @Pointcut("execution(* com.station.taxi.ICab.*(..))")

问题 It's possible I might be trying to use threading for something I shouldn't be, if so please let me know. I made a smaller example of my code so it's simpler to understand what I'd like. I'm having users input IP addresses, then i'm pinging the IP addresses they entered. I'd like to ping x number of IP addresses at a time, in this example its 4. The issue is that each thread pings all 4 IP addresses. I'd like 1 thread to ping IP 1, then another to ping IP 2, then if thread 1 is fished with IP

问题 It's possible I might be trying to use threading for something I shouldn't be, if so please let me know. I made a smaller example of my code so it's simpler to understand what I'd like. I'm having users input IP addresses, then i'm pinging the IP addresses they entered. I'd like to ping x number of IP addresses at a time, in this example its 4. The issue is that each thread pings all 4 IP addresses. I'd like 1 thread to ping IP 1, then another to ping IP 2, then if thread 1 is fished with IP

问题 I am writing a program that will eventually be used to have one child process send randomly generated characters through a pipe to another child process to convert to uppercase values and output, but before I get that far, I am trying to create the child processes and make some expected output. I have written the following application: #include <stdio.h> /* printf, stderr, fprintf */ #include <sys/types.h> /* pid_t */ #include <unistd.h> /* fork */ #include <stdlib.h> /* _exit */ #include

问题 I am writing a program that will eventually be used to have one child process send randomly generated characters through a pipe to another child process to convert to uppercase values and output, but before I get that far, I am trying to create the child processes and make some expected output. I have written the following application: #include <stdio.h> /* printf, stderr, fprintf */ #include <sys/types.h> /* pid_t */ #include <unistd.h> /* fork */ #include <stdlib.h> /* _exit */ #include

问题 I am writing a program that will eventually be used to have one child process send randomly generated characters through a pipe to another child process to convert to uppercase values and output, but before I get that far, I am trying to create the child processes and make some expected output. I have written the following application: #include <stdio.h> /* printf, stderr, fprintf */ #include <sys/types.h> /* pid_t */ #include <unistd.h> /* fork */ #include <stdlib.h> /* _exit */ #include

问题 I've used the Delphi many years ago, I remember that in version 7 and even then I did not have much knowledge, I worked with C++ since then and I am currently working in a company using Delphi XE10 and realized that searching I found a lot of random things of difference versions and that makes me a little confused. I'm playing with threads and I wanted to update the GUI and searching I found the Synchronize and the way in which it works shows the impact it has on performance, you can notice

问题 Let's assume that variable a = 0 Processor1: a = 1 Processor2: print(a) Processor1 executes it's instruction first then in next cycle processor2 reads variable to print it. So is: processor2 gonna stall until cache coherence operation completes and it will print 1 P1: |--a=1--|---cache--coherence---|---------------- P2: ------|stalls due to coherence-|--print(a=1)---| time: -----------------------------------------------> processor2 will operate before cache coherence operation completes and

问题 I have a class with a static var like so private static Object sMyStaticVar; if i want to assign a value to this var in the constructor I have code like if(sMyStaticVar == null) sMyStaticVar = new CustomObject(someRuntimeObject); where someRuntimeObject is an object that is not available at the time my class is loaded and therefore prevents me from declaring my static var like the below private static Object sMyStaticVar = new CustomObject(someRuntimeObject); my question is, is the

问题 I have a class with a static var like so private static Object sMyStaticVar; if i want to assign a value to this var in the constructor I have code like if(sMyStaticVar == null) sMyStaticVar = new CustomObject(someRuntimeObject); where someRuntimeObject is an object that is not available at the time my class is loaded and therefore prevents me from declaring my static var like the below private static Object sMyStaticVar = new CustomObject(someRuntimeObject); my question is, is the