multithreading

问题 I am using TIdHttp and TXMLDocument inside a thread in a Delphi program. Now I want to know: Do these classes use COM objects so I need to call CoInitialize and CoUninitialize in this thread? If yes, do I have to use these functions at the body of execute method or at all methods that use TIdHttp or TXMLDocument classes? 回答1: TIdHTTP has no COM dependency. TXMLDocument can have a dependency on COM. On Windows, out of the box it is a wrapper around Microsoft's MSXML ActiveX component, which

问题 Yesterday I asked a similar question and somebody suggested me to use concurrent.futures and asyncio. What I want is skipping the file if it takes too long to process. Here is my code: import os, glob import time import asyncio from concurrent.futures import ProcessPoolExecutor @asyncio.coroutine def coro(loop, of, filename): ex = ProcessPoolExecutor(4) yield from loop.run_in_executor(ex, os.system, "\"C:\\P.exe\" -o {} {}".format(of, filename)) for folder, subfolders, filenames in os.walk

问题 I have a method to be called. public void RecordConversation(ref ChannelResource cr) { VoiceResource RecordResource = TServer.GetVoiceResource(); RecordResource.MaximumTime = 6000; RecordResource.MaximumSilence = 6000; RecordResource.TerminationDigits = ""; } To call it in a thread Thread recordThread = new Thread(() => RecordConversation(ref ChanResource)); recordThread.Start(); Of course we get an error. Cannot use ref or out parameter 'ChanResource' inside an anonymous method, lambda

问题 Apparently, something in the application calls the method from different threads (both main and a binder thread) which causes an internal ANR. It happens quite frequently and I don't have an idea as to where it happens because I cannot reproduce it on emulators or the test devices that I have got. What the app does : It is an app locker application, which draws a full screen lock view on application overlay and asks for a password (pattern), which also supports fingerprint unlock mechanism.

问题 I would like to run a job on the cluster. There are a different number of CPUs on different nodes and I have no idea which nodes will be assigned to me. What are the proper options so that the job can create as many tasks as CPUs on all nodes? #!/bin/bash -l #SBATCH -p normal #SBATCH -N 4 #SBATCH -t 96:00:00 srun -n 128 ./run 回答1: One dirty hack to achieve the objective is using the environment variables provided by the SLURM. For a sample sbatch file: #!/bin/bash #SBATCH --job-name=test

问题 So I am attempting to process records from a datatable one row at a time. I am new to multi-threaded environments and I was asked to use Parallel.Foreach Loop. I wanted to know how local variables are treated in a Parallel execution mode. Following is my code. Parallel.ForEach(dtReportData.Tables[0].AsEnumerable(), drow => { string strType = drow["type"]; //Based on this type, I am executing logic from a switch case. }); Now. I want to know if I can declare and assign value to the variable

问题 When I set n_jobs=-1 I get error and if I set n_jobs equal big value (n_jobs=100), but if set smaller value (e.g. n_jobs=32), it works fine. I've tried reinstall scikit-learn and joblib packages, but to no avail. Also, it (n_jobs=-1) works fine previously, but suddenly go wrong. from sklearn import datasets from sklearn.model_selection import cross_validate, StratifiedKFold from sklearn.linear_model import RidgeClassifier iris = datasets.load_iris() iris_X = iris.data iris_y = iris.target skf

问题 I'm trying to write a thread-safe queue using pthreads in c++. My program works 93% of the time. The other 7% of the time it other spits out garbage, OR seems to fall asleep. I'm wondering if there is some flaw in my queue where a context-switch would break it? // thread-safe queue // inspired by http://msmvps.com/blogs/vandooren/archive/2007/01/05/creating-a-thread-safe-producer-consumer-queue-in-c-without-using-locks.aspx // only works with one producer and one consumer #include <pthread.h>

问题 I am a beginner of multi-threaded programming, and now I know that when a signal was sent while waiting with pthead_cond_wait() , the result depends on the OS. Can somebody tell me how to know how the call was interrupted, and how to write portable code? #include <stdio.h> #include <signal.h> #include <pthread.h> void sigusr1_handler(int sig) { printf("signal called\n"); } int main() { int n; pthread_mutex_t mut; pthread_cond_t cond; struct timespec ts; signal(SIGUSR1, sigusr1_handler);

问题 Problem; Only hearing one sound clip when executed. After one sound has played the other doesn't play & neither can play at the same time. Result; To be able to play 2 sounds at the same time. Code: import java.io.*; import javax.sound.sampled.*; public class ThreadPlay extends Thread { private String filename; // The name of the file to play private boolean finished; // A flag showing that the thread has finished private ThreadPlay(String fname) { filename = fname; finished = false; } public