deadlock

问题 I am facing an issue with communication between threads in a C#.NET application. Hope someone will guide me in the right direction about the possible solutions. I have an application in C#.NET.It is a windows form application. My application has two threads - One thread is the main thread (UI thread) and the other one is the child thread. Lets call the child thread the "workerThread" There is only one form used in the application.Lets call this form the "MainForm" The child thread is started

问题 Let me start with thank you for taking the time for reading this. First off I would like to start to share my code, see blow. It is around 200 lines of code but most of the lines are property definitions. Some context: I am just trying to get a beter understanding of multiprocessing so I went and made a small project to try and run multiple processes which all share a single input and output queue. It works, but sometimes it deadlocks right after calling the scheduler.start() method. I am

问题 I am trying to make a code to scan from a folder link all my files and make a "top 10" by his size with also a regexp based on his content and his name. file. By it content, I make channels with goroutines but I dont understand why each time my goroutines are locked. Here is my code: package main import ( "flag" "fmt" "io/ioutil" "regexp" "runtime" "sort" "sync" "time" ) var rName = ".php" var rContent = "php" var maxSize, minSize int64 var files_ten []File func main() { start := time.Now()

问题 A deadlock would occur if process 1 locks resource A and waits for resource B , while simultaneously (due to context switches at the "right" places) process 2 locks resource B and waits for access to resource A . How does Unix deal with such deadlocks? I read the following here . Many deadlocks can be prevented by simply requiring all processes that lock multiple resources to lock them in the same order (e.g., alphabetically by lock name) How can it change the order in which locks are

问题 I read that this portion of code can cause deadlock: Process p = new Process(); p.StartInfo.UseShellExecute = false; p.StartInfo.RedirectStandardOutput = true; p.StartInfo.FileName = "Write500Lines.exe"; p.Start(); p.WaitForExit(); string output = p.StandardOutput.ReadToEnd(); Because A deadlock condition can result if the parent process calls p.WaitForExit before p.StandardOutput.ReadToEnd and the child process writes enough text to fill the redirected stream. The parent process would wait

问题 I read that this portion of code can cause deadlock: Process p = new Process(); p.StartInfo.UseShellExecute = false; p.StartInfo.RedirectStandardOutput = true; p.StartInfo.FileName = "Write500Lines.exe"; p.Start(); p.WaitForExit(); string output = p.StandardOutput.ReadToEnd(); Because A deadlock condition can result if the parent process calls p.WaitForExit before p.StandardOutput.ReadToEnd and the child process writes enough text to fill the redirected stream. The parent process would wait

问题 From the docs using Popen.wait() may: deadlock when using stdout=PIPE and/or stderr=PIPE and the child process generates enough output to a pipe such that it blocks waiting for the OS pipe buffer to accept more data. Use communicate() to avoid that. In communicate docs it's written that: The data read is buffered in memory, so do not use this method if the data size is large or unlimited How to reproduce such a problematic behavior and see that using Popen.communicate() fixes it? Deadlock

问题 package main import ( "fmt" "net/http" ) func Extract(url string) ([]string, error) { http.Get(url) var links []string return links, nil } func crawl(url string) []string { list, _ := Extract(url) return list } func main() { var ch = make(chan int) ch <- 1 } If I remove the net/http import, it will return a "deadlock" error as expected. But if I import this package, although I didn't invoke the Extract func, the "deadlock" will not appear. 回答1: Importing the net package starts background

问题 I have a multithreaded application that tries to INSERT a record in a table in multiple batches. Each thread processing one batch. At times I get Deadlock error, following is the trace. The table I am trying to insert a record into is like this: RecordBase (Col1, Col2, Col3) Col1 and Col2 together form a composite primary key. I earlier thought it could be due to an index-record lock but the trace clearly shows that the statements that are blocking each other do not have any duplicate records

问题 I have a multithreaded application that tries to INSERT a record in a table in multiple batches. Each thread processing one batch. At times I get Deadlock error, following is the trace. The table I am trying to insert a record into is like this: RecordBase (Col1, Col2, Col3) Col1 and Col2 together form a composite primary key. I earlier thought it could be due to an index-record lock but the trace clearly shows that the statements that are blocking each other do not have any duplicate records