execution

问题 My main process calls an external library method. This method sometimes hangs. I can not fix the external library because another company is responsible for it. I want to use a Thread for the library calls with a defined execution timer. When the method call takes to long, the Thread with the Runnable in which the method call is placed should stop and the main process should go forward. Main Thread wait Execute Thread start Start timer Thread When timer thread is finished kill Execute Thread

问题 I have to send mails to all users in the site when a new user joins. My problem is the script stops execution after sending around 400 mails. I have set the set_time_limit to 0. And also I am giving sleep(2) after sending 10 mails. What may be the reason behind this issue.Any solution for this problem . Is there any better method to send bulk emails? Thanks in Advance Rose 回答1: The way we do it is with the help of cron. We (at our company) split up the userlist in blocks of 50 addresses.

问题 I'm trying to use LibreOffice for converting a spreadsheet to another format, when I execute the command from the console it works fine but when I do it from PHP using exec() or system() it doesn't work. It doesn't show any error or anything, it simply silently fails, if I try executing some simple command like "ls" it works just fine. This is the command I'm using: <?php system("libreoffice --headless -convert-to ooxml '/home/www/path_to_app/file.xlsx' -outdir /home/www/path_to_app/"); I

问题 In Apache Spark program how do we know which part of code will execute in driver program and which part of code will execute in worker nodes? With Regards 回答1: It is actually pretty simple. Everything that happens inside the closure created by a transformation happens on a worker. It means if something is passed inside map(...) , filter(...) , mapPartitions(...) , groupBy*(...) , aggregateBy*(...) is executed on the workers. It includes reading data from a persistent storage or remote sources

问题 I want to force the current execution line to a specific line in the same function, possibly skipping intermediate lines. All my old school debuggers had this feature, but I can't find it in eclipse. Is there a way to do it without changing code? 回答1: The first two answers seem to miss the topic, unless it is me not understanding the question. My understanding, a feature I searched myself, is that you want to skip a number of lines (when stepping in code) and set the program counter (to take

问题 So, I have a bash script that should pipe the output of ifconfig to a text file on the hour, every hour. As many people seem to have encountered, this script does not function properly when used by cron. However, most of the fixes for this that I have seen do not seem to be applicable in my case. I have all paths explicitly stated, the script has execute permissions, and there is a newline at the end of the cron file. creatively enough, my scrip, ip.sh, contains: ifconfig > /home/drake

问题 I wrote a program in IDLE to tokenize text files and it starts to tokeniza 349 text files! How can I stop it? How can I stop a running Python program? 回答1: To stop your program, just press Control + C . 回答2: You can also do it if you use the exit() function in your code. More ideally, you can do sys.exit() . sys.exit() might terminate Python even if you are running things in parallel through the multiprocessing package. 回答3: If your program is running at an interactive console, pressing CTRL

问题 I would like to collect here what happens when you run an executable on Windows, Linux and OSX. In particular, I would like to understand exactly the order of the operations: my guess is that the executable file format (PE, ELF or Mach-O) is loaded by the kernel (but I ignore the various sections of the ELF（Executable and Linkable Format） and their meaning), and then you have the dynamic linker that resolves the references, then the __init part of the executable is run, then the main, then

问题 I have a PowerShell 1.0 script to just open a bunch of applications. The first is a virtual machine and the others are development applications. I want the virtual machine to finish booting before the rest of the applications are opened. In bash I could just say "cmd1 && cmd2" This is what I've got... C:\Applications\VirtualBox\vboxmanage startvm superdooper &"C:\Applications\NetBeans 6.5\bin\netbeans.exe" 回答1: Normally, for internal commands PowerShell does wait before starting the next

问题 What is the predefined order in which the clauses are executed in MySQL? Is some of it decided at run time, and is this order correct? FROM clause WHERE clause GROUP BY clause HAVING clause SELECT clause ORDER BY clause 回答1: The actual execution of MySQL statements is a bit tricky. However, the standard does specify the order of interpretation of elements in the query. This is basically in the order that you specify, although I think HAVING and GROUP BY could come after SELECT : FROM clause