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Asked: 2026-05-20T14:31:51+00:00

I don’t know much about threads, but I have a function in the main

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I don’t know much about threads, but I have a function in the main class of my console application called SendProcessCmd(string cmd). In my main() I create a process, and store the StreamWriter as a class member var, and my SendProcessCmd() issues the .WriteLine() commands to it.

I have another thread with a TCP server that listens for connections, then allows these to send commands to the process using Program.SendProcessCmd(). Is it safe to do this?

The safest method I can think of would be to find the running process in my server’s thread, create a new StreamWriter, then issue the commands. However, this seems like a rather long way around to do the same thing.

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  1. Editorial Team

    The whole purpose of threads is that you can always call any function and access any data structure from any thread. There are gotcha’s, though:

    1. You should always consider concurrency issues, locking and dead-lock avoiding etc.
    2. Some functions and data structures (esp. related to Windows programming) cannot be called/accessed from a thread other than the main UI thread; doing so may crash your program or cause an exception
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