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is it safe to write to a file in another thread?

By : Md Kalimullah Mith
Date : September 12 2020, 06:00 PM
This might help you You need to call pthread_join() in the child process to avoid potential race conditions during the child process’s exit sequence (for example the child process can otherwise exit before its thread gets a chance to write to the file). Calling pthread_join() in the parent process won’t help,
As for the file, having both processes write to it is safe in the sense that it won’t cause a crash, but the order in which the data is written to the file will be indeterminate since the two processes are executing concurrently.
code :

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How to write lines to a text file thread safe - multi threading

By : 歐巴馬
Date : March 29 2020, 07:55 AM
it fixes the issue I just tried this and it failed , How about this?
code :
TextWriter.Synchronized(myWriter).WriteLine("Hello World!!!");

Java thread safe write to xml file?

By : Brunno Ed
Date : March 29 2020, 07:55 AM
I wish did fix the issue. You should synchronize your methods.
Here is an example:
code :
public class SynchronizedCounter {
    private int c = 0;

    public synchronized void increment() {

    public synchronized void decrement() {

    public synchronized int value() {
        return c;

Write thread-safe to file in python

By : user3613059
Date : March 29 2020, 07:55 AM
like below fixes the issue How can I write data to a file in Python thread-safe? I want to safe some variables to a file for every request and every hour I want to do some grouping and write it to mysql. , We used the logging module:
code :
import logging

logpath = "/tmp/log.log"
logger = logging.getLogger('log')
ch = logging.FileHandler(logpath)

def application(env, start_response):
   logger.info("%s %s".format("hello","world!"))
   start_response('200 OK', [('Content-Type', 'text/html')])
   return ["Hello!"]

(C#) to make file read/write thread-safe (and considering performance)

By : mimid
Date : March 29 2020, 07:55 AM
Does that help No, for few reasons.
First of all don't forget that file system gives you the kind of concurrency you need then you don't need to implement anything specifically. Note that thread-safe does not mean that resource can't be accessed concurrently but that its use won't result in a failure (in a very broad sense).
code :
public static string ReadFile(string path) {
    for (int retry=0; retry < 3; ++retry) {
        try {
            return File.ReadAllText(path);
        catch (IOException e) {
            // 0x80070020 is value for ERROR_SHARING_VIOLATION
            if (Marshal.GetHRForException(e) == 0x80070020) {
                Thread.Sleep(1000); // Wait and try again

var rwLock = s_locks.GetOrAdd(path, () => new ReaderWriterLock());

Making write to a file thread safe

By : Stephen Davis
Date : March 29 2020, 07:55 AM
I wish this help you You could give a lock by File#flock
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