Is reading and writing a Littlefs logfile at the same time allowed?

[arjen1]

Dear forum

I do not seem to get the correct search phrases for this question:

I read sensor input. Every 5 minutes I write 7 values with a time stamp to a logfile in LittleFS.
Now and then I want to read (some) values of this file and show it in a chart.

Can I do that? Can you open a file for writing and a the same time and in another function open the same file for reading without conflict?

Thanks

[AgentSmithers]

Are you using Arduino's LittleFS or some other variation? If so can you provide the link to confirm the implementation.

[arjen1]

I am using the built in LittleFS, I did not install any other library for LittleFS.

[AgentSmithers]

I am using the built in LittleFS, I did not install any other library for LittleFS.

Is this an Arduino project? I am unsure what you mean by "Built-in".

[arjen1]

Using the arduino IDE for an ESP8266 project. I am using the LittleFS library that comes with the Arduino IDE, or maybe when you install the ESP8266 stuff. I did not install any 3rd party LittleFS library.

[AgentSmithers]

This question is specific to LittleFS, not so much Arduino as an interrupt may be triggered to write the data while reading is in progress, however, if LittleFS creates a variable to hold if the data is locked then that will be an issue.

Have you implemented an interrupt/protothreads to handle triggering either reading or writing while the opposite is occurring, or what method are you attempting to use to kick off the read/writing while the other is taking place?