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emscripten: signal when data is written (so it persists) #1631

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Beuc commented Nov 10, 2018

The virtual filesystem is transient until an asynchronous sync message is signaled.
This patch does it when the user saves their game.


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renpytom commented Nov 10, 2018

I'm holding off until 7.1.2 is out to merge this.

That being said, I'm wondering if it might make sense to deal with this at some sort of lower level - like through a patch to Python. It just feels really wrong to annotate Ren'Py with code that just brings things into compliance with the way Python is documented to work, you know?

Can you call the emscripten stuff from C? It should be easy to check to see if a Python file object is read-write, and call if from there.


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Beuc commented Nov 11, 2018


This is necessary to synchronize the ~/.renpy/ mount point only. The root filesystem is in transient.
Reference for that function is at
It would not make sense to call syncfs e.g. everytime a line is written to log.txt.
Also architecturally, doing syncs purely at the Python level means we can miss syncs in C modules.

The emscripten module is my C wrapper:
so everything is called from C.

renpytom added a commit that referenced this pull request Dec 10, 2018

Signal when data is written.
This is a rewrite of #1631, to put all the emscripten changes into
a single function.

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renpytom commented Dec 10, 2018

I rewrote this in 372216e, to route all of this through a single method.

@renpytom renpytom closed this Dec 10, 2018

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