I need this for testing, it looks like i have the situation that the OS is buffering the write operation to a file. So in the test for isfile this is true, but the content has not been fully written.

I’m 99% sure that if you don’t see the file content update, it’s not the OS but actually the user space that’s buffering the content. OS buffering happens when write to the underlying media is delayed and shouldn’t be observable when reading the file from the same host, and should be only observable…

Testing if there’s anyone opening the file should be possible, assuming you have permission to query the openning process. I believe fuser, lsof etc use procfs on Linux. I’m not aware of any library implementation and I’m not sure how it’s implemented elsewhere. (I think windows may simply block you…

I agree with most of your post and the cases where i have seen (excessive) OS buffering it was in an server/VM/container environment. In this case there might be a user space problem, but unfortunately i cannot control the actual file operations, as this is inside a library and julia side is ccallin…

It just doesn’t really make sense that the OS will hold the change you’ve told it without letting anyone see. It’ll likely even be bad for performance since the OS has to keep multiple copies of the file content. To really debug, you should log all the cairo calls. You can then either see whether y…

to 2. Actually at the time of this discussion i did this (gdb of julia-debug, debug version, breakpointing cairo_x calls) on linux and it did look good (destroy → file available). I don’t have access to OSX, so i trusted Andreas’ solution. to 3. I thought for some time into the same direction: What…

Maybe a last question here: Do you have a recommendation for 2 (log all calls, on linux)? I just failed trying to use ltrace on a julia process, i see the startup, but then subprocesses or threads are doing the magic.

[image] lobingera: If the result is zero, then surface and all associated resources are freed The device is a seperate object you construct. It is obviously not associated with the surface. [image] lobingera: That ‘tracing’ triggered my question here: Testing GC and finalizers I saw t…

[image] yuyichao: The device is a seperate object you construct. It is obviously not associated with the surface. I tend to disagree, as the sequence of creating is: cairo_script_create for the device, cairo_script_surface_create based on the device - while i agree the julia code doesn’t hol…

[image] lobingera: i agree the julia code doesn’t hold reference No. The whole point is that you didn’t release the reference to the script explicitly. [image] lobingera: I’d like to write a test in such a way, that the finalizer is called and i can test that it was called - without crea…

How to test if a file is existing and 'closed'?

General Usage

lobingera August 25, 2018, 6:12pm 7

btw: That ‘tracing’ triggered my question here: Testing GC and finalizers

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How to test if a file is existing and 'closed'?

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