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On Monday, 29 November 2021 at 09:02:06 UTC Manolo wrote:
I believe the error is in that function, output(), in the call to Fl::awake(). The memory storage of the 2nd argument sent to Fl::awake is unstable, it can be reused at any time after return from the Fl::awake() function.
Change that 2nd argument to a form where you control the lifetime of this char array, and make sure it's not changed until it's been used by the main thread.
Yes - I agree with Manolo. As I said earlier "threads are hard". The key point here is that the output() function will be called "now" in the context of the worker thread, and the passed string s will hold the expected value at that time. However, the awake() function will be called "later" in the main context, at which point the string it is passed (via the void *v) may have expired and you get rubbish instead. You need to ensure that any parameters passed to the awake() function have a lifetime sufficient for the purpose.
The asynchronous nature of threads can be challenging....
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