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44a79a6eca
Per https://cygwin.com/pipermail/cygwin-developers/2021-October/012429.html, we may encounter a crash when starting multiple threads during process startup (here: fhandler_fifo::fixup_after_{fork,exec}) which in turn allocate memory via malloc. The problem is concurrent usage of malloc before the malloc muto has been initialized. To fix this issue, convert the muto to a SRWLOCK and make sure it is statically initalized. Thus, malloc can be called as early as necessary and malloc_init is only required to check for user space provided malloc. Note that this requires to implement a __malloc_trylock macro to be called from fork. Signed-off-by: Corinna Vinschen <corinna@vinschen.de>