Commits on Jul 22, 2024

1. Fix deadlock for CUDA …

   It has been noticed that Tests/GPU/CNS/Exec/RT hangs with
   `amrex.the_arena_init_size=0 amrex.the_arena_release_threshold=0`. The issue
   appears to be CUDA host callback functions do not work well with cudaFree in
   the main host thread. Note that we don't have any CUDA API calls in the host
   callback function. Also note that cudaMall seems work and using a single GPU
   stream also works.
   
   A workaround is implemented to avoid cudaFree when there are host callback
   functions inside an MFIter loop.

   

   WeiqunZhang committed Jul 22, 2024
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