[Fiasco.OC] Desctruction of objects created by factory

Adam Lackorzynski adam at os.inf.tu-dresden.de
Wed Mar 27 23:54:28 CET 2013


On Wed Mar 27, 2013 at 15:38:56 +0400, Sergey Grekhov wrote:
> Hello, L4 hackers!
> I have a question about Fiasco.OC.
> I am a bit stuck in understanding of how objects created by factory are destroyed? For example, we have a call from user space l4_factory_create_thread(). It creates object in Fiasco (file fiasco/src/kernel/factory.cpp) and map it using call map() from fiasco/src/kernel/map_util.cpp. However, the procedure of destruction of created objects (tasks, threads, gates, irqs, vms) is not clear: it seems that there is some kind of the "garbage collector", but I can not figure out some important things. Particularly:
> 1) where is the code which essentially destroys created objects (call destructors)?
> 2) what conditions make "garbage collection" to start?
> 3) how "garbage collection" can be forced from user-space?

Objects will be destroyed when their last mapping disappears in any
task, aka when they're unmapped. See for a 'delete' operation in
map_util.cpp for where they're destroyed.

Adam                 adam at os.inf.tu-dresden.de
  Lackorzynski         http://os.inf.tu-dresden.de/~adam/

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