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os: add 'Attached_dataspace::invalidate'

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This commit is contained in:
Norman Feske 2014-10-02 22:18:43 +02:00
parent b2b5d1b2d2
commit 2f5cff5347
1 changed files with 17 additions and 2 deletions
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19
repos/os/include/os/attached_dataspace.h
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@ -35,7 +35,7 @@ class Genode::Attached_dataspace : Noncopyable
size_t const _size = { Dataspace_client(_ds).size() }; size_t const _size = { Dataspace_client(_ds).size() };
void * const _local_addr = { env()->rm_session()->attach(_ds) }; void *_local_addr = { env()->rm_session()->attach(_ds) };
Dataspace_capability _check(Dataspace_capability ds) Dataspace_capability _check(Dataspace_capability ds)
{ {
@ -58,7 +58,11 @@ class Genode::Attached_dataspace : Noncopyable
/** /**
* Destructor * Destructor
*/ */
~Attached_dataspace() { env()->rm_session()->detach(_local_addr); } ~Attached_dataspace()
{
if (_local_addr)
env()->rm_session()->detach(_local_addr);
}
/** /**
* Return capability of the used dataspace * Return capability of the used dataspace
@ -78,6 +82,17 @@ class Genode::Attached_dataspace : Noncopyable
* Return size * Return size
*/ */
size_t size() const { return _size; } size_t size() const { return _size; }
/**
* Forget dataspace, thereby skipping the detachment on destruction
*
* This function can be called if the the dataspace is known to be
* physically destroyed, e.g., because the session where the dataspace
* originated from was closed. In this case, core will already have
* removed the memory mappings of the dataspace. So we have to omit the
* detach operation in '~Attached_dataspace'.
*/
void invalidate() { _local_addr = nullptr; }
}; };
#endif /* _INCLUDE__OS__ATTACHED_DATASPACE_H_ */ #endif /* _INCLUDE__OS__ATTACHED_DATASPACE_H_ */