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base: consider exception during child construction

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This patch make sure that a once managed parent RPC object will always be
dissolved if an exception during the remaining child construction
occurs. The original version would miss the dissolve call if one of the
subsequent members throws an exception at construction time.
This commit is contained in:
Norman Feske
2017-05-13 01:03:59 +02:00
committed by Christian Helmuth
parent 4d3d4ecca0
commit 2c6729768d
3 changed files with 17 additions and 10 deletions
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7
repos/base/src/lib/base/child.cc
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@ -707,7 +707,7 @@ void Child::_try_construct_env_dependent_members()
_pd.cap(), _pd.session(), _ram.session(),
*_initial_thread, _local_rm,
Child_address_space(_pd.session(), _policy).region_map(),
_parent_cap);
cap());
}
catch (Out_of_ram) { _error("out of RAM during ELF loading"); }
catch (Out_of_caps) { _error("out of caps during ELF loading"); }
@ -757,8 +757,7 @@ Child::Child(Region_map &local_rm,
Rpc_entrypoint &entrypoint,
Child_policy &policy)
:
_policy(policy), _local_rm(local_rm), _entrypoint(entrypoint),
_parent_cap(_entrypoint.manage(this))
_policy(policy), _local_rm(local_rm), _parent_cap_guard(entrypoint, *this)
{
if (_policy.initiate_env_sessions()) {
initiate_env_ram_session();
@ -769,8 +768,6 @@ Child::Child(Region_map &local_rm,
Child::~Child()
{
_entrypoint.dissolve(this);
/*
* Purge the meta data about any dangling sessions provided by the child to
* other children.