Use weak_ptr to store context in GraphListener#906

Merged

ivanpauno merged 4 commits intoros2:masterfrom

Barry-Xu-2018:topic-fix-not-delete-context

Dec 2, 2019

Commits on Oct 23, 2019

Clear sub contexts to make context shared_ptr not to be hold.
Barry-Xu-2018
committed

Commits on Nov 19, 2019

refactor to use weak_ptr to store sub_context instead of share_ptr
Barry-Xu-2018
committed

Commits on Nov 27, 2019

revert previous modification, use weak_ptr to store context in graph listener
Barry-Xu-2018
committed

Commits on Nov 28, 2019

use interrupt_guard_condition_context_ directly
Barry-Xu-2018
committed