https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107180
Bug ID: 107180
Summary: Itanium ABI says to block in the emergency EH buffer
if memory cannot be acquired
Product: gcc
Version: 13.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: redi at gcc dot gnu.org
Target Milestone: ---
https://itanium-cxx-abi.github.io/cxx-abi/abi-eh.html#imp-emergency says:
"Additional threads are blocked until one of the 16 de-allocates its emergency
buffer storage."
Ignoring the fact that we don't limit the number of threads that can use the
buffer concurrently, our __cxa_allocate_exception first tries malloc, then
tries the emergency pool, then terminates. We should add a condition_variable
to the pool and block when it's full.
This needs to be optional though. For some users blocking indefinitely is worse
than terminating. Maybe use a tunable.
