the main arena, but a subsequent allocation from it fails: then, and
only then, may we switch to another arena to retry that allocations, and
for further allocations within that thread.
+@end deftp
@deftp Probe memory_arena_reuse_wait (void *@var{$arg1}, void *@var{$arg2}, void *@var{$arg3})
This probe is triggered when @code{malloc} is about to wait for an arena
an existing arena was chosen for reuse, but its mutex could not be
immediately acquired. The mutex in @var{$arg1} is the mutex of the
selected arena.
+@end deftp
@deftp Probe memory_arena_reuse_free_list (void *@var{$arg1})
This probe is triggered when @code{malloc} has chosen an arena that is