Add __emutls_unregister_key function

Replace the existing __attribute__((destructor)) function,
unregister_emutls_key, with a function that something else must call
explicitly. We don't want the pthread key deleted at program exit, because
it's unnecessary and because it may delete the key before other tls-using
cleanup code runs. Exposing __emutls_unregister_key allows limiting the
cleanup to dlclose (e.g. by calling it only from crtbegin_so.c).

Reset emutls_key_created so multiple calls to __emutls_unregister_key are
safe.

Bug: b/80453944
Test: manual
Change-Id: I82d13614ae8042d0501fd2ca64f0ef6189669905

0 files changed, 0 insertions, 0 deletions