[SSSD] [sssd PR#46][comment] sss_client: Defer thread cancellation until completion of nss/pam operations

[fidencio]

URL: https://github.com/SSSD/sssd/pull/46
Title: #46: sss_client: Defer thread cancellation until completion of nss/pam operations

HouzuoGuo commented:
"""
All right, `once` is now gone and mutex is now guarding cancellation state.
"""

See the full comment at https://github.com/SSSD/sssd/pull/46#issuecomment-259411671