bson_threading - Threading

       MongoDB, Inc

       2017-present, MongoDB, Inc

1.21.0                                            Feb 09, 2022                                 BSON_THREADING(3)

       bson_threading - Threading

       Libbson's  data  structures  are  NOT  thread-safe.  You are responsible for accessing and mutating these
       structures from one thread at a time.

       Libbson requires POSIX threads (pthreads) on all UNIX-like platforms. On Windows,  the  native  threading
       interface  is used. Libbson uses your system's threading library to safely generate unique ObjectIds, and
       to provide a fallback implementation for atomic operations on platforms without built-in atomics.