mongoc_client_t *

       MongoDB, Inc

       2009-present, MongoDB, Inc.

1.30.4                                            Jun 08, 2025                         MONGOC_CLIENT_POOL_POP(3)

       • pool: A mongoc_client_pool_t.

       A mongoc_client_t.

          mongoc_client_t *
          mongoc_client_pool_pop (mongoc_client_pool_t *pool);

       Retrieve  a  mongoc_client_t from the client pool, or create one. The total number of clients that can be
       created from this pool is limited by the URI option "maxPoolSize", default 100. If this number of clients
       has been created and all are in use, mongoc_client_pool_pop blocks until another thread returns a  client
       with  mongoc_client_pool_push().  If  the  "waitQueueTimeoutMS"  URI option was specified with a positive
       value, then mongoc_client_pool_pop will return NULL when the timeout expires.

       The returned mongoc_client_t must be returned to the pool with mongoc_client_pool_push().

       NOTE:
          Return a checked out mongoc_client_t to the pool with mongoc_client_pool_push() quickly  to  encourage
          reuse of clients among threads.

       This function is safe to call from multiple threads.