From e8ec7aa8e38a93f5b034ac74cebce5de23710317 Mon Sep 17 00:00:00 2001 From: hongbotian Date: Mon, 30 Nov 2015 01:45:08 -0500 Subject: upload http JIRA: BOTTLENECK-10 Change-Id: I7598427ff904df438ce77c2819ee48ac75ffa8da Signed-off-by: hongbotian --- .../srclib/apr-util/dbm/sdbm/sdbm_lock.c | 78 ++++++++++++++++++++++ 1 file changed, 78 insertions(+) create mode 100644 rubbos/app/httpd-2.0.64/srclib/apr-util/dbm/sdbm/sdbm_lock.c (limited to 'rubbos/app/httpd-2.0.64/srclib/apr-util/dbm/sdbm/sdbm_lock.c') diff --git a/rubbos/app/httpd-2.0.64/srclib/apr-util/dbm/sdbm/sdbm_lock.c b/rubbos/app/httpd-2.0.64/srclib/apr-util/dbm/sdbm/sdbm_lock.c new file mode 100644 index 00000000..a001ed41 --- /dev/null +++ b/rubbos/app/httpd-2.0.64/srclib/apr-util/dbm/sdbm/sdbm_lock.c @@ -0,0 +1,78 @@ +/* Copyright 2000-2005 The Apache Software Foundation or its licensors, as + * applicable. + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#include "apr_file_info.h" +#include "apr_file_io.h" +#include "apr_sdbm.h" + +#include "sdbm_private.h" +#include "sdbm_tune.h" + +/* NOTE: this function blocks until it acquires the lock */ +APU_DECLARE(apr_status_t) apr_sdbm_lock(apr_sdbm_t *db, int type) +{ + apr_status_t status; + + if (!(type == APR_FLOCK_SHARED || type == APR_FLOCK_EXCLUSIVE)) + return APR_EINVAL; + + if (db->flags & SDBM_EXCLUSIVE_LOCK) { + ++db->lckcnt; + return APR_SUCCESS; + } + else if (db->flags & SDBM_SHARED_LOCK) { + /* + * Cannot promote a shared lock to an exlusive lock + * in a cross-platform compatibile manner. + */ + if (type == APR_FLOCK_EXCLUSIVE) + return APR_EINVAL; + ++db->lckcnt; + return APR_SUCCESS; + } + /* + * zero size: either a fresh database, or one with a single, + * unsplit data page: dirpage is all zeros. + */ + if ((status = apr_file_lock(db->dirf, type)) == APR_SUCCESS) + { + apr_finfo_t finfo; + if ((status = apr_file_info_get(&finfo, APR_FINFO_SIZE, db->dirf)) + != APR_SUCCESS) { + (void) apr_file_unlock(db->dirf); + return status; + } + + SDBM_INVALIDATE_CACHE(db, finfo); + + ++db->lckcnt; + if (type == APR_FLOCK_SHARED) + db->flags |= SDBM_SHARED_LOCK; + else if (type == APR_FLOCK_EXCLUSIVE) + db->flags |= SDBM_EXCLUSIVE_LOCK; + } + return status; +} + +APU_DECLARE(apr_status_t) apr_sdbm_unlock(apr_sdbm_t *db) +{ + if (!(db->flags & (SDBM_SHARED_LOCK | SDBM_EXCLUSIVE_LOCK))) + return APR_EINVAL; + if (--db->lckcnt > 0) + return APR_SUCCESS; + db->flags &= ~(SDBM_SHARED_LOCK | SDBM_EXCLUSIVE_LOCK); + return apr_file_unlock(db->dirf); +} -- cgit 1.2.3-korg