Tomcat example source code file (shm.c)

This example Tomcat source code file (shm.c) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Tomcat tags/keywords

j2p, j2p, null, p2j, shm, shm, tcn_alloc_cstring, tcn_free_cstring, tcn_implement_call, tcn_implement_call, tcn_throw_if_err, unreferenced, unreferenced_stdargs, unreferenced_stdargs

The Tomcat shm.c source code

/* Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.
 */

/*
 *
 * @author Mladen Turk
 * @version $Revision: 466585 $, $Date: 2006-10-22 00:16:34 +0200 (dim., 22 oct. 2006) $
 */
 
#include "tcn.h"
#include "apr_shm.h"

TCN_IMPLEMENT_CALL(jlong, Shm, create)(TCN_STDARGS, jlong reqsize,
                                       jstring filename,
                                       jlong pool)
{
    apr_pool_t *p = J2P(pool, apr_pool_t *);
    const char *fname = NULL;
    apr_shm_t *shm;


    UNREFERENCED(o);
    if (filename)
        fname = (const char *)((*e)->GetStringUTFChars(e, filename, 0));
    TCN_THROW_IF_ERR(apr_shm_create(&shm, (apr_size_t)reqsize,
                                    fname, p), shm);

cleanup:
    if (fname)
        (*e)->ReleaseStringUTFChars(e, filename, fname);
    return P2J(shm);
}

TCN_IMPLEMENT_CALL(jint, Shm, remove)(TCN_STDARGS,
                                      jstring filename,
                                      jlong pool)
{
    apr_status_t rv;
    apr_pool_t *p = J2P(pool, apr_pool_t *);
    TCN_ALLOC_CSTRING(filename);


    UNREFERENCED(o);
    rv = apr_shm_remove(J2S(filename), p);
    TCN_FREE_CSTRING(filename);

    return (jint)rv;
}

TCN_IMPLEMENT_CALL(jint, Shm, destroy)(TCN_STDARGS, jlong shm)
{
    apr_shm_t *s = J2P(shm, apr_shm_t *);

    UNREFERENCED_STDARGS;
    return (jint)apr_shm_destroy(s);
}

TCN_IMPLEMENT_CALL(jlong, Shm, attach)(TCN_STDARGS,
                                       jstring filename,
                                       jlong pool)
{
    apr_pool_t *p = J2P(pool, apr_pool_t *);
    const char *fname = NULL;
    apr_shm_t *shm;


    UNREFERENCED(o);
    if (filename)
        fname = (const char *)((*e)->GetStringUTFChars(e, filename, 0));
    TCN_THROW_IF_ERR(apr_shm_attach(&shm, fname, p), shm);

cleanup:
    if (fname)
        (*e)->ReleaseStringUTFChars(e, filename, fname);
    return P2J(shm);
}

TCN_IMPLEMENT_CALL(jint, Shm, detach)(TCN_STDARGS, jlong shm)
{
    apr_shm_t *s = J2P(shm, apr_shm_t *);

    UNREFERENCED_STDARGS;
    return (jint)apr_shm_detach(s);
}

TCN_IMPLEMENT_CALL(jlong, Shm, baseaddr)(TCN_STDARGS, jlong shm)
{
    apr_shm_t *s = J2P(shm, apr_shm_t *);

    UNREFERENCED_STDARGS;
    return P2J(apr_shm_baseaddr_get(s));
}

TCN_IMPLEMENT_CALL(jlong, Shm, size)(TCN_STDARGS, jlong shm)
{
    apr_shm_t *s = J2P(shm, apr_shm_t *);

    UNREFERENCED_STDARGS;
    return (jlong)apr_shm_size_get(s);
}

TCN_IMPLEMENT_CALL(jobject, Shm, buffer)(TCN_STDARGS, jlong shm)
{
    apr_shm_t *s = J2P(shm, apr_shm_t *);
    jlong sz = (jlong)apr_shm_size_get(s);
    void *a;

    UNREFERENCED(o);

    if ((a = apr_shm_baseaddr_get(s)) != NULL)
        return (*e)->NewDirectByteBuffer(e, a, sz);
    else
        return NULL;
}