Function ap_set_mutex

server/util_mutex.c:164–252

}

AP_DECLARE_NONSTD(const char *)ap_set_mutex(cmd_parms *cmd, void *dummy,
                                            const char *arg)
{
    apr_pool_t *p = cmd->pool;
    apr_pool_t *ptemp = cmd->temp_pool;
    const char **elt;
    const char *mechdir;
    int no_mutex = 0, omit_pid = 0;
    apr_array_header_t *type_list;
    apr_lockmech_e mech;
    apr_status_t rv;
    const char *mutexdir;
    mutex_cfg_t *mxcfg;
    const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);

    if (err != NULL) {
        return err;
    }

    mechdir = ap_getword_conf(cmd->pool, &arg);
    if (*mechdir == '\0') {
        return "Mutex requires at least a mechanism argument ("
               AP_ALL_AVAILABLE_MUTEXES_STRING ")";
    }

    rv = ap_parse_mutex(mechdir, p, &mech, &mutexdir);
    if (rv == APR_ENOTIMPL) {
        return apr_pstrcat(p, "Invalid Mutex argument ", mechdir,
                           " (" AP_ALL_AVAILABLE_MUTEXES_STRING ")", NULL);
    }
    else if (rv == APR_BADARG
             || (mutexdir && !ap_is_directory(ptemp, mutexdir))) {
        return apr_pstrcat(p, "Invalid Mutex directory in argument ",
                           mechdir, NULL);
    }
    else if (rv == APR_ENOLOCK) { /* "none" */
        no_mutex = 1;
    }

    /* "OmitPID" can appear at the end of the list, so build a list of
     * mutex type names while looking for "OmitPID" (anywhere) or the end
     */
    type_list = apr_array_make(cmd->pool, 4, sizeof(const char *));
    while (*arg) {
        const char *s = ap_getword_conf(cmd->pool, &arg);

        if (!strcasecmp(s, "omitpid")) {
            omit_pid = 1;
        }
        else {
            const char **new_type = (const char **)apr_array_push(type_list);
            *new_type = s;
        }
    }

    if (apr_is_empty_array(type_list)) { /* no mutex type?  assume "default" */
        const char **new_type = (const char **)apr_array_push(type_list);
        *new_type = "default";