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/usr/include/apache2/modperl_interp.h is in libapache2-mod-perl2-dev 2.0.9-4ubuntu1.2.

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The actual contents of the file can be viewed below.

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/* 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.
 */

#ifndef MODPERL_INTERP_H
#define MODPERL_INTERP_H

void modperl_interp_init(server_rec *s, apr_pool_t *p,
                         PerlInterpreter *perl);

apr_status_t modperl_interp_cleanup(void *data);

#ifdef USE_ITHREADS

modperl_interp_t *modperl_thx_interp_get(PerlInterpreter *thx);
void modperl_thx_interp_set(PerlInterpreter *thx, modperl_interp_t *interp);

void modperl_interp_clone_init(modperl_interp_t *interp);

modperl_interp_t *modperl_interp_new(modperl_interp_pool_t *mip,
                                     PerlInterpreter *perl);

void modperl_interp_destroy(modperl_interp_t *interp);

modperl_interp_t *modperl_interp_get(server_rec *s);

apr_status_t modperl_interp_unselect(void *data);

modperl_interp_t *modperl_interp_pool_get(apr_pool_t *p);

void modperl_interp_pool_set(apr_pool_t *p,
                             modperl_interp_t *interp);

modperl_interp_t *modperl_interp_pool_select(apr_pool_t *p,
                                             server_rec *s);

modperl_interp_t *modperl_interp_select(request_rec *r, conn_rec *c,
                                        server_rec *s);

#define MP_dINTERP pTHX; modperl_interp_t *interp = NULL

#define MP_INTERPa(r, c, s)                                             \
    MP_TRACE_i(MP_FUNC, "selecting interp: r=%pp, c=%pp, s=%pp",        \
               (r), (c), (s));                                          \
    interp = modperl_interp_select((r), (c), (s));                      \
    if (interp) {                                                       \
        MP_TRACE_i(MP_FUNC, "  --> got (0x%pp)->refcnt=%d, perl=%pp",   \
                   interp, interp->refcnt, interp->perl);               \
        aTHX = interp->perl;                                            \
    }                                                                   \
    else {                                                              \
        aTHX = NULL;                                                    \
        MP_TRACE_i(MP_FUNC, "  --> failed");                            \
    }                                                                   \
    NOOP

#define MP_dINTERPa(r, c, s)                                            \
    MP_dINTERP;                                                         \
    MP_INTERPa((r), (c), (s))

#define MP_INTERP_POOLa(p, s)                                           \
    MP_TRACE_i(MP_FUNC, "selecting interp: p=%pp, s=%pp", (p), (s));    \
    interp = modperl_interp_pool_select((p), (s));                      \
    if (interp) {                                                       \
        MP_TRACE_i(MP_FUNC, "  --> got (0x%pp)->refcnt=%d",             \
                   interp, interp->refcnt);                             \
        aTHX = interp->perl;                                            \
    }                                                                   \
    else {                                                              \
        aTHX = NULL;                                                    \
        MP_TRACE_i(MP_FUNC, "  --> failed");                            \
    }                                                                   \
    NOOP

#define MP_dINTERP_POOLa(p, s)                                          \
    MP_dINTERP;                                                         \
    MP_INTERP_POOLa((p), (s))

#ifdef MP_DEBUG
#define MP_INTERP_PUTBACK(interp, thx)                                  \
    MP_TRACE_i(MP_FUNC, "unselecting interp: (0x%pp)->refcnt=%ld",      \
               (interp), (interp)->refcnt);                             \
    modperl_interp_unselect(interp);                                    \
    interp = NULL;                                                      \
    if( thx ) thx = NULL
#else  /* MP_DEBUG */
#define MP_INTERP_PUTBACK(interp, thx)                                  \
    modperl_interp_unselect(interp)
#endif

#define MP_INTERP_REFCNT_inc(interp) (interp)->refcnt++

#define MP_INTERP_REFCNT_dec(interp) MP_INTERP_PUTBACK(interp, NULL)

#define MP_HAS_INTERP(interp) (interp != NULL)

#define MP_aTHX aTHX

apr_status_t modperl_interp_pool_destroy(void *data);

typedef apr_status_t (*modperl_interp_mip_walker_t)(pTHX_
                                                    modperl_interp_pool_t *mip,
                                                    void *data);

void modperl_interp_mip_walk(PerlInterpreter *current_perl,
                             PerlInterpreter *parent_perl,
                             modperl_interp_pool_t *mip,
                             modperl_interp_mip_walker_t walker,
                             void *data);

void modperl_interp_mip_walk_servers(PerlInterpreter *current_perl,
                                     server_rec *base_server,
                                     modperl_interp_mip_walker_t walker,
                                     void *data);
#else

#define MP_dINTERP dNOOP

#define MP_INTERPa(r, c, s) NOOP

#define MP_dINTERPa(r, c, s) NOOP

#define MP_INTERP_POOLa(p, s) NOOP

#define MP_dINTERP_POOLa(p, s) NOOP

#define MP_INTERP_PUTBACK(interp, thx) NOOP

#define MP_INTERP_REFCNT_inc(interp) NOOP

#define MP_INTERP_REFCNT_dec(interp) NOOP

#define MP_HAS_INTERP(interp) (1)

#define MP_aTHX 0

#endif /* USE_ITHREADS */

#endif /* MODPERL_INTERP_H */

/*
 * Local Variables:
 * c-basic-offset: 4
 * indent-tabs-mode: nil
 * End:
 */