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/* ====================================================================
* Copyright (c) 1995-2000 The Apache Software Foundation. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the Apache Software Foundation
* for use in the Apache HTTP server project (http://www.apache.org/)."
*
* 4. The names "Apache Server" and "Apache Software Foundation" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache"
* nor may "Apache" appear in their names without prior written
* permission of the Apache Software Foundation.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the Apache Software Foundation
* for use in the Apache HTTP server project (http://www.apache.org/)."
*
* THIS SOFTWARE IS PROVIDED BY THE Apache Software Foundation ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE Apache Software Foundation OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation and was originally based
* on public domain software written at the National Center for
* Supercomputing Applications, University of Illinois, Urbana-Champaign.
* For more information on the Apache Software Foundation and the Apache HTTP server
* project, please see <http://www.apache.org/>.
*
*/
#ifndef ap_POOLS_H
#define ap_POOLS_H
#ifdef __cplusplus
extern "C" {
#endif
/*
* Resource allocation routines...
*
* designed so that we don't have to keep track of EVERYTHING so that
* it can be explicitly freed later (a fundamentally unsound strategy ---
* particularly in the presence of die()).
*
* Instead, we maintain pools, and allocate items (both memory and I/O
* handlers) from the pools --- currently there are two, one for per
* transaction info, and one for config info. When a transaction is over,
* we can delete everything in the per-transaction ap_context_t without fear, and
* without thinking too hard about it either.
*
* rst
*/
/* Arenas for configuration info and transaction info
* --- actual layout of the ap_context_t structure is private to
* alloc.c.
*/
#include "apr_lib.h"
#if APR_HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
struct process_chain {
ap_proc_t *pid;
enum kill_conditions kill_how;
struct process_chain *next;
};
struct ap_pool_t {
union block_hdr *first;
union block_hdr *last;
struct cleanup *cleanups;
struct process_chain *subprocesses;
ap_pool_t *sub_pools;
ap_pool_t *sub_next;
ap_pool_t *sub_prev;
ap_pool_t *parent;
char *free_first_avail;
#ifdef ALLOC_USE_MALLOC
void *allocation_list;
#endif
#ifdef POOL_DEBUG
ap_pool_t *joined;
#endif
};
struct ap_table_t {
/* This has to be first to promote backwards compatibility with
* older modules which cast a ap_table_t * to an ap_array_header_t *...
* they should use the table_elts() function for most of the
* cases they do this for.
*/
ap_array_header_t a;
#ifdef MAKE_TABLE_PROFILE
void *creator;
#endif
};
/*
* Tables. Implemented alist style, for now, though we try to keep
* it so that imposing a hash table structure on top in the future
* wouldn't be *too* hard...
*
* Note that key comparisons for these are case-insensitive, largely
* because that's what's appropriate and convenient everywhere they're
* currently being used...
*/
ap_status_t ap_init_alloc(void); /* Set up everything */
void ap_term_alloc(void); /* Tear down everything */
/* used to guarantee to the pool debugging code that the sub pool will not be
* destroyed before the parent pool
*/
#ifndef POOL_DEBUG
#ifdef ap_pool_join
#undef ap_pool_join
#endif /* ap_pool_join */
#define ap_pool_join(a,b)
#endif /* POOL_DEBUG */
/* Clearing out EVERYTHING in an pool... destroys any sub-pools */
/* Preparing for exec() --- close files, etc., but *don't* flush I/O
* buffers, *don't* wait for subprocesses, and *don't* free any memory.
*/
/* routines to allocate memory from an pool... */
API_EXPORT_NONSTD(char *) ap_psprintf(struct context_t *, const char *fmt, ...)
__attribute__((format(printf,2,3)));
/* array and alist management... keeping lists of things.
* Common enough to want common support code ...
*/
/* ap_array_pstrcat generates a new string from the ap_context_t containing
* the concatenated sequence of substrings referenced as elements within
* the array. The string will be empty if all substrings are empty or null,
* or if there are no elements in the array.
* If sep is non-NUL, it will be inserted between elements as a separator.
*/
/* copy_array copies the *entire* array. copy_array_hdr just copies
* the header, and arranges for the elements to be copied if (and only
* if) the code subsequently does a push or arraycat.
*/
/* Conceptually, ap_overlap_tables does this:
ap_array_header_t *barr = ap_table_elts(b);
ap_table_entry_t *belt = (ap_table_entry_t *)barr->elts;
int i;
for (i = 0; i < barr->nelts; ++i) {
if (flags & ap_OVERLAP_TABLES_MERGE) {
ap_table_mergen(a, belt[i].key, belt[i].val);
}
else {
ap_table_setn(a, belt[i].key, belt[i].val);
}
}
Except that it is more efficient (less space and cpu-time) especially
when b has many elements.
Notice the assumptions on the keys and values in b -- they must be
in an ancestor of a's pool. In practice b and a are usually from
the same pool.
*/
#define ap_OVERLAP_TABLES_SET (0)
#define ap_OVERLAP_TABLES_MERGE (1)
/* A set of flags which indicate places where the server should raise(SIGSTOP).
* This is useful for debugging, because you can then attach to that process
* with gdb and continue. This is important in cases where one_process
* debugging isn't possible.
*/
#define SIGSTOP_DETACH 1
#define SIGSTOP_MAKE_CHILD 2 #define SIGSTOP_SPAWN_CHILD 4
#define SIGSTOP_PIPED_LOG_SPAWN 8
#define SIGSTOP_CGI_CHILD 16
#ifdef DEBUG_SIGSTOP
extern int raise_sigstop_flags;
#define RAISE_SIGSTOP(x) do { \
if (raise_sigstop_flags & SIGSTOP_##x) raise(SIGSTOP);\
} while (0)
#else
#define RAISE_SIGSTOP(x)
#endif
#ifdef ULTRIX_BRAIN_DEATH
#define ap_fdopen(d,m) fdopen((d), (char *)(m))
#else
#define ap_fdopen(d,m) fdopen((d), (m))
#endif
/* XXX - the socket functions for pools should (and will) use APR sockets.
* This is temporary. */
#ifndef BEOS /* this really screws up BeOS R4.5 !! */
#define closesocket(s) close(s)
#endif
/* XXX: these know about the definition of struct ap_table_t in alloc.c. That
* definition is not here because it is supposed to be private, and by not
* placing it here we are able to get compile-time diagnostics from modules
* written which assume that a ap_table_t is the same as an ap_array_header_t. -djg
*/
#define ap_table_elts(t) ((ap_array_header_t *)(t))
#define ap_is_empty_table(t) (((t) == NULL)||(((ap_array_header_t *)(t))->nelts == 0))
/* magic numbers --- min free bytes to consider a free ap_context_t block useable,
* and the min amount to allocate if we have to go to malloc() */
#ifndef BLOCK_MINFREE
#define BLOCK_MINFREE 4096
#endif
#ifndef BLOCK_MINALLOC
#define BLOCK_MINALLOC 8192
#endif
/* Finally, some accounting */
API_EXPORT(long) ap_bytes_in_pool(ap_pool_t *p);
API_EXPORT(long) ap_bytes_in_free_blocks(void);
#ifdef __cplusplus
}
#endif
#endif /* !ap_POOLS_H */
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