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/* $Id: hdrl_buffer.c,v 1.1 2013-10-23 09:13:56 jtaylor Exp $
*
* This file is part of the HDRL
* Copyright (C) 2013,2014,2015 European Southern Observatory
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
/*-----------------------------------------------------------------------------
Includes
-----------------------------------------------------------------------------*/
#ifndef _POSIX_C_SOURCE
#define _POSIX_C_SOURCE 200112L /* posix_fallocate, ftruncate */
/* posix 2001 not enough for ftruncate on glibc 2.12 (SL6.3) */
#define _XOPEN_SOURCE 600
#endif
#include "hdrl_buffer.h"
#include "hdrl_types.h"
#include "hdrl_utils.h"
#include <cpl.h>
#include <cxlist.h>
#include <unistd.h>
#include <stdint.h>
#include <stdlib.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <fcntl.h>
#include <string.h>
/*-----------------------------------------------------------------------------
Functions
-----------------------------------------------------------------------------*/
static int hdrl_fallocate(int fd, off_t offset, off_t len)
{
#ifdef __APPLE__
/* could be improved via fcntl(fd, F_PREALLOCATE, ...); */
return ftruncate(fd, offset + len);
#else
return posix_fallocate(fd, offset, len);
#endif
}
static const size_t hdrl_pool_minsize = 2<<20;
struct _hdrl_buffer_ {
cx_list * pools;
cx_list * freelist;
size_t pool_size;
size_t total_size;
size_t malloc_thresh;
};
typedef struct {
char * base;
char * free_offset;
size_t size;
hdrl_free * destructor;
} hdrl_pool_base;
typedef struct {
hdrl_pool_base p;
int fd;
} hdrl_pool_mmap;
typedef struct {
hdrl_pool_base p;
} hdrl_pool_malloc;
typedef hdrl_pool_base hdrl_pool;
static void hdrl_pool_mmap_delete(void * pool)
{
if (!pool)
return;
hdrl_pool_mmap * p = pool;
/* truncate temp file to stop writeback of dirty pages */
if (ftruncate(p->fd, 0)) {}
munmap(p->p.base, p->p.size);
close(p->fd);
}
static hdrl_pool * hdrl_pool_mmap_new(size_t pool_size)
{
hdrl_pool_mmap * pool = cpl_malloc(sizeof(*pool));
pool_size = CX_MAX(pool_size, hdrl_pool_minsize);
pool->p.destructor = &hdrl_pool_mmap_delete;
/* Current working directory */
char *cwd = hdrl_get_cwd();
int cwd_fd = hdrl_get_tempfile(cwd, CPL_TRUE);
cpl_free(cwd);
/* Allocate TMPDIR first as it usually is a fast disk */
int tmp_fd = hdrl_get_tempfile(NULL, CPL_TRUE);
if (hdrl_fallocate(tmp_fd, 0, pool_size) != 0) {
close(tmp_fd);
if (hdrl_fallocate(cwd_fd, 0, pool_size) != 0) {
close(cwd_fd);
cpl_free(pool);
cpl_error_set_message(cpl_func, CPL_ERROR_FILE_IO,
"Allocation of %zu bytes failed", pool_size);
return NULL;
} else {
pool->fd = cwd_fd;
}
} else {
pool->fd = tmp_fd;
}
pool->p.base = mmap(NULL, pool_size, PROT_READ | PROT_WRITE, MAP_SHARED,
pool->fd, 0);
if (pool->p.base == MAP_FAILED) {
close(pool->fd);
cpl_free(pool);
cpl_error_set_message(cpl_func, CPL_ERROR_FILE_IO,
"Allocation of %zu bytes failed", pool_size);
return NULL;
}
pool->p.size = pool_size;
pool->p.free_offset = pool->p.base;
cpl_msg_debug(cpl_func, "Creating mmap pool %p of size %zu",
(const void*)pool, pool_size);
return (hdrl_pool*)pool;
}
static void hdrl_pool_malloc_delete(void * pool)
{
if (!pool)
return;
cpl_free(((hdrl_pool*)pool)->base);
}
static hdrl_pool * hdrl_pool_malloc_new(size_t pool_size)
{
hdrl_pool_mmap * pool = cpl_malloc(sizeof(*pool));
pool->p.size = CX_MAX(pool_size, hdrl_pool_minsize);
pool->p.destructor = &hdrl_pool_malloc_delete;
pool->p.base = cpl_malloc(pool_size);
pool->p.free_offset = pool->p.base;
cpl_msg_debug(cpl_func, "Creating malloc pool %p of size %zu",
(const void*)pool, pool_size);
return (hdrl_pool*)pool;
}
static void hdrl_pool_delete(hdrl_pool * pool)
{
if (!pool) {
return;
}
cpl_msg_debug(cpl_func, "Deleting pool %p", (const void*)pool);
pool->destructor(pool);
cpl_free(pool);
}
static size_t hdrl_pool_available(hdrl_pool * p)
{
return (p->base + p->size - p->free_offset);
}
static char * hdrl_pool_alloc(hdrl_pool * p, size_t n)
{
if (hdrl_pool_available(p) < n) {
return NULL;
}
char * b = p->free_offset;
p->free_offset += n;
cpl_msg_debug(cpl_func, "Allocating %zu from pool of size %zu (%zu)",
n, p->size, hdrl_pool_available(p));
return b;
}
static hdrl_pool * hdrl_pool_get_from_ptr(char * HDRL_UNUSED(p))
{
return NULL;
}
/* ---------------------------------------------------------------------------*/
/**
* @brief Create buffer object
* @param pool_size size of each memory pool
* @return buffer object useable to obtain memory mapped memory
*/
/* ---------------------------------------------------------------------------*/
hdrl_buffer * hdrl_buffer_new(void)
{
/* TODO pool_size probably does not need to be in api */
hdrl_buffer * buf = cpl_malloc(sizeof(*buf));
buf->pools = cx_list_new();
buf->freelist = cx_list_new();
buf->pool_size = 128ul * (1ul << 20ul);
buf->total_size = 0;
buf->malloc_thresh = 0;
return buf;
}
/* ---------------------------------------------------------------------------*/
/**
* @brief set total amount of memory the buffer can malloc
*
* @param buf buffer object
* @param t amount of memory in MiB
*
* @return old amount in wMiB
* @note changing threshold will only affect future allocation
*/
/* ---------------------------------------------------------------------------*/
size_t hdrl_buffer_set_malloc_threshold(hdrl_buffer * buf, size_t t)
{
size_t o = buf->malloc_thresh;
buf->malloc_thresh = t * (1ul << 20ul);
return o;
}
void hdrl_buffer_readonly(hdrl_buffer * buf, cpl_boolean ro)
{
/* TODO page alignment for malloc pool */
for (cx_list_iterator it = cx_list_begin(buf->pools);
it != cx_list_end(buf->pools);
it = cx_list_next(buf->pools, it)) {
hdrl_pool * pool = cx_list_get(buf->pools, it);
if (ro) {
mprotect(pool->base, pool->size, PROT_READ);
}
else {
mprotect(pool->base, pool->size, PROT_READ | PROT_WRITE);
}
}
}
/* ---------------------------------------------------------------------------*/
/**
* @brief Allocate memory block from buffer
*
* @param buf buffer object
* @param size size of memory to allocate
*
* @return writable memory block, or NULL on failure
*/
/* ---------------------------------------------------------------------------*/
char * hdrl_buffer_allocate(hdrl_buffer * buf, size_t size)
{
hdrl_pool * p = NULL;
char * m;
for (cx_list_iterator it = cx_list_begin(buf->freelist);
it != cx_list_end(buf->freelist);
it = cx_list_next(buf->freelist, it)) {
hdrl_pool * _p = cx_list_get(buf->freelist, it);
if (hdrl_pool_available(_p) >= size) {
p = _p;
cpl_msg_debug(cpl_func, "Found free available in pool.");
break;
}
}
if (p == NULL) {
/* no free pool, clear freelist (TODO clear full pools earlier) */
cx_list_empty(buf->freelist);
if (buf->total_size + size < buf->malloc_thresh ||
getenv("HDRL_BUFFER_MALLOC")) {
p = hdrl_pool_malloc_new(CX_MAX(size, buf->pool_size));
}
else {
p = hdrl_pool_mmap_new(CX_MAX(size, buf->pool_size));
}
cx_list_push_back(buf->pools, p);
/* add new pool to freelist if it has free available left */
if (size < buf->pool_size / 2) {
cx_list_push_back(buf->freelist, p);
}
}
m = hdrl_pool_alloc(p, size);
buf->total_size += size;
return m;
}
void hdrl_buffer_free(hdrl_buffer * HDRL_UNUSED(buf), char * p)
{
hdrl_pool * pool = hdrl_pool_get_from_ptr(p);
if (pool) {}
/* TODO add free, only from top of pool should be simple,
* MADV_DONTNEED may be enough */
}
/* ---------------------------------------------------------------------------*/
/**
* @brief delete buffer
* @param buf buffer
*
* Invalidates memory of all objects contained in the buffer
*/
/* ---------------------------------------------------------------------------*/
void hdrl_buffer_delete(hdrl_buffer * buf)
{
if (!buf) {
return;
}
cpl_msg_debug(cpl_func, "Deleting buffer with %zu pools",
cx_list_size(buf->pools));
cx_list_destroy(buf->pools, (hdrl_free*)&hdrl_pool_delete);
cx_list_delete(buf->freelist);
cpl_free(buf);
}
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