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/* Copyright (c) 2003, 2006, 2007 MySQL AB
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; version 2 of the License.
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 Street, Fifth Floor, Boston, MA 02110-1301, USA */
#include "RWPool.hpp"
#include <ndbd_exit_codes.h>
#include <NdbOut.hpp>
#define REC_NIL GLOBAL_PAGE_SIZE_WORDS
RWPool::RWPool()
{
bzero(this, sizeof(* this));
m_current_pos = RWPage::RWPAGE_WORDS;
m_current_first_free = REC_NIL;
m_first_free_page = RNIL;
}
void
RWPool::init(const Record_info& ri, const Pool_context& pc)
{
m_ctx = pc;
m_record_info = ri;
m_record_info.m_size = ((ri.m_size + 3) >> 2); // Align to word boundary
m_record_info.m_offset_magic = ((ri.m_offset_magic + 3) >> 2);
m_record_info.m_offset_next_pool = ((ri.m_offset_next_pool + 3) >> 2);
m_memroot = (RWPage*)m_ctx.get_memroot();
ndbout_c("RWPool::init(%x, %d)",ri.m_type_id, m_record_info.m_size);
}
bool
RWPool::seize(Ptr<void>& ptr)
{
Uint32 pos = m_current_pos;
Uint32 size = m_record_info.m_size;
Uint32 off = m_record_info.m_offset_magic;
RWPage *pageP = m_current_page;
if (likely(m_current_first_free != REC_NIL))
{
seize_free:
pos = m_current_first_free;
ptr.i = (m_current_page_no << POOL_RECORD_BITS) + pos;
ptr.p = pageP->m_data + pos;
pageP->m_data[pos+off] = ~(Uint32)m_record_info.m_type_id;
m_current_ref_count++;
m_current_first_free = pageP->m_data[pos+m_record_info.m_offset_next_pool];
return true;
}
else if (pos + size < RWPage::RWPAGE_WORDS)
{
seize_first:
ptr.i = (m_current_page_no << POOL_RECORD_BITS) + pos;
ptr.p = (pageP->m_data + pos);
pageP->m_data[pos+off] = ~(Uint32)m_record_info.m_type_id;
m_current_ref_count++;
m_current_pos = pos + size;
return true;
}
if (m_current_page)
{
m_current_page->m_first_free = REC_NIL;
m_current_page->m_next_page = RNIL;
m_current_page->m_prev_page = RNIL;
m_current_page->m_type_id = m_record_info.m_type_id;
m_current_page->m_ref_count = m_current_ref_count;
}
if (m_first_free_page != RNIL)
{
pageP = m_current_page = m_memroot + m_first_free_page;
m_current_page_no = m_first_free_page;
m_current_pos = RWPage::RWPAGE_WORDS;
m_current_first_free = m_current_page->m_first_free;
m_first_free_page = m_current_page->m_next_page;
m_current_ref_count = m_current_page->m_ref_count;
if (m_first_free_page != RNIL)
{
(m_memroot + m_first_free_page)->m_prev_page = RNIL;
}
goto seize_free;
}
m_current_ref_count = 0;
RWPage* page;
Uint32 page_no = RNIL;
if ((page = (RWPage*)m_ctx.alloc_page(m_record_info.m_type_id, &page_no)))
{
pos = 0;
m_current_page_no = page_no;
pageP = m_current_page = page;
m_current_first_free = REC_NIL;
page->m_type_id = m_record_info.m_type_id;
goto seize_first;
}
m_current_page = 0;
m_current_page_no = RNIL;
m_current_pos = RWPage::RWPAGE_WORDS;
m_current_first_free = REC_NIL;
return false;
}
void
RWPool::release(Ptr<void> ptr)
{
Uint32 cur_page = m_current_page_no;
Uint32 ptr_page = ptr.i >> POOL_RECORD_BITS;
Uint32 *record_ptr = (Uint32*)ptr.p;
Uint32 magic_val = * (record_ptr + m_record_info.m_offset_magic);
if (likely(magic_val == ~(Uint32)m_record_info.m_type_id))
{
* (record_ptr + m_record_info.m_offset_magic) = 0;
if (cur_page == ptr_page)
{
* (record_ptr + m_record_info.m_offset_next_pool) = m_current_first_free;
assert(m_current_ref_count);
m_current_ref_count--;
m_current_first_free = ptr.i & POOL_RECORD_MASK;
return;
}
// Cache miss on page...
RWPage* page = m_memroot + ptr_page;
Uint32 ref_cnt = page->m_ref_count;
Uint32 ff = page->m_first_free;
* (record_ptr + m_record_info.m_offset_next_pool) = ff;
page->m_first_free = ptr.i & POOL_RECORD_MASK;
page->m_ref_count = ref_cnt - 1;
if (ff == REC_NIL)
{
/**
* It was full...add to free page list
*/
Uint32 ffp = m_first_free_page;
if (ffp != RNIL)
{
RWPage* next = (m_memroot + ffp);
assert(next->m_prev_page == RNIL);
next->m_prev_page = ptr_page;
}
page->m_next_page = ffp;
page->m_prev_page = RNIL;
m_first_free_page = ptr_page;
return;
}
else if(ref_cnt == 1)
{
/**
* It's now empty...release it
*/
Uint32 prev = page->m_prev_page;
Uint32 next = page->m_next_page;
if (prev != RNIL)
{
(m_memroot + prev)->m_next_page = next;
}
else
{
assert(m_first_free_page == ptr_page);
m_first_free_page = next;
}
if (next != RNIL)
{
(m_memroot + next)->m_prev_page = prev;
}
m_ctx.release_page(m_record_info.m_type_id, ptr_page);
return;
}
return;
}
handle_invalid_release(ptr);
}
void
RWPool::handle_invalid_release(Ptr<void> ptr)
{
char buf[255];
Uint32 pos = ptr.i & POOL_RECORD_MASK;
Uint32 pageI = ptr.i >> POOL_RECORD_BITS;
Uint32 * record_ptr_p = (Uint32*)ptr.p;
Uint32 * record_ptr_i = (m_memroot+pageI)->m_data + pos;
Uint32 magic = * (record_ptr_p + m_record_info.m_offset_magic);
snprintf(buf, sizeof(buf),
"Invalid memory release: ptr (%x %p %p) magic: (%.8x %.8x) memroot: %p page: %x",
ptr.i, ptr.p, record_ptr_i, magic, m_record_info.m_type_id,
m_memroot,
(m_memroot+pageI)->m_type_id);
m_ctx.handleAbort(NDBD_EXIT_PRGERR, buf);
}
void
RWPool::handle_invalid_get_ptr(Uint32 ptrI)
{
char buf[255];
Uint32 pos = ptrI & POOL_RECORD_MASK;
Uint32 pageI = ptrI >> POOL_RECORD_BITS;
Uint32 * record_ptr_i = (m_memroot+pageI)->m_data + pos;
Uint32 magic = * (record_ptr_i + m_record_info.m_offset_magic);
snprintf(buf, sizeof(buf),
"Invalid memory access: ptr (%x %p) magic: (%.8x %.8x) memroot: %p page: %x",
ptrI, record_ptr_i, magic, m_record_info.m_type_id,
m_memroot,
(m_memroot+pageI)->m_type_id);
m_ctx.handleAbort(NDBD_EXIT_PRGERR, buf);
}
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