region.cpp
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/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
* Main authors:
* Christian Schulte <schulte@gecode.org>
*
* Copyright:
* Christian Schulte, 2008
*
* This file is part of Gecode, the generic constraint
* development environment:
* http://www.gecode.org
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*/
#include <gecode/kernel.hh>
namespace Gecode {
Region::Pool::Pool(void)
: c(new Chunk), n_c(2U) {
c->next = new Chunk; c->next->next = nullptr;
}
Region::Chunk*
Region::Pool::chunk(void) {
Chunk* n;
{
Support::Lock l(m);
if (c != nullptr) {
assert(n_c > 0U);
n = c; c = c->next; n_c--;
} else {
n = new Region::Chunk;
}
n->reset();
}
return n;
}
void
Region::Pool::chunk(Chunk* u) {
Support::Lock l(m);
if (n_c == Kernel::MemoryConfig::n_hc_cache) {
delete u;
} else {
u->next = c; c = u;
n_c++;
}
}
Region::Pool::~Pool(void) {
Support::Lock l(m);
// If that were the case there would be a memory leak!
assert(c != nullptr);
do {
Chunk* n=c->next;
delete c;
c=n;
} while (c != nullptr);
}
Region::Pool& Region::pool(void) {
static Region::Pool _p;
return _p;
}
void*
Region::heap_alloc(size_t s) {
void* p = heap.ralloc(s);
if (hi == nullptr) {
hi = p;
assert(!Support::marked(hi));
} else if (!Support::marked(hi)) {
HeapInfo* h = static_cast<HeapInfo*>
(heap.ralloc(sizeof(HeapInfo)+(4-1)*sizeof(void*)));
h->n=2; h->size=4;
h->blocks[0]=hi; h->blocks[1]=p;
hi = Support::mark(h);
} else {
HeapInfo* h = static_cast<HeapInfo*>(Support::unmark(hi));
if (h->n == h->size) {
HeapInfo* n = static_cast<HeapInfo*>
(heap.ralloc(sizeof(HeapInfo)+(2*h->n-1)*sizeof(void*)));
n->size = 2*h->n;
n->n = h->n;
memcpy(&n->blocks[0], &h->blocks[0], h->n*sizeof(void*));
hi = Support::mark(n);
heap.rfree(h);
h = n;
}
h->blocks[h->n++] = p;
}
return p;
}
void
Region::heap_free(void) {
assert(hi != nullptr);
if (Support::marked(hi)) {
HeapInfo* h = static_cast<HeapInfo*>(Support::unmark(hi));
for (unsigned int i=0U; i<h->n; i++)
heap.rfree(h->blocks[i]);
heap.rfree(h);
} else {
heap.rfree(hi);
}
}
}
// STATISTICS: kernel-memory
Gecode::ArgArrayBase::n
int n
Number of elements.
Definition array.hpp:540
Gecode::Heap::rfree
void rfree(void *p)
Free memory block starting at p.
Definition heap.hpp:371
Gecode::Heap::ralloc
void * ralloc(size_t s)
Allocate s bytes from heap.
Definition heap.hpp:357
Gecode::heap
Heap heap
The single global heap.
Definition heap.cpp:44
kernel.hh
Gecode
Gecode toplevel namespace
Test::Float::Arithmetic::c
Gecode::FloatVal c(-8, 8)
Test::Int::Basic::i
Gecode::IntArgs i({1, 2, 3, 4})