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/*
* Copyright (C) 2012-2016 Robin Haberkorn
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*/
#ifndef __MEMORY_H
#define __MEMORY_H
#include <glib.h>
/**
* Default memory limit (500mb, assuming SI units).
*/
#define MEMORY_LIMIT_DEFAULT (500*1000*1000)
namespace SciTECO {
/**
* Common base class for all objects in SciTECO.
* This is currently only used to provide custom new/delete
* replacements in order to support unified allocation via
* Glib (g_malloc and g_slice) and as a memory usage
* counting fallback.
*
* This approach has certain drawbacks, e.g. you cannot
* derive from Object privately; nor is it possible to
* influence allocations in other libraries or even of
* scalars (e.g. new char[5]).
*
* C++14 (supported by GCC >= 5) has global sized delete
* replacements which would be effective in the entire application
* but we're still using the base-class approach since
* we must support the older compilers anyway.
*/
class Object {
public:
static void *operator new(size_t size) noexcept;
static inline void *
operator new[](size_t size) noexcept
{
return operator new(size);
}
static inline void *
operator new(size_t size, void *ptr) noexcept
{
return ptr;
}
static void operator delete(void *ptr, size_t size) noexcept;
static inline void
operator delete[](void *ptr, size_t size) noexcept
{
operator delete(ptr, size);
}
};
extern class MemoryLimit : public Object {
public:
/**
* Undo stack memory limit in bytes.
* 0 means no limiting.
*/
gsize limit;
MemoryLimit() : limit(MEMORY_LIMIT_DEFAULT) {}
gsize get_usage(void);
void set_limit(gsize new_limit = 0);
void check(void);
} memlimit;
} /* namespace SciTECO */
#endif
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