genode/repos/base/include/base/synced_allocator.h
Alexander Boettcher 3956530634 base: use Mutex/Blockade
Issue #3612
2020-04-17 12:40:12 +02:00

76 lines
1.9 KiB
C++

/*
* \brief Mutex-guarded allocator interface
* \author Norman Feske
* \author Stefan Kalkowski
* \date 2008-08-05
*/
/*
* Copyright (C) 2008-2020 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU Affero General Public License version 3.
*/
#ifndef _INCLUDE__BASE__SYNCED_ALLOCATOR_H_
#define _INCLUDE__BASE__SYNCED_ALLOCATOR_H_
#include <base/allocator.h>
#include <base/synced_interface.h>
namespace Genode {
template <typename> class Synced_allocator;
}
/**
* Mutex-guarded allocator
*
* This class wraps the complete 'Allocator' interface while
* preventing concurrent calls to the wrapped allocator implementation.
*
* \param ALLOC class implementing the 'Allocator' interface
*/
template <typename ALLOC>
class Genode::Synced_allocator : public Allocator
{
private:
Mutex _mutex { };
ALLOC _alloc;
Synced_interface<ALLOC, Mutex> _synced_object;
public:
using Guard = typename Synced_interface<ALLOC, Mutex>::Guard;
template <typename... ARGS>
Synced_allocator(ARGS &&... args)
: _alloc(args...), _synced_object(_mutex, &_alloc) { }
Guard operator () () { return _synced_object(); }
Guard operator () () const { return _synced_object(); }
/*************************
** Allocator interface **
*************************/
bool alloc(size_t size, void **out_addr) override {
return _synced_object()->alloc(size, out_addr); }
void free(void *addr, size_t size) override {
_synced_object()->free(addr, size); }
size_t consumed() const override {
return _synced_object()->consumed(); }
size_t overhead(size_t size) const override {
return _synced_object()->overhead(size); }
bool need_size_for_free() const override {
return _synced_object()->need_size_for_free(); }
};
#endif /* _INCLUDE__BASE__SYNCED_ALLOCATOR_H_ */