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/*
* Copyright (c) 2022, kleines Filmröllchen <filmroellchen@serenityos.org>.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Forward.h>
#include <AK/Noncopyable.h>
#if defined(KERNEL)
# include <Kernel/Arch/Processor.h>
# include <Kernel/Heap/kmalloc.h>
#else
# include <LibC/mallocdefs.h>
#endif
namespace AK {
class NoAllocationGuard {
AK_MAKE_NONCOPYABLE(NoAllocationGuard);
AK_MAKE_NONMOVABLE(NoAllocationGuard);
public:
NoAllocationGuard()
: m_allocation_enabled_previously(get_thread_allocation_state())
{
set_thread_allocation_state(false);
}
~NoAllocationGuard()
{
set_thread_allocation_state(m_allocation_enabled_previously);
}
private:
static bool get_thread_allocation_state()
{
#if defined(KERNEL)
return Processor::current_thread()->get_allocation_enabled();
#elif defined(AK_OS_SERENITY)
// This extern thread-local lives in our LibC, which doesn't exist on other systems.
return s_allocation_enabled;
#else
return true;
#endif
}
static void set_thread_allocation_state(bool value)
{
#if defined(KERNEL)
Processor::current_thread()->set_allocation_enabled(value);
#elif defined(AK_OS_SERENITY)
s_allocation_enabled = value;
#else
(void)value;
#endif
}
bool m_allocation_enabled_previously { true };
};
}
#if USING_AK_GLOBALLY
using AK::NoAllocationGuard;
#endif
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