pcsx2/common/include/Utilities/General.h

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/* PCSX2 - PS2 Emulator for PCs
* Copyright (C) 2002-2009 PCSX2 Dev Team
*
* PCSX2 is free software: you can redistribute it and/or modify it under the terms
* of the GNU Lesser General Public License as published by the Free Software Found-
* ation, either version 3 of the License, or (at your option) any later version.
*
* PCSX2 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 PCSX2.
* If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
// ----------------------------------------------------------------------------------------
// RecursionGuard - Basic protection against function recursion
// ----------------------------------------------------------------------------------------
// Thread safety note: If used in a threaded environment, you shoud use a handle to a __threadlocal
// storage variable (protects aaginst race conditions and, in *most* cases, is more desirable
// behavior as well.
//
// Rationale: wxWidgets has its own wxRecursionGuard, but it has a sloppy implementation with
// entirely unnecessary assertion checks.
//
class RecursionGuard
{
public:
int& Counter;
RecursionGuard( int& counter ) : Counter( counter )
{ ++Counter; }
virtual ~RecursionGuard() throw()
{ --Counter; }
bool IsReentrant() const { return Counter > 1; }
};
enum PageProtectionMode
{
Protect_NoAccess = 0,
Protect_ReadOnly,
Protect_ReadWrite
};
//////////////////////////////////////////////////////////////////////////////////////////
// HostSys - Namespace housing general system-level implementations relating to loading
// plugins and allocating memory. For now, these functions are all accessed via Sys*
// versions defined in System.h/cpp.
//
namespace HostSys
{
// Maps a block of memory for use as a recompiled code buffer.
// The allocated block has code execution privileges.
// Returns NULL on allocation failure.
extern void *Mmap(uptr base, u32 size);
// Unmaps a block allocated by SysMmap
extern void Munmap(uptr base, u32 size);
extern void MemProtect( void* baseaddr, size_t size, PageProtectionMode mode, bool allowExecution=false );
extern void Munmap( void* base, u32 size );
template< uint size >
void MemProtectStatic( u8 (&arr)[size], PageProtectionMode mode, bool allowExecution=false )
{
MemProtect( arr, size, mode, allowExecution );
}
}
//////////////////////////////////////////////////////////////////////////////////////////
extern void InitCPUTicks();
extern u64 GetTickFrequency();
extern u64 GetCPUTicks();
extern wxString GetOSVersionString();