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janwas
a3696c0b91
lib/sysdep: clean up by moving OS and cpu-arch folders into "os" and "arch" folders This was SVN commit r6162.
115 lines
3.2 KiB
C++
115 lines
3.2 KiB
C++
/**
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* =========================================================================
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* File : wposix.cpp
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* Project : 0 A.D.
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* Description : emulate a subset of POSIX on Win32.
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* =========================================================================
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*/
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// license: GPL; see lib/license.txt
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#include "precompiled.h"
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#include "wposix.h"
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#include "wposix_internal.h"
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#include "lib/bits.h"
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WINIT_REGISTER_CRITICAL_INIT(wposix_Init); // wposix -> error handling
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//-----------------------------------------------------------------------------
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// sysconf
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// used by _SC_PAGESIZE and _SC_*_PAGES
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static DWORD pageSize;
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static DWORD numProcessors;
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typedef BOOL (WINAPI *PGlobalMemoryStatusEx)(MEMORYSTATUSEX*);
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static PGlobalMemoryStatusEx pGlobalMemoryStatusEx;
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// NB: called from critical init
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static void InitSysconf()
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{
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SYSTEM_INFO si;
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GetSystemInfo(&si); // can't fail
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pageSize = si.dwPageSize; // used by _SC_PAGESIZE and _SC_*_PAGES
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numProcessors = si.dwNumberOfProcessors;
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// import GlobalMemoryStatusEx - it's not defined by the VC6 PSDK.
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// used by _SC_*_PAGES if available (provides better results).
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const HMODULE hKernel32Dll = GetModuleHandle("kernel32.dll");
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pGlobalMemoryStatusEx = (PGlobalMemoryStatusEx)GetProcAddress(hKernel32Dll, "GlobalMemoryStatusEx");
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}
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long sysconf(int name)
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{
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// called before InitSysconf => winit/wstartup are broken. this is
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// going to cause a hard crash because debug.cpp's error reporting
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// code requires the page size to be known. we'll raise an exception
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// with a unique value so that this issue is immediately noticed.
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if(!pageSize)
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RaiseException(0xFA57FA57, 0, 0, 0);
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switch(name)
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{
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case _SC_PAGESIZE:
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// note: no separate case for _SC_PAGE_SIZE - they are
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// different names but have the same value.
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return pageSize;
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case _SC_PHYS_PAGES:
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case _SC_AVPHYS_PAGES:
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{
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u64 total_phys_mem;
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u64 avail_phys_mem;
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// first query GlobalMemoryStatus - cannot fail.
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// override its results if GlobalMemoryStatusEx is available.
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{
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MEMORYSTATUS ms;
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GlobalMemoryStatus(&ms);
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total_phys_mem = ms.dwTotalPhys;
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avail_phys_mem = ms.dwAvailPhys;
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}
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// newer API is available: use it to report correct results
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// (no overflow or wraparound) on systems with > 4 GB of memory.
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{
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MEMORYSTATUSEX mse = { sizeof(mse) };
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if(pGlobalMemoryStatusEx && pGlobalMemoryStatusEx(&mse))
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{
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total_phys_mem = mse.ullTotalPhys;
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avail_phys_mem = mse.ullAvailPhys;
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}
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// else: not an error, since this isn't available before Win2k / XP.
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// we have results from GlobalMemoryStatus anyway.
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}
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// Richter, "Programming Applications for Windows": the reported
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// value doesn't include non-paged pool reserved during boot;
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// it's not considered available to kernel. (size is 528 KiB on
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// a 512 MiB WinXP/Win2k machine)
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// something similar may happen on other OSes, so it is fixed
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// by cpu.cpp instead of here.
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if(name == _SC_PHYS_PAGES)
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return (long)(total_phys_mem / pageSize);
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else
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return (long)(avail_phys_mem / pageSize);
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}
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case _SC_NPROCESSORS_CONF:
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return numProcessors;
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default:
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return -1;
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}
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}
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//-----------------------------------------------------------------------------
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static LibError wposix_Init()
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{
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InitSysconf();
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return INFO::OK;
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}
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