oculus1
annotate libovr/Src/Kernel/OVR_Atomic.cpp @ 1:e2f9e4603129
added LibOVR and started a simple vr wrapper.
| author | John Tsiombikas <nuclear@member.fsf.org> |
|---|---|
| date | Sat, 14 Sep 2013 16:14:59 +0300 |
| parents | |
| children | b069a5c27388 |
| rev | line source |
|---|---|
| nuclear@1 | 1 /************************************************************************************ |
| nuclear@1 | 2 |
| nuclear@1 | 3 Filename : OVR_Atomic.cpp |
| nuclear@1 | 4 Content : Contains atomic operations and inline fastest locking |
| nuclear@1 | 5 functionality. Will contain #ifdefs for OS efficiency. |
| nuclear@1 | 6 Have non-thread-safe implementation if not available. |
| nuclear@1 | 7 Created : September 19, 2012 |
| nuclear@1 | 8 Notes : |
| nuclear@1 | 9 |
| nuclear@1 | 10 Copyright : Copyright 2012 Oculus VR, Inc. All Rights reserved. |
| nuclear@1 | 11 |
| nuclear@1 | 12 Use of this software is subject to the terms of the Oculus license |
| nuclear@1 | 13 agreement provided at the time of installation or download, or which |
| nuclear@1 | 14 otherwise accompanies this software in either electronic or hard copy form. |
| nuclear@1 | 15 |
| nuclear@1 | 16 ************************************************************************************/ |
| nuclear@1 | 17 |
| nuclear@1 | 18 #include "OVR_Atomic.h" |
| nuclear@1 | 19 |
| nuclear@1 | 20 #ifdef OVR_ENABLE_THREADS |
| nuclear@1 | 21 |
| nuclear@1 | 22 // Include Windows 8-Metro compatible Synchronization API |
| nuclear@1 | 23 #if defined(OVR_OS_WIN32) && defined(NTDDI_WIN8) && (NTDDI_VERSION >= NTDDI_WIN8) |
| nuclear@1 | 24 #include <synchapi.h> |
| nuclear@1 | 25 #endif |
| nuclear@1 | 26 |
| nuclear@1 | 27 |
| nuclear@1 | 28 namespace OVR { |
| nuclear@1 | 29 |
| nuclear@1 | 30 // ***** Windows Lock implementation |
| nuclear@1 | 31 |
| nuclear@1 | 32 #if defined(OVR_OS_WIN32) |
| nuclear@1 | 33 |
| nuclear@1 | 34 // ***** Standard Win32 Lock implementation |
| nuclear@1 | 35 |
| nuclear@1 | 36 // Constructors |
| nuclear@1 | 37 Lock::Lock(unsigned spinCount) |
| nuclear@1 | 38 { |
| nuclear@1 | 39 #if defined(NTDDI_WIN8) && (NTDDI_VERSION >= NTDDI_WIN8) |
| nuclear@1 | 40 // On Windows 8 we use InitializeCriticalSectionEx due to Metro-Compatibility |
| nuclear@1 | 41 InitializeCriticalSectionEx(&cs, spinCount, |
| nuclear@1 | 42 OVR_DEBUG_SELECT(NULL, CRITICAL_SECTION_NO_DEBUG_INFO)); |
| nuclear@1 | 43 #else |
| nuclear@1 | 44 // Spin count init critical section function prototype for Window NT |
| nuclear@1 | 45 typedef BOOL (WINAPI *Function_InitializeCriticalSectionAndSpinCount) |
| nuclear@1 | 46 (LPCRITICAL_SECTION lpCriticalSection, DWORD dwSpinCount); |
| nuclear@1 | 47 |
| nuclear@1 | 48 |
| nuclear@1 | 49 // Try to load function dynamically so that we don't require NT |
| nuclear@1 | 50 // On Windows NT we will use InitializeCriticalSectionAndSpinCount |
| nuclear@1 | 51 static bool initTried = 0; |
| nuclear@1 | 52 static Function_InitializeCriticalSectionAndSpinCount pInitFn = 0; |
| nuclear@1 | 53 |
| nuclear@1 | 54 if (!initTried) |
| nuclear@1 | 55 { |
| nuclear@1 | 56 HMODULE hmodule = ::LoadLibrary(OVR_STR("kernel32.dll")); |
| nuclear@1 | 57 pInitFn = (Function_InitializeCriticalSectionAndSpinCount) |
| nuclear@1 | 58 ::GetProcAddress(hmodule, "InitializeCriticalSectionAndSpinCount"); |
| nuclear@1 | 59 initTried = true; |
| nuclear@1 | 60 } |
| nuclear@1 | 61 |
| nuclear@1 | 62 // Initialize the critical section |
| nuclear@1 | 63 if (pInitFn) |
| nuclear@1 | 64 pInitFn(&cs, spinCount); |
| nuclear@1 | 65 else |
| nuclear@1 | 66 ::InitializeCriticalSection(&cs); |
| nuclear@1 | 67 #endif |
| nuclear@1 | 68 |
| nuclear@1 | 69 } |
| nuclear@1 | 70 |
| nuclear@1 | 71 |
| nuclear@1 | 72 Lock::~Lock() |
| nuclear@1 | 73 { |
| nuclear@1 | 74 DeleteCriticalSection(&cs); |
| nuclear@1 | 75 } |
| nuclear@1 | 76 |
| nuclear@1 | 77 |
| nuclear@1 | 78 #endif |
| nuclear@1 | 79 |
| nuclear@1 | 80 } // OVR |
| nuclear@1 | 81 |
| nuclear@1 | 82 #endif // OVR_ENABLE_THREADS |