diff options
Diffstat (limited to 'LibOVR/Src/Kernel/OVR_Lockless.h')
| -rw-r--r-- | LibOVR/Src/Kernel/OVR_Lockless.h | 18 |
1 files changed, 14 insertions, 4 deletions
diff --git a/LibOVR/Src/Kernel/OVR_Lockless.h b/LibOVR/Src/Kernel/OVR_Lockless.h index a12f824..72b6b31 100644 --- a/LibOVR/Src/Kernel/OVR_Lockless.h +++ b/LibOVR/Src/Kernel/OVR_Lockless.h @@ -1,6 +1,6 @@ /************************************************************************************ -PublicHeader: OVR.h +PublicHeader: OVR_Kernel.h Filename : OVR_Lockless.h Content : Lock-less classes for producer/consumer communication Created : November 9, 2013 @@ -42,12 +42,22 @@ namespace OVR { // necessarily getting every one that happens (vsync timing, SensorFusion updates). // // This is multiple consumer safe, but is currently only used with a single consumer. +// +// The SlotType can be the same as T, but should probably be a larger fixed size. +// This allows for forward compatibility when the updater is shared between processes. + +// FIXME: ExchangeAdd_Sync() should be replaced with a portable read-only primitive, +// so that the lockless pose state can be read-only on remote processes and to reduce +// false sharing between processes and improve performance. -template<class T> +template<class T, class SlotType> class LocklessUpdater { public: - LocklessUpdater() : UpdateBegin( 0 ), UpdateEnd( 0 ) {} + LocklessUpdater() : UpdateBegin( 0 ), UpdateEnd( 0 ) + { + OVR_COMPILER_ASSERT(sizeof(T) <= sizeof(SlotType)); + } T GetState() const { @@ -92,7 +102,7 @@ public: mutable AtomicInt<int> UpdateBegin; mutable AtomicInt<int> UpdateEnd; - T Slots[2]; + SlotType Slots[2]; }; |