| //===------ counter_group.h - NVPTX OpenMP loop scheduling ------- CUDA -*-===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is dual licensed under the MIT and the University of Illinois Open |
| // Source Licenses. See LICENSE.txt for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // Interface to implement OpenMP loop scheduling |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef _OMPTARGET_NVPTX_COUNTER_GROUP_H_ |
| #define _OMPTARGET_NVPTX_COUNTER_GROUP_H_ |
| |
| #include "option.h" |
| |
| // counter group type for synchronizations |
| class omptarget_nvptx_CounterGroup { |
| public: |
| // getters and setters |
| INLINE Counter &Event() { return v_event; } |
| INLINE volatile Counter &Start() { return v_start; } |
| INLINE Counter &Init() { return v_init; } |
| |
| // Synchronization Interface |
| |
| INLINE void Clear(); // first time start=event |
| INLINE void Reset(); // init = first |
| INLINE void Init(Counter &priv); // priv = init |
| INLINE Counter Next(); // just counts number of events |
| |
| // set priv to n, to be used in later waitOrRelease |
| INLINE void Complete(Counter &priv, Counter n); |
| |
| // check priv and decide if we have to wait or can free the other warps |
| INLINE void Release(Counter priv, Counter current_event_value); |
| INLINE void WaitOrRelease(Counter priv, Counter current_event_value); |
| |
| private: |
| Counter v_event; // counter of events (atomic) |
| |
| // volatile is needed to force loads to read from global |
| // memory or L2 cache and see the write by the last master |
| volatile Counter v_start; // signal when events registered are finished |
| |
| Counter v_init; // used to initialize local thread variables |
| }; |
| |
| #endif /* SRC_COUNTER_GROUP_H_ */ |
