[Openmp-commits] [openmp] ee1bf45 - [OpenMP][NFC] Added DeviceID and Event pointer to __tgt_async_info

[Shilei Tian via Openmp-commits]

Author: Shilei Tian
Date: 2020-06-17T14:29:09-04:00
New Revision: ee1bf45e1d42d7f386d8321c3a8799476344ad91

URL: https://github.com/llvm/llvm-project/commit/ee1bf45e1d42d7f386d8321c3a8799476344ad91
DIFF: https://github.com/llvm/llvm-project/commit/ee1bf45e1d42d7f386d8321c3a8799476344ad91.diff

LOG: [OpenMP][NFC] Added DeviceID and Event pointer to __tgt_async_info

DeviceID is added for some cases that we only have the __tgt_async_info but do
not know its corresponding device id. However, to communicate with target
plugins, we need that information.

Event is added for another way to synchronize.

Added: 
    

Modified: 
    openmp/libomptarget/include/omptarget.h

Removed: 
    


################################################################################
diff  --git a/openmp/libomptarget/include/omptarget.h b/openmp/libomptarget/include/omptarget.h
index de3afc36c7f2..7ba088c1996b 100644
--- a/openmp/libomptarget/include/omptarget.h
+++ b/openmp/libomptarget/include/omptarget.h
@@ -114,10 +114,14 @@ struct __tgt_target_table {
 /// This struct contains information exchanged between 
diff erent asynchronous
 /// operations for device-dependent optimization and potential synchronization
 struct __tgt_async_info {
+  // Device ID. Note that it is NOT the RTLDeviceID. We don't need to store the
+  // RTLDeviceID explicitly as we can always get it via DeviceID.
+  int DeviceID = -1;
   // A pointer to a queue-like structure where offloading operations are issued.
-  // We assume to use this structure to do synchronization. In CUDA backend, it
-  // is CUstream.
+  // We assume to use this structure to do synchronization.
   void *Queue = nullptr;
+  // A pointer to a device-dependent event used for synchronization as well.
+  void *Event = nullptr;
 };
 
 #ifdef __cplusplus