Optimized Data Transfers Based on the OpenCL Event Management Mechanism

Listing 6

A simple pseudocode of a clDataTransfer function.

()  cl_int clDataTransferFunc( …,

()                cl_uint numevts,      /* the number of events in the list */

()                cl_event* wlist,      /* event list */

()                cl_evett* evtret )    /* event object of event object */

()  {

()   /* create a new user event object whose status is CL_SUBMITTED */

()   *evtret = clCreateUserEvent(…);

()

()   if( non_blocking = CL_TRUE)

()  pthread_create(…,cldtThreadFunc,…);

() else

()  cldtThreadFunc(…);

()

() return CL_SUCCESS;

() }

()

() /* numevt, wlist, and evtret are passed from the caller */

() void* cldtThreadFunc(void* p)

() {

() clWaitForEvent(numevt, wlist);

()

() /* pipelined data transfer */

()

() clSetUserEventStatus(*evtret, CL_COMPLETE);

() return NULL;

() }