test_conformance/events/test_userevents_multithreaded.cpp

//
// Copyright (c) 2017 The Khronos Group Inc.
// 
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//    http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
#include "testBase.h"
#include "action_classes.h"
#include "harness/conversions.h"

#include <thread>

#if !defined (_MSC_VER)
    #include <unistd.h>
#endif // !_MSC_VER

void trigger_user_event(cl_event *event)
{
    usleep(1000000);
    log_info("\tTriggering gate from separate thread...\n");
    clSetUserEventStatus(*event, CL_COMPLETE);
}

int test_userevents_multithreaded( cl_device_id deviceID, cl_context context, cl_command_queue queue, int num_elements )
{
    cl_int error;


    // Set up a user event to act as a gate
    clEventWrapper gateEvent = clCreateUserEvent( context, &error );
    test_error( error, "Unable to create user gate event" );

    // Set up a few actions gated on the user event
    NDRangeKernelAction action1;
    ReadBufferAction action2;
    WriteBufferAction action3;

    clEventWrapper actionEvents[ 3 ];
    Action * actions[] = { &action1, &action2, &action3, NULL };

    for( int i = 0; actions[ i ] != NULL; i++ )
    {
        error = actions[ i ]->Setup( deviceID, context, queue );
        test_error( error, "Unable to set up test action" );

        error = actions[ i ]->Execute( queue, 1, &gateEvent, &actionEvents[ i ] );
        test_error( error, "Unable to execute test action" );
    }

    // Now, instead of releasing the gate, we spawn a separate thread to do so
    log_info( "\tStarting trigger thread...\n" );
    std::thread thread(trigger_user_event, &gateEvent);

    log_info( "\tWaiting for actions...\n" );
    error = clWaitForEvents( 3, &actionEvents[ 0 ] );
    test_error( error, "Unable to wait for action events" );

    thread.join();
    log_info( "\tActions completed.\n" );

    // If we got here without error, we're good
    return 0;
}