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// Test hipEventIpc behavior.

#include <hip_test_checkers.hh>
#include <hip_test_kernels.hh>

#include <hip_test_common.hh>

/**
 * @addtogroup hipEventCreateWithFlags hipEventCreateWithFlags
 * @{
 * @ingroup EventTest
 */

/**
 * Test Description
 * ------------------------
 *  - Validate Event Management APIs when working with multiple processes.
 * Test source
 * ------------------------
 *  - unit/event/Unit_hipEventIpc.cc
 * Test requirements
 * ------------------------
 *  - HIP_VERSION >= 5.2
 */
TEST_CASE("Unit_hipEventIpc") {
    size_t N = 4 * 1024 * 1024;
    unsigned threadsPerBlock = 256;
    int iterations = 1;

    unsigned blocks = (N + threadsPerBlock - 1) / threadsPerBlock;
    if (blocks > 1024) blocks = 1024;
    if (blocks == 0) blocks = 1;

    printf("N=%zu (A+B+C= %6.1f MB total) blocks=%u threadsPerBlock=%u iterations=%d\n", N,
           ((double)3 * N * sizeof(float)) / 1024 / 1024, blocks, threadsPerBlock, iterations);
    printf("iterations=%d\n", iterations);

    size_t Nbytes = N * sizeof(float);

    float *A_h, *B_h, *C_h;
    float *A_d, *B_d, *C_d;
    HipTest::initArrays(&A_d, &B_d, &C_d, &A_h, &B_h, &C_h, N);

    hipEvent_t start, stop;

    // NULL stream check:
    HIP_CHECK(hipEventCreateWithFlags(&start, hipEventDisableTiming|hipEventInterprocess));
    HIP_CHECK(hipEventCreateWithFlags(&stop, hipEventDisableTiming|hipEventInterprocess));

    HIP_CHECK(hipMemcpy(A_d, A_h, Nbytes, hipMemcpyHostToDevice));
    HIP_CHECK(hipMemcpy(B_d, B_h, Nbytes, hipMemcpyHostToDevice));


    for (int i = 0; i < iterations; i++) {
        //--- START TIMED REGION
        long long hostStart = HipTest::get_time();
        // Record the start event
        HIP_CHECK(hipEventRecord(start, NULL));

        hipLaunchKernelGGL(HipTest::vectorADD, dim3(blocks), dim3(threadsPerBlock), 0, 0,
                        static_cast<const float*>(A_d), static_cast<const float*>(B_d), C_d, N);
        HIP_CHECK(hipGetLastError());

        HIP_CHECK(hipEventRecord(stop, NULL));
        HIP_CHECK(hipEventSynchronize(stop));
        HIP_CHECK(hipEventQuery(stop));
        long long hostStop = HipTest::get_time();
        //--- STOP TIMED REGION


        float eventMs = 1.0f;
        // should fail due to hipEventDisableTiming
        REQUIRE(hipSuccess != hipEventElapsedTime(&eventMs, start, stop));
        float hostMs = HipTest::elapsed_time(hostStart, hostStop);

        printf("host_time (chrono)                =%6.3fms\n", hostMs);
        printf("kernel_time (hipEventElapsedTime) =%6.3fms\n", eventMs);
        printf("\n");

    }

    hipIpcEventHandle_t ipc_handle;
    HIP_CHECK(hipIpcGetEventHandle(&ipc_handle, start));

    hipEvent_t ipc_event;
    hipError_t err = hipIpcOpenEventHandle(&ipc_event, ipc_handle);

    #if HT_WIN
    // always different process Id on Windows
    HIP_CHECK(err);
    #else
    // hipIpcOpenEventHandle() should be called in a different process, hence it should fail here
    REQUIRE(err == hipErrorInvalidContext);
    #endif
    HIP_CHECK(hipEventDestroy(start));
    HIP_CHECK(hipEventDestroy(stop));

    HIP_CHECK(hipMemcpy(C_h, C_d, Nbytes, hipMemcpyDeviceToHost));

    HipTest::checkVectorADD(A_h, B_h, C_h, N, true);

}
