Method notify_fail

engine/src/execution_kernels/kernel.cpp:117–121

}

void kernel::notify_fail(size_t task_id){
    std::lock_guard<std::mutex> lock(kernel_mutex);
    this->tasks.erase(task_id);
    kernel_cv.notify_one();
}

// This is only the default estimate of the bytes to be output by a kernel based on the input.
// Each kernel should implement its own version of this, if its possible to obtain a better estimate