// Copyright The OpenTelemetry Authors // SPDX-License-Identifier: Apache-2.0 #include #include #include #include #include #include "opentelemetry/exporters/ostream/span_exporter_factory.h" #include "opentelemetry/nostd/shared_ptr.h" #include "opentelemetry/nostd/string_view.h" #include "opentelemetry/sdk/resource/resource.h" #include "opentelemetry/sdk/trace/exporter.h" #include "opentelemetry/sdk/trace/processor.h" #include "opentelemetry/sdk/trace/provider.h" #include "opentelemetry/sdk/trace/simple_processor_factory.h" #include "opentelemetry/sdk/trace/tracer_provider.h" #include "opentelemetry/sdk/trace/tracer_provider_factory.h" #include "opentelemetry/trace/provider.h" #include "opentelemetry/trace/scope.h" #include "opentelemetry/trace/span.h" #include "opentelemetry/trace/tracer.h" #include "opentelemetry/trace/tracer_provider.h" namespace trace_api = opentelemetry::trace; namespace trace_sdk = opentelemetry::sdk::trace; namespace { void InitTracer() { auto exporter = opentelemetry::exporter::trace::OStreamSpanExporterFactory::Create(); auto processor = trace_sdk::SimpleSpanProcessorFactory::Create(std::move(exporter)); std::shared_ptr provider = trace_sdk::TracerProviderFactory::Create(std::move(processor), opentelemetry::sdk::resource::Resource::Create({})); // Set the global trace provider trace_sdk::Provider::SetTracerProvider(provider); } void CleanupTracer() { std::shared_ptr none; trace_sdk::Provider::SetTracerProvider(none); } opentelemetry::nostd::shared_ptr get_tracer() { auto provider = trace_api::Provider::GetTracerProvider(); return provider->GetTracer("foo_library"); } } // namespace void run_threads() { auto thread_span = get_tracer()->StartSpan(__func__); std::vector threads; threads.reserve(5); for (int thread_num = 0; thread_num < 5; ++thread_num) { // This shows how one can effectively use Scope objects to correctly // parent spans across threads. threads.push_back(std::thread([=] { trace_api::Scope scope(thread_span); auto thread_span_2 = get_tracer()->StartSpan(std::string("thread ") + std::to_string(thread_num)); })); } std::for_each(threads.begin(), threads.end(), [](std::thread &th) { th.join(); }); } int main(int /* argc */, char ** /* argv */) { InitTracer(); { auto root_span = get_tracer()->StartSpan(__func__); trace_api::Scope scope(root_span); run_threads(); } CleanupTracer(); return 0; }