126 lines
4.0 KiB
C++
126 lines
4.0 KiB
C++
/*
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tests/test_iostream.cpp -- Usage of scoped_output_redirect
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Copyright (c) 2017 Henry F. Schreiner
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All rights reserved. Use of this source code is governed by a
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BSD-style license that can be found in the LICENSE file.
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*/
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#if defined(_MSC_VER) && _MSC_VER < 1910 // VS 2015's MSVC
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# pragma warning(disable: 4702) // unreachable code in system header (xatomic.h(382))
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#endif
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#include <pybind11/iostream.h>
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#include "pybind11_tests.h"
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#include <atomic>
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#include <iostream>
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#include <mutex>
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#include <string>
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#include <thread>
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void noisy_function(const std::string &msg, bool flush) {
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std::cout << msg;
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if (flush)
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std::cout << std::flush;
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}
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void noisy_funct_dual(const std::string &msg, const std::string &emsg) {
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std::cout << msg;
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std::cerr << emsg;
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}
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// object to manage C++ thread
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// simply repeatedly write to std::cerr until stopped
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// redirect is called at some point to test the safety of scoped_estream_redirect
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struct TestThread {
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TestThread() : stop_{false} {
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auto thread_f = [this] {
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static std::mutex cout_mutex;
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while (!stop_) {
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{
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// #HelpAppreciated: Work on iostream.h thread safety.
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// Without this lock, the clang ThreadSanitizer (tsan) reliably reports a
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// data race, and this test is predictably flakey on Windows.
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// For more background see the discussion under
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// https://github.com/pybind/pybind11/pull/2982 and
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// https://github.com/pybind/pybind11/pull/2995.
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const std::lock_guard<std::mutex> lock(cout_mutex);
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std::cout << "x" << std::flush;
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}
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std::this_thread::sleep_for(std::chrono::microseconds(50));
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} };
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t_ = new std::thread(std::move(thread_f));
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}
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~TestThread() {
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delete t_;
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}
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void stop() { stop_ = true; }
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void join() const {
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py::gil_scoped_release gil_lock;
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t_->join();
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}
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void sleep() {
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py::gil_scoped_release gil_lock;
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std::this_thread::sleep_for(std::chrono::milliseconds(50));
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}
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std::thread *t_{nullptr};
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std::atomic<bool> stop_;
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};
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TEST_SUBMODULE(iostream, m) {
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add_ostream_redirect(m);
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// test_evals
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m.def("captured_output_default", [](const std::string &msg) {
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py::scoped_ostream_redirect redir;
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std::cout << msg << std::flush;
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});
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m.def("captured_output", [](const std::string &msg) {
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py::scoped_ostream_redirect redir(std::cout, py::module_::import("sys").attr("stdout"));
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std::cout << msg << std::flush;
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});
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m.def("guard_output", &noisy_function,
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py::call_guard<py::scoped_ostream_redirect>(),
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py::arg("msg"), py::arg("flush")=true);
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m.def("captured_err", [](const std::string &msg) {
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py::scoped_ostream_redirect redir(std::cerr, py::module_::import("sys").attr("stderr"));
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std::cerr << msg << std::flush;
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});
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m.def("noisy_function", &noisy_function, py::arg("msg"), py::arg("flush") = true);
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m.def("dual_guard", &noisy_funct_dual,
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py::call_guard<py::scoped_ostream_redirect, py::scoped_estream_redirect>(),
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py::arg("msg"), py::arg("emsg"));
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m.def("raw_output", [](const std::string &msg) { std::cout << msg << std::flush; });
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m.def("raw_err", [](const std::string &msg) { std::cerr << msg << std::flush; });
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m.def("captured_dual", [](const std::string &msg, const std::string &emsg) {
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py::scoped_ostream_redirect redirout(std::cout, py::module_::import("sys").attr("stdout"));
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py::scoped_ostream_redirect redirerr(std::cerr, py::module_::import("sys").attr("stderr"));
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std::cout << msg << std::flush;
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std::cerr << emsg << std::flush;
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});
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py::class_<TestThread>(m, "TestThread")
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.def(py::init<>())
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.def("stop", &TestThread::stop)
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.def("join", &TestThread::join)
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.def("sleep", &TestThread::sleep);
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}
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