libcopp

Cross-platform coroutine library in C++.

CI Job Matrix

Target System	Toolchain	Note
Linux	GCC	Static linking
Linux	GCC	Dynamic linking
Linux	GCC-latest
Linux	GCC-latest	No Exception
Linux	GCC-latest	Thread Unsafe
Linux	Clang-latest	With libc++
MinGW64	GCC	Dynamic linking
Windows	Visual Studio 2022	Static linking
Windows	Visual Studio 2022	Dynamic linking
macOS	AppleClang	With libc++

License

License under the MIT LICENSE.

Document

Documents can be found at https://libcopp.atframe.work, API references can be found at https://libcopp.atframe.work/doxygen/html/. (Generated by MkDocs with docs/mkdocs.yml and Doxygen with docs/libcopp.doxyfile.in.)

UPGRADE FROM 1.3.X-1.4.X to 2.X

• Add using value_type = int; into T when using cotask::task<T>.
• Rename stack_allocator_t to stack_allocator_type in T when using cotask::task<T>.
• Rename coroutine_t to coroutine_type in T when using cotask::task<T>.
• Rename libcopp::util::* to copp::util::.
• We are not allowed to use libcopp::util::intrusive_ptr<cotask::impl::task_impl> now, please use cotask::task<T>::ptr_type instead.

UPGRADE FROM 1.2.X to 1.3.X-1.4.X

• Rename cotask::task::await into cotask::task::await_task.
• Replace cotask::task<TCO_MACRO, TTASK_MACRO> with cotask::task<TCO_MACRO>, we don't allow to custom id allocator now.
• Replace cotask::core::standard_int_id_allocator<uint64_t> with copp::util::uint64_id_allocator, we don't allow to custom id allocator now.
• Require gcc 4.8+, MSVC 15+(Visual Studio 2017>).
• Require cmake 3.12.0 or upper.

INSTALL

libcopp use cmake to generate makefile and switch build tools.

Prerequisites

• [required] GCC or Clang or MSVC or clang-cl support ISO C++ 11 and upper
• [required] cmake 3.16.0 and upper
• [optional] gtest 1.6.0 and upper (Better unit test supported)
• [optional] Boost.Test (Boost.Test supported)

Unix

• [required] ar, as, ld (binutils) or llvm
• [optional] if using gtest, pthread is required.

Windows

• [required] masm (in MSVC)
• [optional] if using gtest, pthread is required.

Install with vcpkg

1. Clone and setup vcpkg (See more detail on https://github.com/Microsoft/vcpkg)

   shellCopy
   git clone https://github.com/Microsoft/vcpkg.git
   cd vcpkg
   PS> bootstrap-vcpkg.bootstrap
   Linux:~/$ ./bootstrap-vcpkg.sh

2. Install libcopp

   shellCopy
   PS> .\vcpkg install libcopp [--triplet x64-windows-static/x64-windows/x64-windows-static-md and etc...]
   Linux:~/$ ./vcpkg install libcopp

3. See using with cmake for cmake below.

Custom Build

1. Clone and make a build directory

   shellCopy
   git clone --single-branch --depth=1 -b master https://github.com/owent/libcopp.git
   mkdir libcopp/build && cd libcopp/build

2. Run cmake command

   shellCopy
   # cmake <libcopp dir> [options...]
   cmake .. -DPROJECT_ENABLE_UNITTEST=YES -DPROJECT_ENABLE_SAMPLE=YES

3. Make libcopp

   shellCopy
   cmake --build . --config RelWithDebInfo # or make [options] when using Makefile

4. Run test/sample/benchmark [optional]

   shellCopy
   # Run test => Required: PROJECT_ENABLE_UNITTEST=YES
   ctest -VV . -C RelWithDebInfo -L libcopp.unit_test
   # Run sample => Required: PROJECT_ENABLE_SAMPLE=YES
   ctest -VV . -C RelWithDebInfo -L libcopp.sample
   # Run benchmark => Required: PROJECT_ENABLE_SAMPLE=YES
   ctest -VV . -C RelWithDebInfo -L libcopp.benchmark

5. Install [optional]

   shellCopy
   cmake --build . --config RelWithDebInfo --target install # or make install when using Makefile

6. Then just include and link libcopp.*/libcotask.*, or see using with cmake for cmake below.

CMake Options

Options can be cmake options. such as set compile toolchains, source directory or options of libcopp that control build actions. libcopp options are listed below:

Option	Description
BUILD_SHARED_LIBS=YES|NO	[default=NO] Build dynamic library.
LIBCOPP_ENABLE_SEGMENTED_STACKS=YES|NO	[default=NO] Enable split stack supported context.(it's only availabe in linux and gcc 4.7.0 or upper)
LIBCOPP_ENABLE_VALGRIND=YES|NO	[default=YES] Enable valgrind supported context.
PROJECT_ENABLE_UNITTEST=YES|NO	[default=NO] Build unit test.
PROJECT_ENABLE_SAMPLE=YES|NO	[default=NO] Build samples.
LIBCOPP_ENABLE_MULTI_THREAD=YES|NO	[default=YES] Enable multi-thread support.
LIBCOTASK_ENABLE=YES|NO	[default=YES] Enable build libcotask.
LIBCOPP_FCONTEXT_USE_TSX=YES|NO	[default=YES] Enable Intel Transactional Synchronisation Extensions (TSX).
LIBCOPP_MACRO_TLS_STACK_PROTECTOR=YES|NO	[default=NO] Users need set LIBCOPP_MACRO_TLS_STACK_PROTECTOR=ON when compiling with -fstack-protector. Because it changes the default context switching logic.
GTEST_ROOT=[path]	set gtest library install prefix path
BOOST_ROOT=[path]	set Boost.Test library install prefix path

USAGE

Using with cmake

1. Using set(Libcopp_ROOT <where to find libcopp/INSTALL_PREFIX>)

2. Just using find_package(Libcopp) to use libcopp module.

3. Example:(we assume the target name is stored in ${CUSTOM_TARGET_NAME})

   cmakeCopy
   find_package(Libcopp CONFIG REQUIRED)
   target_link_libraries(${CUSTOM_TARGET_NAME} libcopp::cotask)
   # Or just using copp by target_link_libraries(${CUSTOM_TARGET_NAME} libcopp::copp)

If using MSVC and vcpkg, CRT must match the triplet of vcpkg, these codes below may be helpful:

cmakeCopy
if (MSVC AND VCPKG_TOOLCHAIN)
    if(DEFINED ENV{VCPKG_DEFAULT_TRIPLET} AND NOT DEFINED VCPKG_TARGET_TRIPLET)
        set(VCPKG_TARGET_TRIPLET "$ENV{VCPKG_DEFAULT_TRIPLET}" CACHE STRING "")
    endif()
    if (VCPKG_TARGET_TRIPLET MATCHES "^.*windows-static$")
        set(CMAKE_MSVC_RUNTIME_LIBRARY "MultiThreaded$<$<CONFIG:Debug>:Debug>" CACHE STRING "")
    else ()
        set(CMAKE_MSVC_RUNTIME_LIBRARY "MultiThreaded$<$<CONFIG:Debug>:Debug>DLL" CACHE STRING "")
    endif ()
endif ()

See more detail on https://github.com/Microsoft/vcpkg/tree/master/ports/libcopp.

Directly use headers and libraries

Just include headers and linking library file of your platform to use libcopp.

shellCopy
LIBCOPP_PREFIX=<WHERE TO INSTALL libcopp>

# Example command for build sample with gcc 4.9 or upper on Linux
for source in sample_readme_*.cpp; do
    g++ -std=c++14 -O2 -g -ggdb -Wall -Werror -fPIC -rdynamic -fdiagnostics-color=auto -Wno-unused-local-typedefs \
        -I$LIBCOPP_PREFIX/include -L$LIBCOPP_PREFIX/lib64 -lcopp -lcotask $source -o $source.exe;
done

# Example command for build sample with clang 3.9 or upper and libc++ on Linux
for source in sample_readme_*.cpp; do
    clang++ -std=c++17 -stdlib=libc++ -O2 -g -ggdb -Wall -Werror -fPIC -rdynamic \
        -I$LIBCOPP_PREFIX/include -L$LIBCOPP_PREFIX/lib64 -lcopp -lcotask -lc++ -lc++abi \
        $source -o $source.exe;
done

# AppleClang on macOS just like those scripts upper.
# If you are using MinGW on Windows, it's better to add -static-libstdc++ -static-libgcc to 
#     use static linking and other scripts are just like those on Linux.

shellCopy
# Example command for build sample with MSVC 1914 or upper on Windows & powershell(Debug Mode /MDd)
foreach ($source in Get-ChildItem -File -Name .\sample_readme_*.cpp) {
    cl /nologo /MP /W4 /wd"4100" /wd"4125" /EHsc /std:c++17 /Zc:__cplusplus /O2 /MDd /I$LIBCOPP_PREFIX/include $LIBCOPP_PREFIX/lib64/copp.lib $LIBCOPP_PREFIX/lib64/cotask.lib $source
}

Get Start & Example

There serveral samples to use copp::coroutine_context, copp::coroutine_context_fiber and cotask::task:

1. Using coroutine context
2. Using coroutine task
3. Using coroutine task manager
4. Using stack pool
5. Using task::then or task::await_task
6. Using copp::callable_promise of c++20 coroutine
7. Using copp::generator_future for c++20 coroutine
8. Custom error (timeout for example) when using c++20 coroutine
9. Let c++20 coroutine work with cotask::task
10. Using Windows fiber and SetUnhandledExceptionFilter on Windows with cotask::task
11. Using c++20 coroutine with channel receiver and sender
12. Using stackful coroutine task with channel receiver and sender
13. Using stackful coroutine with channel receiver and sender
14. Using c++20 coroutine with channel receiver and sender

All sample codes can be found on EXAMPLES and sample.

NOTICE

Split stack support: if in Linux and user gcc 4.7.0 or upper, add -DLIBCOPP_ENABLE_SEGMENTED_STACKS=YES to use split stack supported context.

It's recommanded to use stack pool instead of gcc splited stack.

BENCHMARK

Please see CI output for latest benchmark report. Click to visit Github Actions.

FAQ

Q: How to enable c++20 coroutine

ANS: Add /std:c++latest /await for MSVC 1932 and below or -std=c++20 -fcoroutines-ts -stdlib=libc++ for clang 13 and below or -std=c++20 -fcoroutines for gcc 10.

If you can just use -std=c++20 -stdlib=libc++ clang 14 or above, -astd=c++20 for gcc 11 or above, and /std:c++latest for MSVC 1932 or above.

Q: Will libcopp handle exception?

ANS: When using c++11 or above, libcopp will catch all unhandled exception and rethrow it after coroutine resumed.

Q: Why SetUnhandledExceptionFilter can not catch the unhandled exception in a coroutine?

ANS: SetUnhandledExceptionFilter only works with Windows Fiber, please see sample/sample_readme_11.cpp for details.

FEEDBACK

If you has any question, please create a issue and provide the information of your environments. For example:

• OS: Windows 10 Pro 19041 (This can be see after running msinfo32) / Manjaro(Arch) Linux Linux 5.4.39-1-MANJARO
• Compiler: Visual Studio 2022 C++ 17.14.6 with VS 2022 C++ v14.38 or MSVC 1925/ gcc 9.3.0
• CMake Commands: cmake .. -G "Visual Studio 17 2022" -A x64 -DLIBCOPP_FCONTEXT_USE_TSX=ON -DPROJECT_ENABLE_UNITTEST=ON -DPROJECT_ENABLE_SAMPLE=ON-DCMAKE_BUILD_TYPE=RelWithDebInfo -DCMAKE_INSTALL_PREFIX=%cd%/install-prefix / cmake .. -G Ninja -DLIBCOPP_FCONTEXT_USE_TSX=ON -DPROJECT_ENABLE_UNITTEST=ON -DPROJECT_ENABLE_SAMPLE=ON -DCMAKE_BUILD_TYPE=RelWithDebInfo -DCMAKE_INSTALL_PREFIX=/opt/libcopp
• Compile Commands: cmake --build . -j
• Related Environment Variables: Please provide all the environment variables which will change the cmake toolchain, CC, CXX, AR and etc.

CONTRIBUTORS

• owent

THANKS TO

• mutouyun