First commit with implementations of:

- `async_signal_safe_tls`
- `current_thread_id`

.clang-format

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+ExperimentalAutoDetectBinPacking: false
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+...
+

.gitattributes

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+* text=auto !eol svneol=native#text/plain
+*.gitattributes text svneol=native#text/plain
+
+cmake/headers.cmake eol=lf
+cmake/interface.cmake eol=lf
+cmake/sources.cmake eol=lf
+cmake/tests.cmake eol=lf
+
+# Scriptish formats
+*.bat        text svneol=native#text/plain
+*.bsh        text svneol=native#text/x-beanshell
+*.cgi        text svneol=native#text/plain
+*.cmd        text svneol=native#text/plain
+*.js         text svneol=native#text/javascript
+*.php        text svneol=native#text/x-php
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+*.pm         text svneol=native#text/x-perl
+*.py         text svneol=native#text/x-python
+*.sh         eol=lf svneol=LF#text/x-sh
+configure    eol=lf svneol=LF#text/x-sh
+
+# Image formats
+*.bmp        binary svneol=unset#image/bmp
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+*.svg        text svneol=native#image/svg%2Bxml
+
+# Data formats
+*.pdf        binary svneol=unset#application/pdf
+*.avi        binary svneol=unset#video/avi
+*.doc        binary svneol=unset#application/msword
+*.dsp        text svneol=crlf#text/plain
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+*.mov        binary svneol=unset#video/quicktime
+*.mp3        binary svneol=unset#audio/mpeg
+*.ppt        binary svneol=unset#application/vnd.ms-powerpoint
+*.ps         binary svneol=unset#application/postscript
+*.psd        binary svneol=unset#application/photoshop
+*.rdf        binary svneol=unset#text/rdf
+*.rss        text svneol=unset#text/xml
+*.rtf        binary svneol=unset#text/rtf
+*.sln        text svneol=native#text/plain
+*.swf        binary svneol=unset#application/x-shockwave-flash
+*.tgz        binary svneol=unset#application/gzip
+*.vcproj     text svneol=native#text/xml
+*.vcxproj    text svneol=native#text/xml
+*.vsprops    text svneol=native#text/xml
+*.wav        binary svneol=unset#audio/wav
+*.xls        binary svneol=unset#application/vnd.ms-excel
+*.zip        binary svneol=unset#application/zip
+
+# Text formats
+.htaccess    text svneol=native#text/plain
+*.bbk        text svneol=native#text/xml
+*.cmake      text svneol=native#text/plain
+*.css        text svneol=native#text/css
+*.dtd        text svneol=native#text/xml
+*.htm        text svneol=native#text/html
+*.html       text svneol=native#text/html
+*.ini        text svneol=native#text/plain
+*.log        text svneol=native#text/plain
+*.mak        text svneol=native#text/plain
+*.qbk        text svneol=native#text/plain
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+*.xslt       text svneol=native#text/xml
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+*.yml        text svneol=native#text/plain
+boost-no-inspect text svneol=native#text/plain
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+
+# Code formats
+*.c          text svneol=native#text/plain
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.github/FUNDING.yml

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+github: ned14

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+    branches:
+    - main
+  pull_request:
+  schedule:
+  - cron: '0 0 1 * *'
+
+jobs:
+  Linux:
+    name: Linux
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        compiler: [clang++, g++]
+        debug: [Debug, Release]
+        standard: [11, 23]
+        shared: [OFF, ON]
+    env:
+      NAME: Linux-${{ matrix.compiler }}-${{ matrix.debug }}-${{ matrix.standard }}-${{ matrix.shared }}
+      CXX: ${{ matrix.compiler }}
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Configure Linux
+      shell: bash
+      run: |
+        mkdir build && cd build
+        cmake .. -DCMAKE_BUILD_TYPE=${{ matrix.debug }} -DCMAKE_C_STANDARD=${{ matrix.standard }} -DBUILD_SHARED_LIBS=${{ matrix.shared }}
+
+    - name: Build Linux
+      shell: bash
+      run: cd build && cmake --build . --parallel
+
+    - name: CMake tests Linux
+      shell: bash
+      run: cd build && ctest --output-on-failure --timeout 300
+
+  MacOS:
+    name: Mac OS
+    runs-on: macos-latest
+    strategy:
+      matrix:
+        debug: [Debug, Release]
+        standard: [11, 23]
+        shared: [OFF, ON]
+    env:
+      NAME: MacOS-${{ matrix.debug }}-${{ matrix.standard }}-${{ matrix.shared }}
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Configure Mac OS
+      shell: bash
+      run: |
+        mkdir build && cd build
+        cmake .. -DCMAKE_BUILD_TYPE=${{ matrix.debug }} -DCMAKE_C_STANDARD=${{ matrix.standard }} -DBUILD_SHARED_LIBS=${{ matrix.shared }}
+
+    - name: Build Mac OS
+      shell: bash
+      run: cd build && cmake --build . --parallel
+
+    - name: CMake tests Mac OS
+      shell: bash
+      run: cd build && ctest --output-on-failure --timeout 300
+
+  Windows:
+    name: Windows VS2022
+    runs-on: windows-latest
+    strategy:
+      matrix:
+        debug: [Debug, Release]
+        standard: [11, 17]
+        shared: [OFF, ON]
+    env:
+      NAME: Windows-${{ matrix.debug }}-${{ matrix.standard }}-${{ matrix.shared }}
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Configure WinVS2022
+      shell: bash
+      run: |
+        mkdir build && cd build
+        cmake .. -DCMAKE_C_STANDARD=${{ matrix.standard }} -DBUILD_SHARED_LIBS=${{ matrix.shared }}
+
+    - name: Build WinVS2022
+      shell: bash
+      run: cd build && cmake --build . --config ${{ matrix.debug }} --parallel
+
+    - name: CMake tests WinVS2022
+      shell: bash
+      run: cd build && ctest -C ${{ matrix.debug }} --output-on-failure --timeout 300

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.15 FATAL_ERROR)
+
+option(BUILD_SHARED_LIBS "Build using shared libraries" OFF)
+set(CMAKE_C_VISIBILITY_PRESET "hidden" CACHE STRING "Only make explicitly exported symbols visible")
+set(CMAKE_CXX_VISIBILITY_PRESET "hidden" CACHE STRING "Only make explicitly exported symbols visible")
+set(CMAKE_C_STANDARD "11" CACHE STRING "C standard to use")
+
+project(wg14_signals LANGUAGES C CXX)
+include(GNUInstallDirs)
+enable_testing()
+
+set(LIBRARY_SOURCES
+  "src/wg14_signals/async_signal_safe_tls.c"
+  "src/wg14_signals/current_thread_id.c"
+
+  # Not mandatory and can be substituted
+  "src/wg14_signals/thread_atexit.cpp"
+)
+
+add_library(${PROJECT_NAME} ${LIBRARY_SOURCES})
+target_compile_features(${PROJECT_NAME} PRIVATE c_std_11 cxx_std_11)
+target_compile_definitions(${PROJECT_NAME} PRIVATE WG14_SIGNALS_SOURCE)
+target_include_directories(${PROJECT_NAME} PUBLIC
+  "$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>"
+  "$<INSTALL_INTERFACE:include>"
+)
+set_target_properties(${PROJECT_NAME} PROPERTIES
+  ARCHIVE_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/lib"
+  LIBRARY_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/lib"
+  RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/bin"
+)
+if(WIN32)
+  target_compile_options(${PROJECT_NAME} PRIVATE /W4 /experimental:c11atomics)
+else()
+  target_compile_options(${PROJECT_NAME} PRIVATE -Wall -Wextra -Wpedantic -Werror)
+endif()
+
+install(TARGETS ${PROJECT_NAME}
+        EXPORT ${PROJECT_NAME}Exports
+        INCLUDES DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}"
+        ARCHIVE DESTINATION "${CMAKE_INSTALL_LIBDIR}"
+        LIBRARY DESTINATION "${CMAKE_INSTALL_LIBDIR}"
+        RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}"
+)
+
+configure_file(
+  "${CMAKE_CURRENT_LIST_DIR}/cmake/ProjectConfig.cmake.in"
+  "${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}Config.cmake"
+  @ONLY
+)
+install(FILES
+  "${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}Config.cmake"
+  DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}"
+)
+install(EXPORT ${PROJECT_NAME}Exports
+  NAMESPACE ${PROJECT_NAME}::
+  DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}"
+)
+
+if(PROJECT_IS_TOP_LEVEL AND (NOT DEFINED BUILD_TESTING OR BUILD_TESTING))
+  function(add_code_example target)
+    cmake_parse_arguments(ADD_EXAMPLE "" "" "SOURCES;FEATURES;PROPERTIES" ${ARGN})
+    add_executable(${target} ${ADD_EXAMPLE_SOURCES})
+    target_compile_features(${target} PRIVATE ${ADD_EXAMPLE_FEATURES})
+    target_link_libraries(${target} PRIVATE ${PROJECT_NAME})
+    set_target_properties(${target} PROPERTIES
+      RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/bin"
+      ${ADD_EXAMPLE_PROPERTIES}
+    )
+  endfunction()
+  function(add_code_test target)
+    add_code_example(${target} ${ARGN})
+    add_test(NAME ${target} COMMAND $<TARGET_FILE:${target}>)
+  endfunction()
+
+  add_subdirectory("test")
+endif()
+

Readme.md

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+# Reference implementation for proposed extensions to standard C signals handling
+
+(C) 2024 Niall Douglas [http://www.nedproductions.biz/](http://www.nedproductions.biz/)
+
+CI: [![CI](https://github.com/ned14/wg14_signals/actions/workflows/ci.yml/badge.svg)](https://github.com/ned14/wg14_signals/actions/workflows/ci.yml)
+
+Can be configured to be a standard library implementation for your
+standard C library runtime. Licensed permissively.
+
+## Example of use
+
+```c
+todo
+```
+
+## Supported targets
+
+This library should work well on any POSIX implementation, as well as
+Microsoft Windows. You will need a minimum of C 11 in your toolchain.
+Every architecture supporting C 11 atomics should work.
+
+Current CI test targets:
+
+- Ubuntu Linux, x64.
+- Mac OS, AArch64.
+- Microsoft Windows, x64.
+

cmake/ProjectConfig.cmake.in

@@ -0,0 +1,13 @@
+@PACKAGE_INIT@
+
+@PROJECT_PACKAGE_DEPENDENCIES@
+
+include("${CMAKE_CURRENT_LIST_DIR}/@PROJECT_NAME@Exports.cmake")
+if (EXISTS "${CMAKE_CURRENT_LIST_DIR}/@PROJECT_NAME@SlExports.cmake")
+  include("${CMAKE_CURRENT_LIST_DIR}/@PROJECT_NAME@SlExports.cmake")
+endif()
+if (EXISTS "${CMAKE_CURRENT_LIST_DIR}/@PROJECT_NAME@DlExports.cmake")
+  include("${CMAKE_CURRENT_LIST_DIR}/@PROJECT_NAME@DlExports.cmake")
+endif()
+
+check_required_components(@PROJECT_NAME@)