feat: Integrate timers with epoll loop, implement posix signals

[sgerbino]

Windows build fixes:

• Add BOOST_COROSIO_DECL to tcp_server nested classes (worker_base, workers, launcher) for proper DLL export
• Delete copy operations on workers class to prevent MSVC from instantiating copy constructor for vector<unique_ptr<>>
• Suppress C4251 warnings for private members with #pragma
• Convert push_aw/pop_aw::await_suspend to templates matching IoAwaitable concept

POSIX signal_set implementation:

• Add posix_signals service using C signal() handlers
• Implement global signal state for cross-service coordination
• Support signal registration, async wait, cancellation, and queuing

Timer service fixes:

• Integrate timer_service with posix_scheduler epoll loop
• Add calculate_timeout() to wake epoll for timer deadlines
• Fix work tracking: use post() instead of dispatch() to prevent premature io_context::run() exit

Lambda coroutine lifetime fixes:

• Fix stack-use-after-scope bugs in mocket source and tests
• Fix 19 lambda coroutines in timer.cpp tests
• Fix 15 lambda coroutines in signal_set.cpp tests
• Change [&] captures to explicit parameter passing

Build system:

• Add mocket, signal_set, timer tests to Jamfile

[cppalliance-bot]

An automated preview of the documentation is available at https://31.corosio.prtest3.cppalliance.org/index.html

If more commits are pushed to the pull request, the docs will rebuild at the same URL.

2026-01-19 16:07:55 UTC