#64: Refactor deadlock detection to use structured exceptions instead…

[EdmondDantes]

… of warnings

      - Add new Async\DeadlockError exception class extending Error
      - Replace multiple async_warning() calls with single structured exception
      - Implement proper exit_exception handling for inter-coroutine safety
      - Update resolve_deadlocks() to set ZEND_ASYNC_EXIT_EXCEPTION correctly
      - Add ZEND_ASYNC_EXCEPTION_DEADLOCK to async class enum (ID: 36)
      - Extend async_get_class_ce() to support new exception type
      - Update all deadlock tests to expect exception instead of warnings
      - Fix memory leak by removing unnecessary GC_ADDREF calls

      This change improves error handling by providing a single, catchable
      DeadlockError exception instead of multiple warnings, while maintaining
      proper coroutine cancellation behavior through exit_exception mechanism.

      Tests updated:
      - 001-deadlock-basic-test.phpt
      - 002-deadlock-with-catch.phpt
      - 003-deadlock-with-zombie.phpt
      - 010-deadlock-after-cancel-with-zombie.phpt

[Copilot]

Pull Request Overview

This PR refactors deadlock detection to use structured exception handling instead of warnings. The change replaces multiple async_warning() calls with a single Async\DeadlockError exception that extends Error, providing better error handling and catchable exceptions.

Key changes:

• Introduced Async\DeadlockError exception class extending Error
• Updated deadlock resolution to throw structured exceptions instead of warnings
• Modified all deadlock test cases to expect fatal errors with the new exception

Reviewed Changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
scheduler.c	Updated resolve_deadlocks() to create and set DeadlockError as exit exception
exceptions.stub.php	Added DeadlockError class definition extending Error
exceptions_arginfo.h	Generated registration function for new DeadlockError class
exceptions.h	Added class entry declaration and throw function for DeadlockError
exceptions.c	Implemented DeadlockError class registration and async_throw_deadlock()
async_API.c	Extended async_get_class_ce() to support ZEND_ASYNC_EXCEPTION_DEADLOCK
test files	Updated expected output to show fatal error instead of warnings
CHANGELOG.md	Documented breaking change from warnings to exceptions

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