A self-contained C implementation of a thread pool with static, dynamic, and guided scheduling strategies. It manages a fixed number of worker threads, task queues, and synchronization via pthreads. This file has no internal dependencies on the rest of CppADCodeGen, making it directly reusable in any C or C++ project requiring parallel task execution. It demonstrates careful handling of thread safety, work stealing, and graceful shutdown.

Implements a bipartite graph data structure used for DAE index reduction via Pantelides' algorithm. It supports adding equation and variable nodes, creating edges based on variable occurrence, performing matching to find the structural index, and generating differentiated equations. Although it relies on internal types (DaeEquationInfo, DaeVarInfo), the core bipartite graph logic (nodes, edges, augmenting path) is well-isolated and could be extracted for other matching or assignment problems. The implementation uses efficient adjacency lists and iterative depth-first search.

A RAII-based job timer that records elapsed wall-clock or CPU time and reports to a callback listener. It is thread-safe and designed for profiling compilation steps (code generation, compilation, model loading). The timer is a standalone utility with minimal dependencies (chrono, listener interface) and can be reused in any C++ project needing fine-grained performance measurement. It demonstrates clean separation of concerns between measurement and reporting.