Implement thread pool with work-stealing scheduler#285
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This replaces the previous approach of creating a new pthread for every spawn() call with a fixed-size thread pool that reuses worker threads. Workers can steal tasks from each other to balance load automatically. Key changes: - Add work-stealing thread pool with Chase-Lev deques - Workers default to CPU count threads (configurable) - Per-worker local deques with lock-free push/pop - Random work stealing when local deque is empty - Global submission queue for external spawn() calls - Shutdown drains all pending work gracefully Both interpreter and compiler runtime use the same design, maintaining parity between the two backends. This prevents runaway thread creation when spawning many async tasks while still maintaining good parallelism through work stealing.
When tasks block on channels or I/O, having only CPU count workers can cause deadlock-like situations where all workers are waiting. Using 2x CPU count provides headroom for blocking tasks.
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This replaces the previous approach of creating a new pthread for every
spawn() call with a fixed-size thread pool that reuses worker threads.
Workers can steal tasks from each other to balance load automatically.
Key changes:
Both interpreter and compiler runtime use the same design, maintaining
parity between the two backends.
This prevents runaway thread creation when spawning many async tasks
while still maintaining good parallelism through work stealing.