Validate thread count in thpool_init() and return NULL for non-positi… #136
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This pull request adds a sanity check to thpool_init() to ensure that the number of threads passed during initialization is greater than zero. If a non-positive value (≤ 0) is provided, the function now logs an error and returns NULL.
Previously, passing num_threads <= 0 would silently proceed, potentially resulting in a thread pool with zero threads—causing jobs to never be executed and thpool_wait() to hang indefinitely.