Avoid double-free by only freeing each queue once #17
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This was mainly an issue with LCRQ, which actually implements a free function. However, this function was called from every thread when they exited, leading to a segmentation fault in many runs. Now it only lets the first thread free the queue in the benchmarks.
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This was mainly an issue with LCRQ, which actually implements a free function. However, this function was called from every thread when they exited, leading to a segmentation fault in most runs. Now it only lets a single thread free the queue in the benchmarks.