threadpool: improve cooperative downsizing #4293
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Turn the exit flag back into a proper count. Fixes a regression introduced in commit 27229aa.
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Ah, nice! I remember I did wonder about the flag (counts are usually much safer), but I couldn't think of a reason it wouldn't work. Threading is hard :( |
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It seems the previous implementation was ~14% faster on the NetVips benchmarks. For example, the ~11ms performance gain shown in this diff appears only with libvips v8.16.0. Though, I ran these benchmarks on Windows, I haven't (yet) checked if the results are the same on Linux. |
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Ah, I forgot to reduce the concurrency in that benchmark, it's much faster with |
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Turn the exit flag back into a proper count.
Fixes a regression introduced in commit 27229aa.
Context: #4276.