[hist] Disable thread-safe TH3D on 32-bit platforms.#20874
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hageboeck merged 1 commit intoroot-project:masterfrom Jan 15, 2026
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[hist] Disable thread-safe TH3D on 32-bit platforms.#20874hageboeck merged 1 commit intoroot-project:masterfrom
hageboeck merged 1 commit intoroot-project:masterfrom
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On 32 bits, the alignment of double is less strict than for atomic_ref<double>, so TH3D::FillThreadSafe cannot be used. Fix root-project#20834.
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Shouldn't we rather fix the alignment of the variables in question? |
Test Results 23 files 23 suites 4d 1h 17m 32s ⏱️ Results for commit a78974f. |
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It's a valid alternative, but I guess the work to be invested outweighs the benefits. This would only be used on 32-bit platforms with multithreaded filling from RDF with C++20. And more importantly, with RHist integrated in RDF, I would actually remove this function. |
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Jan 14, 2026
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Thanks. Please remember the backport.
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On 32 bits, the alignment of double is less strict than for atomic_ref, so TH3D::FillThreadSafe cannot be used.
Tested the
#if definedin a 32 bit container, and it indeed disables the Fill function. I couldn't reproduce the alignment failure, though, since it ran on a 64 bit machine that kept the alignment at 64.Fixes #20834.