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#[cfg_attr(target_arch = "wasm32", allow(unused_variables))] |
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pub fn fence(order: Ordering) { |
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// On wasm32 it looks like fences aren't implemented in LLVM yet in that |
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// they will cause LLVM to abort. The wasm instruction set doesn't have |
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// fences right now. There's discussion online about the best way for tools |
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// to conventionally implement fences at |
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// https://github.com/WebAssembly/tool-conventions/issues/59. We should |
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// follow that discussion and implement a solution when one comes about! |
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#[cfg(not(target_arch = "wasm32"))] |
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unsafe { |
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match order { |
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Acquire => intrinsics::atomic_fence_acq(), |
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Release => intrinsics::atomic_fence_rel(), |
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AcqRel => intrinsics::atomic_fence_acqrel(), |
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SeqCst => intrinsics::atomic_fence(), |
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Relaxed => panic!("there is no such thing as a relaxed fence"), |
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} |
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} |
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} |
The comment says that the issue should be watched, but it has been closed for 2 months now with an implementation for wasm32 at llvm/llvm-project@d85fd5a
The branch rust uses doesn't include that commit yet (llvm/llvm-project@d85fd5a), but it's available.
Maybe llvm can be updated and the config attributes removed?
