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ea408ab6c0
currently this is not necessary because context (WASINNContext) is local to instance. (wasm_module_instance_t) i plan to make a context shared among instances in a cluster when fixing https://github.com/bytecodealliance/wasm-micro-runtime/issues/4313. this is a preparation for that direction. an obvious alternative is to tweak the module instance context APIs to allow declaring some kind of contexts instance-local. but i feel, in this particular case, it's more natural to make "wasi-nn handles" shared among threads within a "process". note that, spec-wise, how wasi-nn behaves wrt threads is not defined at all because wasi officially doesn't have threads yet. i suppose, at this point, that how wasi-nn interacts with wasi-threads is something we need to define by ourselves, especially when we are using an outdated wasi-nn version. with this change, if a thread attempts to access a context while another thread is using it, we simply make the operation fail with the "busy" error. this is intended for the mimimum serialization to avoid problems like crashes/leaks/etc. this is not intended to allow parallelism or such. no functional changes are intended at this point yet. cf. https://github.com/bytecodealliance/wasm-micro-runtime/issues/4313 https://github.com/bytecodealliance/wasm-micro-runtime/issues/2430 |
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