wasi-nn: add minimum serialization on WASINNContext #4387
+120
−33
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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 bytecodealliance#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how wasi-nn interacts with wasi-threads is something we need to define by ourselves, especially when we are using an outdated wasi-nn version.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. bytecodealliance#4313 bytecodealliance#2430
yamt
requested review from
loganek,
lum1n0us,
no1wudi,
TianlongLiang,
wenyongh and
xujuntwt95329
as code owners
TianlongLiang
approved these changes
Jun 18, 2025
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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 #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how wasi-nn interacts with wasi-threads is something we need to define by ourselves, especially when we are using an outdated wasi-nn version.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.
#4313
#2430