wasmtime / issue #5643 `fd_fdstat_set_flags` requires mut... · git-wasmtime

Stream: git-wasmtime

Topic: wasmtime / issue #5643 `fd_fdstat_set_flags` requires mut...

Wasmtime GitHub notifications bot (Jan 27 2023 at 01:20):

In https://github.com/bytecodealliance/wasmtime/pull/5326, we discussed extensively how to resolve the build errors related to fd_fdstat_set_flags, a wasi-common function. When attempting to apply locking to wasi-common to enable multi-threaded access, this function was the sole remaining issue preventing the implementation of WasiSnapshotPreview1 from using &self (what we wanted to switch to) instead of the current &mut self. If fd_fdstat_set_flags could take &self instead, this would result in a variety of benefits:

there would be no need to wrap WasiCtx (and friends) in an inner structure containing an Arc; the Arc could be applied to the top-level Host structure instead

all of WasiSnapshotPreview1 could be implemented in terms of &self instead of &mut self

several supporting derive(Clone) and mutating functions could go away

At some point I had heard of discussions to modify this API; if and when that happens, the above improvements could be made.

Wasmtime GitHub notifications bot (Jan 31 2023 at 05:15):

alexcrichton labeled issue #5643:

In https://github.com/bytecodealliance/wasmtime/pull/5326, we discussed extensively how to resolve the build errors related to fd_fdstat_set_flags, a wasi-common function. When attempting to apply locking to wasi-common to enable multi-threaded access, this function was the sole remaining issue preventing the implementation of WasiSnapshotPreview1 from using &self (what we wanted to switch to) instead of the current &mut self. If fd_fdstat_set_flags could take &self instead, this would result in a variety of benefits:

there would be no need to wrap WasiCtx (and friends) in an inner structure containing an Arc; the Arc could be applied to the top-level Host structure instead

all of WasiSnapshotPreview1 could be implemented in terms of &self instead of &mut self

several supporting derive(Clone) and mutating functions could go away

At some point I had heard of discussions to modify this API; if and when that happens, the above improvements could be made.

Last updated: Dec 06 2025 at 06:05 UTC