rustix 0.33.7

Safe Rust bindings to POSIX/Unix/Linux/Winsock2-like syscalls
Documentation 
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#[test]
fn test_membarrier() {
    use rustix::process::{membarrier, membarrier_query, MembarrierCommand, MembarrierQuery};

    let query: MembarrierQuery = membarrier_query();

    // Supported registration commands should succeed.
    for cmd in [
        MembarrierCommand::RegisterGlobalExpedited,
        MembarrierCommand::RegisterPrivateExpedited,
        MembarrierCommand::RegisterPrivateExpeditedSyncCore,
        MembarrierCommand::RegisterPrivateExpeditedRseq,
    ]
    .iter()
    .copied()
    {
        if query.contains_command(cmd) {
            membarrier(cmd).unwrap();
        }
    }

    // All supported commands should now succeed, and all unsupported
    // commands should fail.
    for cmd in [
        MembarrierCommand::Global,
        MembarrierCommand::GlobalExpedited,
        MembarrierCommand::PrivateExpedited,
        MembarrierCommand::PrivateExpeditedSyncCore,
        MembarrierCommand::PrivateExpeditedRseq,
    ]
    .iter()
    .copied()
    {
        if query.contains_command(cmd) {
            membarrier(cmd).unwrap();
        } else {
            membarrier(cmd).unwrap_err();
        }
    }
}