Cancel queue #286
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Cancel queue #286
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jethrogb
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Oct 8, 2020
jethrogb
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Oct 9, 2020
| @@ -453,6 +453,10 @@ pub const EV_RETURNQ_NOT_EMPTY: u64 = 0b0000_0000_0000_0010; | |||
| /// An event that enclaves can use for synchronization. | |||
| #[cfg_attr(feature = "rustc-dep-of-std", unstable(feature = "sgx_platform", issue = "56975"))] | |||
| pub const EV_UNPARK: u64 = 0b0000_0000_0000_0100; | |||
| /// An event that will be triggered by userspace when the cancel queue is not | |||
| /// or no longer full. | |||
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I didn't check the exact language when looking at the other queue. Are we correctly handling the “not full” case? i.e. this phrasing suggests that if the enclave calls wait on a queue event and there is no event pending but the queue is not empty/full, an event should be generated immediately.
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I don't think we do that in the implementation. It's based on the assumption that the enclave would only issue a wait usercall with NOT_EMPTY/NOT_FULL only after trying to send/recv on a queue. But I don't think it would be too difficult to change this. We'd need some way of getting the queue's empty/full state in fn wait.
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|
Close this since this is done by #515 |
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This is on top of PR #246 and adds a third queue for cancelling blocked usercalls.