While we have support for generic timeouts, we don't have a way to tie a timeout to a specific SQE. The generic timeouts simply trigger wakeups on the CQ ring. This adds support for IORING_OP_LINK_TIMEOUT. This command is only valid as a link to a previous command. The timeout specific can be either relative or absolute, following the same rules as IORING_OP_TIMEOUT. If the timeout triggers before the dependent command completes, it will attempt to cancel that command. Likewise, if the dependent command completes before the timeout triggers, it will cancel the timeout.
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| @@ -72,6 +72,7 @@ struct io_uring_sqe { · 71 unmodified lines | |||
| 72 | #define IORING_OP_TIMEOUT_REMOVE 12 | 72 | #define IORING_OP_TIMEOUT_REMOVE 12 |
| 73 | #define IORING_OP_ACCEPT 13 | 73 | #define IORING_OP_ACCEPT 13 |
| 74 | #define IORING_OP_ASYNC_CANCEL 14 | 74 | #define IORING_OP_ASYNC_CANCEL 14 |
| 75 | #define IORING_OP_LINK_TIMEOUT 15 | ||
| 75 | 76 | ||
| 76 | /* | 77 | /* |
| 77 | * sqe->fsync_flags | 78 | * sqe->fsync_flags |