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| author |   Jens Axboe <axboe@kernel.dk> | 2019-09-17 12:26:57 -0600 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2019-09-18 10:43:22 -0600 |
| commit | 5262f567987d3c30052b22e78c35c2313d07b230 (patch) | |
| tree | 6ec115ce7e1a08fc7d3c07fac9ccae82b0871f28 /include/uapi/linux | |
| parent | io_uring: use cond_resched() in sqthread (diff) | |
| download | linux-dev-5262f567987d3c30052b22e78c35c2313d07b230.tar.xz linux-dev-5262f567987d3c30052b22e78c35c2313d07b230.zip | |
io_uring: IORING_OP_TIMEOUT support
There's been a few requests for functionality similar to io_getevents()
and epoll_wait(), where the user can specify a timeout for waiting on
events. I deliberately did not add support for this through the system
call initially to avoid overloading the args, but I can see that the use
cases for this are valid.
This adds support for IORING_OP_TIMEOUT. If a user wants to get woken
when waiting for events, simply submit one of these timeout commands
with your wait call (or before). This ensures that the application
sleeping on the CQ ring waiting for events will get woken. The timeout
command is passed in as a pointer to a struct timespec. Timeouts are
relative. The timeout command also includes a way to auto-cancel after
N events has passed.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include/uapi/linux')
| -rw-r--r-- | include/uapi/linux/io_uring.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/uapi/linux/io_uring.h b/include/uapi/linux/io_uring.h index 96ee9d94b73e..ea57526a5b89 100644 --- a/include/uapi/linux/io_uring.h +++ b/include/uapi/linux/io_uring.h @@ -28,6 +28,7 @@ struct io_uring_sqe { __u16 poll_events; __u32 sync_range_flags; __u32 msg_flags; + __u32 timeout_flags; }; __u64 user_data; /* data to be passed back at completion time */ union { @@ -61,6 +62,7 @@ struct io_uring_sqe { #define IORING_OP_SYNC_FILE_RANGE 8 #define IORING_OP_SENDMSG 9 #define IORING_OP_RECVMSG 10 +#define IORING_OP_TIMEOUT 11 /* * sqe->fsync_flags |