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| author | Stefan Hajnoczi <stefanha@redhat.com> | 2016-12-01 19:26:49 +0000 |
|---|---|---|
| committer | Stefan Hajnoczi <stefanha@redhat.com> | 2017-01-03 16:38:50 +0000 |
| commit | 684e508c23d28af8d6ed2c62738a0f60447c8274 (patch) | |
| tree | acf9dd6f848c5419b756d30124f9727dafb3553d /include/block/aio.h | |
| parent | aff8fd18f1786fc5af259a9bc0077727222f51ca (diff) | |
| download | qemu-684e508c23d28af8d6ed2c62738a0f60447c8274.tar.gz | |
aio: add .io_poll_begin/end() callbacks
The begin and end callbacks can be used to prepare for the polling loop
and clean up when polling stops. Note that they may only be called once
for multiple aio_poll() calls if polling continues to succeed. Once
polling fails the end callback is invoked before aio_poll() resumes file
descriptor monitoring.
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-id: 20161201192652.9509-11-stefanha@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'include/block/aio.h')
| -rw-r--r-- | include/block/aio.h | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/include/block/aio.h b/include/block/aio.h index 349143f6d9..3817d179fd 100644 --- a/include/block/aio.h +++ b/include/block/aio.h @@ -137,6 +137,9 @@ struct AioContext { /* Maximum polling time in nanoseconds */ int64_t poll_max_ns; + /* Are we in polling mode or monitoring file descriptors? */ + bool poll_started; + /* epoll(7) state used when built with CONFIG_EPOLL */ int epollfd; bool epoll_enabled; @@ -339,6 +342,14 @@ void aio_set_fd_handler(AioContext *ctx, AioPollFn *io_poll, void *opaque); +/* Set polling begin/end callbacks for a file descriptor that has already been + * registered with aio_set_fd_handler. Do nothing if the file descriptor is + * not registered. + */ +void aio_set_fd_poll(AioContext *ctx, int fd, + IOHandler *io_poll_begin, + IOHandler *io_poll_end); + /* Register an event notifier and associated callbacks. Behaves very similarly * to event_notifier_set_handler. Unlike event_notifier_set_handler, these callbacks * will be invoked when using aio_poll(). @@ -352,6 +363,15 @@ void aio_set_event_notifier(AioContext *ctx, EventNotifierHandler *io_read, AioPollFn *io_poll); +/* Set polling begin/end callbacks for an event notifier that has already been + * registered with aio_set_event_notifier. Do nothing if the event notifier is + * not registered. + */ +void aio_set_event_notifier_poll(AioContext *ctx, + EventNotifier *notifier, + EventNotifierHandler *io_poll_begin, + EventNotifierHandler *io_poll_end); + /* Return a GSource that lets the main loop poll the file descriptors attached * to this AioContext. */ |