diff options
Diffstat (limited to 'drivers/staging/android/sync.h')
| -rw-r--r-- | drivers/staging/android/sync.h | 36 |
1 files changed, 29 insertions, 7 deletions
diff --git a/drivers/staging/android/sync.h b/drivers/staging/android/sync.h index 4f199387146..943f414b3f3 100644 --- a/drivers/staging/android/sync.h +++ b/drivers/staging/android/sync.h @@ -159,6 +159,10 @@ struct sync_fence { struct list_head sync_fence_list; }; +struct sync_fence_waiter; +typedef void (*sync_callback_t)(struct sync_fence *fence, + struct sync_fence_waiter *waiter); + /** * struct sync_fence_waiter - metadata for asynchronous waiter on a fence * @waiter_list: membership in sync_fence.waiter_list_head @@ -168,10 +172,15 @@ struct sync_fence { struct sync_fence_waiter { struct list_head waiter_list; - void (*callback)(struct sync_fence *fence, void *data); - void *callback_data; + sync_callback_t callback; }; +static inline void sync_fence_waiter_init(struct sync_fence_waiter *waiter, + sync_callback_t callback) +{ + waiter->callback = callback; +} + /* * API for sync_timeline implementers */ @@ -284,16 +293,29 @@ void sync_fence_install(struct sync_fence *fence, int fd); /** * sync_fence_wait_async() - registers and async wait on the fence * @fence: fence to wait on - * @callback: callback - * @callback_data data to pass to the callback + * @waiter: waiter callback struck * * Returns 1 if @fence has already signaled. * - * Registers a callback to be called when @fence signals or has an error + * Registers a callback to be called when @fence signals or has an error. + * @waiter should be initialized with sync_fence_waiter_init(). */ int sync_fence_wait_async(struct sync_fence *fence, - void (*callback)(struct sync_fence *, void *data), - void *callback_data); + struct sync_fence_waiter *waiter); + +/** + * sync_fence_cancel_async() - cancels an async wait + * @fence: fence to wait on + * @waiter: waiter callback struck + * + * returns 0 if waiter was removed from fence's async waiter list. + * returns -ENOENT if waiter was not found on fence's async waiter list. + * + * Cancels a previously registered async wait. Will fail gracefully if + * @waiter was never registered or if @fence has already signaled @waiter. + */ +int sync_fence_cancel_async(struct sync_fence *fence, + struct sync_fence_waiter *waiter); /** * sync_fence_wait() - wait on fence |