Methods and systems for managing asynchronous function calls

1. A method comprising, by an operating system executing on a computing device:

determining that a first fiber is requesting to wait for a future associated with one or more results generated by an asynchronous function call, wherein the asynchronous function call is called by a thread to execute a task without being blocked while the task is being completed;

pausing execution of the first fiber until the future is completed, wherein the future is completed when the asynchronous function call generates the one or more results;

enqueuing the paused first fiber in a local queue associated with the future that the first fiber is waiting for;

determining that the future is completed;

accessing one or more queued fibers in the local queue of the future, wherein the one or more queued fibers comprise the first fiber;

prioritizing execution of the one or more queued fibers in the local queue over fibers in a global queue based on a priority policy;

resuming execution of the one or more queued fibers.

2. The method of claim 1 , wherein the one or more queued fibers further comprise a second fiber whose execution is paused until the one or more results are completed.

3. The method of claim 1 , further comprising:

enqueuing the one or more queued fibers on an execution queue of a thread;

wherein the resuming execution of the one or more queued fibers is performed by the thread.

4. The method of claim 3 , further comprising:

selecting at least one executable fiber from the execution queue or the global queue based on the priority policy, wherein the execution queue has a higher priority than the global queue.

5. The method of claim 1 , wherein the one or more results are associated with a second local queue configured to store work items that are waiting for the one or more results to complete.

6. The method of claim 5 , further comprising:

in response to determining that the one or more results are completed, accessing one or more work items in the second local queue of the one or more results; and

resuming execution of the one or more work items.

7. The method of claim 6 , further comprising:

enqueuing the one or more work items on an execution queue of a thread;

wherein the resuming execution of the one or more queued work items is performed by the thread.

8. The method of claim 7 , further comprising:

selecting at least one work item for execution from the execution queue or the global queue based on the priority policy, wherein the execution queue has a higher priority than the global queue.

9. One or more computer-readable non-transitory storage media embodying software that is operable when executed to:

determine that a first fiber is requesting to wait for one or more results of an asynchronous function call, wherein the asynchronous function call is called by a thread to execute a task without being blocked while the task is being completed;

pause execution of the first fiber until the one or more results are completed;

enqueue the paused first fiber in a local queue associated with the one or more results that the first fiber is waiting for;

determine that the one or more results are completed;

access one or more queued fibers in the local queue of the one or more results, wherein the one or more queued fibers comprise the first fiber;

prioritizing execution of the one or more queued fibers in the local queue over fibers in a global queue based on a priority policy; and

resume execution of the one or more queued fibers.

10. The media of claim 9 , wherein the one or more queued fibers further comprise a second fiber whose execution is paused until the one or more results are completed.

11. The media of claim 9 , wherein the media is configured to: enqueue the one or more queued fibers on an execution queue of a thread;

wherein the resuming execution of the one or more queued fibers is performed by the thread.

12. The media of claim 11 , wherein the media is configured to:

select at least one executable fiber from the execution queue or the global queue based on the priority policy, wherein the execution queue has a higher priority than the global queue.

13. The media of claim 9 , wherein the one or more results are associated with a second local queue configured to store work items that are waiting for the one or more results to complete.

14. The media of claim 13 , wherein the media is configured to:

in response to determining that the one or more results are completed, access one or more work items in the second local queue of the one or more results; and

resume execution of the one or more work items.

15. The media of claim 14 , wherein the media is configured to:

enqueue the one or more work items on an execution queue of a thread;

wherein the resuming execution of the one or more queued work items is performed by the thread.

16. The media of claim 15 , wherein the media is configured to:

select at least one work item for execution from the execution queue or the global queue based on the priority policy, wherein the execution queue has a higher priority than the global queue.

17. A system comprising:

one or more processors; and

one or more computer-readable non-transitory storage media coupled to one or more of the processors and comprising instructions operable when executed by one or more of the processors to cause the system to:

determine that a first fiber/work item is requesting to wait for one or more results of an asynchronous function call, wherein the asynchronous function call is called by a thread to execute a task without being blocked while the task is being completed;

pause execution of the first fiber/work item until the one or more results are completed;

enqueue the paused first fiber/work item in a local queue associated with the one or more results that the first fiber is waiting for;

determine that the one or more results are completed;

access one or more queued fibers/works item in the local queue of the one or more results, wherein the one or more queued fibers/work items comprise the first fiber/work item;

prioritizing execution of the one or more queued fibers in the local queue over fibers in a global queue based on a priority policy; and

resume execution of the one or more queued fibers/work items.

18. The system of claim 17 , wherein the one or more queued fibers/work items further comprise a second fiber/work item whose execution is paused until the one or more results are completed.

19. The system of claim 17 , wherein the system is configured to:

enqueue the one or more queued fibers/work items on an execution queue of a thread;

wherein the resuming execution of the one or more queued fibers/work items is performed by the thread.

20. The system of claim 19 , wherein the system is configured to:

select at least one executable fiber/work item from the execution queue or the global queue based on the priority policy, wherein the execution queue has a higher priority than the global queue.