EFFICIENT MECHANISM FOR TERMINATING APPLICATIONS

• US 20090307710A1
• Filed: 06/20/2008
• Published: 12/10/2009
• Est. Priority Date: 06/06/2008
• Status: Active Grant

• Current Assignee: Apple Inc.
• Original Assignee: Apple Inc.
• Inventors: Zarzycki, David Alexander, Rothert, Curtis
• Granted Patent: US 8,296,776 B2
• Time in Patent Office: Days
• US Class Current: 719/312
• CPC Class Codes: G06F 9/485 Task life-cycle, e.g. stopping, restarting, resuming execution G06F9/4881 takes precedence

Abstract

An efficient mechanism for terminating applications of a data processing system is described herein. In one embodiment, in response to a request for exiting from an operating environment of a data processing system, an operating system examines an operating state associated with an application running within the operating environment, where the operating state is stored at a predetermined memory location shared between the operating system and the application. The operating system immediately terminates the application if the operating state associated with the application indicates that the application is safe for a sudden termination. Otherwise, the operating system defers terminating the application if the operating state associated with the application indicates that the application is unsafe for the sudden termination. Other methods and apparatuses are also described.

Claims

1. A machine-implemented method for terminating an application of a data processing system, the method comprising:

in response to a request for exiting from an operating environment of a data processing system, an operating system examining an operating state associated with an application running within the operating environment, the operating state being stored at a predetermined memory location shared between the operating system and the application;

the operating system immediately terminating the application if the operating state associated with the application indicates that the application is safe for a sudden termination; and

the operating system deferring terminating the application if the operating state associated with the application indicates that the application is unsafe for the sudden termination.

2. The method of claim 1, wherein the request for exiting from the operating environment is one of a request for shutting down the data processing system and a request for logging out from a desktop environment of the data processing system.

3. The method of claim 1, wherein the predetermined memory location is only accessible by one of the application and the operating system at a given time.

4. The method of claim 1, wherein when the application enters a critical section, the application updates the operating state stored at the predetermined memory location to indicate that the application is unsafe for sudden termination, and wherein when the application exits from the critical section, the application updates the operating state stored at the predetermined memory location to indicate that the application is possible for sudden termination.

5. The method of claim 4, further comprising maintaining the operating state of the application using a counter stored in the predetermined memory location, wherein a predetermined value or a predetermined range of values of the counter is used to indicate whether the application is safe for sudden termination.

6. The method of claim 5, wherein when the application enters the critical section, the application increments a value of the counter to indicate that the application is unsafe for sudden termination, and wherein when the application exits from the critical section, the application decrements the value of the counter to indicate that the application is possible for sudden termination.

7. The method of claim 6, further comprising, in response to the request for exiting the operating environment of the data processing system, the operating system decrementing the value of the counter, wherein if the value of the counter is less than zero, the application is safe for sudden termination, and wherein if the value of the counter is greater than or equals to zero, the application is unsafe for sudden termination.

8. The method of claim 7, further comprising, if the application is unsafe for sudden termination, the operating system requesting via an application programming interface (API) the application to exit itself.

9. The method of claim 7, further comprising setting an initial value for the counter when the application is launched based on a configuration of a metadata file associated with the application.

10. The method of claim 9, wherein the counter is initialized as zero if the configuration of the metadata file is set to a first predetermined value, and wherein the counter is initialized as one if the configuration of the metadata file is set to a second predetermined value.

11. A machine-readable medium having instructions stored therein, which when executed by a machine, cause the machine to perform a method for terminating an application of a data processing system, the method comprising:

in response to a request for exiting from an operating environment of a data processing system, an operating system examining an operating state associated with an application running within the operating environment, the operating state being stored at a predetermined memory location shared between the operating system and the application;

the operating system immediately terminating the application if the operating state associated with the application indicates that the application is safe for a sudden termination; and

the operating system deferring terminating the application if the operating state associated with the application indicates that the application is unsafe for the sudden termination.

12. The machine-readable medium of claim 11, wherein the request for exiting from the operating environment is one of a request for shutting down the data processing system and a request for logging out from a desktop environment of the data processing system.

13. The machine-readable medium of claim 11, wherein the predetermined memory location is only accessible by one of the application and the operating system at a given time.

14. The machine-readable medium of claim 11, wherein when the application enters a critical section, the application updates the operating state stored at the predetermined memory location to indicate that the application is unsafe for sudden termination, and wherein when the application exits from the critical section, the application updates the operating state stored at the predetermined memory location to indicate that the application is possible for sudden termination.

15. The machine-readable medium of claim 14, wherein the method further comprises maintaining the operating state of the application using a counter stored in the predetermined memory location, wherein a predetermined value or a predetermined range of values of the counter is used to indicate whether the application is safe for sudden termination.

16. The machine-readable medium of claim 15, wherein when the application enters the critical section, the application increments a value of the counter to indicate that the application is unsafe for sudden termination, and wherein when the application exits from the critical section, the application decrements the value of the counter to indicate that the application is possible for sudden termination.

17. The machine-readable medium of claim 16, wherein the method further comprises, in response to the request for exiting the operating environment of the data processing system, the operating system decrementing the value of the counter, wherein if the value of the counter is less than zero, the application is safe for sudden termination, and wherein if the value of the counter is greater than or equals to zero, the application is unsafe for sudden termination.

18. The machine-readable medium of claim 17, wherein the method further comprises, if the application is unsafe for sudden termination, the operating system requesting via an application programming interface (API) the application to exit itself.

19. The machine-readable medium of claim 17, wherein the method further comprises setting an initial value for the counter when the application is launched based on a configuration of a metadata file associated with the application, wherein the counter is initialized as zero if the configuration of the metadata file is set to a first predetermined value, and wherein the counter is initialized as one if the configuration of the metadata file is set to a second predetermined value.

20. A data processing system, comprising:

a processor;

a memory;

an operating system running within the memory and executed by the processor, the operating system having an application termination logic;

a plurality of applications running within the memory and executed by the processor, the plurality of applications communicatively coupled to the operating system,

wherein in response to a request for shutting down or logging out from the data processing system, the application termination logic examines an operating state associated with each of the applications and stored at a predetermined location of the memory shared between the operating system and each application,

wherein the application termination logic immediately terminates an application if the operating state associated with the application indicates that the application is safe for a sudden termination, and

wherein the application termination logic defers terminating the application if the operating state associated with the application indicates that the application is unsafe for the sudden termination.