METHOD, APPARATUS, AND SYSTEM FOR OPERATING SHARED RESOURCE IN ASYNCHRONOUS MULTIPROCESSING SYSTEM

• US 20130290286A1
• Filed: 04/25/2013
• Published: 10/31/2013
• Est. Priority Date: 04/27/2012
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: Su, Qing, Liu, Yu, Guo, Xiancheng, Liu, Hu
• Granted Patent: US 9,519,652 B2
• Time in Patent Office: Days
• US Class Current: 707/704
• CPC Class Codes: G06F 13/1663 Access to shared memory
• CPC Class Codes: G06F 16/1774 Locking methods, e.g. locking methods for file systems allowing shared and concurrent access to files

Abstract

Technical effects of a method, an apparatus, and a system for operating a shared resource in an asynchronous multiprocessing system that are provided in the present invention are as follows: A processor in an asynchronous multiprocessing system implements an operation on a shared resource by locking a hardware resource lock, and the hardware resource lock is implemented by a register; in this way, a bus in the asynchronous multiprocessing system does not need to support a synchronization operation, and the processor also does not need to have a feature of supporting a synchronization operation, and is capable of implementing the operation on the shared resource only in a manner of accessing the register, which simplifies the operation on the shared resource by the processor in the asynchronous multiprocessing system, enlarges a selection range of the processor in the asynchronous multiprocessing system, and further improves flexibility of the asynchronous multiprocessing system.

Claims

1. A method for operating a shared resource in an asynchronous multiprocessing system, comprising:

receiving, by a hardware resource lock, a lock command sent by a first processor in the asynchronous multiprocessing system; and

ignoring, by the hardware resource lock when being in a locked state, the lock command, and setting, by the hardware resource lock when being in an unlocked state, a state of the hardware resource lock to a state of being locked by the first processor, so that the first processor operates the shared resource.

2. The method according to claim 1, wherein before receiving, by a hardware resource lock, a lock command sent by a first processor in the asynchronous multiprocessing system, the method further comprises:

receiving a first query command sent by the first processor, wherein the first query command is used to query a state of the hardware resource lock; and

returning the state of the hardware resource lock to the first processor.

3. The method according to claim 1, wherein after the ignoring, by the hardware resource lock when being in a locked state, the lock command, and setting, by the hardware resource lock when being in an unlocked state, the state of the hardware resource lock to a state of being locked by the first processor, so that the first processor operates the shared resource, the method further comprises:

receiving a second query command sent by the first processor, wherein the second query command is used to query whether the hardware resource lock is locked by the first processor; and

returning a lock result to the first processor.

4. The method according to claim 1, wherein after the setting, by the hardware resource lock when being in an unlocked state, the state of the hardware resource lock to a state of being locked by the first processor, so that the first processor operates the shared resource, the method further comprises:

receiving an unlock command sent by the first processor; and

restoring, by the hardware resource lock, the state of the hardware resource lock to the unlocked state according to the unlock command.

5. The method according to claim 1, wherein after receiving, by a hardware resource lock, a lock command sent by a first processor in the asynchronous multiprocessing system, the method further comprises:

receiving a lock command sent by a second processor in the asynchronous multiprocessing system; and

ignoring, by the hardware resource lock, the lock command sent by the second processor.

6. The method according to claim 5, wherein before receiving a lock command sent by a second processor in the asynchronous multiprocessing system, the method further comprises:

receiving a first query command sent by the second processor, wherein the first query command sent by the second processor is used to query a state of the hardware resource lock; and

returning the state of the hardware resource lock to the second processor.

7. The method according to claim 5, wherein after ignoring, by the hardware resource lock, the lock command sent by the second processor, the method further comprises:

receiving a second query command sent by the second processor, wherein the second query command sent by the second processor is used to query whether the hardware resource lock is locked by the second processor; and

returning a lock result to the second processor.

8. A method for operating a shared resource in an asynchronous multiprocessing system, comprising:

delivering, by a first processor in the asynchronous multiprocessing system, a lock command to a hardware resource lock when the hardware resource lock is in an unlocked state, so as to lock the hardware resource lock, wherein the hardware resource lock is implemented by a register; and

operating, by the first processor, the shared resource when the hardware resource lock is in a state of being locked by the first processor.

9. The method according to claim 8, wherein before the operating, by the first processor, the shared resource, the method further comprises:

reading, by the first processor, a state of the hardware resource lock.

10. The method according to claim 8 , wherein after the operating, by the first processor, the shared resource, the method further comprises:

sending, by the first processor, an unlock command to the hardware resource lock, so that the hardware resource lock restores the state of the hardware resource lock to the unlocked state.

11. A hardware resource lock, comprising:

a lock state register, configured to provide a state of the hardware resource lock; and

a lock register, configured to receive a lock command sent by a first processor in an asynchronous multiprocessing system, ignore the lock command when the hardware resource lock is in a locked state, and set, when the hardware resource lock is in an unlocked state, the state of the hardware resource lock to a state of being locked by the first processor, so that the first processor operates a shared resource.

12. The hardware resource lock according to claim 11, wherein the lock state register is further configured to receive a first query command sent by the first processor, wherein the first query command is used to query a state of the hardware resource lock, and return the state of the hardware resource lock to the first processor.

13. The hardware resource lock according to claim 11, wherein the lock state register is further configured to receive a second query command sent by the first processor, wherein the second query command is used to query whether the hardware resource lock is locked by the first processor, and return a lock result to the first processor.

14. The hardware resource lock according to claim 11, further comprising:

an unlock register, configured to set, when the hardware resource lock is in an unlocked state, the state of the hardware resource lock to a state of being locked by the first processor, so that after the first processor operates the shared resource, the hardware resource lock receives an unlock command sent by the first processor and restores the state of the hardware resource lock to the unlocked state according to the unlock command.

15. The hardware resource lock according to claim 11, wherein the lock register is further configured to, after receiving the lock command sent by the first processor in the asynchronous multiprocessing system, receive a lock command sent by a second processor in the asynchronous multiprocessing system, and ignore the lock command sent by the second processor.

16. The hardware resource lock according to claim 15, wherein the lock state register is further configured to, before the lock register receives the lock command sent by the second processor in the asynchronous multiprocessing system, receive a first query command sent by the second processor, wherein the first query command sent by the second processor is used to query a state of the hardware resource lock, and return the state of the hardware resource lock to the second processor.

17. The hardware resource lock according to claim 15, wherein the lock state register is further configured to, after the lock register ignores the lock command sent by the second processor, receive a second query command sent by the second processor, wherein the second query command sent by the second processor is used to query whether the hardware resource lock is locked by the second processor, and return a lock result to the second processor.

18. A processor in an asynchronous multiprocessing system, comprising:

a lock unit, configured to deliver a lock command to a hardware resource lock when the hardware resource lock is in an unlocked state, so as to lock the hardware resource lock, wherein the hardware resource lock is implemented by a register; and

a resource operating unit, configured to operate a shared resource when the hardware resource lock is in a state of being locked by the processor.

19. The processor according to claim 18, further comprising:

a lock readback unit, configured to read a state of the hardware resource lock before the resource operating unit operates the shared resource.

20. The processor according to claim 18, further comprising:

an unlock unit, configured to send an unlock command to the hardware resource lock after the resource operating unit operates the shared resource, so that the hardware resource lock restores the state of the hardware source lock to the unlocked state.