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Method for detecting and intervening deadlock of single-threading microprocessor

A microprocessor, single-threaded technology, applied in the direction of program synchronization, multi-programming device, resource allocation, etc., can solve the problems of multi-threaded microprocessors being on a par, cannot be applied to single-threaded microprocessor systems, etc., to overcome deadlocks Detect and intervene system shortcomings, save resources, and improve performance

Inactive Publication Date: 2006-08-02
FUJIAN NORMAL UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

However, due to the lack of resources of single-threaded microprocessors, such as a typical MCS-51 single-chip microcomputer, there are only 256 bytes of RAM and 2 timers on the chip, and the PIC series single-chip microcomputer of Microchip Company has only about 1K bytes on the chip. RAM and 2-4 timers, etc., cannot be compared with multi-threaded microprocessors, so the deadlock detection and intervention system at the cost of resources in multi-threaded systems obviously cannot be applied to single-threaded microprocessor systems

Method used

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  • Method for detecting and intervening deadlock of single-threading microprocessor
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  • Method for detecting and intervening deadlock of single-threading microprocessor

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Embodiment Construction

[0015] figure 1 It is a schematic diagram of the deadlock detection structure of the present invention. In the figure, the data storage device 101 saves the maximum CPU time requirement of each specific task, which can be set in advance or dynamically adjusted during program running. The nth task running 102 of the single-threaded microprocessor indicates that the current task takes up all the time of the CPU, and only when a processor interrupt occurs, the CPU time is temporarily handed over to the interrupt service program for use, and the interrupt service program performs on-site protection and other processing to complete After that, give the CPU time to the current nth task to continue using the CPU time. The microprocessor physical timing resource 103 is an important physical resource of the present invention, works in an interrupt mode, and deprives the CPU usage time of the current task when an interrupt occurs.

[0016] figure 2 It is a flow chart of the task modu...

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Abstract

Present invention relates to a simple microprocessor deadlock detection and intervene methodú¼for solving deadlock in system. It contains opening timer resource and initialisation utilized physics internal storage location timer before initiating task obtaining CPU time, proceeding accumulation clocking to physics internal storage location timer in timer interruption service program according to current task running status, continuously circular checking CPU occupied utilized time unless current operational task normal ending, if exceeding configured maximal operation time, then regarding deadlock occurring, thereby ending deadlock task and taking CPU time to followed task to continue execute. Said technology only uses less resource, such as a whole flag bit, a physics memory timer and timer resource.

Description

technical field [0001] The invention relates to the technical field of microprocessors, in particular to a deadlock detection and intervention method for a typical single-threaded microprocessor system such as a single-chip microcomputer. Background technique [0002] The thread of a microprocessor refers to the execution process of a program. In a single-threaded microprocessor such as a single-chip microcomputer, a program can only execute one instruction at present. This single-thread microprocessor has been widely used in some portable and remote unattended instrumentation systems because of its small size, powerful functions, low price and convenient development. [0003] The deadlock described above is generally believed to exist in multi-threaded microprocessors corresponding to single-threaded microprocessors. Each thread in two or more threads is waiting for the other thread to release a certain lock. Commonly used resources are blocked, so that each thread cannot ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F9/52G06F9/50
Inventor 吴允平蔡声镇吴进营苏伟达李汪彪
Owner FUJIAN NORMAL UNIV
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