Method and device for preventing thread from blocking

Abstract

The invention discloses method and device for preventing a thread from blocking. The method includes: after a system starts, replacing all application program interface functions used for awaiting events to be triggered so that, when one replaced application program interface function is transferred by a thread, if that the length of set waiting time is unlimited is determined, changing the length of the set waiting time to a preset value; or after a system starts, replacing all application program interface functions used for ending events so that, when one replaced application program interface function is transferred by a thread, if that critical sections occupied by the thread to be ended is not released is determined, then releasing the critical sections; or performing thread poll periodically, if that the length of blocking time of a thread exceeds a preset length of time and the thread is blocked on transferring of application program interface functions used for occupying critical sections, then releasing a critical section corresponding to a first parameter of the transferred application program interface functions. By the method, successfully execution of the program can be guaranteed.

Description

technical field [0001] The invention relates to computer technology, in particular to a method and device for preventing thread from blocking. Background technique [0002] Each program running on the system is a process, and each process can include one or more threads, and a thread is the smallest unit of program execution flow. [0003] The execution order of instructions within each thread is fixed. figure 1 It is a schematic diagram of an instruction execution method in an existing thread. Such as figure 1 As shown, instruction 1 is executed first, then instruction 2 is executed, and so on until instruction n is executed (assuming n is greater than 2), and the process ends. [0004] Generally, a program including a plurality of threads is called a multi-threaded program. In a multi-threaded program, when multiple threads need to access the same piece of data, that is, shared data, because the order of execution of instructions is different, locks are required to imp...

AI Technical Summary

Problems solved by technology

like Figure 5 As shown, assume that thread A is set to trigger event A only after event B is triggered, but for some reason, event B has not been triggered, then thread A will wait indefinitely for the triggering of event B, correspondingly, Therefore, event A cannot be triggered, and thread B is set to wait until event A is triggered before subsequent processing can be performed. Therefore, thread B will wait indefinitely for event A to be triggered, resulting in thread B being blocked, etc.

[0011] Whether it is deadlock, lock abandonment or blocking caused by waiting for an event to trigger, the program cannot be executed smoothly.

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