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【正文】 nt to taskstate = state。 the task is not running nor is it eligible to run. This occurs if the task receives the SIGSTOP, SIGTSTP, SIGTTIN, or SIGTTOU signal or if it receives any signal while it is being debugged. 5 Manipulating the Current Process State Kernel code often needs to change a process39。s state to TASK_RUNNING. The process also awakes prematurely and bees runnable if it receives a signal. (3) TASK_UNINTERRUPTIBLE This state is identical to TASK_INTERRUPTIBLE except that it does not wake up and bee runnable if it receives a signal. This is used in situations where the process must wait without interruption or when the event is expected to occur quite quickly. Because the task does not respond to signals in this state, this state is less often used than TASK_INTERRUPTIBLE (4)TASK_ZOMBIE The task has terminated, but its parent has not yet issued a wait4() system call. The task39。 it is either currently running or on a runqueue waiting to run. This is the only possible state for a process executing in userspace。 Contrast this approach with that taken by PowerPC (IBM39。s tHRead_info structure is allocated at the end of its stack. The task element of the structure is a pointer to the task39。 }。 unsigned long previous_esp。 mm_segment_t addr_limit。 __u32 cpu。 unsigned long flags。s state, and much more 2 Allocating the Process Descriptor The task_struct structure is allocated via the slab allocator to provide object reuse and cache coloring Prior to the kernel series, struct task_struct was stored at the end of the kernel stack of each process. This allowed architectures with few registers, such as x86, to calculate the location of the process descriptor via the stack pointer without using an extra register to store the location. With the process descriptor now dynamically created via the slab XXX 工業(yè)大學(xué)本科畢業(yè)設(shè)計(jì)外文文獻(xiàn)翻譯 3 allocator, a new structure, struct thread_info, was created that again lives at the bottom of the stack and at the top of the stack . The new structure also makes it rather easy to calculate offsets of its values for use in assembly code. The thread_info structure is defined on x86 in asm/ as struct thread_info { struct task_struct *task。s point of view. 1 Process Descriptor and the Task Structure The kernel stores the list of processes in a circular doubly linked list called the task list. Each element in the task list is a process descriptor of the type struct task_struct, which is defined in linux/.The process descriptor contains all the information about a specific process. The task_struct is a relatively large data structure, at around kilobytes on a 32bit machine. This size,however, is quite small considering that the structure contains all the information that the kernel has and needs about a process. The process descriptor contains the data that describes the executing programopen files, the process39。 （ 本科畢業(yè)設(shè)計(jì)外文文獻(xiàn)翻譯 學(xué)校代碼： XXX 學(xué) 號(hào)： XXX 學(xué) 生 姓 名 ： XXX 學(xué) 院 ： 信 息 工 程 學(xué) 院 系 別： 計(jì) 算 機(jī) 系 專 業(yè)： 軟 件 工 程 班 級(jí)： 軟件 06 指 導(dǎo) 教 師 ： XXX 副 教 授 二 〇 一 〇 年 六 月 XXX 工業(yè)大學(xué)本科畢業(yè)設(shè)計(jì)外文文獻(xiàn)翻譯 1 Process Ma
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