linux kernel internals book

- 设置关注变量 - 18.9 detection system 18.9.1 using UID as selection criteria if (current->uid! = 7777) { / old algorithm / Else { / New Algorithm / } 18.9.2 Using condition variables You can use conditional variables if your code is not process-independent, or if you want to have a mechanism that can be used for all situations to control an attribute. This is easier than using UID, just to create a global variable as a conditional selector

_ Get _ priority _ Max () returns the maximum and minimum precedence for a given scheduling policy 2. System calls related to processor bindings Linux Scheduler provides mandatory processor binding mechanism In a CPUs _ allowed bitmask in a task _ struct Sched_setaffinity () sets a bitmask of different combinations of one or several bits Sched _ Getaffinity () returns the current cpus_ allowed bit mask 3. Discard Proces

到其中的一个子进程退出，此时函数返回该子进程的PID。 When you release the process descriptor, you need to call Release_task (). 3.5.2 Orphan Process Overview: The parent process exits before the process, leaving behind the child process, the orphan process The workaround: Finds a new parent process within the current thread group for the orphan process, or directly with Init as its parent process Call Order: - do_exit()-- - >forget_original_parent()- - >find_new_p

is in the process context when it executes system calls.(2) The current pointer points to the present task, which is the process that raised the system call.(3) In the context of the process, the kernel can hibernate and can be preempted.(4) System_call () is responsible for switching to user space and letting the user continue execution when the system call returns.5.6.1 The last step of binding a system call:(1) Add the table entry in the system ca

entries that do not copy the parent process.The implementation of the Vfork () system call is done by passing a special flag to the clone () system call.3.4 Implementation of threads in Linux3.4.1 Creating ThreadsCreating a thread is similar to creating a normal process, except that you need to pass some parameter flags when invoking clone () to indicate which resources need to be shared:Clone (CLONE_VM | Clone_fs | Clone_files | clone_sighand,0);The parameter flags passed to clone () determine

Linux Kernel programming paper book recommendation-general Linux technology-Linux programming and kernel information, the following is a detailed description. These are the books read by experts. The following books are popular. I

Lea EAX,[EBX+ECX] Leal (%EBX,%ECX),%eax Sub eax,[ebx+ecx*4h-20h] subl-0x20 (%ebx,%ecx,0x4),%eax As can be seen from the table, the grammar of at-and-T is more obscure, because [Base+index*scale+disp] can see its meaning at a glance, and disp (Base,index,scale) is unlikely to do so.This approach is often used to access a field within a particular element of the data structure array, where base is the starting address of the array, and scale is the s

queue, and then call Schedule () to select and execute a different process.The process of waking up is just the opposite of the process being set to executable state, and then moving from the wait queue to the executable red-black tree.4.6 Preemption and Context switching4.6.1 User preemptionArises in the following cases:When the user space is returned from the system, when the user space is returned from the interrupt handler;4.6.2 kernel preemption

Compile the linux0.00 kernel (full Linux Kernel Analysis-based on the 0.12 kernel) I have bought a fully-analyzed Linux kernel written by Zhao Ke-based on the 0.12 kernel. It seems that

and barrier () on UP Smp_mb () Provides the mb () function on SMP and the barrier () function on UP. Barrier () Prevents compilers from crossing barriers to optimize loading or storage operations To make the preceding Small Example run correctly, use the function in the preceding table to modify the function of thread: /** Assume the operations on A and B in thread a */void Thread_A () {a = 5; mb ();/** mb () ensure that all the operations on loading and storing v

Tags: socket source x86 INF location Architecture level pre compositionThe world is sad to end, the Octopus elder brother also retired, even the non-sincerity does not disturb in the worship diggers also suddenly a lot less. This "Linux kernel cultivation of the road" in excellence, when, China-pub has also been on sale, although serious literature, but in order to ensure fluency, most of the text I also ar

Linux Kernel Design and Implementation of Reading Notes, Linux Kernel Chapter 3 Process Management 1. fork system calls are returned twice from the kernel: one is returned to the sub-process and one is returned to the parent process. the task_struct structure is allocated by

:★★★★★Purchase at Dangdang | excellent purchaseAdvanced Programming in UNIX environment is a must-have book for Unix/Linux programmers. It can be said that if a Linux programmer has not read this book, it is as though Christians have not read the Bible, which is hard to understand. This

*/0809 #include This simplest kernel module only contains the declaration of kernel module Loading Function, uninstalling function, and GPL v2 permission and some descriptions, located in the/kernel/drivers/hello directory of the matching source code in this book. Compile it to generate hello. ko target file, throug