security study guide free

. Garbage collectionvoid Garbage (){int *p = (int *) Malloc (15213)Return}garbage collector:is a dynamic storage allocator that automatically frees allocated blocks that are no longer needed by the program. These blocks are called garbage. The process of automatically reclaiming heap storage is called garbage collection. The following functions are used in the description of Marksweep: where PTR is defined as typedef void *PTRPtrisptr (PTR p): if p points to a word in an allocated block, it ret

also very interesting (the original book uses 19 pages of volume to describe the principle and action of the dispenser), smart programmers use a number of techniques to achieve, refer to p568 page.9.10 garbage Collection (recycling)The garbage collector is a dynamic allocator that automatically frees the allocated blocks that are no longer needed by these programs. Garbage collection dates back to the the 1960s early-morning Lisp system developed at MIT. He is an important part of modern langua

Information Security system design basics first week study summaryI. Introduction to the History of experiments1. Knowledge points1) Operating system: Connect hardware and applications as a bridge between the computer tables, including system calls and cores.2) Linux: Developed by the first, the original purpose isCompared to Windows, the main advantages (and some people's serious disadvantage) are-mostly o

Information Security System Design Foundation 14th Week study Summary"Learning Time: 7 hours""Learning content: chapter9--virtual Memory"First, the content of the textbook Understanding (Personal Understanding section with "" marked) 1. Virtual Storage (VM) function : The main memory is considered as a cache of the address space stored on disk, only the active area is protected in main m

address to a low address. Each invocation of each function has its own stack frame, which maintains all the necessary information. Register EBP points to the point of the current stack frame (high address), register ESP points to the top of the current stack frame (low address). Heterogeneous data structure The struct declaration of the C language creates a data type that aggregates objects that may be different types into an object. All components of the Structure are stored in a

after the completion of Y86 in the pipe folder input./PSIM-T-G. /y86-code/asum.yoEnter Y86-code, Generate Asuml.yoI try to knock the code out of the book, and then enter the following commandmake cleanmake 251pp.yoYou can then view the　　Code Managed Links: http://git.oschina.net/Zziyang/CS04Learning progress Bar lines of code (new /Cumulative) Blog volume ( new/cumulative) Learning time (new/cumulative) Important growth Goal 5000 row

work correctly for any viable trajectory. 2. Elimination Method:Dynamically assigns a separate block to each integer ID, and passes to the thread routine a pointer to the blockFive, Deadlock:A set of threads is blocked, waiting for a condition that will never be true.How to resolve a deadlockA. Do not allow deadlocks to occur:B. Let the deadlock occur:Resources:1. Teaching Materials: 11th chapter "Network Programming"2. Teaching Materials: 12th chapter "Concurrent Programming"20135223 He Weizin

I. INTRODUCTION of LinuxWhat is 1.Linux:Our Linux is the system call and the two layers of the kernel, of course, the intuitive view, we use the operating system also contains some of the applications running on it, such as text editor, browser, e-mail.The difference between 2.Linux and Windows:(1) Linux free or small fee, windows expensive(2) Software and support(3) Security(4) Usage habits(5) Customizable

where the contents of the disk sector should be stored. The logical block number translates a sector address and then transfers the content to main memory without CPU interference, a process known as direct memory access. This data transfer is called DMA transfer. When the volume of a disk sector is securely stored in main memory, the disk controller notifies the CPU by sending an interrupt signal to the CPU. Problem:may be a bit low-level, the book says that the main me

occurrence of competition:The correctness of a program relies on the x point of one thread to reach its control flow before another thread reaches the y point. That is, the programmer assumes that the thread will follow a particular trajectory through the execution state space, forgetting a guideline that the threaded program must work correctly for any viable trajectory. 2. Elimination Method:Dynamically assigns a separate block to each integer ID, and passes to the thread routine a pointer to

FeelingsJust beginning to touch Java, feel both confused and hard, because they have not been in a self-learning way to contact a new programming course, long time to find more difficult. I think, teacher and student relationship is eldest brother and brother! Why do you say that, because the teacher experienced the student age and more understanding of the situation of students, leading students to learn and impart some experience, so that students less detours, and exchange ideas with students