A signal is said to be generated when its occurrence is enqueued, to list of pending signals in the task structure of the receiver process or processes. The signal is generated (on a process or a group) upon request from a user-mode process, kernel, or any of the kernel services. A signal is considered to be delivered when the receiver process or processes are made aware of its occurrence and are forced to execute the appropriate response handler; in other words, signal delivery is equal to initialization of the corresponding handler. Ideally, every signal generated is assumed to be instantly delivered; however, there is a possibility of delay between signal generation, and it eventual delivery. To facilitate possible deferred delivery, the kernel provides separate functions for signal generation and delivery.
Mastering Linux Kernel Development
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Mastering Linux Kernel Development
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Overview of this book
Mastering Linux Kernel Development looks at the Linux kernel, its internal arrangement and design, and various core subsystems, helping you to gain significant understanding of this open source marvel. You will look at how the Linux kernel, which possesses a kind of collective intelligence thanks to its scores of contributors, remains so elegant owing to its great design.
This book also looks at all the key kernel code, core data structures, functions, and macros, giving you a comprehensive foundation of the implementation details of the kernel’s core services and mechanisms. You will also look at the Linux kernel as well-designed software, which gives us insights into software design in general that are easily scalable yet fundamentally strong and safe.
By the end of this book, you will have considerable understanding of and appreciation for the Linux kernel.
Table of Contents (12 chapters)
Preface
Free Chapter
Comprehending Processes, Address Space, and Threads
Deciphering the Process Scheduler
Signal Management
Memory Management and Allocators
Filesystems and File I/O
Interprocess Communication
Virtual Memory Management
Kernel Synchronization and Locking
Interrupts and Deferred Work
Clock and Time Management
Module Management
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