January 2004
Intermediate to advanced
432 pages
11h 1m
English
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Signal Recognition
There are three places a thread checks to see if it has been signaled: at the end of every system call, when it wakes up from a sleep, and after handling a trap of some kind. The routine that checks for signals is issig(). The kernel routines real_sleep(), syscall(), and trap() each call issig() to see if any signals are pending for the thread.
The job of issig() is to determine what signal, if any, should be processed. issig() loops through the bits in p_sig and kt_sig looking for pending signals. If it finds no signals pending, it returns zero. If it finds a signal that is pending, it returns the number of the signal. The signal number is also placed in the thread structure, in kt_cursig.
Although this sounds like a relatively ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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