October 2017
Intermediate to advanced
354 pages
9h 28m
English
Content preview from Mastering Linux Kernel Development
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Signal descriptors
Recall from our earlier discussions in the first chapter that Linux supports multi-threaded applications through lightweight processes. All LWPs of a threaded application are part of a process group and share signal handlers; each LWP (thread) maintains its own pending, and blocked signal queues.
The signal pointer of the task structure refers to the instance of type signal_struct, which is the signal descriptor. This structure is shared by all LWPs of a thread group and maintains elements such as a shared pending signal queue (for signals queued to a thread group), which is common to all threads in a process group.
The following figure represents the data structures involved in maintaining shared pending signals:
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