October 2018
Beginner
794 pages
19h 23m
English
Content preview from Hands-On System Programming with Linux
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Self deadlock (relock)
Knowing the aforementioned information, visualize this scenario: there is one lock (we just call it L1) and three threads in competition for it (let's just call them threads A, B, and C); let's say thread B is the winner. That's fine, but what happens if thread B, within its critical section, again attempts to take the same lock, L1? Well, think about it: lock L1 is currently in the locked state, thus forcing thread B to block (wait) upon it getting unlocked. However, no thread but thread B itself can possibly perform the unlock operation, so thread B will end up waiting forever! There we have it: deadlock. This type of deadlock is termed the self deadlock, or the relock error.
One might argue, and indeed the case does ...
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