July 2017
Intermediate to advanced
244 pages
6h 33m
English
Content preview from Mastering C++ Multithreading
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Software
Software-defined mutual exclusion implementations are all based on busy-waiting. An example is Dekker's algorithm, which defines a system in which two processes can synchronize, employing busy-wait to wait for the other process to leave the critical section.
The pseudocode for this algorithm is as follows:
variables wants_to_enter : array of 2 booleans turn : integer wants_to_enter[0] ← false wants_to_enter[1] ← false turn ← 0 // or 1
p0: wants_to_enter[0] ← true while wants_to_enter[1] { if turn ≠ 0 { wants_to_enter[0] ← false while turn ≠ 0 { // busy wait } wants_to_enter[0] ← true } } // critical section ... turn ← 1 wants_to_enter[0] ← false // remainder section
p1: wants_to_enter[1] ← true while wants_to_enter[0] { if turn ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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