Traduction et analyse de mots par intelligence artificielle ChatGPT
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Qu'est-ce (qui) est Set Priority Level - définition
![[[Gottlob Christian Storr]]](https://commons.wikimedia.org/wiki/Special:FilePath/H Leibnitz - Theophil (Gottlob) Christian Storr (1844).jpg?width=200 "[[Gottlob Christian Storr]]")
![The [[two-source hypothesis]], one of several built upon Marcan priority, holds that a hypothetical document (the [[Q source]]) was also used as a source by Matthew and Luke independently.](https://commons.wikimedia.org/wiki/Special:FilePath/Synoptic Theory Mk-Q en.svg?width=200 "The [[two-source hypothesis]], one of several built upon Marcan priority, holds that a hypothetical document (the [[Q source]]) was also used as a source by Matthew and Luke independently.")
![Two-Gospel (Griesbach) theory]], an alternative to Marcan priority, holds that Mark used Matthew and Luke as sources.](https://commons.wikimedia.org/wiki/Special:FilePath/Synoptic Theory Mt-Lk en.svg?width=200 "Two-Gospel (Griesbach) theory]], an alternative to Marcan priority, holds that Mark used Matthew and Luke as sources.")
Wikipédia
spl (short for set priority level, after the PDP-11 assembler instruction of the same name) is the name for a collection of Unix kernel routines or macros used to change the interrupt priority level. This was historically needed to synchronize critical sections of kernel code that should not be interrupted. Newer Unix variants which support symmetric multiprocessing now mostly use mutexes for this purpose, which is a more general solution, so multiple processors can execute kernel code at the same time.
On older PDP-11 versions of Unix, there were eight of these routines, ranging from spl0 to spl7, each corresponding to one PDP-11 interrupt priority level, in addition to splx, which restores a previous priority level (returned by one of the other routines). On BSD Unix and its derivatives, these are called splhigh, splserial, splsched, splclock, splstatclock, splvm, spltty, splsofttty, splnet, splbio, splsoftnet, splsoftclock, spllowersoftclock, spl0, and splx.
As of March 2019, the spl family of primitives is still heavily used in OpenBSD and NetBSD, which is evidenced by the plentiful of calls to splnet() within the networking code; whereas FreeBSD and DragonFly BSD use more modern concepts; for example, in DragonFly, LWKT tokens may be used in place of spl.
