Services vs Directives vs System Calls

ricardo ricardo-e-silva at criticalsoftware.com
Fri Apr 18 09:33:01 UTC 2008


Hi,


In the RTEMS POSIX API User's Guide for RTEMS 4.6.6 the API functions
are separated in three groups (services, directives or system calls).
Some managers have services (like mutex manager), others have directives
(like semaphore manager) and only one has system calls (timer manager)


In RTEMS C User’s Guide (for classical api), we only find directives
under each manager. 

Anyone can explain me what is the difference between this three types of
API functions? 


Thanks,

Ricardo




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