Notice: We have migrated to GitLab launching 2024-05-01 see here: https://gitlab.rtems.org/

Changes between Version 35 and Version 36 of Developer/SMP


Ignore:
Timestamp:
02/18/14 17:13:52 (10 years ago)
Author:
Sh
Comment:

/* SMP Locks */ ​http://git.rtems.org/rtems/commit/?id=0344ce0385fb2ff4f55d4154ae38b438c2168340

Legend:

Unmodified
Added
Removed
Modified

  • Developer/SMP

    v35 v36  
    221221
    222222
    223 The implementation is now CPU architecture specific.
     223SMP locks are implemented as a ticket lock using CPU architecture specific atomic operations.
    224224==  Future Directions  ==
    225225
    226226
    227  *  Use a fair lock on SPARC and x86, e.g. a ticket lock like on ARM and PowerPC.
    228227 *  Use a local context to be able to use scalable lock implementations like the Mellor-Crummey and Scotty (MCS) queue-based locks.
    229228 *  Introduce read-write locks.  Use phase-fair read-write lock implementation.  This can be used for example by the time management code.  The system time may be read frequently, but updates are infrequent.
    … …  
    15771576orthogonal to the blocking states, e.g. DORMANT, SUSPENDED etc.:
    15781577
    1579 ; PROTECTED : The thread is protected from immediate restart, delete and suspend actions. 
     1578; PROTECTED : The thread is protected from immediate restart, delete and suspend actions.  Can be controlled by pthread_setcancelsta