OpenVMS AXPSYS07_061 Alpha V6.1 System ECO Summary

 
Copyright (c) Digital Equipment Corporation 1995.  All rights reserved.

PRODUCT:    OpenVMS Alpha

COMPONENT:  System (SYSTEM_SYNCHRONIZATION_MIN)

SOURCE:     Digital Equipment Corporation

ECO INFORMATION:

     ECO Kit Name:  AXPSYS07_061
     ECO Kits Superseded by This ECO Kit:  None
     ECO Kit Approximate Size:  270 Blocks
     Kit Applies To:  OpenVMS Alpha  V6.1, V6.1-1H1, V6.1-1H2
     System Reboot Necessary:  Yes


ECO KIT SUMMARY:

An ECO kit exists for SYSTEM_SYNCHRONIZATION_MIN.EXE on OpenVMS Alpha
V6.1, V6.1-1H1, and V6.1-1H2.  This kit addresses the following
problem: 

  o  Drivers written in C are unable to release acquired spinlocks
     with the supplied interface macros.  The routine call actually
     happens, but because no code routine was linked when the execlet
     was loaded, the only action that occurs is the return of an error
     status.  This leaves the previously locked devicelock in
     acquisition state with no hope of release. 

     The following code example exhibits the problem:

          #DEFINE device_unlock(lockaddr, newipl, restore)
                   {
                    EXTERN SMP smp$gl_flags;
                     IF(smp$gl_flags.smp$v_enabled) 
                    IF(restore == SMP_RELEASE)
                       smp_std$releasel( lockaddr );
                     ELSE
                      smp_std$restorel( lockaddr );
                     }

     When this macro is used on a multiple CPU system with the system 
     parameter "MULTIPROCESSING" set to "3" the code will go into
     smp_std$restorel and do a: 

          LDx
          LDx
          RET


INSTALLATION NOTES:

In order for the corrections in this kit to take effect, the system
must be rebooted.  If the system is a member of a VMScluster, the
entire cluster should be rebooted. 

Colorado Site
Georgia Site

axpsys07_061_system.README
axpsys07_061.CHKSUM
axpsys07_061.a-dcx_axpexe