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Task #17844

Milestone #17719: Booster operational test of one crate alongside existing BPM system

Locking mechanism for shared memory objects

Added by John Diamond almost 3 years ago. Updated almost 3 years ago.

Status:
Resolved
Priority:
Normal
Assignee:
John Diamond
Start date:
10/09/2017
Due date:
% Done:

100%

Estimated time:
12.00 h
Spent time:
3.00 h
Duration:

Description

Implement a locking mechanism for records stored in a SharedMemoryTable.

History

#1 Updated by John Diamond almost 3 years ago

We can base this design on process-shared POSIX semaphores:

https://linux.die.net/man/7/sem_overview

#2 Updated by John Diamond almost 3 years ago

  • Status changed from Assigned to Resolved
  • % Done changed from 0 to 100

Created a template class called SHMClient<> that will lock the mutex inside the Record structure of the template parameter. The template parameter must provide a method called mutexGet() to provide access to the mutex.

Added locks to the ACNET code, cli code and DAQSystem code that deals with the shared memory Reading tables.

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