Solved

vector and threads

Posted on 2015-02-18
4
121 Views
Last Modified: 2015-02-18
Hi Experts,

I want to have a bunch of threads that share a vector.  If I keep a critical section around the vector at all places where it is accessed, am I ok?

i.e., I place a critical section around the size() call where the parent class that owns the vector is a GetSize

I place a critical section around code that adds items to the vector in the AddItem function

Is there anything else to watch out for?

Thanks,
Mike
0
Comment
Question by:thready
  • 3
4 Comments
 
LVL 1

Author Comment

by:thready
ID: 40617226
Also, my concern is here:


int TaskRunner::GetNumberOfTasksInQueue()
{
      EnterCriticalSection(&m_QueueCriticalSection);

      int nSize = m_TaskQueue.size();

      LeaveCriticalSection(&m_QueueCriticalSection);

     // RIGHT HERE - SIZE MIGHT BE INCORRECT - ANOTHER THREAD MAY HAVE COME IN AND CHANGED SIZE
//  JUST BEFORE I GOT TO RETURN IT.  HOW DO I FIX THIS?

      return nSize;
}
0
 
LVL 1

Author Comment

by:thready
ID: 40617232
ignore that last concern - I realized that size is a stack variable - not a member variable like I was thinking....
0
 
LVL 86

Accepted Solution

by:
jkr earned 500 total points
ID: 40617318
>> If I keep a critical section around the vector at all places where it is accessed, am I ok?

Short ad sweet: if 'accessed' means both read and write access, you are absolutely fine.
0
 
LVL 1

Author Closing Comment

by:thready
ID: 40617388
Gracias amigo
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

A theme is a collection of property settings that allow you to define the look of pages and controls, and then apply the look consistently across pages in an application. Themes can be made up of a set of elements: skins, style sheets, images, and o…
Container Orchestration platforms empower organizations to scale their apps at an exceptional rate. This is the reason numerous innovation-driven companies are moving apps to an appropriated datacenter wide platform that empowers them to scale at a …
The goal of the video will be to teach the user the difference and consequence of passing data by value vs passing data by reference in C++. An example of passing data by value as well as an example of passing data by reference will be be given. Bot…
The viewer will learn how to user default arguments when defining functions. This method of defining functions will be contrasted with the non-default-argument of defining functions.

895 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

15 Experts available now in Live!

Get 1:1 Help Now