How to Use prctl to Temporarily Change a Value

This example procedure uses the prctl command to temporarily add a new privileged value to deny the use of more than three LWPs per project for the x-files project. The result is comparable to the result in How to Set the Maximum Number of LWPs for Each Task in a Project.

1. Become root or assume an equivalent role.
2. Use newtask to join the x-files project.

   # newtask -p x-files

3. Use the id command with the –p option to verify that the correct project has been joined.

   # id -p
   uid=0(root) gid=1(other) projid=101(x-files)

4. Add a new privileged value for project.max-lwps that limits the number of LWPs to three.

   # prctl -n project.max-lwps -t privileged -v 3 -e deny -i project x-files

5. Verify the result.

   # prctl -n project.max-lwps -i project x-files
   process: 111108: csh
   NAME    PRIVILEGE    VALUE    FLAG   ACTION            RECIPIENT
   project.max-lwps
           usage          203
           privileged    1000       -   deny                      -
           system       2.15G     max   deny                      -