How to Set the Maximum Number of LWPs for Each Task in a Project

This procedure adds a project named x-files to the /etc/project file and sets a maximum number of LWPs for a task created in the project.

1. Become superuser or assume an equivalent role.

2. Use the projadd command with the -K option to create a project called x-files. Set the maximum number of LWPs for each task created in the project to 3.

   # projadd -K 'task.max-lwps=(privileged,3,deny)' x-files

3. View the entry in the /etc/project file by using one of the following methods:

   • Type:

     # projects -l system projid : 0 comment: "" users : (none) groups : (none) attribs: . . . x-files projid : 100 comment: "" users : (none) groups : (none) attribs: task.max-lwps=(privileged,3,deny)

   • Type:

     # cat /etc/project system:0:System::: . . . x-files:100::::task.max-lwps=(privileged,3,deny)

Example 7–1 Sample Session

After implementing the steps in this procedure, when superuser creates a new task in project x-files by joining the project with newtask, superuser will not be able to create more than three LWPs while running in this task. This is shown in the following annotated sample session.

# newtask -p x-files csh

# prctl -n task.max-lwps $$
process: 111107: csh
NAME    PRIVILEGE    VALUE    FLAG   ACTION            RECIPIENT
task.max-lwps
        privileged       3       -   deny                      -
        system       2.15G     max   deny                      -
# id -p
uid=0(root) gid=1(other) projid=100(x-files)

# ps -o project,taskid -p $$
 PROJECT TASKID
 x-files    73

# csh        /* creates second LWP */

# csh        /* creates third LWP */

# csh        /* cannot create more LWPs */
Vfork failed
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