Subversion Repositories HelenOS-doc

Rev

Rev 138 | Show entire file | Ignore whitespace | Details | Blame | Last modification | View Log | RSS feed

Rev 138 Rev 171
Line 55... Line 55...
55 
    </indexterm>
 55 
    </indexterm>
56 
 
 56 
 
57 
    <para>Kernel's unit of execution flow is a thread. A thread is an entity
 57 
    <para>Kernel's unit of execution flow is a thread. A thread is an entity
58 
    that executes code and has a stack that takes up some space in memory. The
 58 
    that executes code and has a stack that takes up some space in memory. The
59 
    relation between kernel and userspace threads is 1:1:n, meaning that there
 59 
    relation between kernel and userspace threads is 1:1:n, meaning that there
60 
    can be several pseudo threads running within one userspace thread that
 60 
    can be several so called fibrils running within one userspace thread that
61 
    maps to one kernel thread. Threads are grouped into tasks by functionality
 61 
    maps to one kernel thread. Threads are grouped into tasks by functionality
62 
    they provide (i.e. several threads implement functionality of one task).
 62 
    they provide (i.e. several threads implement functionality of one task).
63 
    <indexterm>
 63 
    <indexterm>
64 
        <primary>task</primary>
 64 
        <primary>task</primary>
65 
      </indexterm> Tasks serve as containers of threads, they provide linkage
 65 
      </indexterm> Tasks serve as containers of threads, they provide linkage