+++ /dev/null
-<!-- Copyright (C) 2003 Red Hat, Inc. -->
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-<HTML
-><HEAD
-><TITLE
->Task Management Functions</TITLE
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-REL="UP"
-TITLE="µITRON API"
-HREF="compat-uitron-microitron-api.html"><LINK
-REL="PREVIOUS"
-TITLE="µITRON and eCos"
-HREF="compat-uitron-over-ecos.html"><LINK
-REL="NEXT"
-TITLE="Task-Dependent Synchronization Functions"
-HREF="compat-uitron-task-dependent-synch-functions.html"></HEAD
-><BODY
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->Chapter 32. µITRON API</TD
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-><DIV
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-><H1
-CLASS="SECT1"
-><A
-NAME="COMPAT-UITRON-TASK-MANAGEMENT-FUNCTIONS">Task Management Functions</H1
-><P
->The following functions are fully supported in this release: </P
-><TABLE
-BORDER="5"
-BGCOLOR="#E0E0F0"
-WIDTH="70%"
-><TR
-><TD
-><PRE
-CLASS="PROGRAMLISTING"
->ER <TT
-CLASS="FUNCTION"
->sta_tsk</TT
->(
- ID <SPAN
-CLASS="emphasis"
-><I
-CLASS="EMPHASIS"
->tskid,</I
-></SPAN
->
- INT <SPAN
-CLASS="emphasis"
-><I
-CLASS="EMPHASIS"
->stacd</I
-></SPAN
-> )</PRE
-></TD
-></TR
-></TABLE
-><TABLE
-BORDER="5"
-BGCOLOR="#E0E0F0"
-WIDTH="70%"
-><TR
-><TD
-><PRE
-CLASS="PROGRAMLISTING"
->void <TT
-CLASS="FUNCTION"
->ext_tsk</TT
->( void )</PRE
-></TD
-></TR
-></TABLE
-><TABLE
-BORDER="5"
-BGCOLOR="#E0E0F0"
-WIDTH="70%"
-><TR
-><TD
-><PRE
-CLASS="PROGRAMLISTING"
->void <TT
-CLASS="FUNCTION"
->exd_tsk</TT
->( void )</PRE
-></TD
-></TR
-></TABLE
-><TABLE
-BORDER="5"
-BGCOLOR="#E0E0F0"
-WIDTH="70%"
-><TR
-><TD
-><PRE
-CLASS="PROGRAMLISTING"
->ER <TT
-CLASS="FUNCTION"
->dis_dsp</TT
->( void )</PRE
-></TD
-></TR
-></TABLE
-><TABLE
-BORDER="5"
-BGCOLOR="#E0E0F0"
-WIDTH="70%"
-><TR
-><TD
-><PRE
-CLASS="PROGRAMLISTING"
->ER <TT
-CLASS="FUNCTION"
->ena_dsp</TT
->( void )</PRE
-></TD
-></TR
-></TABLE
-><TABLE
-BORDER="5"
-BGCOLOR="#E0E0F0"
-WIDTH="70%"
-><TR
-><TD
-><PRE
-CLASS="PROGRAMLISTING"
->ER <TT
-CLASS="FUNCTION"
->chg_pri</TT
->(
- ID <SPAN
-CLASS="emphasis"
-><I
-CLASS="EMPHASIS"
->tskid,</I
-></SPAN
->
- PRI <SPAN
-CLASS="emphasis"
-><I
-CLASS="EMPHASIS"
->tskpri</I
-></SPAN
-> )</PRE
-></TD
-></TR
-></TABLE
-><TABLE
-BORDER="5"
-BGCOLOR="#E0E0F0"
-WIDTH="70%"
-><TR
-><TD
-><PRE
-CLASS="PROGRAMLISTING"
->ER <TT
-CLASS="FUNCTION"
->rot_rdq</TT
->(
- PRI <SPAN
-CLASS="emphasis"
-><I
-CLASS="EMPHASIS"
->tskpri</I
-></SPAN
-> )</PRE
-></TD
-></TR
-></TABLE
-><TABLE
-BORDER="5"
-BGCOLOR="#E0E0F0"
-WIDTH="70%"
-><TR
-><TD
-><PRE
-CLASS="PROGRAMLISTING"
->ER <TT
-CLASS="FUNCTION"
->get_tid</TT
->(
- ID *<SPAN
-CLASS="emphasis"
-><I
-CLASS="EMPHASIS"
->p_tskid</I
-></SPAN
-> )</PRE
-></TD
-></TR
-></TABLE
-><TABLE
-BORDER="5"
-BGCOLOR="#E0E0F0"
-WIDTH="70%"
-><TR
-><TD
-><PRE
-CLASS="PROGRAMLISTING"
->ER <TT
-CLASS="FUNCTION"
->ref_tsk</TT
->(
- T_RTSK *<SPAN
-CLASS="emphasis"
-><I
-CLASS="EMPHASIS"
->pk_rtsk,</I
-></SPAN
->
- ID <SPAN
-CLASS="emphasis"
-><I
-CLASS="EMPHASIS"
->tskid</I
-></SPAN
-> )</PRE
-></TD
-></TR
-></TABLE
-><TABLE
-BORDER="5"
-BGCOLOR="#E0E0F0"
-WIDTH="70%"
-><TR
-><TD
-><PRE
-CLASS="PROGRAMLISTING"
->ER <TT
-CLASS="FUNCTION"
->ter_tsk</TT
->(
- ID <SPAN
-CLASS="emphasis"
-><I
-CLASS="EMPHASIS"
->tskid</I
-></SPAN
-> )</PRE
-></TD
-></TR
-></TABLE
-><TABLE
-BORDER="5"
-BGCOLOR="#E0E0F0"
-WIDTH="70%"
-><TR
-><TD
-><PRE
-CLASS="PROGRAMLISTING"
->ER <TT
-CLASS="FUNCTION"
->rel_wai</TT
->(
- ID <SPAN
-CLASS="emphasis"
-><I
-CLASS="EMPHASIS"
->tskid</I
-></SPAN
-> )</PRE
-></TD
-></TR
-></TABLE
-><P
->The following two functions are supported in this release,
-when enabled with the configuration option
-<TT
-CLASS="LITERAL"
->CYGPKG_UITRON_TASKS_CREATE_DELETE</TT
->
-with some restrictions:</P
-><TABLE
-BORDER="5"
-BGCOLOR="#E0E0F0"
-WIDTH="70%"
-><TR
-><TD
-><PRE
-CLASS="PROGRAMLISTING"
->ER <TT
-CLASS="FUNCTION"
->cre_tsk</TT
->(
- ID <SPAN
-CLASS="emphasis"
-><I
-CLASS="EMPHASIS"
->tskid,</I
-></SPAN
->
- T_CTSK *<SPAN
-CLASS="emphasis"
-><I
-CLASS="EMPHASIS"
->pk_ctsk</I
-></SPAN
-> )</PRE
-></TD
-></TR
-></TABLE
-><TABLE
-BORDER="5"
-BGCOLOR="#E0E0F0"
-WIDTH="70%"
-><TR
-><TD
-><PRE
-CLASS="PROGRAMLISTING"
->ER <TT
-CLASS="FUNCTION"
->del_tsk</TT
->(
- ID <SPAN
-CLASS="emphasis"
-><I
-CLASS="EMPHASIS"
->tskid</I
-></SPAN
-> )</PRE
-></TD
-></TR
-></TABLE
-><P
->These functions are restricted as follows:</P
-><P
->Because of the static initialization facilities provided for
-system objects, a task is allocated stack space statically in the
-configuration. So while tasks can be created and deleted, the same
-stack space is used for that task (task ID number) each time. Thus
-the stack size (pk_ctsk->stksz) requested in <TT
-CLASS="FUNCTION"
->cre_tsk()</TT
-> is
-checked for being less than that which was statically allocated,
-and otherwise ignored. This ensures that the new task will have
-enough stack to run. For this reason <TT
-CLASS="FUNCTION"
->del_tsk()</TT
-> does
-not in any sense free the memory that was in use for the task's
-stack. </P
-><P
->The task attributes (pk_ctsk->tskatr) are
-ignored; current versions of <SPAN
-CLASS="emphasis"
-><I
-CLASS="EMPHASIS"
->eCos</I
-></SPAN
-> do not need
-to know whether a task is written in assembler or C/C++ so
-long as the procedure call standard appropriate to the CPU is followed.</P
-><P
->Extended information (pk_ctsk->exinf) is
- ignored.</P
-><DIV
-CLASS="SECT2"
-><H2
-CLASS="SECT2"
-><A
-NAME="AEN13490">Error checking</H2
-><P
->For all these calls, an invalid task id (tskid) (less than
-1 or greater than the number of configured tasks) only returns E_ID
-when bad params return errors (
-<TT
-CLASS="LITERAL"
->CYGSEM_UITRON_BAD_PARAMS_RETURN_ERRORS</TT
->
-is enabled, see above).</P
-><P
->Similarly, the following conditions are only checked for,
-and only return errors if
-<TT
-CLASS="LITERAL"
->CYGSEM_UITRON_BAD_PARAMS_RETURN_ERRORS</TT
->
-is enabled:</P
-><P
-></P
-><UL
-><LI
-><P
->pk_crtk in
-<TT
-CLASS="FUNCTION"
->cre_tsk()</TT
->
- is a valid pointer, otherwise return E_PAR</P
-></LI
-><LI
-><P
-><TT
-CLASS="FUNCTION"
->ter_tsk()</TT
->
- or
-<TT
-CLASS="FUNCTION"
->rel_wai()</TT
->
- on the calling task returns E_OBJ</P
-></LI
-><LI
-><P
->the CPU is not locked already in
-<TT
-CLASS="FUNCTION"
->dis_dsp()</TT
->
- and
-<TT
-CLASS="FUNCTION"
->ena_dsp()</TT
->
-; returns E_CTX</P
-></LI
-><LI
-><P
->priority level in
-<TT
-CLASS="FUNCTION"
->chg_pri()</TT
->
- and
-<TT
-CLASS="FUNCTION"
->rot_rdq()</TT
->
- is checked for validity, E_PAR</P
-></LI
-><LI
-><P
->return value pointer in
-<TT
-CLASS="FUNCTION"
->get_tid()</TT
->
- and
-<TT
-CLASS="FUNCTION"
->ref_tsk()</TT
->
- is a valid pointer, or E_PAR</P
-></LI
-></UL
-><P
->The following conditions are checked for, and return
- error codes if appropriate, regardless of the setting of
-<TT
-CLASS="LITERAL"
->CYGSEM_UITRON_BAD_PARAMS_RETURN_ERRORS</TT
->
-:</P
-><P
-></P
-><UL
-><LI
-><P
->When create and delete functions
-<TT
-CLASS="FUNCTION"
->cre_tsk()</TT
->
- and
-<TT
-CLASS="FUNCTION"
->del_tsk()</TT
->
- are supported, all calls which use a valid task ID number check
-that the task exists; if not, E_NOEXS is returned</P
-></LI
-><LI
-><P
->When supported,
-<TT
-CLASS="FUNCTION"
->cre_tsk()</TT
->
-: the task must not already exist; otherwise E_OBJ</P
-></LI
-><LI
-><P
->When supported,
-<TT
-CLASS="FUNCTION"
->cre_tsk()</TT
->
-: the requested stack size must not be larger than that statically
-configured for the task; see the configuration options
-“Static initializers”, and “Default stack size”.
-Else E_NOMEM</P
-></LI
-><LI
-><P
->When supported,
-<TT
-CLASS="FUNCTION"
->del_tsk()</TT
->
-: the underlying
-<SPAN
-CLASS="emphasis"
-><I
-CLASS="EMPHASIS"
->eCos</I
-></SPAN
->
- thread must not be running - this would imply either a bug or some
-program bypassing the
-µITRON compatibility layer and manipulating the thread directly.
-E_OBJ</P
-></LI
-><LI
-><P
-><TT
-CLASS="FUNCTION"
->sta_tsk()</TT
->
-: the task must be dormant, else E_OBJ</P
-></LI
-><LI
-><P
-><TT
-CLASS="FUNCTION"
->ter_tsk()</TT
->
-: the task must not be dormant, else E_OBJ</P
-></LI
-><LI
-><P
-><TT
-CLASS="FUNCTION"
->chg_pri()</TT
->
-: the task must not be dormant, else E_OBJ</P
-></LI
-><LI
-><P
-><TT
-CLASS="FUNCTION"
->rel_wai()</TT
->
-: the task must be in
-<TT
-CLASS="VARNAME"
->WAIT</TT
-> or <TT
-CLASS="VARNAME"
->WAIT-SUSPEND</TT
->
- state, else E_OBJ</P
-></LI
-></UL
-></DIV
-></DIV
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-CLASS="NAVFOOTER"
-><HR
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