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<!-- Copyright (C) 2003 Red Hat, Inc.                                -->
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<HTML
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><TITLE
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>Task-Dependent Synchronization Functions</TITLE
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TITLE="eCos Reference Manual"
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REL="UP"
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TITLE="µITRON API"
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HREF="compat-uitron-microitron-api.html"><LINK
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REL="PREVIOUS"
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TITLE="Task Management Functions"
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HREF="compat-uitron-task-management-functions.html"><LINK
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TITLE="   Synchronization and Communication Functions"
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>eCos Reference Manual</TH
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><TD
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ALIGN="left"
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><A
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HREF="compat-uitron-task-management-functions.html"
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ACCESSKEY="P"
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>Prev</A
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></TD
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><TD
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WIDTH="80%"
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ALIGN="center"
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VALIGN="bottom"
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>Chapter 32. &micro;ITRON API</TD
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><TD
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WIDTH="10%"
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ALIGN="right"
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VALIGN="bottom"
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HREF="compat-uitron-sync-and-comm-functions.html"
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>Next</A
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><DIV
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CLASS="SECT1"
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><H1
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CLASS="SECT1"
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><A
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NAME="COMPAT-UITRON-TASK-DEPENDENT-SYNCH-FUNCTIONS">Task-Dependent Synchronization Functions</H1
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><P
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>These functions are fully supported in this release: </P
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><TABLE
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WIDTH="70%"
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><TR
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><TD
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><PRE
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CLASS="PROGRAMLISTING"
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>ER <TT
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CLASS="FUNCTION"
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>sus_tsk</TT
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>(
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    ID <SPAN
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CLASS="emphasis"
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><I
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CLASS="EMPHASIS"
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>tskid</I
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></SPAN
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> )</PRE
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></TD
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></TR
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></TABLE
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><TABLE
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WIDTH="70%"
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><TR
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><TD
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><PRE
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CLASS="PROGRAMLISTING"
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>ER <TT
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CLASS="FUNCTION"
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>rsm_tsk</TT
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>(
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    ID <SPAN
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CLASS="emphasis"
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><I
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CLASS="EMPHASIS"
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>tskid</I
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></SPAN
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> )</PRE
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></TD
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></TR
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></TABLE
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><TABLE
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BORDER="5"
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BGCOLOR="#E0E0F0"
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WIDTH="70%"
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><TR
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><TD
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><PRE
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CLASS="PROGRAMLISTING"
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>ER <TT
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CLASS="FUNCTION"
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>frsm_tsk</TT
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>(
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    ID <SPAN
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CLASS="emphasis"
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><I
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CLASS="EMPHASIS"
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>tskid</I
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></SPAN
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> )</PRE
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></TD
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></TR
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></TABLE
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><TABLE
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BORDER="5"
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BGCOLOR="#E0E0F0"
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WIDTH="70%"
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><TR
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><TD
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><PRE
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CLASS="PROGRAMLISTING"
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>ER <TT
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CLASS="FUNCTION"
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>slp_tsk</TT
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>( void )</PRE
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></TD
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></TR
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></TABLE
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><TABLE
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WIDTH="70%"
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><TR
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><TD
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><PRE
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CLASS="PROGRAMLISTING"
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>ER <TT
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CLASS="FUNCTION"
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>tslp_tsk</TT
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>(
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    TMO <SPAN
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CLASS="emphasis"
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><I
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CLASS="EMPHASIS"
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>tmout</I
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> )</PRE
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><TABLE
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><TR
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><TD
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><PRE
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CLASS="PROGRAMLISTING"
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>ER <TT
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CLASS="FUNCTION"
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>wup_tsk</TT
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>(
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    ID <SPAN
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CLASS="emphasis"
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><I
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CLASS="EMPHASIS"
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>tskid</I
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></SPAN
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> )</PRE
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></TD
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></TR
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></TABLE
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><TABLE
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BORDER="5"
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BGCOLOR="#E0E0F0"
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WIDTH="70%"
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><TR
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><TD
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><PRE
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CLASS="PROGRAMLISTING"
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>ER <TT
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CLASS="FUNCTION"
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>can_wup</TT
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>(
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    INT *<SPAN
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CLASS="emphasis"
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><I
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CLASS="EMPHASIS"
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>p_wupcnt,</I
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></SPAN
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>    ID <SPAN
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CLASS="emphasis"
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><I
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CLASS="EMPHASIS"
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>tskid</I
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></SPAN
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> )</PRE
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></TABLE
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><DIV
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CLASS="SECT2"
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><H2
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><A
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NAME="AEN13571">Error checking</H2
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><P
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>The following conditions are only checked for, and only return
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errors if
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<TT
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CLASS="LITERAL"
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>CYGSEM_UITRON_BAD_PARAMS_RETURN_ERRORS</TT
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>
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is enabled (see the configuration option &#8220;Return Error Codes for Bad
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Params&#8221;):</P
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><P
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></P
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><UL
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><LI
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><P
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>invalid tskid; less than 1 or greater than
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<TT
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CLASS="LITERAL"
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>CYGNUM_UITRON_TASKS</TT
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>
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returns E_ID</P
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></LI
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><LI
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><P
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><TT
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CLASS="FUNCTION"
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>wup_tsk()</TT
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>
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,
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<TT
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CLASS="FUNCTION"
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>sus_tsk()</TT
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>
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,
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<TT
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CLASS="FUNCTION"
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>rsm_tsk()</TT
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>
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,
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<TT
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CLASS="FUNCTION"
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>frsm_tsk()</TT
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>
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 on the calling task returns E_OBJ</P
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></LI
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><LI
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><P
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>dispatching is enabled in
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<TT
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CLASS="FUNCTION"
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>tslp_tsk()</TT
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>
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 and
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<TT
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CLASS="FUNCTION"
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>slp_tsk()</TT
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>
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, or E_CTX</P
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></LI
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><LI
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><P
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>tmout must be positive, otherwise E_PAR</P
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></LI
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><LI
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><P
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>return value pointer in
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<TT
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CLASS="FUNCTION"
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>can_wup()</TT
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>
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 is a valid pointer, or E_PAR</P
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></LI
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></UL
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><P
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>The following conditions are checked for, and can
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            return error codes, regardless of the setting of
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<TT
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CLASS="LITERAL"
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>CYGSEM_UITRON_BAD_PARAMS_RETURN_ERRORS</TT
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>:</P
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><P
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></P
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><UL
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><LI
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><P
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>When create and delete functions
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<TT
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CLASS="FUNCTION"
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>cre_tsk()</TT
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>
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 and
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<TT
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CLASS="FUNCTION"
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>del_tsk()</TT
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>
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 are supported, all calls which use a valid task ID number check
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that the task exists; if not, E_NOEXS is returned</P
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></LI
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><LI
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><P
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><TT
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CLASS="FUNCTION"
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>sus_tsk()</TT
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>
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: the task must not be dormant, else E_OBJ</P
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></LI
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><LI
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><P
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><TT
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CLASS="FUNCTION"
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>frsm/rsm_tsk()</TT
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>
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: the task must be suspended, else E_OBJ</P
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></LI
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><LI
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><P
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><TT
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CLASS="FUNCTION"
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>tslp/slp_tsk()</TT
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>
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: return codes E_TMOUT, E_RLWAI and E_DLT
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are returned depending on the reason for terminating the sleep</P
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></LI
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><LI
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><P
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><TT
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CLASS="FUNCTION"
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>wup_tsk()</TT
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>
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 and
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<TT
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CLASS="FUNCTION"
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>can_wup()</TT
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>
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: the task must not be dormant, or E_OBJ is returned</P
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></LI
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VALIGN="top"
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><A
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HREF="compat-uitron-task-management-functions.html"
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>Prev</A
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HREF="ecos-ref.html"
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>Home</A
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>Task Management Functions</TD
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HREF="compat-uitron-microitron-api.html"
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>Up</A
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>Synchronization and Communication Functions</TD
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