?? brl_core.c
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<HTML><HEAD><TITLE>/home/asysweb/public_html/cortex/examples/exmpl5/src/brl_core.c</TITLE></HEAD><BODY><pre><font color="#6920ac">/*************************************************************************/</font><font color="#6920ac">/* */</font><font color="#6920ac">/* Copyright (c) 1997-1999 Australian Real Time Embedded Systems */</font><font color="#6920ac">/* */</font><font color="#6920ac">/* PROPRIETARY RIGHTS of Australian Real Time Embedded Systems */</font><font color="#6920ac">/* are involved in the subject matter of this material. All reproduction,*/</font><font color="#6920ac">/* manufacturing, use, and sales rights pertaining to this subject matter*/</font><font color="#6920ac">/* are governed by the license agreement. The recipient of this software */</font><font color="#6920ac">/* implicitly accepts the terms of the license. */</font><font color="#6920ac">/* */</font><font color="#6920ac">/*************************************************************************/</font><b><font color='DarkGreen'>#include</font></b> <a href="brl_defs.h.FIND-INC"><font color="blue">"brl_defs.h"</font></a><font color="#6920ac">/* create/initialise barrier lock */</font><font size="+1"><i>brrl_Barrier_t</i> *<b><font color="azure1"><a name="brrl_Create">brrl_Create</a></font></b>(<i>crtx_Int_t</i> Count_a){</font><font color="#6920ac">/********************* * LOCAL VARIABLES * *********************/</font> <i>brrl_Barrier_t</i> *pBarrier;<font color="#6920ac">/********************* * PROCEDURE LOGIC * *********************/</font> <b>if</b> (Count_a <= 0) <a href="CRTX_EXCEPTION.FIND-DEF">CRTX_EXCEPTION</a> InvalidArg_Exc; <font color="#6920ac">/* allocate semaphore descriptor block */</font> pBarrier = (<i>brrl_Barrier_t</i>*)<a href="dmem_Alloc.FIND-FUNC">dmem_Alloc</a>(<a href="DMEM_STD_SEGMENT.FIND-DEF">DMEM_STD_SEGMENT</a>, <i>sizeof</i>(<i>brrl_Barrier_t</i>), <i>sizeof</i>(<i>crtx_Uint32_t</i>)); <b>if</b> ((<i>crtx_Void_t</i>*)pBarrier == <a href="DMEM_ILLEGAL.FIND-DEF">DMEM_ILLEGAL</a>) <a href="CRTX_EXCEPTION.FIND-DEF">CRTX_EXCEPTION</a> MemAllocFailed_Exc; <b>if</b> ((pBarrier->pMutex = <a href="mutx_Create.FIND-FUNC">mutx_Create</a>(<a href="CRTX_NULL.FIND-DEF">CRTX_NULL</a>, <a href="NULL.FIND-DEF">NULL</a>)) == (<i>mutx_Mutex_t</i>*)<a href="CRTX_NULL.FIND-DEF">CRTX_NULL</a>) <a href="CRTX_EXCEPTION.FIND-DEF">CRTX_EXCEPTION</a> MutexCreateFailed_Exc; <b>if</b> ((pBarrier->pWaitingList = <a href="mutx_CondCreate.FIND-FUNC">mutx_CondCreate</a>(<a href="CRTX_NULL.FIND-DEF">CRTX_NULL</a>, pBarrier->pMutex, <a href="CRTX_NULL.FIND-DEF">CRTX_NULL</a>)) == (<i>mutx_Condition_t</i> *)<a href="CRTX_NULL.FIND-DEF">CRTX_NULL</a>) <a href="CRTX_EXCEPTION.FIND-DEF">CRTX_EXCEPTION</a> ConditionCreateFailed_Exc; pBarrier->Count = Count_a; pBarrier->Arrived = 0; <b>return</b> pBarrier;<font color="#6920ac">/************************ * EXCEPTION HANDLING * ************************/</font><font color="blue">ConditionCreateFailed_Exc:</font> <a href="mutx_Delete.FIND-FUNC">mutx_Delete</a>(pBarrier->pMutex); <font color="#6920ac">/* FALL-THROUGH */</font><font color="blue">MutexCreateFailed_Exc:</font> <a href="dmem_Free.FIND-FUNC">dmem_Free</a>(<a href="DMEM_STD_SEGMENT.FIND-DEF">DMEM_STD_SEGMENT</a>, (<i>crtx_Void_t</i>*)pBarrier, <i>sizeof</i>(<i>brrl_Barrier_t</i>)); <font color="#6920ac">/* FALL-THROUGH */</font><font color="blue">MemAllocFailed_Exc:</font><font color="blue">InvalidArg_Exc:</font> <b>return</b> <a href="CRTX_NULL.FIND-DEF">CRTX_NULL</a>;}<font color="#6920ac">/* destroy barrier lock */</font><font size="+1"><i>crtx_Void_t</i> <b><font color="azure1"><a name="brrl_Delete">brrl_Delete</a></font></b>(<i>brrl_Barrier_t</i> *pBarrier_a){</font><font color="#6920ac">/********************* * LOCAL VARIABLES * *********************/</font> <font color="#6920ac">/* None */</font><font color="#6920ac">/********************* * PROCEDURE LOGIC * *********************/</font> <a href="mutx_CondDelete.FIND-FUNC">mutx_CondDelete</a>(pBarrier_a->pWaitingList); <a href="mutx_Delete.FIND-FUNC">mutx_Delete</a>(pBarrier_a->pMutex); <a href="dmem_Free.FIND-FUNC">dmem_Free</a>(<a href="DMEM_STD_SEGMENT.FIND-DEF">DMEM_STD_SEGMENT</a>, (<i>crtx_Void_t</i>*)pBarrier_a, <i>sizeof</i>(<i>brrl_Barrier_t</i>)); <b>return</b>;<font color="#6920ac">/************************ * EXCEPTION HANDLING * ************************/</font> <font color="#6920ac">/* None */</font>}<font color="#6920ac">/* blocking at the barrier lock */</font><font size="+1"><i>crtx_Void_t</i> <b><font color="azure1"><a name="brrl_Wait">brrl_Wait</a></font></b>(<i>brrl_Barrier_t</i> *pBarrier_a){</font><font color="#6920ac">/********************* *********************/</font> <font color="#6920ac">/* None */</font><font color="#6920ac">/********************* * PROCEDURE LOGIC * *********************/</font> <a href="mutx_Lock.FIND-FUNC">mutx_Lock</a>(pBarrier_a->pMutex); pBarrier_a->Arrived++; <b>if</b> (pBarrier_a->Arrived == pBarrier_a->Count) { <font color="#6920ac">/* last task has arrived */</font> <font color="#6920ac">/* reaset a counter of arrived tasks */</font> pBarrier_a->Arrived = 0; <font color="#6920ac">/* wakeup all waiting tasks */</font> <a href="mutx_Broadcast.FIND-FUNC">mutx_Broadcast</a>(pBarrier_a->pWaitingList); } <b>else</b> { <font color="#6920ac">/* wait for more tasks to arrive */</font> <a href="mutx_Wait.FIND-FUNC">mutx_Wait</a>(pBarrier_a->pWaitingList, <a href="CRTX_NULL.FIND-DEF">CRTX_NULL</a>); } <a href="mutx_Unlock.FIND-FUNC">mutx_Unlock</a>(pBarrier_a->pMutex); <b>return</b>;<font color="#6920ac">/************************ * EXCEPTION HANDLING * ************************/</font> <font color="#6920ac">/* None */</font>}</pre></BODY></HTML>?? 快捷鍵說明
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