sem_core.c
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<HTML><HEAD><TITLE>/home/asysweb/public_html/cortex/kernel/src/sem_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><font color="#6920ac">/************************************************************************** * * FILE NAME * * sem_core.c * * SYSTEM COMPONENT * * Semaphore Component * * DESCRIPTION * * This file contains the core services for Semaphore * Component. * * SERVICES * * sema_Create create/initialise semaphore * sema_Delete destroy semaphore * sema_Post increment semaphore * sema_Wait waot on semaphore * * SCCS HISTORY * * @(#)sem_core.c 1.3, 01/25/99, 00:32:26 * * AUTHOR * * Vadim N. Azarovsky * * CREATED * * 12-Jun-1998 by Vadim N. Azarovsky * * REVISION HISTORY * * NAME DATE REMARKS * **************************************************************************/</font><b><font color='DarkGreen'>#include</font></b> <a href="sem_priv.h.FIND-INC"><font color="blue">"sem_priv.h"</font></a><b><font color='DarkGreen'>#include</font></b> <a href="ass_defs.h.FIND-INC"><font color="blue">"ass_defs.h"</font></a><b><font color='DarkGreen'>#include</font></b> <a href="swi_defs.h.FIND-INC"><font color="blue">"swi_defs.h"</font></a><b><font color='DarkGreen'>#include</font></b> <a href="hwi_defs.h.FIND-INC"><font color="blue">"hwi_defs.h"</font></a><b><font color='DarkGreen'>#include</font></b> <a href="thr_priv.h.FIND-INC"><font color="blue">"thr_priv.h"</font></a><font color="#6920ac">/* create/initialise semaphore */</font><font size="+1"><i>sema_Semaphore_t</i> *<b><font color="azure1"><a name="sema_Create">sema_Create</a></font></b>( <i>sema_Semaphore_t</i> *pSemaphore_a, <i>crtx_Int_t</i> InitValue_a, <i>crtx_Int_t</i> MaxValue_a, <i>sema_Attr_t</i> *pAttr_a){</font><font color="#6920ac">/********************* * LOCAL VARIABLES * *********************/</font> <font color="#6920ac">/* None */</font><font color="#6920ac">/********************* * PROCEDURE LOGIC * *********************/</font> <b>if</b> (pAttr_a == <a href="CRTX_NULL.FIND-DEF">CRTX_NULL</a>) pAttr_a = &sema_AttrDefault_g; <b>if</b> (pSemaphore_a == <a href="CRTX_NULL.FIND-DEF">CRTX_NULL</a>) { pSemaphore_a = (<i>sema_Semaphore_t</i>*)<a href="dmem_Alloc.FIND-FUNC">dmem_Alloc</a>(pAttr_a->Segment, <i>sizeof</i>(<i>sema_Semaphore_t</i>), <i>sizeof</i>(<i>crtx_Unsigned_t</i>)); <b>if</b> ((<i>crtx_Void_t</i>*)pSemaphore_a == (<i>crtx_Void_t</i>*)<a href="DMEM_ILLEGAL.FIND-DEF">DMEM_ILLEGAL</a>) { <font color="#6920ac">/* memory allocation error */</font> <a href="CRTX_EXCEPTION.FIND-DEF">CRTX_EXCEPTION</a> MemAllocError_Exc; } pSemaphore_a->Flags = <a href="SEMA_FLAG_INIT.FIND-DEF">SEMA_FLAG_INIT</a> | <a href="SEMA_FLAG_SEMAPHORE_ALLOC.FIND-DEF">SEMA_FLAG_SEMAPHORE_ALLOC</a>; } <b>else</b> { pSemaphore_a->Flags = <a href="SEMA_FLAG_INIT.FIND-DEF">SEMA_FLAG_INIT</a>; } <font color="#6920ac">/* initialise semaphore */</font> <a href="SEMA_SET_SUSP_POLICY.FIND-DEF">SEMA_SET_SUSP_POLICY</a>(pSemaphore_a, pAttr_a); pSemaphore_a->SemaValue = InitValue_a; pSemaphore_a->MaxValue = MaxValue_a; pSemaphore_a->Waiting = 0; pSemaphore_a->Segment = pAttr_a->Segment; <a href="RQUE_INIT_QUEUE.FIND-DEF">RQUE_INIT_QUEUE</a>(&pSemaphore_a->WaitingList); <b><font color='DarkGreen'>#if</font></b><font color="maroon"> ENVI_CRTX_ERR_CHECK_LEVEL > 0</font> <a href="SEMA_SET_SEMAPHORE_ID.FIND-DEF">SEMA_SET_SEMAPHORE_ID</a>(pSemaphore_a);<b><font color='DarkGreen'>#endif</font></b><font color="maroon"> <font color="#6920ac">/* ENVI_CRTX_ERR_CHECK_LEVEL > 0 */</font></font> <b>return</b> pSemaphore_a;<font color="#6920ac">/************************ * EXCEPTION HANDLING * ************************/</font><font color="blue">MemAllocError_Exc:</font> <font color="#6920ac">/* memory allocation error exception */</font> <b>return</b> <a href="CRTX_NULL.FIND-DEF">CRTX_NULL</a>;}<font color="#6920ac">/* destroy semaphore */</font><font size="+1"><i>crtx_Void_t</i> <b><font color="azure1"><a name="sema_Delete">sema_Delete</a></font></b>( <i>sema_Semaphore_t</i> *pSemaphore_a){</font><font color="#6920ac">/********************* * LOCAL VARIABLES * *********************/</font> <font color="#6920ac">/* None */</font><font color="#6920ac">/********************* * PROCEDURE LOGIC * *********************/</font> <a href="CRTX_ASSERT.FIND-DEF">CRTX_ASSERT</a>(pSemaphore_a)<b><font color='DarkGreen'>#if</font></b><font color="maroon"> ENVI_CRTX_ERR_CHECK_LEVEL > 0</font> <a href="CRTX_ASSERT.FIND-DEF">CRTX_ASSERT</a>(<a href="SEMA_CHECK_SEMAPHORE_ID.FIND-DEF">SEMA_CHECK_SEMAPHORE_ID</a>(pSemaphore_a))<b><font color='DarkGreen'>#endif</font></b><font color="maroon"> <font color="#6920ac">/* ENVI_CRTX_ERR_CHECK_LEVEL > 0 */</font></font> <b>if</b> (pSemaphore_a->Flags & <a href="SEMA_FLAG_SEMAPHORE_ALLOC.FIND-DEF">SEMA_FLAG_SEMAPHORE_ALLOC</a>) { <font color="#6920ac">/* release internaly allocated control block */</font> <a href="dmem_Free.FIND-FUNC">dmem_Free</a>(pSemaphore_a->Segment, (<i>crtx_Void_t</i>*)pSemaphore_a, <i>sizeof</i>(<i>sema_Semaphore_t</i>)); } <b>else</b> { pSemaphore_a->Flags = <a href="SEMA_FLAG_INIT.FIND-DEF">SEMA_FLAG_INIT</a>;<b><font color='DarkGreen'>#if</font></b><font color="maroon"> ENVI_CRTX_ERR_CHECK_LEVEL > 0</font> <a href="CRTX_SET_NO_ID.FIND-DEF">CRTX_SET_NO_ID</a>(pSemaphore_a); <font color="#6920ac">/* no id */</font><b><font color='DarkGreen'>#endif</font></b><font color="maroon"> <font color="#6920ac">/* ENVI_CRTX_ERR_CHECK_LEVEL > 0 */</font></font> } <b>return</b>;<font color="#6920ac">/************************ * EXCEPTION HANDLING * ************************/</font> <font color="#6920ac">/* None */</font>}<font color="#6920ac">/* wait on a semaphore */</font><font size="+1"><i>crtx_Void_t</i> <b><font color="azure1"><a name="sema_Wait">sema_Wait</a></font></b>(⌨️ 快捷键说明
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