μCOS-II中OS_Q.C源码中文注释版

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1、xilentz的网络文摘博客园   首页   新随笔   联系   订阅   管理随笔-204 文章-0 评论-10 trackbacks-0OS_Q.C/***********************************************************************************************************                                               uC/OS-II*                                       

2、  TheReal-TimeKernel*                                       MESSAGEQUEUEMANAGEMENT**                         (c)Copyright1992-2002,JeanJ.Labrosse,Weston,FL*                                          AllRightsReserved**File:OS_Q.C*By  :JeanJ.Labrosse********************************

3、**************************************************************************/#ifndef OS_MASTER_FILE//防止编译器包含一些代码#include"includes.h"#endif#if(OS_Q_EN>0)&&(OS_MAX_QS>0)/***********************************************************************************************************       

4、                              ACCEPTMESSAGEFROMQUEUE**Description:Thisfunctionchecksthequeuetoseeifamessageisavailable. UnlikeOSQPend(),*             OSQAccept()doesnotsuspendthecallingtaskifamessageisnotavailable.**Arguments :pevent       isapointertotheeventcontrolblock**Return

5、s   :!=(void*)0 isthemessageinthequeueifoneisavailable. Themessageisremoved*                           fromthesothenexttimeOSQAccept()iscalled,thequeuewillcontain*                           onelessentry.*             ==(void*)0 ifthequeueisemptyor,*                           if'p

6、event'isaNULLpointeror,*                           ifyoupassedaninvalideventtype**********************************************************************************************************/#ifOS_Q_ACCEPT_EN>0void *OSQAccept(OS_EVENT*pevent){#ifOS_CRITICAL_METHOD==3                 

7、    /*AllocatestorageforCPUstatusregister          */   OS_CPU_SR cpu_sr;#endif   void     *msg;   OS_Q     *pq;#ifOS_ARG_CHK_EN>0   if(pevent==(OS_EVENT*)0){              /*Validate'pevent'                                 */       return((void*)0);   }   if(pevent->OSEventType!=

8、OS_EVENT_TYPE_Q){/*Validateeventblocktyp