os_core.c

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/********************
*Project: 80X86 32BIT MULTI TASKING OPERATING SYSTEM
*Description: Core of  multi-tasking kernel

*Author: Book Chen
*Date: 2010.01.01
*********************
*/
#include "includes.h"

const U8 OsUnkown[]="UNKNOW";

U32 OsTaskSwitch;
U32 OsTaskCurrent;
U32 OsTaskNext;
U32 OsIntNesting;
U32 OsRunning;
U8 OsHasIntNesting;

void OsInit(void){
    OsCoreInit();
    OsTaskInit();
    OsSchedulerInit();
    OsEventInit();
    OsResourceInit();
    OsTimeInit();
}

void OsCoreInit(void){
    OsIntNesting=0;
    OsTaskSwitch=0;
    OsRunning=0;
    OsHasIntNesting=0;
}

void OsStart(void){  
    if(OsRunning==false)
        if(OsSchedulerFindRootTask()==true)
            OsRootTaskStart();
    while(1);
}

void OsYield(void){ 
    OsTaskSwitchOut();
}

void OsFinish(void){
    OS_TASKENTRY *pOsTask;
    #if(OS_CRITICAL_METHOD==3)
        U32 CpuEflags;
    #endif
    
    OsEnterCritical(); 
    pOsTask=(OS_TASKENTRY *)OsTaskCurrent;
    OsTaskFreeTaskPut(pOsTask);
    OsTaskSwitchOut();
    OsExitCritical();
}

OS_BOOL OsDelete(U8 *pTaskName){
    #if(OS_CRITICAL_METHOD==3)
        U32 CpuEflags;
    #endif
    
    OsEnterCritical();
    if(OsTaskReadyTaskFind(pTaskName)==OS_TRUE){
        OsTaskReadyTaskDelete(pTaskName);
        OsExitCritical();
        return OS_TRUE;
    }
    else if(OsEventTaskFind(pTaskName)==OS_TRUE){
        OsEventTaskDelete(pTaskName);
        OsExitCritical();
        return OS_TRUE;
    }
    else if(OsResourceTaskFind(pTaskName)==OS_TRUE){
        OsResourceTaskDelete(pTaskName);
        OsExitCritical();
        return OS_TRUE;
    }
    else{
        OsExitCritical();
        return OS_FALSE;
    }
} 

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