smce.c

nuclues 内核源代码已经在arm7-9 上作了移植

/*                                                                       */
/*      03-01-1993      Created initial version 1.0                      */
/*      04-19-1993      Verified version 1.0                             */
/*      03-01-1994      Modified function interface,                     */
/*                        resulting in version 1.1                       */
/*                                                                       */
/*      03-18-1994      Verified version 1.1                             */
/*                                                                       */
/*************************************************************************/
STATUS  SMCE_Delete_Semaphore(NU_SEMAPHORE *semaphore_ptr)
{

SM_SCB         *semaphore;                  /* Semaphore control blk ptr */
STATUS          status;                     /* Completion status         */


    /* Move input semaphore pointer into internal pointer.  */
    semaphore =  (SM_SCB *) semaphore_ptr;

    /* Determine if the semaphore pointer is valid.  */
    if ((semaphore) && (semaphore -> sm_id == SM_SEMAPHORE_ID))
    
        /* Semaphore pointer is valid, call function to delete it.  */
        status =  SMC_Delete_Semaphore(semaphore_ptr);
        
    else
    
        /* Semaphore pointer is invalid, indicate in completion status.  */
        status =  NU_INVALID_SEMAPHORE;
        
    /* Return completion status.  */
    return(status);
}


/*************************************************************************/
/*                                                                       */
/* FUNCTION                                                              */
/*                                                                       */
/*      SMCE_Obtain_Semaphore                                            */
/*                                                                       */
/* DESCRIPTION                                                           */
/*                                                                       */
/*      This function performs error checking on the parameters supplied */
/*      to the obtain semaphore function.                                */
/*                                                                       */
/* AUTHOR                                                                */
/*                                                                       */
/*      Accelerated Technology, Inc.                                     */
/*                                                                       */
/* CALLED BY                                                             */
/*                                                                       */
/*      Application                                                      */
/*                                                                       */
/* CALLS                                                                 */
/*                                                                       */
/*      SMC_Obtain_Semaphore                Actual function to obtain an */
/*                                            instance of the semaphore  */
/*      TCCE_Suspend_Error                  Check for illegal suspend    */
/*                                                                       */
/* INPUTS                                                                */
/*                                                                       */
/*      semaphore_ptr                       Semaphore control block ptr  */
/*      suspend                             Suspension option if full    */
/*                                                                       */
/* OUTPUTS                                                               */
/*                                                                       */
/*      NU_INVALID_SEMAPHORE                Invalid semaphore pointer    */
/*      NU_INVALID_SUSPEND                  Suspension from non-task     */
/*                                                                       */
/* HISTORY                                                               */
/*                                                                       */
/*         DATE                    REMARKS                               */
/*                                                                       */
/*      03-01-1993      Created initial version 1.0                      */
/*      04-19-1993      Verified version 1.0                             */
/*      03-01-1994      Modified function interface,                     */
/*                        resulting in version 1.1                       */
/*                                                                       */
/*      03-18-1994      Verified version 1.1                             */
/*                                                                       */
/*************************************************************************/
STATUS  SMCE_Obtain_Semaphore(NU_SEMAPHORE *semaphore_ptr, UNSIGNED suspend)
{

SM_SCB         *semaphore;                  /* Semaphore control blk ptr */
STATUS          status;                     /* Completion status         */


    /* Move input semaphore pointer into internal pointer.  */
    semaphore =  (SM_SCB *) semaphore_ptr;

    /* Determine if semaphore pointer is invalid.  */
    if (semaphore == NU_NULL)
    
        /* Semaphore pointer is invalid, indicate in completion status.  */
        status =  NU_INVALID_SEMAPHORE;

    else if (semaphore -> sm_id != SM_SEMAPHORE_ID)
    
        /* Semaphore pointer is invalid, indicate in completion status.  */
        status =  NU_INVALID_SEMAPHORE;

    else if ((suspend) && (TCCE_Suspend_Error()))
    
        /* Suspension from an non-task thread.  */
        status =  NU_INVALID_SUSPEND;

    else 
    {
    
        /* Parameters are valid, call actual function.  */
        status =  SMC_Obtain_Semaphore(semaphore_ptr, suspend);
    }

    /* Return the completion status.  */
    return(status);
}


/*************************************************************************/
/*                                                                       */
/* FUNCTION                                                              */
/*                                                                       */
/*      SMCE_Release_Semaphore                                           */
/*                                                                       */
/* DESCRIPTION                                                           */
/*                                                                       */
/*      This function performs error checking on the parameters supplied */
/*      to the release semaphore function.                               */
/*                                                                       */
/* AUTHOR                                                                */
/*                                                                       */
/*      Accelerated Technology, Inc.                                     */
/*                                                                       */
/* CALLED BY                                                             */
/*                                                                       */
/*      Application                                                      */
/*                                                                       */
/* CALLS                                                                 */
/*                                                                       */
/*      SMC_Release_Semaphore               Actual release semaphore fct.*/
/*                                                                       */
/* INPUTS                                                                */
/*                                                                       */
/*      semaphore_ptr                       Semaphore control block ptr  */
/*                                                                       */
/* OUTPUTS                                                               */
/*                                                                       */
/*      NU_INVALID_SEMAPHORE                Invalid semaphore pointer    */
/*                                                                       */
/* HISTORY                                                               */
/*                                                                       */
/*         DATE                    REMARKS                               */
/*                                                                       */
/*      03-01-1993      Created initial version 1.0                      */
/*      04-19-1993      Verified version 1.0                             */
/*      03-01-1994      Modified function interface,                     */
/*                        resulting in version 1.1                       */
/*                                                                       */
/*      03-18-1994      Verified version 1.1                             */
/*                                                                       */
/*************************************************************************/
STATUS  SMCE_Release_Semaphore(NU_SEMAPHORE *semaphore_ptr)
{

SM_SCB         *semaphore;                  /* Semaphore control blk ptr */
STATUS          status;                     /* Completion status         */


    /* Move input semaphore pointer into internal pointer.  */
    semaphore =  (SM_SCB *) semaphore_ptr;

    /* Determine if semaphore pointer is invalid.  */
    if (semaphore == NU_NULL)
    
        /* Semaphore pointer is invalid, indicate in completion status.  */
        status =  NU_INVALID_SEMAPHORE;

    else if (semaphore -> sm_id != SM_SEMAPHORE_ID)
    
        /* Semaphore pointer is invalid, indicate in completion status.  */
        status =  NU_INVALID_SEMAPHORE;

    else 
    {
    
        /* Parameters are valid, call actual function.  */
        status =  SMC_Release_Semaphore(semaphore_ptr);
    }

    /* Return the completion status.  */
    return(status);
}