📄 mbc.c
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/*************************************************************************/
/* */
/* Copyright (c) 1993-1998 Accelerated Technology, Inc. */
/* */
/* PROPRIETARY RIGHTS of Accelerated Technology are involved in the */
/* subject matter of this material. All manufacturing, reproduction, */
/* use, and sales rights pertaining to this subject matter are governed */
/* by the license agreement. The recipient of this software implicitly */
/* accepts the terms of the license. */
/* */
/*************************************************************************/
/*************************************************************************/
/* */
/* FILE NAME VERSION */
/* */
/* mbc.c PLUS 1.3 */
/* */
/* COMPONENT */
/* */
/* MB - Mailbox Management */
/* */
/* DESCRIPTION */
/* */
/* This file contains the core routines for the Mailbox management */
/* component. */
/* */
/* AUTHOR */
/* */
/* William E. Lamie, Accelerated Technology, Inc. */
/* */
/* DATA STRUCTURES */
/* */
/* None */
/* */
/* FUNCTIONS */
/* */
/* MBC_Create_Mailbox Create a mailbox */
/* MBC_Delete_Mailbox Delete a mailbox */
/* MBC_Reset_Mailbox Reset a mailbox */
/* MBC_Send_To_Mailbox Send a mailbox message */
/* MBC_Broadcast_To_Mailbox Broadcast a mailbox message */
/* MBC_Receive_From_Mailbox Receive a mailbox message */
/* MBC_Cleanup Cleanup on timeout or a */
/* terminate condition */
/* */
/* DEPENDENCIES */
/* */
/* cs_extr.h Common Service functions */
/* tc_extr.h Thread Control functions */
/* mb_extr.h Mailbox functions */
/* hi_extr.h History functions */
/* */
/* HISTORY */
/* */
/* NAME DATE REMARKS */
/* */
/* W. Lamie 03-01-1993 Created initial version 1.0 */
/* D. Lamie 04-19-1993 Verified version 1.0 */
/* W. Lamie 08-09-1993 Corrected pointer retrieval */
/* loop, resulting in version 1.0a */
/* D. Lamie 08-09-1993 Verified version 1.0a */
/* W. Lamie 03-01-1994 Moved non-core functions into */
/* supplemental files, changed */
/* function interfaces to match */
/* those in prototype, added */
/* register options, changed */
/* protection logic to reduce */
/* overhead, resulting in */
/* version 1.1 */
/* R. Pfaff - */
/* D. Lamie 03-18-1994 Verified version 1.1 */
/* M.Q. Qian 04-17-1996 updated to version 1.2 */
/* M. Trippi 03-24-1998 Released version 1.3. */
/* */
/*************************************************************************/
#define NU_SOURCE_FILE
#include "cs_extr.h" /* Common service functions */
#include "tc_extr.h" /* Thread control functions */
#include "mb_extr.h" /* Mailbox functions */
#include "hi_extr.h" /* History functions */
/* Define external inner-component global data references. */
extern CS_NODE *MBD_Created_Mailboxes_List;
extern UNSIGNED MBD_Total_Mailboxes;
extern TC_PROTECT MBD_List_Protect;
/* Define internal component function prototypes. */
VOID MBC_Cleanup(VOID *information);
/*************************************************************************/
/* */
/* FUNCTION */
/* */
/* MBC_Create_Mailbox */
/* */
/* DESCRIPTION */
/* */
/* This function creates a mailbox and then places it on the list */
/* of created mailboxes. */
/* */
/* AUTHOR */
/* */
/* William E. Lamie, Accelerated Technology, Inc. */
/* */
/* CALLED BY */
/* */
/* Application */
/* MBCE_Create_Mailbox Error checking shell */
/* */
/* CALLS */
/* */
/* CSC_Place_On_List Add node to linked-list */
/* [HIC_Make_History_Entry] Make entry in history log */
/* [TCT_Check_Stack] Stack checking function */
/* TCT_Protect Data structure protect */
/* TCT_Unprotect Un-protect data structure */
/* */
/* INPUTS */
/* */
/* mailbox_ptr Mailbox control block pointer*/
/* name Mailbox name */
/* suspend_type Suspension type */
/* */
/* OUTPUTS */
/* */
/* NU_SUCCESS */
/* */
/* HISTORY */
/* */
/* NAME DATE REMARKS */
/* */
/* W. Lamie 03-01-1993 Created initial version 1.0 */
/* D. Lamie 04-19-1993 Verified version 1.0 */
/* W. Lamie 03-01-1994 Changed function interface to */
/* match the prototype, added */
/* register variable logic, */
/* resulting in version 1.1 */
/* R. Pfaff - */
/* D. Lamie 03-18-1994 Verified version 1.1 */
/* */
/*************************************************************************/
STATUS MBC_Create_Mailbox(NU_MAILBOX *mailbox_ptr, CHAR *name,
OPTION suspend_type)
{
R1 MB_MCB *mailbox; /* Mailbox control block ptr */
INT i; /* Working index variable */
/* Move input mailbox pointer into internal pointer. */
mailbox = (MB_MCB *) mailbox_ptr;
#ifdef NU_ENABLE_STACK_CHECK
/* Call stack checking function to check for an overflow condition. */
TCT_Check_Stack();
#endif
#ifdef NU_ENABLE_HISTORY
/* Make an entry that corresponds to this function in the system history
log. */
HIC_Make_History_Entry(NU_CREATE_MAILBOX_ID, (UNSIGNED) mailbox,
(UNSIGNED) name, (UNSIGNED) suspend_type);
#endif
/* First, clear the mailbox ID just in case it is an old Mailbox
Control Block. */
mailbox -> mb_id = 0;
/* Fill in the mailbox name. */
for (i = 0; i < NU_MAX_NAME; i++)
mailbox -> mb_name[i] = name[i];
/* Clear the message present flag- initial it to "no message present." */
mailbox -> mb_message_present = NU_FALSE;
/* Setup the mailbox suspension type. */
if (suspend_type == NU_FIFO)
/* FIFO suspension is selected, setup the flag accordingly. */
mailbox -> mb_fifo_suspend = NU_TRUE;
else
/* Priority suspension is selected. */
mailbox -> mb_fifo_suspend = NU_FALSE;
/* Clear the suspension list pointer. */
mailbox -> mb_suspension_list = NU_NULL;
/* Clear the number of tasks waiting on the mailbox counter. */
mailbox -> mb_tasks_waiting = 0;
/* Initialize link pointers. */
mailbox -> mb_created.cs_previous = NU_NULL;
mailbox -> mb_created.cs_next = NU_NULL;
/* Protect against access to the list of created mailboxes. */
TCT_Protect(&MBD_List_Protect);
/* At this point the mailbox is completely built. The ID can now be
set and it can be linked into the created mailbox list. */
mailbox -> mb_id = MB_MAILBOX_ID;
/* Link the mailbox into the list of created mailboxes and increment the
total number of mailboxes in the system. */
CSC_Place_On_List(&MBD_Created_Mailboxes_List, &(mailbox -> mb_created));
MBD_Total_Mailboxes++;
/* Release protection against access to the list of created mailboxes. */
TCT_Unprotect();
/* Return successful completion. */
return(NU_SUCCESS);
}
/*************************************************************************/
/* */
/* FUNCTION */
/* */
/* MBC_Delete_Mailbox */
/* */
/* DESCRIPTION */
/* */
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