FreeCalypso > hg > fc-tourmaline
diff src/nucleus/pif.c @ 0:4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
| author | Mychaela Falconia <falcon@freecalypso.org> |
|---|---|
| date | Fri, 16 Oct 2020 06:23:26 +0000 |
| parents | |
| children |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/nucleus/pif.c Fri Oct 16 06:23:26 2020 +0000 @@ -0,0 +1,393 @@ +/*************************************************************************/ +/* */ +/* Copyright Mentor Graphics Corporation 2002 */ +/* All Rights Reserved. */ +/* */ +/* THIS WORK CONTAINS TRADE SECRET AND PROPRIETARY INFORMATION WHICH IS */ +/* THE PROPERTY OF MENTOR GRAPHICS CORPORATION OR ITS LICENSORS AND IS */ +/* SUBJECT TO LICENSE TERMS. */ +/* */ +/*************************************************************************/ + +/*************************************************************************/ +/* */ +/* FILE NAME VERSION */ +/* */ +/* pif.c Nucleus PLUS 1.14 */ +/* */ +/* COMPONENT */ +/* */ +/* PI - Pipe Management */ +/* */ +/* DESCRIPTION */ +/* */ +/* This file contains routines to obtain facts about the Pipe */ +/* management component. */ +/* */ +/* DATA STRUCTURES */ +/* */ +/* None */ +/* */ +/* FUNCTIONS */ +/* */ +/* PIF_Established_Pipes Number of created pipes */ +/* PIF_Pipe_Information Retrieve pipe information */ +/* PIF_Pipe_Pointers Build pipe pointer list */ +/* */ +/* DEPENDENCIES */ +/* */ +/* cs_extr.h Common Service functions */ +/* tc_extr.h Thread Control functions */ +/* pi_extr.h Pipe functions */ +/* hi_extr.h History functions */ +/* */ +/* HISTORY */ +/* */ +/* DATE REMARKS */ +/* */ +/* 03-01-1994 Initial version of pipe fact */ +/* service file, version 1.1 */ +/* */ +/* 03-18-1994 Verified version 1.1 */ +/* 04-17-1996 updated to version 1.2 */ +/* 11-18-1996 Protected Informational service */ +/* from NULL Control Block pointers */ +/* creating 1.2a. (SPR220) */ +/* 03-24-1998 Released version 1.3 */ +/* 03-26-1999 Released 1.11m (new release */ +/* numbering scheme) */ +/* 04-17-2002 Released version 1.13m */ +/* 11-07-2002 Released version 1.14 */ +/*************************************************************************/ +#define NU_SOURCE_FILE + + +#include "cs_extr.h" /* Common service functions */ +#include "tc_extr.h" /* Thread control functions */ +#include "pi_extr.h" /* Pipe functions */ +#include "hi_extr.h" /* History functions */ + + +/* Define external inner-component global data references. */ + +extern CS_NODE *PID_Created_Pipes_List; +extern UNSIGNED PID_Total_Pipes; +extern TC_PROTECT PID_List_Protect; + + + +/*************************************************************************/ +/* */ +/* FUNCTION */ +/* */ +/* PIF_Established_Pipes */ +/* */ +/* DESCRIPTION */ +/* */ +/* This function returns the current number of established */ +/* pipes. Pipes previously deleted are no longer considered */ +/* established. */ +/* */ +/* CALLED BY */ +/* */ +/* Application */ +/* */ +/* CALLS */ +/* */ +/* [TCT_Check_Stack] Stack checking function */ +/* */ +/* INPUTS */ +/* */ +/* None */ +/* */ +/* OUTPUTS */ +/* */ +/* PID_Total_Pipes Number of established */ +/* pipes */ +/* */ +/* 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 */ +/* */ +/*************************************************************************/ +UNSIGNED PIF_Established_Pipes(VOID) +{ + + +#ifdef NU_ENABLE_STACK_CHECK + + /* Call stack checking function to check for an overflow condition. */ + TCT_Check_Stack(); + +#endif + + /* Return the number of established pipes. */ + return(PID_Total_Pipes); +} + + +/*************************************************************************/ +/* */ +/* FUNCTION */ +/* */ +/* PIF_Pipe_Pointers */ +/* */ +/* DESCRIPTION */ +/* */ +/* This function builds a list of pipe pointers, starting at the */ +/* specified location. The number of pipe pointers placed in the */ +/* list is equivalent to the total number of pipes or the maximum */ +/* number of pointers specified in the call. */ +/* */ +/* CALLED BY */ +/* */ +/* Application */ +/* */ +/* CALLS */ +/* */ +/* [TCT_Check_Stack] Stack checking function */ +/* TCT_Protect Protect created list */ +/* TCT_Unprotect Release protection */ +/* */ +/* INPUTS */ +/* */ +/* pointer_list Pointer to the list area */ +/* maximum_pointers Maximum number of pointers */ +/* */ +/* OUTPUTS */ +/* */ +/* pointers Number of pipe pointers */ +/* placed in the list */ +/* HISTORY */ +/* */ +/* DATE REMARKS */ +/* */ +/* 03-01-1993 Created initial version 1.0 */ +/* 04-19-1993 Verified version 1.0 */ +/* 08-09-1993 Corrected pointer retrieval */ +/* loop, resulting in version 1.0a */ +/* 08-09-1993 Verified version 1.0a */ +/* 03-01-1994 Modified function interface, */ +/* resulting in version 1.1 */ +/* */ +/* 03-18-1994 Verified version 1.1 */ +/* */ +/*************************************************************************/ +UNSIGNED PIF_Pipe_Pointers(NU_PIPE **pointer_list,UNSIGNED maximum_pointers) +{ + +CS_NODE *node_ptr; /* Pointer to each QCB */ +UNSIGNED pointers; /* Number of pointers in list*/ +NU_SUPERV_USER_VARIABLES + + /* Switch to supervisor mode */ + NU_SUPERVISOR_MODE(); + +#ifdef NU_ENABLE_STACK_CHECK + + /* Call stack checking function to check for an overflow condition. */ + TCT_Check_Stack(); + +#endif + + /* Initialize the number of pointers returned. */ + pointers = 0; + + /* Protect against access to the list of created pipes. */ + TCT_Protect(&PID_List_Protect); + + /* Loop until all pipe pointers are in the list or until the maximum + list size is reached. */ + node_ptr = PID_Created_Pipes_List; + while ((node_ptr) && (pointers < maximum_pointers)) + { + + /* Place the node into the destination list. */ + *pointer_list++ = (NU_PIPE *) node_ptr; + + /* Increment the pointers variable. */ + pointers++; + + /* Position the node pointer to the next node. */ + node_ptr = node_ptr -> cs_next; + + /* Determine if the pointer is at the head of the list. */ + if (node_ptr == PID_Created_Pipes_List) + + /* The list search is complete. */ + node_ptr = NU_NULL; + } + + /* Release protection against access to the list of created pipes. */ + TCT_Unprotect(); + + /* Return to user mode */ + NU_USER_MODE(); + + /* Return the number of pointers in the list. */ + return(pointers); +} + + +/*************************************************************************/ +/* */ +/* FUNCTION */ +/* */ +/* PIF_Pipe_Information */ +/* */ +/* DESCRIPTION */ +/* */ +/* This function returns information about the specified pipe. */ +/* However, if the supplied pipe pointer is invalid, the */ +/* function simply returns an error status. */ +/* */ +/* CALLED BY */ +/* */ +/* Application */ +/* */ +/* CALLS */ +/* */ +/* [TCT_Check_Stack] Stack checking function */ +/* TCT_System_Protect Protect pipe */ +/* TCT_Unprotect Release protection */ +/* */ +/* INPUTS */ +/* */ +/* pipe_ptr Pointer to the pipe */ +/* name Destination for the name */ +/* start_address Destination for the start */ +/* address of the pipe */ +/* pipe_size Destination for pipe size */ +/* available Destination for available */ +/* room in pipe */ +/* messages Destination for number of */ +/* messages piped */ +/* message_type Destination for message type */ +/* message_size Destination for message size */ +/* suspend_type Destination for suspension */ +/* type */ +/* tasks_waiting Destination for the tasks */ +/* waiting count */ +/* first_task Destination for the pointer */ +/* to the first task waiting */ +/* */ +/* OUTPUTS */ +/* */ +/* NU_SUCCESS If a valid pipe pointer */ +/* is supplied */ +/* NU_INVALID_PIPE If pipe pointer invalid */ +/* */ +/* 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 */ +/* 11-18-1996 Corrected SPR220 */ +/* */ +/*************************************************************************/ +STATUS PIF_Pipe_Information(NU_PIPE *pipe_ptr, CHAR *name, + VOID **start_address, UNSIGNED *pipe_size, + UNSIGNED *available, UNSIGNED *messages, + OPTION *message_type, UNSIGNED *message_size, + OPTION *suspend_type, UNSIGNED *tasks_waiting, + NU_TASK **first_task) +{ + +PI_PCB *pipe; /* Pipe control block ptr */ +INT i; /* Working integer variable */ +STATUS completion; /* Completion status */ +NU_SUPERV_USER_VARIABLES + + /* Switch to supervisor mode */ + NU_SUPERVISOR_MODE(); + + /* Move input pipe pointer into internal pointer. */ + pipe = (PI_PCB *) pipe_ptr; + + +#ifdef NU_ENABLE_STACK_CHECK + + /* Call stack checking function to check for an overflow condition. */ + TCT_Check_Stack(); + +#endif + + /* Determine if this pipe id is valid. */ + if ((pipe != NU_NULL) && (pipe -> pi_id == PI_PIPE_ID)) + { + + /* Setup protection of the pipe. */ + TCT_System_Protect(); + + /* The pipe pointer is valid. Reflect this in the completion + status and fill in the actual information. */ + completion = NU_SUCCESS; + + /* Copy the pipe's name. */ + for (i = 0; i < NU_MAX_NAME; i++) + *name++ = pipe -> pi_name[i]; + + /* Determine the suspension type. */ + if (pipe -> pi_fifo_suspend) + *suspend_type = NU_FIFO; + else + *suspend_type = NU_PRIORITY; + + /* Determine the message type. */ + if (pipe -> pi_fixed_size) + *message_type = NU_FIXED_SIZE; + else + *message_type = NU_VARIABLE_SIZE; + + /* Get various information about the pipe. */ + *start_address = (VOID *) pipe -> pi_start; + *pipe_size = pipe -> pi_pipe_size; + *available = pipe -> pi_available; + *messages = pipe -> pi_messages; + *message_size = pipe -> pi_message_size; + + /* Retrieve the number of tasks waiting and the pointer to the + first task waiting. */ + *tasks_waiting = pipe -> pi_tasks_waiting; + if (pipe -> pi_suspension_list) + + /* There is a task waiting. */ + *first_task = (NU_TASK *) + (pipe -> pi_suspension_list) -> pi_suspended_task; + else + + /* There are no tasks waiting. */ + *first_task = NU_NULL; + + /* Release protection of the pipe. */ + TCT_Unprotect(); + } + else + + /* Indicate that the pipe pointer is invalid. */ + completion = NU_INVALID_PIPE; + + /* Return to user mode */ + NU_USER_MODE(); + + /* Return the appropriate completion status. */ + return(completion); +} + + + + + +