FreeCalypso > hg > fc-tourmaline
view src/nucleus/pif.c @ 1:fa8dc04885d8
src/g23m-*: import from Magnetite
author | Mychaela Falconia <falcon@freecalypso.org> |
---|---|
date | Fri, 16 Oct 2020 06:25:50 +0000 |
parents | 4e78acac3d88 |
children |
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/*************************************************************************/ /* */ /* 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); }