FreeCalypso > hg > fc-selenite
diff src/nucleus/pmc.c @ 7:0f80e1e4dce4
src/nucleus: library C code import from FreeNucleus package
| author | Mychaela Falconia <falcon@freecalypso.org> |
|---|---|
| date | Sun, 15 Jul 2018 20:57:33 +0000 |
| parents | |
| children |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/nucleus/pmc.c Sun Jul 15 20:57:33 2018 +0000 @@ -0,0 +1,889 @@ +/*************************************************************************/ +/* */ +/* 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 */ +/* */ +/* pmc.c Nucleus PLUS 1.14 */ +/* */ +/* COMPONENT */ +/* */ +/* PM - Partition Memory Management */ +/* */ +/* DESCRIPTION */ +/* */ +/* This file contains the core routines for the Partition Memory */ +/* Management component. */ +/* */ +/* DATA STRUCTURES */ +/* */ +/* None */ +/* */ +/* FUNCTIONS */ +/* */ +/* PMC_Create_Partition_Pool Create a Partition Pool */ +/* PMC_Delete_Partition_Pool Delete a Partition Pool */ +/* PMC_Allocate_Partition Allocate a partition from a */ +/* pool */ +/* PMC_Deallocate_Partition Deallocate a partition from */ +/* a pool */ +/* PMC_Cleanup Cleanup on timeout or a */ +/* terminate condition */ +/* */ +/* DEPENDENCIES */ +/* */ +/* cs_extr.h Common Service functions */ +/* tc_extr.h Thread Control functions */ +/* pm_extr.h Partition functions */ +/* hi_extr.h History functions */ +/* */ +/* 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 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 */ +/* */ +/* 03-18-1994 Verified version 1.1 */ +/* 04-17-1996 updated to version 1.2 */ +/* 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 "pm_extr.h" /* Partition functions */ +#include "hi_extr.h" /* History functions */ +#include "profiler.h" /* ProView interface */ + + +/* Define external inner-component global data references. */ + +extern CS_NODE *PMD_Created_Pools_List; +extern UNSIGNED PMD_Total_Pools; +extern TC_PROTECT PMD_List_Protect; + + +/* Define internal component function prototypes. */ + +VOID PMC_Cleanup(VOID *information); + + +/*************************************************************************/ +/* */ +/* FUNCTION */ +/* */ +/* PMC_Create_Partition_Pool */ +/* */ +/* DESCRIPTION */ +/* */ +/* This function creates a memory partition pool and then places it */ +/* on the list of created partition pools. */ +/* */ +/* CALLED BY */ +/* */ +/* Application */ +/* PMCE_Create_Partition_Pool 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 */ +/* */ +/* pool_ptr Partition pool control block */ +/* pointer */ +/* name Partition pool name */ +/* start_address Starting address of the pool */ +/* pool_size Number of bytes in the pool */ +/* partition_size Number of bytes in each */ +/* partition of the pool */ +/* suspend_type Suspension type */ +/* */ +/* OUTPUTS */ +/* */ +/* NU_SUCCESS */ +/* */ +/* HISTORY */ +/* */ +/* DATE REMARKS */ +/* */ +/* 03-01-1993 Created initial version 1.0 */ +/* 04-19-1993 Verified version 1.0 */ +/* 03-01-1994 Changed function interfaces to */ +/* match those in prototype, */ +/* added register options, */ +/* resulting in version 1.1 */ +/* */ +/* 03-18-1994 Verified version 1.1 */ +/* */ +/*************************************************************************/ +STATUS PMC_Create_Partition_Pool(NU_PARTITION_POOL *pool_ptr, CHAR *name, + VOID *start_address, UNSIGNED pool_size, + UNSIGNED partition_size, OPTION suspend_type) +{ + +R1 PM_PCB *pool; /* Pool control block ptr */ +INT i; /* Working index variable */ +BYTE_PTR pointer; /* Working byte pointer */ +PM_HEADER *header_ptr; /* Partition block header ptr*/ +NU_SUPERV_USER_VARIABLES + + /* Switch to supervisor mode */ + NU_SUPERVISOR_MODE(); + + /* Move input pool pointer into internal pointer. */ + pool = (PM_PCB *) pool_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_PARTITION_POOL_ID, (UNSIGNED) pool, + (UNSIGNED) name, (UNSIGNED) start_address); + +#endif + + /* First, clear the partition pool ID just in case it is an old + pool control block. */ + pool -> pm_id = 0; + + /* Fill in the partition pool name. */ + for (i = 0; i < NU_MAX_NAME; i++) + pool -> pm_name[i] = name[i]; + + /* Save the starting address and size parameters in the partition control + block. */ + pool -> pm_start_address = start_address; + pool -> pm_pool_size = pool_size; + pool -> pm_partition_size = partition_size; + + /* Setup the partition pool suspension type. */ + if (suspend_type == NU_FIFO) + + /* FIFO suspension is selected, setup the flag accordingly. */ + pool -> pm_fifo_suspend = NU_TRUE; + else + + /* Priority suspension is selected. */ + pool -> pm_fifo_suspend = NU_FALSE; + + /* Clear the suspension list pointer. */ + pool -> pm_suspension_list = NU_NULL; + + /* Clear the number of tasks waiting on the partition pool. */ + pool -> pm_tasks_waiting = 0; + + /* Initialize link pointers. */ + pool -> pm_created.cs_previous = NU_NULL; + pool -> pm_created.cs_next = NU_NULL; + + /* Initialize the partition parameters. */ + pool -> pm_available = 0; + pool -> pm_allocated = 0; + pool -> pm_available_list = NU_NULL; + + /* Convert the supplied partition size into something that is evenly + divisible by the sizeof an UNSIGNED data element. This insures + UNSIGNED alignment. */ + partition_size = + ((partition_size + sizeof(UNSIGNED) - 1)/sizeof(UNSIGNED)) * + sizeof(UNSIGNED); + + /* Loop to build and link as many partitions as possible from within the + specified memory area. */ + pointer = (BYTE_PTR) start_address; + while (pool_size >= (PM_OVERHEAD + partition_size)) + { + + /* There is room for another partition. */ + + /* Cast the current pointer variable to a header pointer. */ + header_ptr = (PM_HEADER *) pointer; + + /* Now, build a header and link it into the partition pool + available list- at the front. */ + header_ptr -> pm_partition_pool = pool; + header_ptr -> pm_next_available = pool -> pm_available_list; + pool -> pm_available_list = header_ptr; + + /* Increment the number of partitions available in the pool. */ + pool -> pm_available++; + + /* Decrement the number of bytes remaining in the pool. */ + pool_size = pool_size - (PM_OVERHEAD + partition_size); + + /* Increment the working pointer to the next partition position. */ + pointer = pointer + (PM_OVERHEAD + partition_size); + } + + /* Protect against access to the list of created partition pools. */ + TCT_Protect(&PMD_List_Protect); + + /* At this point the partition pool is completely built. The ID can + now be set and it can be linked into the created partition pool list. */ + pool -> pm_id = PM_PARTITION_ID; + + /* Link the partition pool into the list of created partition pools and + increment the total number of pools in the system. */ + CSC_Place_On_List(&PMD_Created_Pools_List, &(pool -> pm_created)); + PMD_Total_Pools++; + +#ifdef INCLUDE_PROVIEW + _RTProf_DumpPartitionPool(RT_PROF_CREATE_PARTITION_POOL,pool,RT_PROF_OK); +#endif /* INCLUDE_PROVIEW */ + /* Release protection against access to the list of created partition + pools. */ + TCT_Unprotect(); + + /* Return to user mode */ + NU_USER_MODE(); + + /* Return successful completion. */ + return(NU_SUCCESS); +} + + +/*************************************************************************/ +/* */ +/* FUNCTION */ +/* */ +/* PMC_Delete_Partition_Pool */ +/* */ +/* DESCRIPTION */ +/* */ +/* This function deletes a memory partition pool and removes it from*/ +/* the list of created partition pools. All tasks suspended on the */ +/* partition pool are resumed with the appropriate error status. */ +/* Note that this function does not free any memory associated with */ +/* either the pool area or the pool control block. */ +/* */ +/* CALLED BY */ +/* */ +/* Application */ +/* PMCE_Delete_Partition_Pool Error checking shell */ +/* */ +/* CALLS */ +/* */ +/* CSC_Remove_From_List Remove node from list */ +/* [HIC_Make_History_Entry] Make entry in history log */ +/* TCC_Resume_Task Resume a suspended task */ +/* [TCT_Check_Stack] Stack checking function */ +/* TCT_Control_To_System Transfer control to system */ +/* TCT_Protect Protect created list */ +/* TCT_Set_Current_Protect Modify current protection */ +/* TCT_System_Protect Setup system protection */ +/* TCT_System_Unprotect Release system protection */ +/* TCT_Unprotect Release protection */ +/* */ +/* INPUTS */ +/* */ +/* pool_ptr Partition pool control block */ +/* pointer */ +/* */ +/* OUTPUTS */ +/* */ +/* NU_SUCCESS */ +/* */ +/* HISTORY */ +/* */ +/* DATE REMARKS */ +/* */ +/* 03-01-1993 Created initial version 1.0 */ +/* 04-19-1993 Verified version 1.0 */ +/* 03-01-1994 Changed function interfaces to */ +/* match those in prototype, */ +/* added register options, changed */ +/* protection logic to reduce */ +/* overhead, resulting in */ +/* version 1.1 */ +/* */ +/* 03-18-1994 Verified version 1.1 */ +/* */ +/*************************************************************************/ +STATUS PMC_Delete_Partition_Pool(NU_PARTITION_POOL *pool_ptr) +{ + +R1 PM_PCB *pool; /* Pool control block ptr */ +PM_SUSPEND *suspend_ptr; /* Suspend block pointer */ +PM_SUSPEND *next_ptr; /* Next suspend block */ +STATUS preempt; /* Status for resume call */ +NU_SUPERV_USER_VARIABLES + + /* Switch to supervisor mode */ + NU_SUPERVISOR_MODE(); + + /* Move input pool pointer into internal pointer. */ + pool = (PM_PCB *) pool_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_DELETE_PARTITION_POOL_ID, (UNSIGNED) pool, + (UNSIGNED) 0, (UNSIGNED) 0); + +#endif + + /* Protect against simultaneous access to the partition pool. */ + TCT_System_Protect(); + +#ifdef INCLUDE_PROVIEW + _RTProf_DumpPartitionPool(RT_PROF_DELETE_PARTITION_POOL,pool,RT_PROF_OK); +#endif /* INCLUDE_PROVIEW */ + + /* Clear the partition pool ID. */ + pool -> pm_id = 0; + + /* Release protection. */ + TCT_Unprotect(); + + /* Protect against access to the list of created partition pools. */ + TCT_Protect(&PMD_List_Protect); + + /* Remove the partition pool from the list of created partition pools. */ + CSC_Remove_From_List(&PMD_Created_Pools_List, &(pool -> pm_created)); + + /* Decrement the total number of created partition pools. */ + PMD_Total_Pools--; + + /* Pickup the suspended task pointer list. */ + suspend_ptr = pool -> pm_suspension_list; + + /* Walk the chain task(s) currently suspended on the partition pool. */ + preempt = 0; + while (suspend_ptr) + { + + /* Protect against system access. */ + TCT_System_Protect(); + + /* Resume the suspended task. Insure that the status returned is + NU_POOL_DELETED. */ + suspend_ptr -> pm_return_pointer = NU_NULL; + suspend_ptr -> pm_return_status = NU_POOL_DELETED; + + /* Point to the next suspend structure in the link. */ + next_ptr = (PM_SUSPEND *) (suspend_ptr -> pm_suspend_link.cs_next); + + /* Resume the specified task. */ + preempt = preempt | + TCC_Resume_Task((NU_TASK *) suspend_ptr -> pm_suspended_task, + NU_PARTITION_SUSPEND); + + /* Determine if the next is the same as the current pointer. */ + if (next_ptr == pool -> pm_suspension_list) + + /* Clear the suspension pointer to signal the end of the list + traversal. */ + suspend_ptr = NU_NULL; + else + + /* Move the next pointer into the suspend block pointer. */ + suspend_ptr = next_ptr; + + /* Modify current protection. */ + TCT_Set_Current_Protect(&PMD_List_Protect); + + /* Clear the system protection. */ + TCT_System_Unprotect(); + } + + /* Determine if preemption needs to occur. */ + if (preempt) + + /* Transfer control to system to facilitate preemption. */ + TCT_Control_To_System(); + + /* Release protection against access to the list of created partition + pools. */ + TCT_Unprotect(); + + /* Return to user mode */ + NU_USER_MODE(); + + /* Return a successful completion. */ + return(NU_SUCCESS); +} + + +/*************************************************************************/ +/* */ +/* FUNCTION */ +/* */ +/* PMC_Allocate_Partition */ +/* */ +/* DESCRIPTION */ +/* */ +/* This function allocates a memory partition from the specified */ +/* memory partition pool. If a memory partition is currently */ +/* available, this function is completed immediately. Otherwise, */ +/* if there are no partitions currently available, suspension is */ +/* possible. */ +/* */ +/* CALLED BY */ +/* */ +/* Application */ +/* PMCE_Allocate_Partition Error checking shell */ +/* */ +/* CALLS */ +/* */ +/* CSC_Place_On_List Place on suspend list */ +/* CSC_Priority_Place_On_List Place on priority list */ +/* [HIC_Make_History_Entry] Make entry in history log */ +/* TCC_Suspend_Task Suspend calling task */ +/* TCC_Task_Priority Pickup task's priority */ +/* [TCT_Check_Stack] Stack checking function */ +/* TCT_Current_Thread Pickup current thread pointer*/ +/* TCT_System_Protect Protect partition pool */ +/* TCT_Unprotect Release protection */ +/* */ +/* INPUTS */ +/* */ +/* pool_ptr Memory partition pool pointer*/ +/* return_pointer Pointer to the destination */ +/* memory pointer */ +/* suspend Suspension option if full */ +/* */ +/* OUTPUTS */ +/* */ +/* NU_SUCCESS If service is successful */ +/* NU_NO_PARTITION No partitions are available */ +/* NU_TIMEOUT If timeout on service */ +/* NU_POOL_DELETED If partition pool deleted */ +/* during suspension */ +/* */ +/* HISTORY */ +/* */ +/* DATE REMARKS */ +/* */ +/* 03-01-1993 Created initial version 1.0 */ +/* 04-19-1993 Verified version 1.0 */ +/* 03-01-1994 Changed function interfaces to */ +/* match those in prototype, */ +/* added register options, changed */ +/* protection logic to reduce */ +/* overhead, resulting in */ +/* version 1.1 */ +/* */ +/* 03-18-1994 Verified version 1.1 */ +/* */ +/*************************************************************************/ +STATUS PMC_Allocate_Partition(NU_PARTITION_POOL *pool_ptr, + VOID **return_pointer, UNSIGNED suspend) +{ + +R1 PM_PCB *pool; /* Pool control block ptr */ +R2 PM_SUSPEND *suspend_ptr; /* Suspend block pointer */ +PM_SUSPEND suspend_block; /* Allocate suspension block */ +R3 PM_HEADER *partition_ptr; /* Pointer to partition */ +TC_TCB *task; /* Task pointer */ +STATUS status; /* Completion status */ +NU_SUPERV_USER_VARIABLES + + /* Switch to supervisor mode */ + NU_SUPERVISOR_MODE(); + + /* Move input pool pointer into internal pointer. */ + pool = (PM_PCB *) pool_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_ALLOCATE_PARTITION_ID, (UNSIGNED) pool, + (UNSIGNED) return_pointer, (UNSIGNED) suspend); + +#endif + + /* Initialize the status as successful. */ + status = NU_SUCCESS; + + /* Protect against simultaneous access to the partition pool. */ + TCT_System_Protect(); + + /* Determine if there is an available memory partition. */ + if (pool -> pm_available) + { + + /* Partition available. */ + + /* Decrement the available count. */ + pool -> pm_available--; + + /* Increment the allocated count. */ + pool -> pm_allocated++; + + /* Unlink the first memory partition and return the pointer to the + caller. */ + partition_ptr = pool -> pm_available_list; + pool -> pm_available_list = partition_ptr -> pm_next_available; + partition_ptr -> pm_next_available = NU_NULL; + + /* Return a memory address to the caller. */ + *return_pointer = (VOID *) (((BYTE_PTR) partition_ptr) + PM_OVERHEAD); + +#ifdef INCLUDE_PROVIEW + _RTProf_DumpPartitionPool(RT_PROF_ALLOCATE_PARTITION,pool,RT_PROF_OK); +#endif /* INCLUDE_PROVIEW */ + + } + else + { + + /* A partition is not available. Determine if suspension is + required. */ + if (suspend) + { + + /* Suspension is selected. */ + + /* Increment the number of tasks waiting. */ + pool -> pm_tasks_waiting++; + +#ifdef INCLUDE_PROVIEW + _RTProf_DumpPartitionPool(RT_PROF_ALLOCATE_PARTITION,pool,RT_PROF_WAIT); +#endif /* INCLUDE_PROVIEW */ + /* Setup the suspend block and suspend the calling task. */ + suspend_ptr = &suspend_block; + suspend_ptr -> pm_partition_pool = pool; + suspend_ptr -> pm_suspend_link.cs_next = NU_NULL; + suspend_ptr -> pm_suspend_link.cs_previous = NU_NULL; + task = (TC_TCB *) TCT_Current_Thread(); + suspend_ptr -> pm_suspended_task = task; + + /* Determine if priority or FIFO suspension is associated with the + partition pool. */ + if (pool -> pm_fifo_suspend) + { + + /* FIFO suspension is required. Link the suspend block into + the list of suspended tasks on this partition pool. */ + CSC_Place_On_List((CS_NODE **) + &(pool -> pm_suspension_list), + &(suspend_ptr -> pm_suspend_link)); + } + else + { + + /* Get the priority of the current thread so the suspend block + can be placed in the appropriate place. */ + suspend_ptr -> pm_suspend_link.cs_priority = + TCC_Task_Priority(task); + + CSC_Priority_Place_On_List((CS_NODE **) + &(pool -> pm_suspension_list), + &(suspend_ptr -> pm_suspend_link)); + } + + /* Finally, suspend the calling task. Note that the suspension call + automatically clears the protection on the partition pool. */ + TCC_Suspend_Task((NU_TASK *) task, NU_PARTITION_SUSPEND, + PMC_Cleanup, suspend_ptr, suspend); + + /* Pickup the return status. */ + status = suspend_ptr -> pm_return_status; + *return_pointer = suspend_ptr -> pm_return_pointer; + } + else + { + /* No suspension requested. Simply return an error status. */ + status = NU_NO_PARTITION; + +#ifdef INCLUDE_PROVIEW + _RTProf_DumpPartitionPool(RT_PROF_ALLOCATE_PARTITION,pool,RT_PROF_FAIL); +#endif /* INCLUDE_PROVIEW */ + } + } + + /* Release protection of the partition pool. */ + TCT_Unprotect(); + + /* Return to user mode */ + NU_USER_MODE(); + + /* Return the completion status. */ + return(status); +} + + +/*************************************************************************/ +/* */ +/* FUNCTION */ +/* */ +/* PMC_Deallocate_Partition */ +/* */ +/* DESCRIPTION */ +/* */ +/* This function deallocates a previously allocated partition. If */ +/* there is a task waiting for a partition, the partition is simply */ +/* given to the waiting task and the waiting task is resumed. */ +/* Otherwise, the partition is returned to the partition pool. */ +/* */ +/* CALLED BY */ +/* */ +/* Application */ +/* PMCE_Deallocate_Partition Error checking shell */ +/* */ +/* CALLS */ +/* */ +/* CSC_Remove_From_List Remove from suspend list */ +/* [HIC_Make_History_Entry] Make entry in history log */ +/* TCC_Resume_Task Resume a suspended task */ +/* [TCT_Check_Stack] Stack checking function */ +/* TCT_Control_To_System Transfer control to system */ +/* TCT_System_Protect Protect partition pool */ +/* TCT_Unprotect Release protection */ +/* */ +/* INPUTS */ +/* */ +/* partition Pointer to partition memory */ +/* */ +/* OUTPUTS */ +/* */ +/* NU_SUCCESS */ +/* */ +/* HISTORY */ +/* */ +/* DATE REMARKS */ +/* */ +/* 03-01-1993 Created initial version 1.0 */ +/* 04-19-1993 Verified version 1.0 */ +/* 03-01-1994 Added register options, changed */ +/* protection logic to reduce */ +/* overhead, resulting in */ +/* version 1.1 */ +/* */ +/* 03-18-1994 Verified version 1.1 */ +/* */ +/*************************************************************************/ +STATUS PMC_Deallocate_Partition(VOID *partition) +{ + +R1 PM_PCB *pool; /* Pool pointer */ +R3 PM_SUSPEND *suspend_ptr; /* Pointer to suspend block */ +R2 PM_HEADER *header_ptr; /* Pointer to partition hdr */ +STATUS preempt; /* Preemption flag */ +STATUS status; /* Completion status */ +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 + +#ifdef NU_ENABLE_HISTORY + + /* Make an entry that corresponds to this function in the system history + log. */ + HIC_Make_History_Entry(NU_DEALLOCATE_PARTITION_ID, (UNSIGNED) partition, + (UNSIGNED) 0, (UNSIGNED) 0); + +#endif + + /* Initialize the status as successful. */ + status = NU_SUCCESS; + + /* Pickup the associated pool's pointer. It is inside the header of + each partition. */ + header_ptr = (PM_HEADER *) (((BYTE_PTR) partition) - PM_OVERHEAD); + pool = header_ptr -> pm_partition_pool; + + /* Protect against simultaneous access to the partition pool. */ + TCT_System_Protect(); + + /* Determine if another task is waiting for a partition from the pool. */ + if (pool -> pm_tasks_waiting) + { + + /* Yes, another task is waiting for a partition from the pool. */ + + /* Decrement the number of tasks waiting counter. */ + pool -> pm_tasks_waiting--; + +#ifdef INCLUDE_PROVIEW + _RTProf_DumpPartitionPool(RT_PROF_DEALLOCATE_PARTITION,pool,RT_PROF_OK); +#endif /* INCLUDE_PROVIEW */ + + /* Remove the first suspended block from the list. */ + suspend_ptr = pool -> pm_suspension_list; + CSC_Remove_From_List((CS_NODE **) &(pool -> pm_suspension_list), + &(suspend_ptr -> pm_suspend_link)); + + /* Setup the appropriate return value. */ + suspend_ptr -> pm_return_status = NU_SUCCESS; + suspend_ptr -> pm_return_pointer = partition; + + /* Resume the suspended task. */ + preempt = + TCC_Resume_Task((NU_TASK *) suspend_ptr -> pm_suspended_task, + NU_PARTITION_SUSPEND); + + /* Determine if a preempt condition is present. */ + if (preempt) + + /* Transfer control to the system if the resumed task function + detects a preemption condition. */ + TCT_Control_To_System(); + } + else + { + + /* Increment the available partitions counter. */ + pool -> pm_available++; + + /* Decrement the allocated partitions counter. */ + pool -> pm_allocated--; + + /* Place the partition back on the available list. */ + header_ptr -> pm_next_available = pool -> pm_available_list; + pool -> pm_available_list = header_ptr; + +#ifdef INCLUDE_PROVIEW + _RTProf_DumpPartitionPool(RT_PROF_DEALLOCATE_PARTITION,pool,RT_PROF_OK); +#endif /* INCLUDE_PROVIEW */ + + } + + /* Release protection of the partition pool. */ + TCT_Unprotect(); + + /* Return to user mode */ + NU_USER_MODE(); + + /* Return the completion status. */ + return(status); +} + + +/*************************************************************************/ +/* */ +/* FUNCTION */ +/* */ +/* PMC_Cleanup */ +/* */ +/* DESCRIPTION */ +/* */ +/* This function is responsible for removing a suspension block */ +/* from a partition pool. It is not called unless a timeout or */ +/* a task terminate is in progress. Note that protection is */ +/* already in effect - the same protection at suspension time. */ +/* */ +/* CALLED BY */ +/* */ +/* TCC_Timeout Task timeout */ +/* TCC_Terminate Task terminate */ +/* */ +/* CALLS */ +/* */ +/* CSC_Remove_From_List Remove suspend block from */ +/* the suspension list */ +/* */ +/* INPUTS */ +/* */ +/* information Pointer to suspend block */ +/* */ +/* OUTPUTS */ +/* */ +/* None */ +/* */ +/* HISTORY */ +/* */ +/* DATE REMARKS */ +/* */ +/* 03-01-1993 Created initial version 1.0 */ +/* 04-19-1993 Verified version 1.0 */ +/* */ +/*************************************************************************/ +VOID PMC_Cleanup(VOID *information) +{ + +PM_SUSPEND *suspend_ptr; /* Suspension block pointer */ +NU_SUPERV_USER_VARIABLES + + /* Switch to supervisor mode */ + NU_SUPERVISOR_MODE(); + + /* Use the information pointer as a suspend pointer. */ + suspend_ptr = (PM_SUSPEND *) information; + + /* By default, indicate that the service timed-out. It really does not + matter if this function is called from a terminate request since + the task does not resume. */ + suspend_ptr -> pm_return_status = NU_TIMEOUT; + suspend_ptr -> pm_return_pointer = NU_NULL; + + /* Decrement the number of tasks waiting counter. */ + (suspend_ptr -> pm_partition_pool) -> pm_tasks_waiting--; + + /* Unlink the suspend block from the suspension list. */ + CSC_Remove_From_List((CS_NODE **) + &((suspend_ptr -> pm_partition_pool) -> pm_suspension_list), + &(suspend_ptr -> pm_suspend_link)); + + /* Return to user mode */ + NU_USER_MODE(); +} + + + + +