?? pmc.c
字號(hào):
/* 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. */
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