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/**************************************************************************/
/* */
/* Copyright (c) Microsoft Corporation. All rights reserved. */
/* */
/* This software is licensed under the Microsoft Software License */
/* Terms for Microsoft Azure RTOS. Full text of the license can be */
/* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */
/* and in the root directory of this software. */
/* */
/**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** ThreadX Component */
/** */
/** Block Pool */
/** */
/**************************************************************************/
/**************************************************************************/
#define TX_SOURCE_CODE
/* Include necessary system files. */
#include "tx_api.h"
#ifdef TX_ENABLE_EVENT_TRACE
#include "tx_trace.h"
#endif
#include "tx_thread.h"
#include "tx_block_pool.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _tx_block_allocate PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* William E. Lamie, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function allocates a block from the specified memory block */
/* pool. */
/* */
/* INPUT */
/* */
/* pool_ptr Pointer to pool control block */
/* block_ptr Pointer to place allocated block */
/* pointer */
/* wait_option Suspension option */
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* */
/* CALLS */
/* */
/* _tx_thread_system_suspend Suspend thread */
/* _tx_thread_system_ni_suspend Non-interruptable suspend thread */
/* */
/* CALLED BY */
/* */
/* Application Code */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 William E. Lamie Initial Version 6.0 */
/* 09-30-2020 Yuxin Zhou Modified comment(s), */
/* resulting in version 6.1 */
/* */
/**************************************************************************/
UINT _tx_block_allocate(TX_BLOCK_POOL *pool_ptr, VOID **block_ptr, ULONG wait_option)
{
TX_INTERRUPT_SAVE_AREA
UINT status;
TX_THREAD *thread_ptr;
UCHAR *work_ptr;
UCHAR *temp_ptr;
UCHAR **next_block_ptr;
UCHAR **return_ptr;
UINT suspended_count;
TX_THREAD *next_thread;
TX_THREAD *previous_thread;
#ifdef TX_ENABLE_EVENT_TRACE
TX_TRACE_BUFFER_ENTRY *entry_ptr;
ULONG time_stamp = ((ULONG) 0);
#endif
#ifdef TX_ENABLE_EVENT_LOGGING
UCHAR *log_entry_ptr;
ULONG upper_tbu;
ULONG lower_tbu;
#endif
/* Disable interrupts to get a block from the pool. */
TX_DISABLE
#ifdef TX_BLOCK_POOL_ENABLE_PERFORMANCE_INFO
/* Increment the total allocations counter. */
_tx_block_pool_performance_allocate_count++;
/* Increment the number of allocations on this pool. */
pool_ptr -> tx_block_pool_performance_allocate_count++;
#endif
#ifdef TX_ENABLE_EVENT_TRACE
/* If trace is enabled, save the current event pointer. */
entry_ptr = _tx_trace_buffer_current_ptr;
/* If trace is enabled, insert this event into the trace buffer. */
TX_TRACE_IN_LINE_INSERT(TX_TRACE_BLOCK_ALLOCATE, pool_ptr, 0, wait_option, pool_ptr -> tx_block_pool_available, TX_TRACE_BLOCK_POOL_EVENTS)
/* Save the time stamp for later comparison to verify that
the event hasn't been overwritten by the time the allocate
call succeeds. */
if (entry_ptr != TX_NULL)
{
time_stamp = entry_ptr -> tx_trace_buffer_entry_time_stamp;
}
#endif
#ifdef TX_ENABLE_EVENT_LOGGING
log_entry_ptr = *(UCHAR **) _tx_el_current_event;
/* Log this kernel call. */
TX_EL_BLOCK_ALLOCATE_INSERT
/* Store -1 in the third event slot. */
*((ULONG *) (log_entry_ptr + TX_EL_EVENT_INFO_3_OFFSET)) = (ULONG) -1;
/* Save the time stamp for later comparison to verify that
the event hasn't been overwritten by the time the allocate
call succeeds. */
lower_tbu = *((ULONG *) (log_entry_ptr + TX_EL_EVENT_TIME_LOWER_OFFSET));
upper_tbu = *((ULONG *) (log_entry_ptr + TX_EL_EVENT_TIME_UPPER_OFFSET));
#endif
/* Determine if there is an available block. */
if (pool_ptr -> tx_block_pool_available != ((UINT) 0))
{
/* Yes, a block is available. Decrement the available count. */
pool_ptr -> tx_block_pool_available--;
/* Pickup the current block pointer. */
work_ptr = pool_ptr -> tx_block_pool_available_list;
/* Return the first available block to the caller. */
temp_ptr = TX_UCHAR_POINTER_ADD(work_ptr, (sizeof(UCHAR *)));
return_ptr = TX_INDIRECT_VOID_TO_UCHAR_POINTER_CONVERT(block_ptr);
*return_ptr = temp_ptr;
/* Modify the available list to point at the next block in the pool. */
next_block_ptr = TX_UCHAR_TO_INDIRECT_UCHAR_POINTER_CONVERT(work_ptr);
pool_ptr -> tx_block_pool_available_list = *next_block_ptr;
/* Save the pool's address in the block for when it is released! */
temp_ptr = TX_BLOCK_POOL_TO_UCHAR_POINTER_CONVERT(pool_ptr);
*next_block_ptr = temp_ptr;
#ifdef TX_ENABLE_EVENT_TRACE
/* Check that the event time stamp is unchanged. A different
timestamp means that a later event wrote over the byte
allocate event. In that case, do nothing here. */
if (entry_ptr != TX_NULL)
{
/* Is the time stamp the same? */
if (time_stamp == entry_ptr -> tx_trace_buffer_entry_time_stamp)
{
/* Timestamp is the same, update the entry with the address. */
#ifdef TX_MISRA_ENABLE
entry_ptr -> tx_trace_buffer_entry_info_2 = TX_POINTER_TO_ULONG_CONVERT(*block_ptr);
#else
entry_ptr -> tx_trace_buffer_entry_information_field_2 = TX_POINTER_TO_ULONG_CONVERT(*block_ptr);
#endif
}
}
#endif
#ifdef TX_ENABLE_EVENT_LOGGING
/* Store the address of the allocated block. */
*((ULONG *) (log_entry_ptr + TX_EL_EVENT_INFO_3_OFFSET)) = (ULONG) *block_ptr;
#endif
/* Set status to success. */
status = TX_SUCCESS;
/* Restore interrupts. */
TX_RESTORE
}
else
{
/* Default the return pointer to NULL. */
return_ptr = TX_INDIRECT_VOID_TO_UCHAR_POINTER_CONVERT(block_ptr);
*return_ptr = TX_NULL;
/* Determine if the request specifies suspension. */
if (wait_option != TX_NO_WAIT)
{
/* Determine if the preempt disable flag is non-zero. */
if (_tx_thread_preempt_disable != ((UINT) 0))
{
/* Suspension is not allowed if the preempt disable flag is non-zero at this point, return error completion. */
status = TX_NO_MEMORY;
/* Restore interrupts. */
TX_RESTORE
}
else
{
/* Prepare for suspension of this thread. */
#ifdef TX_BLOCK_POOL_ENABLE_PERFORMANCE_INFO
/* Increment the total suspensions counter. */
_tx_block_pool_performance_suspension_count++;
/* Increment the number of suspensions on this pool. */
pool_ptr -> tx_block_pool_performance_suspension_count++;
#endif
/* Pickup thread pointer. */
TX_THREAD_GET_CURRENT(thread_ptr)
/* Setup cleanup routine pointer. */
thread_ptr -> tx_thread_suspend_cleanup = &(_tx_block_pool_cleanup);
/* Setup cleanup information, i.e. this pool control
block. */
thread_ptr -> tx_thread_suspend_control_block = (VOID *) pool_ptr;
/* Save the return block pointer address as well. */
thread_ptr -> tx_thread_additional_suspend_info = (VOID *) block_ptr;
#ifndef TX_NOT_INTERRUPTABLE
/* Increment the suspension sequence number, which is used to identify
this suspension event. */
thread_ptr -> tx_thread_suspension_sequence++;
#endif
/* Pickup the number of suspended threads. */
suspended_count = (pool_ptr -> tx_block_pool_suspended_count);
/* Increment the number of suspended threads. */
(pool_ptr -> tx_block_pool_suspended_count)++;
/* Setup suspension list. */
if (suspended_count == TX_NO_SUSPENSIONS)
{
/* No other threads are suspended. Setup the head pointer and
just setup this threads pointers to itself. */
pool_ptr -> tx_block_pool_suspension_list = thread_ptr;
thread_ptr -> tx_thread_suspended_next = thread_ptr;
thread_ptr -> tx_thread_suspended_previous = thread_ptr;
}
else
{
/* This list is not NULL, add current thread to the end. */
next_thread = pool_ptr -> tx_block_pool_suspension_list;
thread_ptr -> tx_thread_suspended_next = next_thread;
previous_thread = next_thread -> tx_thread_suspended_previous;
thread_ptr -> tx_thread_suspended_previous = previous_thread;
previous_thread -> tx_thread_suspended_next = thread_ptr;
next_thread -> tx_thread_suspended_previous = thread_ptr;
}
/* Set the state to suspended. */
thread_ptr -> tx_thread_state = TX_BLOCK_MEMORY;
#ifdef TX_NOT_INTERRUPTABLE
/* Call actual non-interruptable thread suspension routine. */
_tx_thread_system_ni_suspend(thread_ptr, wait_option);
/* Restore interrupts. */
TX_RESTORE
#else
/* Set the suspending flag. */
thread_ptr -> tx_thread_suspending = TX_TRUE;
/* Setup the timeout period. */
thread_ptr -> tx_thread_timer.tx_timer_internal_remaining_ticks = wait_option;
/* Temporarily disable preemption. */
_tx_thread_preempt_disable++;
/* Restore interrupts. */
TX_RESTORE
/* Call actual thread suspension routine. */
_tx_thread_system_suspend(thread_ptr);
#endif
#ifdef TX_ENABLE_EVENT_TRACE
/* Check that the event time stamp is unchanged. A different
timestamp means that a later event wrote over the byte
allocate event. In that case, do nothing here. */
if (entry_ptr != TX_NULL)
{
/* Is the time-stamp the same? */
if (time_stamp == entry_ptr -> tx_trace_buffer_entry_time_stamp)
{
/* Timestamp is the same, update the entry with the address. */
#ifdef TX_MISRA_ENABLE
entry_ptr -> tx_trace_buffer_entry_info_2 = TX_POINTER_TO_ULONG_CONVERT(*block_ptr);
#else
entry_ptr -> tx_trace_buffer_entry_information_field_2 = TX_POINTER_TO_ULONG_CONVERT(*block_ptr);
#endif
}
}
#endif
#ifdef TX_ENABLE_EVENT_LOGGING
/* Check that the event time stamp is unchanged and the call is about
to return success. A different timestamp means that a later event
wrote over the block allocate event. A return value other than
TX_SUCCESS indicates that no block was available. In those cases,
do nothing here. */
if (lower_tbu == *((ULONG *) (log_entry_ptr + TX_EL_EVENT_TIME_LOWER_OFFSET)) &&
upper_tbu == *((ULONG *) (log_entry_ptr + TX_EL_EVENT_TIME_UPPER_OFFSET)) &&
((thread_ptr -> tx_thread_suspend_status) == TX_SUCCESS))
{
/* Store the address of the allocated block. */
*((ULONG *) (log_entry_ptr + TX_EL_EVENT_INFO_3_OFFSET)) = (ULONG) *block_ptr;
}
#endif
/* Return the completion status. */
status = thread_ptr -> tx_thread_suspend_status;
}
}
else
{
/* Immediate return, return error completion. */
status = TX_NO_MEMORY;
/* Restore interrupts. */
TX_RESTORE
}
}
/* Return completion status. */
return(status);
}
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