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Diffstat (limited to 'common/src/tx_timer_system_deactivate.c')
| -rw-r--r-- | common/src/tx_timer_system_deactivate.c | 132 |
1 files changed, 132 insertions, 0 deletions
diff --git a/common/src/tx_timer_system_deactivate.c b/common/src/tx_timer_system_deactivate.c new file mode 100644 index 00000000..b951791f --- /dev/null +++ b/common/src/tx_timer_system_deactivate.c @@ -0,0 +1,132 @@ +/**************************************************************************/ +/* */ +/* 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 */ +/** */ +/** Timer */ +/** */ +/**************************************************************************/ +/**************************************************************************/ + +#define TX_SOURCE_CODE + + +/* Include necessary system files. */ + +#include "tx_api.h" +#include "tx_timer.h" + + +/**************************************************************************/ +/* */ +/* FUNCTION RELEASE */ +/* */ +/* _tx_timer_system_deactivate PORTABLE C */ +/* 6.0 */ +/* AUTHOR */ +/* */ +/* William E. Lamie, Microsoft Corporation */ +/* */ +/* DESCRIPTION */ +/* */ +/* This function deactivates, or removes the timer from the active */ +/* timer expiration list. If the timer is already deactivated, this */ +/* function just returns. */ +/* */ +/* INPUT */ +/* */ +/* timer_ptr Pointer to timer control block */ +/* */ +/* OUTPUT */ +/* */ +/* TX_SUCCESS Always returns success */ +/* */ +/* CALLS */ +/* */ +/* None */ +/* */ +/* CALLED BY */ +/* */ +/* _tx_thread_system_resume Thread resume function */ +/* _tx_timer_thread_entry Timer thread processing */ +/* */ +/* RELEASE HISTORY */ +/* */ +/* DATE NAME DESCRIPTION */ +/* */ +/* 05-19-2020 William E. Lamie Initial Version 6.0 */ +/* */ +/**************************************************************************/ +VOID _tx_timer_system_deactivate(TX_TIMER_INTERNAL *timer_ptr) +{ + +TX_TIMER_INTERNAL **list_head; +TX_TIMER_INTERNAL *next_timer; +TX_TIMER_INTERNAL *previous_timer; + + + /* Pickup the list head pointer. */ + list_head = timer_ptr -> tx_timer_internal_list_head; + + /* Determine if the timer still needs deactivation. */ + if (list_head != TX_NULL) + { + + /* Deactivate the timer. */ + + /* Pickup the next active timer. */ + next_timer = timer_ptr -> tx_timer_internal_active_next; + + /* See if this is the only timer in the list. */ + if (timer_ptr == next_timer) + { + + /* Yes, the only timer on the list. */ + + /* Determine if the head pointer needs to be updated. */ + if (*(list_head) == timer_ptr) + { + + /* Update the head pointer. */ + *(list_head) = TX_NULL; + } + } + else + { + + /* At least one more timer is on the same expiration list. */ + + /* Update the links of the adjacent timers. */ + previous_timer = timer_ptr -> tx_timer_internal_active_previous; + next_timer -> tx_timer_internal_active_previous = previous_timer; + previous_timer -> tx_timer_internal_active_next = next_timer; + + /* Determine if the head pointer needs to be updated. */ + if (*(list_head) == timer_ptr) + { + + /* Update the next timer in the list with the list head pointer. */ + next_timer -> tx_timer_internal_list_head = list_head; + + /* Update the head pointer. */ + *(list_head) = next_timer; + } + } + + /* Clear the timer's list head pointer. */ + timer_ptr -> tx_timer_internal_list_head = TX_NULL; + } +} + |