diff options
| author | PProvost <[email protected]> | 2020-05-11 08:55:07 -0600 |
|---|---|---|
| committer | PProvost <[email protected]> | 2020-05-11 08:55:07 -0600 |
| commit | 852421fda03a7722d7adb45b187235cd66fa264e (patch) | |
| tree | b117e1339a047347a3d7ebf3eeb1891168cc9b9b /common/src/tx_thread_system_preempt_check.c | |
Initial commit
Diffstat (limited to 'common/src/tx_thread_system_preempt_check.c')
| -rw-r--r-- | common/src/tx_thread_system_preempt_check.c | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/common/src/tx_thread_system_preempt_check.c b/common/src/tx_thread_system_preempt_check.c new file mode 100644 index 00000000..0b92bb8b --- /dev/null +++ b/common/src/tx_thread_system_preempt_check.c @@ -0,0 +1,127 @@ +/**************************************************************************/ +/* */ +/* 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 */ +/** */ +/** Thread */ +/** */ +/**************************************************************************/ +/**************************************************************************/ + +#define TX_SOURCE_CODE + + +/* Include necessary system files. */ + +#include "tx_api.h" +#include "tx_thread.h" + + +/**************************************************************************/ +/* */ +/* FUNCTION RELEASE */ +/* */ +/* _tx_thread_system_preempt_check PORTABLE C */ +/* 6.0 */ +/* AUTHOR */ +/* */ +/* William E. Lamie, Microsoft Corporation */ +/* */ +/* DESCRIPTION */ +/* */ +/* This function checks for preemption that could have occurred as a */ +/* result scheduling activities occurring while the preempt disable */ +/* flag was set. */ +/* */ +/* INPUT */ +/* */ +/* None */ +/* */ +/* OUTPUT */ +/* */ +/* None */ +/* */ +/* CALLS */ +/* */ +/* _tx_thread_system_return Return to the system */ +/* */ +/* CALLED BY */ +/* */ +/* Other ThreadX Components */ +/* */ +/* RELEASE HISTORY */ +/* */ +/* DATE NAME DESCRIPTION */ +/* */ +/* 05-19-2020 William E. Lamie Initial Version 6.0 */ +/* */ +/**************************************************************************/ +VOID _tx_thread_system_preempt_check(VOID) +{ + +ULONG combined_flags; +TX_THREAD *current_thread; +TX_THREAD *thread_ptr; + + + /* Combine the system state and preempt disable flags into one for comparison. */ + TX_THREAD_SYSTEM_RETURN_CHECK(combined_flags) + + /* Determine if we are in a system state (ISR or Initialization) or internal preemption is disabled. */ + if (combined_flags == ((ULONG) 0)) + { + + /* No, at thread execution level so continue checking for preemption. */ + + /* Pickup thread pointer. */ + TX_THREAD_GET_CURRENT(current_thread) + + /* Pickup the next execute pointer. */ + thread_ptr = _tx_thread_execute_ptr; + + /* Determine if preemption should take place. */ + if (current_thread != thread_ptr) + { + +#ifdef TX_ENABLE_STACK_CHECKING + + /* Check this thread's stack. */ + TX_THREAD_STACK_CHECK(thread_ptr) +#endif + + +#ifdef TX_THREAD_ENABLE_PERFORMANCE_INFO + + /* Determine if an idle system return is present. */ + if (thread_ptr == TX_NULL) + { + + /* Yes, increment the return to idle return count. */ + _tx_thread_performance_idle_return_count++; + } + else + { + + /* No, there is another thread ready to run and will be scheduled upon return. */ + _tx_thread_performance_non_idle_return_count++; + } +#endif + + /* Return to the system so the higher priority thread can be scheduled. */ + _tx_thread_system_return(); + } + } +} + |