diff options
Diffstat (limited to 'ports/linux/gnu/src/tx_thread_context_save.c')
| -rw-r--r-- | ports/linux/gnu/src/tx_thread_context_save.c | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/ports/linux/gnu/src/tx_thread_context_save.c b/ports/linux/gnu/src/tx_thread_context_save.c new file mode 100644 index 00000000..90ff05f1 --- /dev/null +++ b/ports/linux/gnu/src/tx_thread_context_save.c @@ -0,0 +1,107 @@ +/**************************************************************************/ +/* */ +/* 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" +#include "tx_timer.h" + + +/**************************************************************************/ +/* */ +/* FUNCTION RELEASE */ +/* */ +/* _tx_thread_context_save Linux/GNU */ +/* 6.0 */ +/* AUTHOR */ +/* */ +/* William E. Lamie, Microsoft Corporation */ +/* */ +/* DESCRIPTION */ +/* */ +/* This function saves the context of an executing thread in the */ +/* beginning of interrupt processing. The function also ensures that */ +/* the system stack is used upon return to the calling ISR. */ +/* */ +/* INPUT */ +/* */ +/* None */ +/* */ +/* OUTPUT */ +/* */ +/* None */ +/* */ +/* CALLS */ +/* */ +/* _tx_linux_debug_entry_insert */ +/* tx_linux_mutex_lock */ +/* _tx_linux_thread_suspend */ +/* tx_linux_mutex_unlock */ +/* */ +/* CALLED BY */ +/* */ +/* ISRs */ +/* */ +/* RELEASE HISTORY */ +/* */ +/* DATE NAME DESCRIPTION */ +/* */ +/* 05-19-2020 William E. Lamie Initial Version 6.0 */ +/* */ +/**************************************************************************/ +VOID _tx_thread_context_save(VOID) +{ + + /* Debug entry. */ + _tx_linux_debug_entry_insert("CONTEXT_SAVE", __FILE__, __LINE__); + + /* Lock mutex to ensure other threads are not playing with + the core ThreadX data structures. */ + tx_linux_mutex_lock(_tx_linux_mutex); + + /* If an application thread is running, suspend it to simulate preemption. */ + if ((_tx_thread_current_ptr) && (_tx_thread_system_state == 0)) + { + + /* Debug entry. */ + _tx_linux_debug_entry_insert("CONTEXT_SAVE-suspend_thread", __FILE__, __LINE__); + + /* Yes, this is the first interrupt and an application thread is running... + suspend it! */ + _tx_linux_thread_suspend(_tx_thread_current_ptr -> tx_thread_linux_thread_id); + + /* Indicate that this thread was suspended asynchronously. */ + _tx_thread_current_ptr -> tx_thread_linux_suspension_type = 1; + } + + /* Increment the nested interrupt condition. */ + _tx_thread_system_state++; + + /* Unlock linux mutex. */ + tx_linux_mutex_unlock(_tx_linux_mutex); +} + |