1 /**************************************************************************/
2 /* */
3 /* Copyright (c) Microsoft Corporation. All rights reserved. */
4 /* */
5 /* This software is licensed under the Microsoft Software License */
6 /* Terms for Microsoft Azure RTOS. Full text of the license can be */
7 /* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */
8 /* and in the root directory of this software. */
9 /* */
10 /**************************************************************************/
11
12
13 /**************************************************************************/
14 /**************************************************************************/
15 /** */
16 /** POSIX wrapper for THREADX */
17 /** */
18 /** */
19 /** */
20 /**************************************************************************/
21 /**************************************************************************/
22
23 /* Include necessary system files. */
24
25 #include "tx_api.h" /* Threadx API */
26 #include "pthread.h" /* Posix API */
27 #include "px_int.h" /* Posix helper functions */
28
29
30 /**************************************************************************/
31 /* */
32 /* FUNCTION RELEASE */
33 /* */
34 /* posix_in_thread_context PORTABLE C */
35 /* 6.1.7 */
36 /* AUTHOR */
37 /* */
38 /* William E. Lamie, Microsoft Corporation */
39 /* */
40 /* DESCRIPTION */
41 /* */
42 /* This function determines if the system is currently in "thread" */
43 /* context, i.e. not timer routine, not ISR, not idling. */
44 /* */
45 /* INPUT */
46 /* */
47 /* None */
48 /* */
49 /* OUTPUT */
50 /* */
51 /* TX_TRUE | TX_FALSE */
52 /* */
53 /* CALLS */
54 /* */
55 /* None */
56 /* */
57 /* CALLED BY */
58 /* */
59 /* posix internal code */
60 /* */
61 /* RELEASE HISTORY */
62 /* */
63 /* DATE NAME DESCRIPTION */
64 /* */
65 /* 06-02-2021 William E. Lamie Initial Version 6.1.7 */
66 /* */
67 /**************************************************************************/
posix_in_thread_context(VOID)68 ULONG posix_in_thread_context(VOID)
69 {
70 /* External variables, defined within ThreadX, needed here. */
71 extern TX_THREAD * _tx_thread_current_ptr;
72 extern ULONG _tx_thread_system_state;
73 #ifndef TX_TIMER_PROCESS_IN_ISR
74 extern TX_THREAD _tx_timer_thread;
75 #endif
76
77 /* Return TX_FALSE if any of the following are true:
78 - we are in the scheduling loop (not in a thread);
79 - we are in an ISR
80 - we are in a timer routine
81 Return TX_TRUE otherwise (we are in a thread.)
82 */
83
84 if (_tx_thread_system_state == TX_INITIALIZE_IN_PROGRESS)
85 {
86
87 /* We are calling from initialization, return TRUE. */
88 return(TX_TRUE);
89 }
90 else if ((!_tx_thread_current_ptr) /* Not in a thread */
91 || (_tx_thread_system_state) /* In an ISR */
92 #ifndef TX_TIMER_PROCESS_IN_ISR
93 /* Timer routine */
94 || (_tx_thread_current_ptr == &_tx_timer_thread)
95 #endif
96 )
97
98 {
99 /* We are NOT in thread (thread) context. */
100 return (TX_FALSE);
101 }
102 else
103 {
104 /* We ARE in thread (thread) context. */
105 return (TX_TRUE);
106 }
107 }
108
