1 /***************************************************************************
2 * Copyright (c) 2024 Microsoft Corporation
3 *
4 * This program and the accompanying materials are made available under the
5 * terms of the MIT License which is available at
6 * https://opensource.org/licenses/MIT.
7 *
8 * SPDX-License-Identifier: MIT
9 **************************************************************************/
10
11
12 /**************************************************************************/
13 /**************************************************************************/
14 /** */
15 /** POSIX wrapper for THREADX */
16 /** */
17 /** */
18 /** */
19 /**************************************************************************/
20 /**************************************************************************/
21
22 /* Include necessary system files. */
23
24 #include "tx_api.h" /* Threadx API */
25 #include "pthread.h" /* Posix API */
26 #include "px_int.h" /* Posix helper functions */
27
28
29 /**************************************************************************/
30 /* */
31 /* FUNCTION RELEASE */
32 /* */
33 /* posix_in_thread_context PORTABLE C */
34 /* 6.1.7 */
35 /* AUTHOR */
36 /* */
37 /* William E. Lamie, Microsoft Corporation */
38 /* */
39 /* DESCRIPTION */
40 /* */
41 /* This function determines if the system is currently in "thread" */
42 /* context, i.e. not timer routine, not ISR, not idling. */
43 /* */
44 /* INPUT */
45 /* */
46 /* None */
47 /* */
48 /* OUTPUT */
49 /* */
50 /* TX_TRUE | TX_FALSE */
51 /* */
52 /* CALLS */
53 /* */
54 /* None */
55 /* */
56 /* CALLED BY */
57 /* */
58 /* posix internal code */
59 /* */
60 /* RELEASE HISTORY */
61 /* */
62 /* DATE NAME DESCRIPTION */
63 /* */
64 /* 06-02-2021 William E. Lamie Initial Version 6.1.7 */
65 /* */
66 /**************************************************************************/
posix_in_thread_context(VOID)67 ULONG posix_in_thread_context(VOID)
68 {
69 /* External variables, defined within ThreadX, needed here. */
70 extern TX_THREAD * _tx_thread_current_ptr;
71 extern ULONG _tx_thread_system_state;
72 #ifndef TX_TIMER_PROCESS_IN_ISR
73 extern TX_THREAD _tx_timer_thread;
74 #endif
75
76 /* Return TX_FALSE if any of the following are true:
77 - we are in the scheduling loop (not in a thread);
78 - we are in an ISR
79 - we are in a timer routine
80 Return TX_TRUE otherwise (we are in a thread.)
81 */
82
83 if (_tx_thread_system_state == TX_INITIALIZE_IN_PROGRESS)
84 {
85
86 /* We are calling from initialization, return TRUE. */
87 return(TX_TRUE);
88 }
89 else if ((!_tx_thread_current_ptr) /* Not in a thread */
90 || (_tx_thread_system_state) /* In an ISR */
91 #ifndef TX_TIMER_PROCESS_IN_ISR
92 /* Timer routine */
93 || (_tx_thread_current_ptr == &_tx_timer_thread)
94 #endif
95 )
96
97 {
98 /* We are NOT in thread (thread) context. */
99 return (TX_FALSE);
100 }
101 else
102 {
103 /* We ARE in thread (thread) context. */
104 return (TX_TRUE);
105 }
106 }
107
