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 /** GUIX Component                                                        */
16 /**                                                                       */
17 /**   System Management (System)                                          */
18 /**                                                                       */
19 /**************************************************************************/
20 
21 #define GX_SOURCE_CODE
22 
23 
24 /* Include necessary system files.  */
25 
26 #include "gx_api.h"
27 #include "gx_system.h"
28 
29 
30 /**************************************************************************/
31 /*                                                                        */
32 /*  FUNCTION                                               RELEASE        */
33 /*                                                                        */
34 /*    _gx_system_unlock                                   PORTABLE C      */
35 /*                                                           6.1          */
36 /*  AUTHOR                                                                */
37 /*                                                                        */
38 /*    Kenneth Maxwell, Microsoft Corporation                              */
39 /*                                                                        */
40 /*  DESCRIPTION                                                           */
41 /*                                                                        */
42 /*    This function unlocks the GUIX system mutex                         */
43 /*                                                                        */
44 /*  INPUT                                                                 */
45 /*                                                                        */
46 /*    None                                                                */
47 /*                                                                        */
48 /*  OUTPUT                                                                */
49 /*                                                                        */
50 /*    None                                                                */
51 /*                                                                        */
52 /*  CALLS                                                                 */
53 /*                                                                        */
54 /*    tx_mutex_put                          Release the mutex             */
55 /*     _gx_system_error_process             Process system error          */
56 /*                                                                        */
57 /*  CALLED BY                                                             */
58 /*                                                                        */
59 /*    GUIX Internal Code                                                  */
60 /*                                                                        */
61 /*  RELEASE HISTORY                                                       */
62 /*                                                                        */
63 /*    DATE              NAME                      DESCRIPTION             */
64 /*                                                                        */
65 /*  05-19-2020     Kenneth Maxwell          Initial Version 6.0           */
66 /*  09-30-2020     Kenneth Maxwell          Modified comment(s),          */
67 /*                                            resulting in version 6.1    */
68 /*                                                                        */
69 /**************************************************************************/
_gx_system_unlock(VOID)70 VOID  _gx_system_unlock(VOID)
71 {
72 #ifdef GX_THREADX_BINDING
73 UINT protection_status;
74 #endif
75 
76     if (_gx_system_lock_nesting > 0)
77     {
78         _gx_system_lock_nesting--;
79 
80         if (_gx_system_lock_nesting == 0)
81         {
82             /* no thread has GUIX locked */
83             _gx_system_lock_thread = GX_NULL;
84 
85             /* Release the protection prior to blocking on the event queue.  */
86 
87 #ifdef GX_THREADX_BINDING
88             protection_status =  tx_mutex_put(&_gx_system_protect);
89             /* Determine if the protection was successfully released.  */
90             if (protection_status)
91             {
92 
93                 /* Error releasing protection - call system error handler.  */
94                 _gx_system_error_process(GX_SYSTEM_PROTECTION_ERROR);
95 
96                 /* Return to exit the system thread.  */
97                 return;
98             }
99 #else
100             GX_SYSTEM_MUTEX_UNLOCK;
101 #endif
102         }
103     }
104 }
105 
106