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 /*    pthread_mutex_unlock                                PORTABLE C      */
35 /*                                                           6.1.7        */
36 /*  AUTHOR                                                                */
37 /*                                                                        */
38 /*    William E. Lamie, Microsoft Corporation                             */
39 /*                                                                        */
40 /*  DESCRIPTION                                                           */
41 /*                                                                        */
42 /*    This function shall release the mutex object referenced by mutex.   */
43 /*    The manner in which a mutex is released is dependent upon the mutex */
44 /*    type attribute. If there are threads blocked on the mutex object    */
45 /*    referenced by mutex when pthread_mutex_unlock() is called,resulting */
46 /*    in the mutex becoming available,the scheduling policy shall         */
47 /*    determine which thread shall acquire the mutex.                     */
48 /*                                                                        */
49 /*  INPUT                                                                 */
50 /*                                                                        */
51 /*    mutex                          Address of the mutex                 */
52 /*                                                                        */
53 /*  OUTPUT                                                                */
54 /*                                                                        */
55 /*     0                             if successful                        */
56 /*     Value                         in case of any error                 */
57 /*                                                                        */
58 /*  CALLS                                                                 */
59 /*                                                                        */
60 /*    tx_mutex_put                   ThreadX Mutex service                */
61 /*                                                                        */
62 /*  CALLED BY                                                             */
63 /*                                                                        */
64 /*    Application Code                                                    */
65 /*                                                                        */
66 /*  RELEASE HISTORY                                                       */
67 /*                                                                        */
68 /*    DATE              NAME                      DESCRIPTION             */
69 /*                                                                        */
70 /*  06-02-2021     William E. Lamie         Initial Version 6.1.7         */
71 /*                                                                        */
72 /**************************************************************************/
pthread_mutex_unlock(pthread_mutex_t * mutex)73 INT pthread_mutex_unlock(pthread_mutex_t *mutex )
74 {
75 
76 TX_MUTEX        *mutex_ptr;
77 INT              retval,status;
78 
79 
80     /* convert pthread mutex object to ThreadX mutex  */
81     mutex_ptr = (TX_MUTEX*)mutex;
82     status = tx_mutex_put( mutex_ptr);
83     switch ( status)
84     {
85         case TX_SUCCESS:
86             retval = OK;
87             break;
88 
89         case TX_MUTEX_ERROR:
90             posix_errno  = EINVAL;
91 	        posix_set_pthread_errno(EINVAL);
92             retval = EINVAL;
93             break;
94 
95         case TX_NOT_OWNED:
96             posix_errno  = EPERM;
97 	        posix_set_pthread_errno(EPERM);
98 	    retval = EPERM;
99             break;
100 
101         default:
102             posix_errno  = EINVAL;
103 	        posix_set_pthread_errno(EINVAL);
104             retval = EINVAL;
105             break;
106     }
107     return (retval);
108 }
109