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 /* sem_destroy PORTABLE C */
35 /* 6.1.7 */
36 /* AUTHOR */
37 /* */
38 /* William E. Lamie, Microsoft Corporation */
39 /* */
40 /* DESCRIPTION */
41 /* */
42 /* This function destroys a nameless semphore */
43 /* Waiting threads will be rescheduled */
44 /* No memory will be released */
45 /* */
46 /* INPUT */
47 /* */
48 /* sem Semaphore pointer */
49 /* */
50 /* OUTPUT */
51 /* */
52 /* EINVAL if error occurs */
53 /* EBUSY if threads were waiting */
54 /* NO_ERROR successful */
55 /* */
56 /* CALLS */
57 /* */
58 /* tx_semaphore_delete deletes actual THreadx semaphore */
59 /* */
60 /* CALLED BY */
61 /* */
62 /* POSIX internal Code */
63 /* */
64 /* RELEASE HISTORY */
65 /* */
66 /* DATE NAME DESCRIPTION */
67 /* */
68 /* 06-02-2021 William E. Lamie Initial Version 6.1.7 */
69 /* */
70 /**************************************************************************/
sem_destroy(sem_t * sem)71 INT sem_destroy(sem_t *sem)
72 {
73 INT result;
74
75 if((sem==NULL)|| ( sem->in_use == TX_FALSE))
76 {
77 result = EINVAL; /* general error */
78
79 }
80 else
81 {
82 if(sem->sem.tx_semaphore_suspended_count > 0 ) result = EBUSY;
83 else result = NO_ERROR;
84 tx_semaphore_delete(&(sem->sem));
85 sem->in_use = TX_FALSE;
86 }
87
88
89 return result;
90 }
91
