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 /* sem_getvalue PORTABLE C */
34 /* 6.1.7 */
35 /* AUTHOR */
36 /* */
37 /* William E. Lamie, Microsoft Corporation */
38 /* */
39 /* DESCRIPTION */
40 /* */
41 /* This routine updates the location referenced by the sval argument */
42 /* to have the value of the semaphore referenced by sem without */
43 /* affecting the state of the semaphore */
44 /* */
45 /* INPUT */
46 /* */
47 /* *sem pointer to Semaphore. */
48 /* *sval Buffer by which the value is returned. */
49 /* */
50 /* OUTPUT */
51 /* */
52 /* OK If successful */
53 /* ERROR IF fails */
54 /* */
55 /* CALLS */
56 /* */
57 /* None */
58 /* */
59 /* CALLED BY */
60 /* */
61 /* Application Code */
62 /* */
63 /* RELEASE HISTORY */
64 /* */
65 /* DATE NAME DESCRIPTION */
66 /* */
67 /* 06-02-2021 William E. Lamie Initial Version 6.1.7 */
68 /* */
69 /**************************************************************************/
sem_getvalue(sem_t * sem,ULONG * sval)70 INT sem_getvalue(sem_t * sem,ULONG * sval)
71 {
72
73 TX_INTERRUPT_SAVE_AREA
74
75 TX_SEMAPHORE *TheSem;
76
77 /* get ThreadX semaphore. */
78 TheSem = (TX_SEMAPHORE *)sem;
79
80 /* First, check for an invalid semaphore pointer. */
81 if ((!TheSem) || (TheSem -> tx_semaphore_id != TX_SEMAPHORE_ID))
82 {
83 /* Return appropriate error. */
84 posix_errno=EINVAL;
85 posix_set_pthread_errno(EINVAL);
86 /* Return Error. */
87 return(EINVAL);
88 }
89
90 /* Disable interrupts. */
91 TX_DISABLE
92
93 * sval = TheSem ->tx_semaphore_count;
94
95 /* Restore Interrupts. */
96 TX_RESTORE
97
98 return(OK);
99 }
100
