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_getvalue PORTABLE C */
35 /* 6.1.7 */
36 /* AUTHOR */
37 /* */
38 /* William E. Lamie, Microsoft Corporation */
39 /* */
40 /* DESCRIPTION */
41 /* */
42 /* This routine updates the location referenced by the sval argument */
43 /* to have the value of the semaphore referenced by sem without */
44 /* affecting the state of the semaphore */
45 /* */
46 /* INPUT */
47 /* */
48 /* *sem pointer to Semaphore. */
49 /* *sval Buffer by which the value is returned. */
50 /* */
51 /* OUTPUT */
52 /* */
53 /* OK If successful */
54 /* ERROR IF fails */
55 /* */
56 /* CALLS */
57 /* */
58 /* None */
59 /* */
60 /* CALLED BY */
61 /* */
62 /* Application 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_getvalue(sem_t * sem,ULONG * sval)71 INT sem_getvalue(sem_t * sem,ULONG * sval)
72 {
73
74 TX_INTERRUPT_SAVE_AREA
75
76 TX_SEMAPHORE *TheSem;
77
78 /* get ThreadX semaphore. */
79 TheSem = (TX_SEMAPHORE *)sem;
80
81 /* First, check for an invalid semaphore pointer. */
82 if ((!TheSem) || (TheSem -> tx_semaphore_id != TX_SEMAPHORE_ID))
83 {
84 /* Return appropriate error. */
85 posix_errno=EINVAL;
86 posix_set_pthread_errno(EINVAL);
87 /* Return Error. */
88 return(EINVAL);
89 }
90
91 /* Disable interrupts. */
92 TX_DISABLE
93
94 * sval = TheSem ->tx_semaphore_count;
95
96 /* Restore Interrupts. */
97 TX_RESTORE
98
99 return(OK);
100 }
101
