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 "tx_posix.h" /* Posix API */
28 #include "px_int.h" /* Posix helper functions */
29
30
31 /**************************************************************************/
32 /* */
33 /* FUNCTION RELEASE */
34 /* */
35 /* sem_init PORTABLE C */
36 /* 6.1.7 */
37 /* AUTHOR */
38 /* */
39 /* William E. Lamie, Microsoft Corporation */
40 /* */
41 /* DESCRIPTION */
42 /* */
43 /* This function initializes a nameless sempaphore. */
44 /* */
45 /* INPUT */
46 /* */
47 /* sem Semaphore pointer */
48 /* pshared Shared semphore (TRUE/FALSE) */
49 /* value Initial value */
50 /* */
51 /* OUTPUT */
52 /* */
53 /* EINVAL if error occurs */
54 /* NO_ERROR successful */
55 /* */
56 /* CALLS */
57 /* */
58 /* tx_semaphore_create creates 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_init(sem_t * sem,INT pshared,UINT value)71 INT sem_init(sem_t *sem , INT pshared, UINT value)
72 {
73 INT result;
74
75 if((sem==NULL)||(value > SEM_VALUE_MAX)||(sem->in_use==TX_TRUE))
76 {
77 result = EINVAL; /* general error */
78
79 }
80 else
81 {
82 if(tx_semaphore_create(&(sem->sem),"",value)) result = EINVAL;
83 else
84 { /* initialize semaphore fields */
85 sem->count = 0;
86 sem->in_use = TX_TRUE;
87 sem->psemId = 0;
88 sem->refCnt = value;
89 sem->sem_name = "";
90 sem->unlink_flag =TX_FALSE;
91
92 result = NO_ERROR;
93 }
94 }
95
96
97 return result;
98 }
99
