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 "tx_posix.h" /* Posix API */
27 #include "px_int.h" /* Posix helper functions */
28
29
30 /**************************************************************************/
31 /* */
32 /* FUNCTION RELEASE */
33 /* */
34 /* sem_init PORTABLE C */
35 /* 6.1.7 */
36 /* AUTHOR */
37 /* */
38 /* William E. Lamie, Microsoft Corporation */
39 /* */
40 /* DESCRIPTION */
41 /* */
42 /* This function initializes a nameless sempaphore. */
43 /* */
44 /* INPUT */
45 /* */
46 /* sem Semaphore pointer */
47 /* pshared Shared semphore (TRUE/FALSE) */
48 /* value Initial value */
49 /* */
50 /* OUTPUT */
51 /* */
52 /* EINVAL if error occurs */
53 /* NO_ERROR successful */
54 /* */
55 /* CALLS */
56 /* */
57 /* tx_semaphore_create creates actual THreadx semaphore */
58 /* */
59 /* CALLED BY */
60 /* */
61 /* POSIX internal 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_init(sem_t * sem,INT pshared,UINT value)70 INT sem_init(sem_t *sem , INT pshared, UINT value)
71 {
72 INT result;
73
74 if((sem==NULL)||(value > SEM_VALUE_MAX)||(sem->in_use==TX_TRUE))
75 {
76 result = EINVAL; /* general error */
77
78 }
79 else
80 {
81 if(tx_semaphore_create(&(sem->sem),"",value)) result = EINVAL;
82 else
83 { /* initialize semaphore fields */
84 sem->count = 0;
85 sem->in_use = TX_TRUE;
86 sem->psemId = 0;
87 sem->refCnt = value;
88 sem->sem_name = "";
89 sem->unlink_flag =TX_FALSE;
90
91 result = NO_ERROR;
92 }
93 }
94
95
96 return result;
97 }
98
