summaryrefslogtreecommitdiff
path: root/modules/tclsci/src/c/GlobalTclInterp.c
blob: 1440cce20fcbf4a590a15f7ca7f6785a0d420c67 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
/*
 * Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
 * Copyright (C) 2008-2008 - INRIA - Bruno JOFRET
 *
 * This file must be used under the terms of the CeCILL.
 * This source file is licensed as described in the file COPYING, which
 * you should have received as part of this distribution.  The terms
 * are also available at
 * http://www.cecill.info/licences/Licence_CeCILL_V2.1-en.txt
 *
 */

/**
 ** This is to provide a global Tcl interpreter
 ** with Locking system in order it does not have any
 ** concurrential access
 **/

#include "GlobalTclInterp.h"
#include "Thread_Wrapper.h"

Tcl_Interp	*__globalTclInterp = NULL;
__threadLock	singleInterpAccess;

static int initialized = 0;

/*
** Initialize the global interpreter.
*/
void initTclInterp(void)
{
    __InitLock(&singleInterpAccess);
    __Lock(&singleInterpAccess);
    __globalTclInterp = Tcl_CreateInterp();
    __UnLock(&singleInterpAccess);

    /* indicate that we have in fact initialized our mutex */
    initialized = 1;
}

/*
** Delete the global interpreter.
*/
void deleteTclInterp(void)
{
    __globalTclInterp = NULL;

}

/*
** Get the Global Interpreter
*/
Tcl_Interp *getTclInterp(void)
{
    if (! initialized )
    {
        return NULL;
    }
    __Lock(&singleInterpAccess);
    return __globalTclInterp;
}

/*
** Release Tcl Interp after use.
*/
void releaseTclInterp(void)
{
    /* only try to unlock if we have already initialized our threading system */
    if ( initialized )
    {
        __UnLock(&singleInterpAccess);
    }
}

/*
** Check if global interp exists.
*/
BOOL existsGlobalInterp(void)
{
    if (__globalTclInterp != NULL)
    {
        return TRUE;
    }
    return FALSE;
}
/*
** Check if slave interp exists.
*/
BOOL existsSlaveInterp(char *name)
{
    if (Tcl_GetSlave(getTclInterp(), name) != NULL)
    {
        releaseTclInterp();
        return TRUE;
    }
    releaseTclInterp();
    return FALSE;
}

/*
** WARNING
** Get the Global Interpreter
** without any lock
** should not be used ouside of the main
** TCL loop (the one containing update)
*/
Tcl_Interp *requestTclInterp(void)
{
    return __globalTclInterp;
}