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1 /* glpenv02.c (thread local storage) */ |
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2 |
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3 /*********************************************************************** |
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4 * This code is part of GLPK (GNU Linear Programming Kit). |
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5 * |
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6 * Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, |
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7 * 2009, 2010 Andrew Makhorin, Department for Applied Informatics, |
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8 * Moscow Aviation Institute, Moscow, Russia. All rights reserved. |
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9 * E-mail: <mao@gnu.org>. |
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10 * |
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11 * GLPK is free software: you can redistribute it and/or modify it |
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12 * under the terms of the GNU General Public License as published by |
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13 * the Free Software Foundation, either version 3 of the License, or |
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14 * (at your option) any later version. |
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15 * |
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16 * GLPK is distributed in the hope that it will be useful, but WITHOUT |
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17 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
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18 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public |
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19 * License for more details. |
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20 * |
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21 * You should have received a copy of the GNU General Public License |
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22 * along with GLPK. If not, see <http://www.gnu.org/licenses/>. |
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23 ***********************************************************************/ |
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24 |
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25 #include "glpenv.h" |
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26 |
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27 static void *tls = NULL; |
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28 /* in a re-entrant version of the package this variable must be placed |
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29 in the Thread Local Storage (TLS) */ |
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30 |
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31 /*********************************************************************** |
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32 * NAME |
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33 * |
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34 * tls_set_ptr - store global pointer in TLS |
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35 * |
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36 * SYNOPSIS |
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37 * |
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38 * #include "glpenv.h" |
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39 * void tls_set_ptr(void *ptr); |
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40 * |
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41 * DESCRIPTION |
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42 * |
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43 * The routine tls_set_ptr stores a pointer specified by the parameter |
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44 * ptr in the Thread Local Storage (TLS). */ |
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45 |
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46 void tls_set_ptr(void *ptr) |
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47 { tls = ptr; |
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48 return; |
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49 } |
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50 |
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51 /*********************************************************************** |
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52 * NAME |
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53 * |
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54 * tls_get_ptr - retrieve global pointer from TLS |
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55 * |
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56 * SYNOPSIS |
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57 * |
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58 * #include "glpenv.h" |
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59 * void *tls_get_ptr(void); |
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60 * |
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61 * RETURNS |
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62 * |
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63 * The routine tls_get_ptr returns a pointer previously stored by the |
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64 * routine tls_set_ptr. If the latter has not been called yet, NULL is |
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65 * returned. */ |
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66 |
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67 void *tls_get_ptr(void) |
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68 { void *ptr; |
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69 ptr = tls; |
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70 return ptr; |
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71 } |
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72 |
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73 /* eof */ |