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1 /* ========================================================================
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2 * Copyright 1988-2006 University of Washington
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3 *
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4 * Licensed under the Apache License, Version 2.0 (the "License");
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5 * you may not use this file except in compliance with the License.
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6 * You may obtain a copy of the License at
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7 *
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8 * http://www.apache.org/licenses/LICENSE-2.0
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9 *
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10 *
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11 * ========================================================================
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12 */
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13
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14 /*
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15 * Program: Free storage management routines
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16 *
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17 * Author: Mark Crispin
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18 * Networks and Distributed Computing
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19 * Computing & Communications
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20 * University of Washington
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21 * Administration Building, AG-44
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22 * Seattle, WA 98195
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23 * Internet: MRC@CAC.Washington.EDU
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24 *
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25 * Date: 1 August 1988
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26 * Last Edited: 30 August 2006
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27 */
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28
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29 /* Get a block of free storage
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30 * Accepts: size of desired block
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31 * Returns: free storage block
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32 */
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33
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34 void *fs_get (size_t size)
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35 {
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36 blocknotify_t bn = (blocknotify_t) mail_parameters (NIL,GET_BLOCKNOTIFY,NIL);
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37 void *data = (*bn) (BLOCK_SENSITIVE,NIL);
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38 void *block = malloc (size ? size : (size_t) 1);
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39 if (!block) fatal ("Out of memory");
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40 (*bn) (BLOCK_NONSENSITIVE,data);
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41 return (block);
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42 }
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43
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44
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45 /* Resize a block of free storage
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46 * Accepts: ** pointer to current block
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47 * new size
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48 */
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49
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50 void fs_resize (void **block,size_t size)
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51 {
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52 blocknotify_t bn = (blocknotify_t) mail_parameters (NIL,GET_BLOCKNOTIFY,NIL);
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53 void *data = (*bn) (BLOCK_SENSITIVE,NIL);
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54 if (!(*block = realloc (*block,size ? size : (size_t) 1)))
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55 fatal ("Can't resize memory");
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56 (*bn) (BLOCK_NONSENSITIVE,data);
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57 }
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58
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59
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60 /* Return a block of free storage
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61 * Accepts: ** pointer to free storage block
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62 */
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63
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64 void fs_give (void **block)
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65 {
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66 blocknotify_t bn = (blocknotify_t) mail_parameters (NIL,GET_BLOCKNOTIFY,NIL);
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67 void *data = (*bn) (BLOCK_SENSITIVE,NIL);
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68 free (*block);
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69 *block = NIL;
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70 (*bn) (BLOCK_NONSENSITIVE,data);
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71 }
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