1 /* ========================================================================

2 * Copyright 1988-2006 University of Washington

3 *

4 * Licensed under the Apache License, Version 2.0 (the "License");

5 * you may not use this file except in compliance with the License.

6 * You may obtain a copy of the License at

7 *

8 * http://www.apache.org/licenses/LICENSE-2.0

9 *

10 *

11 * ========================================================================

12 */

13

14 /*

15 * Program: Free storage management routines

16 *

17 * Author: Mark Crispin

18 * Networks and Distributed Computing

19 * Computing & Communications

20 * University of Washington

21 * Administration Building, AG-44

22 * Seattle, WA 98195

23 * Internet: MRC@CAC.Washington.EDU

24 *

25 * Date: 1 August 1988

26 * Last Edited: 30 August 2006

27 */

28 

29 /* Get a block of free storage

30 * Accepts: size of desired block

31 * Returns: free storage block

32 */

33

34 void *fs_get (size_t size)

35 {

36 blocknotify_t bn = (blocknotify_t) mail_parameters (NIL,GET_BLOCKNOTIFY,NIL);

37 void *data = (*bn) (BLOCK_SENSITIVE,NIL);

38 void *block = malloc (size ? size : (size_t) 1);

39 if (!block) fatal ("Out of memory");

40 (*bn) (BLOCK_NONSENSITIVE,data);

41 return (block);

42 }

43

44

45 /* Resize a block of free storage

46 * Accepts: ** pointer to current block

47 * new size

48 */

49

50 void fs_resize (void **block,size_t size)

51 {

52 blocknotify_t bn = (blocknotify_t) mail_parameters (NIL,GET_BLOCKNOTIFY,NIL);

53 void *data = (*bn) (BLOCK_SENSITIVE,NIL);

54 if (!(*block = realloc (*block,size ? size : (size_t) 1)))

55 fatal ("Can't resize memory");

56 (*bn) (BLOCK_NONSENSITIVE,data);

57 }

58

59

60 /* Return a block of free storage

61 * Accepts: ** pointer to free storage block

62 */

63

64 void fs_give (void **block)

65 {

66 blocknotify_t bn = (blocknotify_t) mail_parameters (NIL,GET_BLOCKNOTIFY,NIL);

67 void *data = (*bn) (BLOCK_SENSITIVE,NIL);

68 free (*block);

69 *block = NIL;

70 (*bn) (BLOCK_NONSENSITIVE,data);

71 }