home *** CD-ROM | disk | FTP | other *** search
/ AmigActive 21 / AACD 21.iso / AACD / Utilities / Ghostscript / src / gsmemlok.c < prev    next >
Encoding:
C/C++ Source or Header  |  2001-01-01  |  11.4 KB  |  395 lines
  1. /* Copyright (C) 1998, 2000 Aladdin Enterprises.  All rights reserved.
  2.   
  3.   This file is part of AFPL Ghostscript.
  4.   
  5.   AFPL Ghostscript is distributed with NO WARRANTY OF ANY KIND.  No author or
  6.   distributor accepts any responsibility for the consequences of using it, or
  7.   for whether it serves any particular purpose or works at all, unless he or
  8.   she says so in writing.  Refer to the Aladdin Free Public License (the
  9.   "License") for full details.
  10.   
  11.   Every copy of AFPL Ghostscript must include a copy of the License, normally
  12.   in a plain ASCII text file named PUBLIC.  The License grants you the right
  13.   to copy, modify and redistribute AFPL Ghostscript, but only under certain
  14.   conditions described in the License.  Among other things, the License
  15.   requires that the copyright notice and this notice be preserved on all
  16.   copies.
  17. */
  18.  
  19. /*$Id: gsmemlok.c,v 1.3 2000/09/19 19:00:29 lpd Exp $ */
  20. /* Monitor-locked heap memory allocator */
  21.  
  22. /* Initial version 2/1/98 by John Desrosiers (soho@crl.com) */
  23. /* Revised 8/6/98 by L. Peter Deutsch (ghost@aladdin.com) for changes */
  24. /*   in memory manager API */
  25. /* Edited 3/23/1999 by L. Peter Deutsch to remove compiler warnings. */
  26.  
  27. #include "gx.h"
  28. #include "gsmemlok.h"
  29. #include "gserrors.h"
  30.  
  31. /* Raw memory procedures */
  32. private gs_memory_proc_alloc_bytes(gs_locked_alloc_bytes_immovable);
  33. private gs_memory_proc_resize_object(gs_locked_resize_object);
  34. private gs_memory_proc_free_object(gs_locked_free_object);
  35. private gs_memory_proc_stable(gs_locked_stable);
  36. private gs_memory_proc_status(gs_locked_status);
  37. private gs_memory_proc_free_all(gs_locked_free_all);
  38. private gs_memory_proc_consolidate_free(gs_locked_consolidate_free);
  39.  
  40. /* Object memory procedures */
  41. private gs_memory_proc_alloc_bytes(gs_locked_alloc_bytes);
  42. private gs_memory_proc_alloc_struct(gs_locked_alloc_struct);
  43. private gs_memory_proc_alloc_struct(gs_locked_alloc_struct_immovable);
  44. private gs_memory_proc_alloc_byte_array(gs_locked_alloc_byte_array);
  45. private gs_memory_proc_alloc_byte_array(gs_locked_alloc_byte_array_immovable);
  46. private gs_memory_proc_alloc_struct_array(gs_locked_alloc_struct_array);
  47. private gs_memory_proc_alloc_struct_array(gs_locked_alloc_struct_array_immovable);
  48. private gs_memory_proc_object_size(gs_locked_object_size);
  49. private gs_memory_proc_object_type(gs_locked_object_type);
  50. private gs_memory_proc_alloc_string(gs_locked_alloc_string);
  51. private gs_memory_proc_alloc_string(gs_locked_alloc_string_immovable);
  52. private gs_memory_proc_resize_string(gs_locked_resize_string);
  53. private gs_memory_proc_free_string(gs_locked_free_string);
  54. private gs_memory_proc_register_root(gs_locked_register_root);
  55. private gs_memory_proc_unregister_root(gs_locked_unregister_root);
  56. private gs_memory_proc_enable_free(gs_locked_enable_free);
  57. private const gs_memory_procs_t locked_procs =
  58. {
  59.     /* Raw memory procedures */
  60.     gs_locked_alloc_bytes_immovable,
  61.     gs_locked_resize_object,
  62.     gs_locked_free_object,
  63.     gs_locked_stable,
  64.     gs_locked_status,
  65.     gs_locked_free_all,
  66.     gs_locked_consolidate_free,
  67.     /* Object memory procedures */
  68.     gs_locked_alloc_bytes,
  69.     gs_locked_alloc_struct,
  70.     gs_locked_alloc_struct_immovable,
  71.     gs_locked_alloc_byte_array,
  72.     gs_locked_alloc_byte_array_immovable,
  73.     gs_locked_alloc_struct_array,
  74.     gs_locked_alloc_struct_array_immovable,
  75.     gs_locked_object_size,
  76.     gs_locked_object_type,
  77.     gs_locked_alloc_string,
  78.     gs_locked_alloc_string_immovable,
  79.     gs_locked_resize_string,
  80.     gs_locked_free_string,
  81.     gs_locked_register_root,
  82.     gs_locked_unregister_root,
  83.     gs_locked_enable_free
  84. };
  85.  
  86. /* ---------- Public constructors/destructors ---------- */
  87.  
  88. /* Initialize a gs_memory_locked_t */
  89. int                /* -ve error code or 0 */
  90. gs_memory_locked_init(
  91.               gs_memory_locked_t * lmem,    /* allocator to init */
  92.               gs_memory_t * target    /* allocator to monitor lock */
  93. )
  94. {
  95.     lmem->stable_memory = 0;
  96.     lmem->procs = locked_procs;
  97.  
  98.     lmem->target = target;
  99.  
  100.     /* Allocate a monitor to serialize access to structures within */
  101.     lmem->monitor = gx_monitor_alloc(target);
  102.     return (lmem->monitor ? 0 : gs_note_error(gs_error_VMerror));
  103. }
  104.  
  105. /* Release a locked memory manager. */
  106. /* Note that this has no effect on the target. */
  107. void
  108. gs_memory_locked_release(gs_memory_locked_t *lmem)
  109. {
  110.     gs_memory_free_all((gs_memory_t *)lmem, FREE_ALL_STRUCTURES,
  111.                "gs_memory_locked_release");
  112. }
  113.  
  114. /* ---------- Accessors ------------- */
  115.  
  116. /* Retrieve this allocator's target */
  117. gs_memory_t *
  118. gs_memory_locked_target(const gs_memory_locked_t *lmem)
  119. {
  120.     return lmem->target;
  121. }
  122.  
  123. /* -------- Private members just wrap a monitor around a gs_memory_heap --- */
  124.  
  125. /*
  126.  * Contrary to our usual practice, we don't use BEGIN/END here, because
  127.  * that causes some compilers to give bogus error messages.
  128.  */
  129.  
  130. #define DO_MONITORED(call_target)\
  131.     gs_memory_locked_t * const lmem = (gs_memory_locked_t *)mem;\
  132. \
  133.     gx_monitor_enter(lmem->monitor);\
  134.     call_target;\
  135.     gx_monitor_leave(lmem->monitor)
  136.  
  137. #define RETURN_MONITORED(result_type, call_target)\
  138.     gs_memory_locked_t * const lmem = (gs_memory_locked_t *)mem;\
  139.     result_type temp;\
  140. \
  141.     gx_monitor_enter(lmem->monitor);\
  142.     temp = call_target;\
  143.     gx_monitor_leave(lmem->monitor);\
  144.     return temp
  145.  
  146. /* Procedures */
  147. private void
  148. gs_locked_free_all(gs_memory_t * mem, uint free_mask, client_name_t cname)
  149. {
  150.     gs_memory_locked_t * const lmem = (gs_memory_locked_t *)mem;
  151.     gs_memory_t * const target = lmem->target;
  152.  
  153.     /* Only free the structures and the allocator itself. */
  154.     if (mem->stable_memory) {
  155.     if (mem->stable_memory != mem)
  156.         gs_memory_free_all(mem->stable_memory, free_mask, cname);
  157.     if (free_mask & FREE_ALL_ALLOCATOR)
  158.         mem->stable_memory = 0;
  159.     }
  160.     if (free_mask & FREE_ALL_STRUCTURES) {
  161.     /*
  162.      * Check for monitor == 0, in case this is called after a
  163.      * failure during initialization.
  164.      */
  165.     if (lmem->monitor)
  166.         gx_monitor_free(lmem->monitor);
  167.     lmem->monitor = 0;
  168.     lmem->target = 0;
  169.     }
  170.     if (free_mask & FREE_ALL_ALLOCATOR)
  171.     gs_free_object(target, lmem, cname);
  172. }
  173. private void
  174. gs_locked_consolidate_free(gs_memory_t * mem)
  175. {
  176.     DO_MONITORED(
  177.          (*lmem->target->procs.consolidate_free)(lmem->target)
  178.          );
  179. }
  180. private byte *
  181. gs_locked_alloc_bytes(gs_memory_t * mem, uint size, client_name_t cname)
  182. {
  183.     RETURN_MONITORED(
  184.              byte *,
  185.              (*lmem->target->procs.alloc_bytes)
  186.                (lmem->target, size, cname)
  187.              );
  188. }
  189. private byte *
  190. gs_locked_alloc_bytes_immovable(gs_memory_t * mem, uint size,
  191.                 client_name_t cname)
  192. {
  193.     RETURN_MONITORED(
  194.              byte *,
  195.              (*lmem->target->procs.alloc_bytes_immovable)
  196.                (lmem->target, size, cname)
  197.              );
  198. }
  199. private void *
  200. gs_locked_alloc_struct(gs_memory_t * mem, gs_memory_type_ptr_t pstype,
  201.                client_name_t cname)
  202. {
  203.     RETURN_MONITORED(
  204.              void *,
  205.              (*lmem->target->procs.alloc_struct)
  206.                (lmem->target, pstype, cname)
  207.              );
  208. }
  209. private void *
  210. gs_locked_alloc_struct_immovable(gs_memory_t * mem,
  211.                gs_memory_type_ptr_t pstype, client_name_t cname)
  212. {
  213.     RETURN_MONITORED(
  214.              void *,
  215.              (*lmem->target->procs.alloc_struct_immovable)
  216.                (lmem->target, pstype, cname)
  217.              );
  218. }
  219. private byte *
  220. gs_locked_alloc_byte_array(gs_memory_t * mem, uint num_elements, uint elt_size,
  221.                client_name_t cname)
  222. {
  223.     RETURN_MONITORED(
  224.              byte *,
  225.              (*lmem->target->procs.alloc_byte_array)
  226.                (lmem->target, num_elements, elt_size, cname)
  227.              );
  228. }
  229. private byte *
  230. gs_locked_alloc_byte_array_immovable(gs_memory_t * mem, uint num_elements,
  231.                      uint elt_size, client_name_t cname)
  232. {
  233.     RETURN_MONITORED(
  234.              byte *,
  235.              (*lmem->target->procs.alloc_byte_array_immovable)
  236.                (lmem->target, num_elements, elt_size, cname)
  237.              );
  238. }
  239. private void *
  240. gs_locked_alloc_struct_array(gs_memory_t * mem, uint num_elements,
  241.                gs_memory_type_ptr_t pstype, client_name_t cname)
  242. {
  243.     RETURN_MONITORED(
  244.              void *,
  245.              (*lmem->target->procs.alloc_struct_array)
  246.                (lmem->target, num_elements, pstype, cname)
  247.              );
  248. }
  249. private void *
  250. gs_locked_alloc_struct_array_immovable(gs_memory_t * mem, uint num_elements,
  251.                gs_memory_type_ptr_t pstype, client_name_t cname)
  252. {
  253.     RETURN_MONITORED(
  254.              void *,
  255.              (*lmem->target->procs.alloc_struct_array_immovable)
  256.                (lmem->target, num_elements, pstype, cname)
  257.              );
  258. }
  259. private void *
  260. gs_locked_resize_object(gs_memory_t * mem, void *obj, uint new_num_elements,
  261.             client_name_t cname)
  262. {
  263.     RETURN_MONITORED(
  264.              void *,
  265.              (*lmem->target->procs.resize_object)
  266.                (lmem->target, obj, new_num_elements, cname)
  267.              );
  268. }
  269. private uint
  270. gs_locked_object_size(gs_memory_t * mem, const void *ptr)
  271. {
  272.     RETURN_MONITORED(
  273.              uint,
  274.              (*lmem->target->procs.object_size)
  275.                (lmem->target, ptr)
  276.              );
  277. }
  278. private gs_memory_type_ptr_t
  279. gs_locked_object_type(gs_memory_t * mem, const void *ptr)
  280. {
  281.     RETURN_MONITORED(
  282.              gs_memory_type_ptr_t,
  283.              (*lmem->target->procs.object_type)
  284.                (lmem->target, ptr)
  285.              );
  286. }
  287. private void
  288. gs_locked_free_object(gs_memory_t * mem, void *ptr, client_name_t cname)
  289. {
  290.     DO_MONITORED(
  291.          (*lmem->target->procs.free_object)
  292.                (lmem->target, ptr, cname)
  293.          );
  294. }
  295. private byte *
  296. gs_locked_alloc_string(gs_memory_t * mem, uint nbytes, client_name_t cname)
  297. {
  298.     RETURN_MONITORED(
  299.              byte *,
  300.              (*lmem->target->procs.alloc_string)
  301.                (lmem->target, nbytes, cname)
  302.              );
  303. }
  304. private byte *
  305. gs_locked_alloc_string_immovable(gs_memory_t * mem, uint nbytes,
  306.                  client_name_t cname)
  307. {
  308.     RETURN_MONITORED(
  309.              byte *,
  310.              (*lmem->target->procs.alloc_string_immovable)
  311.                (lmem->target, nbytes, cname)
  312.              );
  313. }
  314. private byte *
  315. gs_locked_resize_string(gs_memory_t * mem, byte * data, uint old_num,
  316.             uint new_num,
  317.             client_name_t cname)
  318. {
  319.     RETURN_MONITORED(
  320.              byte *,
  321.              (*lmem->target->procs.resize_string)
  322.                (lmem->target, data, old_num, new_num, cname)
  323.              );
  324. }
  325. private void
  326. gs_locked_free_string(gs_memory_t * mem, byte * data, uint nbytes,
  327.               client_name_t cname)
  328. {
  329.     DO_MONITORED(
  330.          (*lmem->target->procs.free_string)
  331.            (lmem->target, data, nbytes, cname)
  332.          );
  333. }
  334. private int
  335. gs_locked_register_root(gs_memory_t * mem, gs_gc_root_t * rp,
  336.             gs_ptr_type_t ptype, void **up, client_name_t cname)
  337. {
  338.     RETURN_MONITORED(
  339.              int,
  340.              (*lmem->target->procs.register_root)
  341.                (lmem->target, rp, ptype, up, cname)
  342.              );
  343. }
  344. private void
  345. gs_locked_unregister_root(gs_memory_t * mem, gs_gc_root_t * rp,
  346.               client_name_t cname)
  347. {
  348.     DO_MONITORED(
  349.          (*lmem->target->procs.unregister_root)
  350.            (lmem->target, rp, cname)
  351.          );
  352. }
  353. private gs_memory_t *
  354. gs_locked_stable(gs_memory_t * mem)
  355. {
  356.     if (!mem->stable_memory) {
  357.     gs_memory_locked_t * const lmem = (gs_memory_locked_t *)mem;
  358.     gs_memory_t *stable;
  359.  
  360.     gx_monitor_enter(lmem->monitor);
  361.     stable = gs_memory_stable(lmem->target);
  362.     if (stable == lmem->target)
  363.         mem->stable_memory = mem;
  364.     else {
  365.         gs_memory_locked_t *locked_stable = (gs_memory_locked_t *)
  366.         gs_alloc_bytes(stable, sizeof(*lmem), "gs_locked_stable");
  367.  
  368.         if (locked_stable) {
  369.         int code = gs_memory_locked_init(locked_stable, stable);
  370.  
  371.         if (code < 0)
  372.             gs_free_object(stable, locked_stable, "gs_locked_stable");
  373.         else
  374.             mem->stable_memory = (gs_memory_t *)locked_stable;
  375.         }
  376.     }
  377.     gx_monitor_leave(lmem->monitor);
  378.     }
  379.     return mem->stable_memory;
  380. }
  381. private void
  382. gs_locked_status(gs_memory_t * mem, gs_memory_status_t * pstat)
  383. {
  384.     DO_MONITORED(
  385.          (*lmem->target->procs.status)(lmem->target, pstat)
  386.          );
  387. }
  388. private void
  389. gs_locked_enable_free(gs_memory_t * mem, bool enable)
  390. {
  391.     DO_MONITORED(
  392.          (*lmem->target->procs.enable_free)(lmem->target, enable)
  393.          );
  394. }
  395.