pike.git/ src/ modules/ Image/ font.c

2003-10-07

2003-10-07 16:21:01 by Martin Stjernholm <mast@lysator.liu.se>

• 74e43512266032e02c75aad488defa7d6a6665d1 (28 lines) (+20/-8) ^{[ Show | Annotate ]}
  Branch: 7.9

Fixed some races if Image.Font.load() is called in several threads.
(Probably not a serious bug since Image.TTF or Image.FreeType mostly is used
instead of these bitmapped fonts.) The bug did not affect use of the builtin
font.

Rev: src/modules/Image/font.c:1.82

2:   || This file is part of Pike. For copyright information see COPYRIGHT.   || Pike is distributed under GPL, LGPL and MPL. See the file COPYING   || for more information. - || $Id: font.c,v 1.81 2003/09/10 15:21:58 mast Exp $ + || $Id: font.c,v 1.82 2003/10/07 16:21:01 mast Exp $   */      #include "global.h"
343:    size = (size_t) file_size(fd);    if (size > 0)    { -  new_font=THIS=(struct font *)xalloc(sizeof(struct font)); +  new_font=(struct font *)xalloc(sizeof(struct font));       THREADS_ALLOW();   #ifdef HAVE_MMAP
373:   #endif    THREADS_DISALLOW();    +  if (THIS) +  /* In case font_load got called again in the THREADS_ALLOW block. */ +  free_font_struct(THIS); +  THIS = new_font; +    loading_default:       if (THIS->mem)
624:    {    case 0:    to_write0 = STR0(sp[j-args].u.string); -  THREADS_ALLOW(); +  /* THREADS_ALLOW(); */ +  /* Can't release the thread here; this would point to freed +  * memory if font_load gets called. We'd have to refcount font +  * structs to cope with that, but since the released window +  * typically is short and since this code isn't used much now +  * when we have Image.FreeType, I bluntly disable it instead. +  * /mast */    for (i = 0; i < to_write_len; i++)    {    c=*(to_write0++);
640:    xsize += char_space(this, c);    }    } -  THREADS_DISALLOW(); +  /* THREADS_DISALLOW(); */    break;    case 1:    to_write1 = STR1(sp[j-args].u.string); -  THREADS_ALLOW(); +  /* THREADS_ALLOW(); */    for (i = 0; i < to_write_len; i++)    {    c=*(to_write1++);
660:    xsize += char_space(this, c);    }    } -  THREADS_DISALLOW(); +  /* THREADS_DISALLOW(); */    break;    case 2:    to_write2 = STR2(sp[j-args].u.string); -  THREADS_ALLOW(); +  /* THREADS_ALLOW(); */    for (i = 0; i < to_write_len; i++)    {    c=*(to_write2++);
680:    xsize += char_space(this, c);    }    } -  THREADS_DISALLOW(); +  /* THREADS_DISALLOW(); */    break;    default:    Pike_fatal("Illegal shift size!\n");