WINGs/memory.c

   1 /*
   2  *  Window Maker miscelaneous function library
   3  *
   4  *  Copyright (c) 1997-2003 Alfredo K. Kojima
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
  19  *  MA 02110-1301, USA.
  20  */
  21
  22 #include "wconfig.h"
  23 #include "WUtil.h"
  24
  25 #include <stdlib.h>
  26 #include <sys/types.h>
  27 #include <unistd.h>
  28 #include <stdio.h>
  29 #include <string.h>
  30 #include <assert.h>
  31 #include <signal.h>
  32
  33 #ifdef HAVE_STDNORETURN
  34 #include <stdnoreturn.h>
  35 #endif
  36
  37 #ifdef USE_BOEHM_GC
  38 #ifndef GC_DEBUG
  39 #define GC_DEBUG
  40 #endif /* !GC_DEBUG */
  41 #include <gc/gc.h>
  42 #endif /* USE_BOEHM_GC */
  43
  44 #ifndef False
  45 # define False 0
  46 #endif
  47 #ifndef True
  48 # define True 1
  49 #endif
  50
  51 static void defaultHandler(int bla)
  52 {
  53         if (bla)
  54                 kill(getpid(), SIGABRT);
  55         else
  56                 exit(1);
  57 }
  58
  59 static waborthandler *aborthandler = defaultHandler;
  60
  61 static inline noreturn void wAbort(int bla)
  62 {
  63         (*aborthandler)(bla);
  64         exit(-1);
  65 }
  66
  67 waborthandler *wsetabort(waborthandler * handler)
  68 {
  69         waborthandler *old = aborthandler;
  70
  71         aborthandler = handler;
  72
  73         return old;
  74 }
  75
  76 static int Aborting = 0;        /* if we're in the middle of an emergency exit */
  77
  78 static WMHashTable *table = NULL;
  79
  80 void *wmalloc(size_t size)
  81 {
  82         void *tmp;
  83
  84         assert(size > 0);
  85
  86 #ifdef USE_BOEHM_GC
  87         tmp = GC_MALLOC(size);
  88 #else
  89         tmp = malloc(size);
  90 #endif
  91         if (tmp == NULL) {
  92                 wwarning("malloc() failed. Retrying after 2s.");
  93                 sleep(2);
  94 #ifdef USE_BOEHM_GC
  95                 tmp = GC_MALLOC(size);
  96 #else
  97                 tmp = malloc(size);
  98 #endif
  99                 if (tmp == NULL) {
 100                         if (Aborting) {
 101                                 fputs("Really Bad Error: recursive malloc() failure.", stderr);
 102                                 exit(-1);
 103                         } else {
 104                                 wfatal("virtual memory exhausted");
 105                                 Aborting = 1;
 106                                 wAbort(False);
 107                         }
 108                 }
 109         }
 110         memset(tmp, 0, size);
 111         return tmp;
 112 }
 113
 114 void *wrealloc(void *ptr, size_t newsize)
 115 {
 116         void *nptr;
 117
 118         if (!ptr) {
 119                 nptr = wmalloc(newsize);
 120         } else if (newsize == 0) {
 121                 wfree(ptr);
 122                 nptr = NULL;
 123         } else {
 124 #ifdef USE_BOEHM_GC
 125                 nptr = GC_REALLOC(ptr, newsize);
 126 #else
 127                 nptr = realloc(ptr, newsize);
 128 #endif
 129                 if (nptr == NULL) {
 130                         wwarning("realloc() failed. Retrying after 2s.");
 131                         sleep(2);
 132 #ifdef USE_BOEHM_GC
 133                         nptr = GC_REALLOC(ptr, newsize);
 134 #else
 135                         nptr = realloc(ptr, newsize);
 136 #endif
 137                         if (nptr == NULL) {
 138                                 if (Aborting) {
 139                                         fputs("Really Bad Error: recursive realloc() failure.", stderr);
 140                                         exit(-1);
 141                                 } else {
 142                                         wfatal("virtual memory exhausted");
 143                                         Aborting = 1;
 144                                         wAbort(False);
 145                                 }
 146                         }
 147                 }
 148         }
 149         return nptr;
 150 }
 151
 152 void *wretain(void *ptr)
 153 {
 154         int *refcount;
 155
 156         if (!table) {
 157                 table = WMCreateHashTable(WMIntHashCallbacks);
 158         }
 159
 160         refcount = WMHashGet(table, ptr);
 161         if (!refcount) {
 162                 refcount = wmalloc(sizeof(int));
 163                 *refcount = 1;
 164                 WMHashInsert(table, ptr, refcount);
 165 #ifdef VERBOSE
 166                 printf("== %i (%p)\n", *refcount, ptr);
 167 #endif
 168         } else {
 169                 (*refcount)++;
 170 #ifdef VERBOSE
 171                 printf("+ %i (%p)\n", *refcount, ptr);
 172 #endif
 173         }
 174
 175         return ptr;
 176 }
 177
 178 void wfree(void *ptr)
 179 {
 180         if (ptr)
 181 #ifdef USE_BOEHM_GC
 182                 /* This should eventually be removed, once the criss-cross
 183                  * of wmalloc()d memory being free()d, malloc()d memory being
 184                  * wfree()d, various misuses of calling wfree() on objects
 185                  * allocated by libc malloc() and calling libc free() on
 186                  * objects allocated by Boehm GC (think external libraries)
 187                  * is cleaned up.
 188                  */
 189                 if (GC_base(ptr) != 0)
 190                         GC_FREE(ptr);
 191                 else
 192                         free(ptr);
 193 #else
 194                 free(ptr);
 195 #endif
 196         ptr = NULL;
 197 }
 198
 199 void wrelease(void *ptr)
 200 {
 201         int *refcount;
 202
 203         refcount = WMHashGet(table, ptr);
 204         if (!refcount) {
 205                 wwarning("trying to release unexisting data %p", ptr);
 206         } else {
 207                 (*refcount)--;
 208                 if (*refcount < 1) {
 209 #ifdef VERBOSE
 210                         printf("RELEASING %p\n", ptr);
 211 #endif
 212                         WMHashRemove(table, ptr);
 213                         wfree(refcount);
 214                         wfree(ptr);
 215                 }
 216 #ifdef VERBOSE
 217                 else {
 218                         printf("- %i (%p)\n", *refcount, ptr);
 219                 }
 220 #endif
 221         }
 222 }