Roll libxml to 2.9.3

third_party/libxml/src/xmlmemory.c

 /*
  * xmlmemory.c:  libxml memory allocator wrapper.
  *
  * daniel@veillard.com
  */
 
 #define IN_LIBXML
 #include "libxml.h"
 
 #include <string.h>
@@ skipping 536 matching lines @@
 /**
  * xmlMemUsed:
  *
  * Provides the amount of memory currently allocated
  *
  * Returns an int representing the amount of memory allocated.
  */
 
 int
 xmlMemUsed(void) {
-     return(debugMemSize);
+    int res;
+
+    xmlMutexLock(xmlMemMutex);
+    res = debugMemSize;
+    xmlMutexUnlock(xmlMemMutex);
+    return(res);
 }
 
 /**
  * xmlMemBlocks:
  *
  * Provides the number of memory areas currently allocated
  *
  * Returns an int representing the number of blocks
  */
 
 int
 xmlMemBlocks(void) {
-     return(debugMemBlocks);
+    int res;
+
+    xmlMutexLock(xmlMemMutex);
+    res = debugMemBlocks;
+    xmlMutexUnlock(xmlMemMutex);
+    return(res);
 }
 
 #ifdef MEM_LIST
 /**
  * xmlMemContentShow:
  * @fp:  a FILE descriptor used as the output file
  * @p:  a memory block header
  *
  * tries to show some content from the memory block
  */
@@ skipping 534 matching lines @@
     if (freeFunc != NULL) *freeFunc = xmlFree;
     if (mallocFunc != NULL) *mallocFunc = xmlMalloc;
     if (mallocAtomicFunc != NULL) *mallocAtomicFunc = xmlMallocAtomic;
     if (reallocFunc != NULL) *reallocFunc = xmlRealloc;
     if (strdupFunc != NULL) *strdupFunc = xmlMemStrdup;
     return(0);
 }
 
 #define bottom_xmlmemory
 #include "elfgcchack.h"