From 72948525ec3ef03fe46553349c1892cafa5ac18c Mon Sep 17 00:00:00 2001 From: brain Date: Sat, 2 Jun 2007 15:05:49 +0000 Subject: Add comments git-svn-id: http://svn.inspircd.org/repository/trunk/inspircd@7212 e03df62e-2008-0410-955e-edbf42e46eb7 --- win/inspircd_memory_functions.cpp | 16 +++++++++++++--- 1 file changed, 13 insertions(+), 3 deletions(-) (limited to 'win/inspircd_memory_functions.cpp') diff --git a/win/inspircd_memory_functions.cpp b/win/inspircd_memory_functions.cpp index d487f69e3..ea4afa04c 100644 --- a/win/inspircd_memory_functions.cpp +++ b/win/inspircd_memory_functions.cpp @@ -1,14 +1,24 @@ -// Use the global heap for this process for all allocate/free operations. #include "inspircd_win32wrapper.h" #include #include #include +/** On windows, all dll files and executables have their own private heap, + * whereas on POSIX systems, shared objects loaded into an executable share + * the executable's heap. This means that if we pass an arbitrary pointer to + * a windows DLL which is not allocated in that dll, without some form of + * marshalling, we get a page fault. To fix this, these overrided operators + * new and delete use the windows HeapAlloc and HeapFree functions to claim + * memory from the windows global heap. This makes windows 'act like' POSIX + * when it comes to memory usage between dlls and exes. + */ + void * ::operator new(size_t iSize) { - void* ptr = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, iSize); // zero memory for unix compatibility + void* ptr = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, iSize); /* zero memory for unix compatibility */ /* This is the correct behaviour according to C++ standards for out of memory, - * not returning null -- Brain*/ + * not returning null -- Brain + */ if (!ptr) throw std::bad_alloc(); else -- cgit v1.2.3