Indeed that pragma looks like a shared memory macro to me Actually one thing I found out is that DLLs and Shared Libraries are implemented via shared memory mapped files without giving access to shared memory. CodeDmitry I did get your message as you can see by the quote of my last reply. You are basically using Shared Memory IPC , its just an ungly Windows hack via a pragma and from the thread that Phil linked it looks like its also bug prone. This is also confirmed by Mircrosoft itself here -> https://msdn.microsoft.com/en-us/library/h90dkhs0(v=vs.90).aspx Summary: Use shared memory mapped files, far safer and far more cross platform On Wed, Oct 12, 2016 at 11:12 AM phil@highoctane.be <phil@highoctane.be> wrote:
#pragma data_seg("SHARED")
looks like this is doing some serious IPC magic behing the scenes.
Check this out for some critters: https://social.msdn.microsoft.com/Forums/vstudio/en-US/bc93445e-cec3-456d-95...
Phil
On Wed, Oct 12, 2016 at 9:34 AM, CodeDmitry <dimamakhnin@gmail.com> wrote:
Have you got my modified message? or have I been wasting my revisions all along O.o? I'll repost.
O.o can you please elaborate?
I wrote a DLL a while ago that successfully shared the global state it exported between the callers that without any shared memory explicitly being created.
I'll recreate a test case to make sure that I am not just lying.
*Solution SharingDemo*: *Project ShareMe*: *ShareMe.cpp*: #pragma data_seg("SHARED") extern "C" { __declspec(dllexport) int sharedInteger = 0; } #pragma data_seg()
#pragma comment(linker, "/section:SHARED,RWS")
*Project Client1*: *main.cpp*: #include <Windows.h> #include <stdio.h>
int main(int argc, char **argv) { HMODULE module_handle = LoadLibrary("ShareMe.dll"); int *shared_integer_handle = (int *)GetProcAddress(module_handle, "sharedInteger"); printf("*(shared_integer_handle) = %d.\n", *shared_integer_handle);
*shared_integer_handle = 1337;
printf("*(shared_integer_handle) = %d.\n", *shared_integer_handle);
system("pause"); return 0; }
*Project Client2*: *main.cpp*: #include <Windows.h> #include <stdio.h>
int main(int argc, char **argv) { HMODULE module_handle = LoadLibrary("ShareMe.dll"); int *shared_integer_handle = (int *)GetProcAddress(module_handle, "sharedInteger"); printf("*(shared_integer_handle) = %d.\n", *shared_integer_handle);
*shared_integer_handle = 0;
printf("*(shared_integer_handle) = %d.\n", *shared_integer_handle);
system("pause"); return 0; }
now, debug client1, then debug client2. Client 2 should start with mutated shared state(1337).
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