X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/9a74a4d9c970bf6b49d2c15d284ca190451d5ef6..b3ca3a517af21780e88cc89869b16927d1fea68a:/src/simix/smx_context.c

diff --git a/src/simix/smx_context.c b/src/simix/smx_context.c
index 0bfad29665..f222f62f28 100644
--- a/src/simix/smx_context.c
+++ b/src/simix/smx_context.c
@@ -14,7 +14,20 @@
 #include "simgrid/sg_config.h"
 #include "internal_config.h"
 #include "simgrid/modelchecker.h"
+
+
+#ifdef _WIN32
+#include <windows.h>
+#else
 #include <sys/mman.h>
+#endif
+
+#ifdef __MINGW32__ 
+#define _aligned_malloc __mingw_aligned_malloc 
+#define _aligned_free  __mingw_aligned_free 
+#endif //MINGW
+
+
 
 #ifdef HAVE_VALGRIND_VALGRIND_H
 # include <valgrind/valgrind.h>
@@ -111,7 +124,21 @@ void *SIMIX_context_stack_new(void)
 {
   void *stack;
 
+  /* FIXME: current code for stack overflow protection assumes that stacks are
+   * growing downward (PTH_STACKGROWTH == -1).  Protected pages need to be put
+   * after the stack when PTH_STACKGROWTH == 1. */
+
   if (smx_context_guard_size > 0 && !MC_is_active()) {
+
+#if defined(_XBT_WIN32) || (PTH_STACKGROWTH != -1)
+    static int warned_once = 0;
+    if (!warned_once) {
+      XBT_WARN("Stack overflow protection is known to be broken on your system.  Either you're on Windows or PTH_STACKGROWTH != -1 (current value is %d).",
+               PTH_STACKGROWTH);
+      warned_once = 1;
+    }
+#endif
+
     size_t size = smx_context_stack_size + smx_context_guard_size;
 #ifdef HAVE_MC
     /* Cannot use posix_memalign when HAVE_MC. Align stack by hand, and save the
@@ -119,14 +146,19 @@ void *SIMIX_context_stack_new(void)
     char *alloc = xbt_malloc0(size + xbt_pagesize);
     stack = alloc - ((uintptr_t)alloc & (xbt_pagesize - 1)) + xbt_pagesize;
     *((void **)stack - 1) = alloc;
-#else
+#elif !defined(_XBT_WIN32)
     if (posix_memalign(&stack, xbt_pagesize, size) != 0)
       xbt_die("Failed to allocate stack.");
+#else
+    stack = _aligned_malloc(size, xbt_pagesize);
 #endif
+
+#ifndef _XBT_WIN32
     if (mprotect(stack, smx_context_guard_size, PROT_NONE) == -1) {
       XBT_WARN("Failed to protect stack: %s", strerror(errno));
       /* That's not fatal, pursue anyway. */
     }
+#endif
     stack = (char *)stack + smx_context_guard_size;
   } else {
     stack = xbt_malloc0(smx_context_stack_size);
@@ -154,6 +186,7 @@ void SIMIX_context_stack_delete(void *stack)
   VALGRIND_STACK_DEREGISTER(valgrind_stack_id);
 #endif
 
+#ifndef WIN32
   if (smx_context_guard_size > 0 && !MC_is_active()) {
     stack = (char *)stack - smx_context_guard_size;
     if (mprotect(stack, smx_context_guard_size,
@@ -166,6 +199,8 @@ void SIMIX_context_stack_delete(void *stack)
     stack = *((void **)stack - 1);
 #endif
   }
+#endif
+
   xbt_free(stack);
 }