X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/9101037a209e6c26945c22a57996c011ef9ecfaa..ba5400c9278f4f61cf8319210a5edda78e0c5bd8:/src/simix/smx_context.c

diff --git a/src/simix/smx_context.c b/src/simix/smx_context.c
index 833ca8414a..9adeeac59e 100644
--- a/src/simix/smx_context.c
+++ b/src/simix/smx_context.c
@@ -1,6 +1,6 @@
 /* a fast and simple context switching library                              */
 
-/* Copyright (c) 2009-2014. The SimGrid Team.
+/* Copyright (c) 2009-2015. The SimGrid Team.
  * All rights reserved.                                                     */
 
 /* This program is free software; you can redistribute it and/or modify it
@@ -14,7 +14,22 @@
 #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
+
+#if defined(_XBT_WIN32)
+#include <malloc.h>
+#endif
 
 #ifdef HAVE_VALGRIND_VALGRIND_H
 # include <valgrind/valgrind.h>
@@ -72,6 +87,12 @@ void SIMIX_context_mod_init(void)
         /* use raw contexts */
         SIMIX_ctx_raw_factory_init(&simix_global->context_factory);
       }
+#endif
+#ifdef HAVE_BOOST_CONTEXT
+      else if (!strcmp(smx_context_factory_name, "boost")) {
+        /* use Boost.Context */
+        SIMIX_ctx_boost_factory_init(&simix_global->context_factory);
+      }
 #endif
       else {
         XBT_ERROR("Invalid context factory specified. Valid factories on this machine:");
@@ -111,7 +132,21 @@ 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
@@ -119,11 +154,20 @@ 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;
+#elif !defined(_XBT_WIN32)
+    if (posix_memalign(&stack, xbt_pagesize, size) != 0)
+      xbt_die("Failed to allocate stack.");
 #else
-    posix_memalign(&stack, xbt_pagesize, size);
+    stack = _aligned_malloc(size, xbt_pagesize);
+#endif
+
+#ifndef _XBT_WIN32
+    if (mprotect(stack, smx_context_guard_size, PROT_NONE) == -1) {
+      xbt_die("Failed to protect stack: %s", strerror(errno));
+      /* This is fatal. We are going to fail at some point when
+         we tryi reusing this. */
+    }
 #endif
-    if (!stack || mprotect(stack, smx_context_guard_size, PROT_NONE) == -1)
-      xbt_die("Failed to allocate stack: %s", strerror(errno));
     stack = (char *)stack + smx_context_guard_size;
   } else {
     stack = xbt_malloc0(smx_context_stack_size);
@@ -151,17 +195,21 @@ 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,
-                 PROT_READ | PROT_WRITE | PROT_EXEC) == -1)
+                 PROT_READ | PROT_WRITE) == -1) {
       XBT_WARN("Failed to remove page protection: %s", strerror(errno));
-    /* try to pursue anyway */
+      /* try to pursue anyway */
+    }
 #ifdef HAVE_MC
     /* Retrieve the saved pointer.  See SIMIX_context_stack_new above. */
     stack = *((void **)stack - 1);
 #endif
   }
+#endif
+
   xbt_free(stack);
 }