portability cheating: avoid the configurations that are known to be broken

[simgrid.git] / src / simix / smx_context.cpp

diff --git a/src/simix/smx_context.cpp b/src/simix/smx_context.cpp
index 0238f90..90a7d13 100644 (file)
--- a/src/simix/smx_context.cpp
+++ b/src/simix/smx_context.cpp
@@ -1,7 +1,6 @@
 /* a fast and simple context switching library                              */
 
-/* Copyright (c) 2009-2015. The SimGrid Team.
- * All rights reserved.                                                     */
+/* Copyright (c) 2009-2017. The SimGrid Team. All rights reserved.          */
 
 /* This program is free software; you can redistribute it and/or modify it
  * under the terms of the license (GNU LGPL) which comes with this package. */
@@ -107,6 +106,20 @@ void SIMIX_context_mod_init()
   xbt_os_thread_key_create(&smx_current_context_key);
 #endif
 
+#if defined(__APPLE__) || defined(__NetBSD__)
+  if (context_factory_name == std::string("thread") &&
+      strcmp(xbt_cfg_get_string("smpi/privatization"), "dlopen") == 0) {
+    XBT_WARN("dlopen+thread broken on Apple and BSD. Switching to raw contexts.");
+    context_factory_name = "raw";
+  }
+#endif
+#if defined(__FreeBSD__)
+  if (context_factory_name == std::string("thread") && strcmp(xbt_cfg_get_string("smpi/privatization"), "no") != 0) {
+    XBT_WARN("mmap broken on FreeBSD, but dlopen+thread broken too. Switching to dlopen+raw contexts.");
+    context_factory_name = "raw";
+  }
+#endif
+
   /* select the context factory to use to create the contexts */
   if (simgrid::kernel::context::factory_initializer) { // Give Java a chance to hijack the factory mechanism
     simix_global->context_factory = simgrid::kernel::context::factory_initializer();
@@ -184,9 +197,13 @@ void *SIMIX_context_stack_new()
 
 #ifndef _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. */
+      xbt_die(
+          "Failed to protect stack: %s.\n"
+          "If you are running a lot of actors, you may be exceeding the amount of mappings allowed per process.\n"
+          "On Linux systems, change this value with sudo sysctl -w vm.max_map_count=newvalue (default value: 65536)\n"
+          "Please see http://simgrid.gforge.inria.fr/simgrid/latest/doc/html/options.html#options_virt for more info.",
+          strerror(errno));
+      /* This is fatal. We are going to fail at some point when we try reusing this. */
     }
 #endif
     stack = (char *)stack + smx_context_guard_size;