Align top of stacks to a multiple of 16.

[simgrid.git] / src / kernel / context / Context.hpp

diff --git a/src/kernel/context/Context.hpp b/src/kernel/context/Context.hpp
index 8102fb1..090e7f4 100644 (file)
--- a/src/kernel/context/Context.hpp
+++ b/src/kernel/context/Context.hpp
@@ -6,6 +6,7 @@
 #ifndef SIMGRID_KERNEL_CONTEXT_CONTEXT_HPP
 #define SIMGRID_KERNEL_CONTEXT_CONTEXT_HPP
 
+#include <exception>
 #include <functional>
 #include <memory>
 #include <unordered_map>
@@ -80,6 +81,8 @@ namespace context {
     void_pfn_smxprocess_t cleanup_func_ = nullptr;
     smx_actor_t process_ = nullptr;
   public:
+    class StopRequest : public std::exception {
+    };
     bool iwannadie;
 
     Context(std::function<void()> code,
@@ -156,12 +159,12 @@ XBT_PUBLIC_DATA(char sigsegv_stack[SIGSTKSZ]);
 
 /* We are using the bottom of the stack to save some information, like the
  * valgrind_stack_id. Define smx_context_usable_stack_size to give the remaining
- * size for the stack. */
+ * size for the stack. Round its value to a multiple of 16 (for stack alignment). */
 #if HAVE_VALGRIND_H
-# define smx_context_usable_stack_size                                  \
-  (smx_context_stack_size - sizeof(unsigned int)) /* for valgrind_stack_id */
+#define smx_context_usable_stack_size                                                                                  \
+  ((smx_context_stack_size - sizeof(unsigned int)) & ~0xf) /* for valgrind_stack_id */
 #else
-# define smx_context_usable_stack_size smx_context_stack_size
+#define smx_context_usable_stack_size (smx_context_stack_size & ~0xf)
 #endif
 
 /** @brief Executes all the processes to run (in parallel if possible). */