/* 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). */