diff -up wvstreams-4.6.1/include/wvtask.h.magic wvstreams-4.6.1/include/wvtask.h

--- wvstreams-4.6.1/include/wvtask.h.magic	2008-07-14 21:11:35.000000000 +0200

+++ wvstreams-4.6.1/include/wvtask.h	2012-06-03 17:24:47.909187849 +0200

@@ -45,7 +45,8 @@ class WvTask

     typedef void TaskFunc(void *userdata);

     static int taskcount, numtasks, numrunning;

-    int magic_number, *stack_magic;

+    int volatile magic_number;

+    int *stack_magic;

     WvString name;

     int tid;

@@ -84,7 +85,7 @@ class WvTaskMan

     static WvTaskMan *singleton;

     static int links;

-    static int magic_number;

+    static int volatile magic_number;

     static WvTaskList all_tasks, free_tasks;

     static void get_stack(WvTask &task, size_t size);

diff -up wvstreams-4.6.1/utils/wvtask.cc.magic wvstreams-4.6.1/utils/wvtask.cc

--- wvstreams-4.6.1/utils/wvtask.cc.magic	2009-05-13 23:42:52.000000000 +0200

+++ wvstreams-4.6.1/utils/wvtask.cc	2012-06-03 14:29:09.729656804 +0200

@@ -58,7 +58,8 @@ char *alloca ();

 int WvTask::taskcount, WvTask::numtasks, WvTask::numrunning;

 WvTaskMan *WvTaskMan::singleton;

-int WvTaskMan::links, WvTaskMan::magic_number;

+int WvTaskMan::links;

+int volatile WvTaskMan::magic_number;

 WvTaskList WvTaskMan::all_tasks, WvTaskMan::free_tasks;

 ucontext_t WvTaskMan::stackmaster_task, WvTaskMan::get_stack_return,

     WvTaskMan::toplevel;