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00020 #include <config.h>
00021 #include <drizzled/internal/my_sys.h>
00022 #include <drizzled/definitions.h>
00023 #include <drizzled/session.h>
00024 #include <drizzled/error.h>
00025 #include <drizzled/check_stack_overrun.h>
00026
00027 namespace drizzled
00028 {
00029
00030
00031
00032
00033 #if defined(STACK_DIRECTION) && (STACK_DIRECTION < 0)
00034 static const bool stack_direction_negative = true;
00035 #else
00036 static const bool stack_direction_negative = false;
00037 #endif
00038
00039 template <typename A_T, typename B_T>
00040 inline static long used_stack(A_T A, B_T B)
00041 {
00042 if (stack_direction_negative)
00043 return (long) (A - B);
00044 else
00045 return (long) (B - A);
00046 }
00047
00048 extern size_t my_thread_stack_size;
00049
00050 bool check_stack_overrun(Session *session, long margin, void *)
00051 {
00052 long stack_used;
00053 if ((stack_used=used_stack(session->thread_stack,(char*) &stack_used)) >=
00054 (long) (my_thread_stack_size - margin))
00055 {
00056 my_printf_error(ER_STACK_OVERRUN_NEED_MORE, ER(ER_STACK_OVERRUN_NEED_MORE),
00057 MYF(ME_FATALERROR),
00058 stack_used,my_thread_stack_size,margin);
00059 return true;
00060 }
00061 return false;
00062 }
00063
00064 }