C mex s-function caused Segmentation violation to matlan crash

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i am new on the C mex s-function. any help are appreciated.

The following C file is compiled OK, and the first time run in Simulink is Ok. but the third time simulation will cause a Segmentation violation.

The error message is

MATLAB crash file:C:\DOCUME~1\FM\LOCALS~1\Temp\matlab_crash_dump.5024:
------------------------------------------------------------------------
       Segmentation violation detected at Fri Apr 13 19:52:37 2012
------------------------------------------------------------------------
Configuration:
  MATLAB Version:   7.11.0.584 (R2010b)
  MATLAB License:   161051
  Operating System: Microsoft Windows XP
  Window System:    Version 5.1 (Build 2600: Service Pack 3)
  Processor ID:     x86 Family 6 Model 7 Stepping 10, GenuineIntel
  Virtual Machine:  Java 1.6.0_17-b04 with Sun Microsystems Inc. Java HotSpot(TM) Client VM mixed mode
  Default Encoding:  windows-1252
Fault Count: 1
Abnormal termination:
Register State (captured):
  EAX = 00000000  EBX = 78859114
  ECX = 00c29904  EDX = 1fe8cd28
  ESP = 00c29900  EBP = 00c29c14
  ESI = 7888e74c  EDI = 00c29bd4
    EIP = 787f80a3  EFL = 00200246
     CS = 0000001b   DS = 8fc60023   SS = f71f0023
     ES = 02120023   FS = 0000003b   GS = 02750000
  Stack Trace (captured):
  [  0] 0x787f80a3 C:/Program Files/MATLAB/R2010b/bin/win32/libmwfl.dll+00098467 ( fl::diag::stacktrace_base::format+005555 )
  [  1] 0x787f8453 C:/Program Files/MATLAB/R2010b/bin/win32/libmwfl.dll+00099411 ( fl::diag::terminate_log+000035 )
  [  2] 0x7a403f5c   C:/Program Files/MATLAB/R2010b/bin/win32/mcr.dll+00278364 ( mnSetCmdLineArg+000636 )
  [  3] 0x78138e5f C:/WINDOWS/WinSxS/x86_Microsoft.VC80.CRT_1fc8b3b9a1e18e3b_8.0.50727.6195_x-ww_44262b86/MSVCR80.dll+00036447 ( XcptFilter+000335 )
  [  4] 0x0040687f C:/Program Files/MATLAB/R2010b/bin/win32/MATLAB.exe+00026751 ( ???+000335 )
  [  5] 0x7c817077                   C:/WINDOWS/system32/kernel32.dll+00094327 ( RegisterWaitForInputIdle+000073 )
    my c file is