c++ - Magick++ segfaults in thread -

Write a scanning program After reading an image, call this convertToPDF () and then the next The image reads program seg defect ( running is finished; segmentation error: 11; ) when the image is declared in the thread. The only code works fine when running in the main thread; I was taken from thrPDF to convertToPDF to ensure that I'm thinking that Magic ++ It is something to do with memory allocation that is on my head. Any help will be very much appreciated.

  Zero Scan Window :: ConvertTOPDF (String Filename) {Convert Pthread_t; String * args = new string (fileName); Zero * thrPDF (Zero *); Pthread_create (& convert, zero, thrPDF, args); } Zero * thrPDF (Zero * A) {string * fName = (string *) A; String newfile = fName-> Substr (0, fName-> height () - 3) + "pdf"; Magic :: Image img (* f annaam); // This line is that img.magick ("pdf") fault fault; Img.write (newFile); Pthread_exit (0); }   
 Here is the call stack: 
 omp_get_max_threads (?) 
 GetOpenMPMaximumThreads inlined 
 AcquirePixelCache (?) 
 Receive (?) 
 Magick :: ImageRef :: ImageRef (?) 
 Magick :: Image :: Image (?) 
 thrPDF (?) 
 _pthread_start (?) 
 thread_start (?)   < P> 
 
 If it has not already been done, you should initializeMagick (NULL) (or InitializeMagick (* argv)) in your main / original thread. To start using the rest of the API in the past, it can help to fix some issues related to threading. Magical ++ is included with graphics magic, this is a complete requirement in modern releases.