graphicsmagick bugs in multi threads programs

hi,all:
        I find GraphicsMagick doesn't work well if the program self is multi thread。The CPU is only 200%  （my computer is 16 core).
       The C++ API of GraphicsMagick is not working when  users program  is  multi thread，openMP in GraphicsMagick  is not like  paralle process.


My test GraphicsMagick versions are :1.3.18 ,1.3.17 ,1.3.16
single threads test case is like:

#include <stdlib.h>
#include <string.h>
#include <iostream>
#include <magick/api.h>
#include <boost/thread/thread.hpp>
using namespace std;


void exec(const char *pic) {
  char outfile[MaxTextExtent];
  (void) strncpy( outfile, "resize.jpg", MaxTextExtent-1 );
  ExceptionInfo exception;
  Image *image,
        *resize_image;


  ImageInfo  *image_info;


  GetExceptionInfo(&exception);
  while(1) {
    image_info = CloneImageInfo((ImageInfo *) NULL);
    (void) strcpy(image_info->filename, pic);
    image = ReadImage(image_info, &exception);
    if (exception.severity != UndefinedException)
      CatchException(&exception);
    resize_image = ResizeImage(image, 100, 200, LanczosFilter, 1.0, &exception);
    DestroyImage(image);
    if (resize_image == (Image *) NULL) {
      CatchException(&exception);
    } else {
      resize_image->filename[MaxTextExtent-1] = '\0';
      (void) strncpy(resize_image->filename, outfile, MaxTextExtent-1);
      (void) WriteImage (image_info, resize_image);
    }
  }
  DestroyImageInfo(image_info);
  DestroyExceptionInfo(&exception);
  DestroyMagick();
}

int main(int argc, char** argv) {
  InitializeMagick(NULL);
  boost::thread thrd1(&exec, "1.jpg");
  thrd1.join();
  return 0;
}




multi threads test case is like :


#include <stdlib.h>
#include <string.h>
#include <iostream>
#include <magick/api.h>
#include <boost/thread/thread.hpp>
using namespace std;


void exec(const char *pic) {
  char outfile[MaxTextExtent];
  (void) strncpy( outfile, "resize.jpg", MaxTextExtent-1 );
  ExceptionInfo exception;
  Image *image,
        *resize_image;


  ImageInfo  *image_info;


  GetExceptionInfo(&exception);
  while(1) {
    image_info = CloneImageInfo((ImageInfo *) NULL);
    (void) strcpy(image_info->filename, pic);
    image = ReadImage(image_info, &exception);
    if (exception.severity != UndefinedException)
      CatchException(&exception);
    resize_image = ResizeImage(image, 100, 200, LanczosFilter, 1.0, &exception);
    DestroyImage(image);
    if (resize_image == (Image *) NULL) {
      CatchException(&exception);
    } else {
      resize_image->filename[MaxTextExtent-1] = '\0';
      (void) strncpy(resize_image->filename, outfile, MaxTextExtent-1);
      (void) WriteImage (image_info, resize_image);
    }
  }
  DestroyImageInfo(image_info);
  DestroyExceptionInfo(&exception);
  DestroyMagick();
}

int main(int argc, char** argv) {
  InitializeMagick(NULL);
  boost::thread thrd1(&exec, "1.jpg");
  boost::thread thrd2(&exec, "2.jpg");
  thrd1.join();
  thrd2.join();
  return 0;
}







use C++API test case is like:


#include <iostream>
#include <GraphicsMagick/Magick++.h>
#include <boost/thread/thread.hpp>
using namespace std;
using namespace Magick;


void exec(const char* pic) {
  Image image;
  while (1)
  try {
    int width = 100;
    int height = 200;
    image.read(pic);
    char param_scale[64];
    sprintf(param_scale,"%dx%d!",width,height);
    image.scale(Magick::Geometry(param_scale));
    image.write("self.jpg");
  } catch(Exception &error_) {
    cout << "Caught exception: " << error_.what() << endl;
  }


}
int main(int argc, char **argv) {
  InitializeMagick(*argv);
  boost::thread thrd1(&exec, "1.jpg");
  boost::thread thrd2(&exec, "2.jpg");
  boost::thread thrd3(&exec, "3.jpg");
  boost::thread thrd4(&exec, "4.jpg");
  thrd1.join();
  thrd2.join();
  thrd3.join();
  thrd4.join();


  return 0;
}

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