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Program hangs when dlclose() DSP stub shared library
thlin
Join Date: 27 Mar 16
Posts: 1
Posted: Thu, 2016-05-19 07:55
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Hello everyone,
 
I am using Hexagon SDK 2.0 on DragonBoard 810 bought from Intrinsyc Technologies.
I follow the instructions in Hexagon SDK document(${SDK_ROOT}\docs\Examples_Computer-Vision.html) and run cornerApp(${SDK_ROOT}\examples\fastcv\cornerApp) on DragonBoard 810 success.
But I found if I compile the cornerApp as a shared library(cornerApp.so) and write a simple program dlopen this shared library, I will get hang when dlclose().
The following simple modifications can reproduce the error:
1.Modify android.min: cornerApp build as shared library, build src/foo.c as executable
  1. # stub library  
  2. BUILD_DLLS += libcornerApp  
  3.   
  4. libcornerApp_QAICIDLS += \  
  5.    inc/cornerApp \  
  6.    $(MAKE_D_DSPCV_INCDIR)/dspCV \  
  7.   
  8. libcornerApp_C_SRCS += \  
  9.   $V/cornerApp_stub \  
  10.   $V/dspCV_stub \  
  11.   
  12. libcornerApp_DLLS += libadsprpc  
  13.   
  14. # stand-alone corner-detection executable  
  15. BUILD_DLLS += cornerApp  
  16.   
  17. cornerApp_QAICIDLS += \  
  18.  inc/cornerApp \  
  19.  $(MAKE_D_DSPCV_INCDIR)/dspCV \  
  20.   
  21. cornerApp_C_SRCS += src/cornerApp  
  22. cornerApp_LIBS += rpcmem  
  23. cornerApp_DLLS += libcornerApp \  
  24.                 libadsprpc \  
  25.                   
  26. cornerApp_LD_FLAGS += -llog  
  27. cornerApp_DEFINES += VERIFY_PRINT_ERROR  
  28.   
  29. BUILD_EXES += dlopen_test  
  30. dlopen_test_C_SRCS += src/foo  
  31. dlopen_test_LD_FLAGS += -ldl  
  32.   
  33. # copy final build products to the ship directory  
  34. BUILD_COPIES = \  
  35.    $(DLLS) \  
  36.    $(EXES) \  
  37.    $(LIBS) \  
  38.    $(SHIP_DIR)/ ;  
2.Add src/foo.c:
  1. #include <stdlib.h>  
  2. #include <stdio.h>  
  3. #include <dlfcn.h>  
  4.   
  5. int main(int argc, char **argv)   
  6. {  
  7.     void *handle;  
  8.     int (*test_main_start)(int argc, char* argv[]);  
  9.     char *error;  
  10.   
  11.     handle = dlopen ("cornerApp.so", RTLD_LAZY);  
  12.     if (!handle) {  
  13.         fputs (dlerror(), stderr);  
  14.         exit(1);  
  15.     }  
  16.   
  17.     test_main_start = dlsym(handle, "test_main_start");  
  18.     if ((error = (char *)dlerror()) != NULL)  {  
  19.         fputs(error, stderr);  
  20.         exit(1);  
  21.     }  
  22.   
  23.     printf ("test_main_start returned %d\n", (*test_main_start)(argc, argv));  
  24.     dlclose(handle);  
  25.     return 0;  
  26. } 

 

Does anyone know how to solve this problem?

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