In this case the name is resolved within the current process. The full path to the library may also be specified.Ī function name may be used alone in place of the tuple (just :function or "function"). Shared libraries available in the (platform-specific) load path will be resolved by name. Shared libraries and functions are referenced by a tuple of the form (:function, "library") or ("function", "library") where function is the C-exported function name, and library refers to the shared library name. The machine instructions generated by Julia's JIT are the same as a native C call would be, so the resulting overhead is the same as calling a library function from C code. Most C and Fortran libraries ship compiled as shared libraries already, but if you are compiling the code yourself using GCC (or Clang), you will need to use the -shared and -fPIC options. The code to be called must be available as a shared library. This is accomplished just by making an appropriate call with ccall syntax, which looks like an ordinary function call. Julia has a "no boilerplate" philosophy: functions can be called directly from Julia without any "glue" code, code generation, or compilation – even from the interactive prompt. To allow easy use of this existing code, Julia makes it simple and efficient to call C and Fortran functions. Though most code can be written in Julia, there are many high-quality, mature libraries for numerical computing already written in C and Fortran. Edit on GitHub Calling C and Fortran Code
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