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Thread Safety (libffi: the portable foreign function interface library)

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2.7 Thread Safety

libffi is not completely thread-safe. However, many parts are, and if you follow some simple rules, you can use it safely in a multi-threaded program.

  • ffi_prep_cif may modify the ffi_type objects passed to it. It is best to ensure that only a single thread prepares a given ffi_cif at a time.
  • On some platforms, ffi_prep_cif may modify the size and alignment of some types, depending on the chosen ABI. On these platforms, if you switch between ABIs, you must ensure that there is only one call to ffi_prep_cif at a time.

    Currently the only affected platform is PowerPC and the only affected type is long double.


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