gcc/fortran/doc/gfortran/compiler-characteristics/asynchronous-i-o.rst

   1 ..
   2   Copyright 1988-2022 Free Software Foundation, Inc.
   3   This is part of the GCC manual.
   4   For copying conditions, see the copyright.rst file.
   5
   6 .. index:: input/output, asynchronous, asynchronous I/O
   7
   8 .. _asynchronous-i-o:
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  10 Asynchronous I/O
  11 ****************
  12
  13 Asynchronous I/O is supported if the program is linked against the
  14 POSIX thread library. If that is not the case, all I/O is performed
  15 as synchronous. On systems which do not support pthread condition
  16 variables, such as AIX, I/O is also performed as synchronous.
  17
  18 On some systems, such as Darwin or Solaris, the POSIX thread library
  19 is always linked in, so asynchronous I/O is always performed. On other
  20 sytems, such as Linux, it is necessary to specify :option:`-pthread`,
  21 :option:`-lpthread` or :option:`-fopenmp` during the linking step.