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  • Committer: Brian Aker
  • Date: 2009-11-25 07:05:58 UTC
  • mfrom: (1192.3.39 pandora-build)
  • Revision ID: brian@gaz-20091125070558-mzf1m5etiwb841jb
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m4/pandora_have_gcc_atomics.m4
 
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dnl  Copyright (C) 2009 Sun Microsystems
 
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dnl This file is free software; Sun Microsystems
 
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dnl gives unlimited permission to copy and/or distribute it,
 
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dnl with or without modifications, as long as this notice is preserved.
 
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#--------------------------------------------------------------------
 
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# Check for GCC Atomic Support
 
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#--------------------------------------------------------------------
 
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AC_DEFUN([PANDORA_HAVE_GCC_ATOMICS],[
 
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  AC_CACHE_CHECK(
 
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    [whether the compiler provides atomic builtins],
 
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    [ac_cv_gcc_atomic_builtins],
 
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    [AC_RUN_IFELSE(
 
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      [AC_LANG_PROGRAM([],[[
 
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        int foo= -10; int bar= 10;
 
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        if (!__sync_fetch_and_add(&foo, bar) || foo)
 
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          return -1;
 
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        bar= __sync_lock_test_and_set(&foo, bar);
 
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        if (bar || foo != 10)
 
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          return -1;
 
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        bar= __sync_val_compare_and_swap(&bar, foo, 15);
 
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        if (bar)
 
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          return -1;
 
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        return 0;
 
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        ]])],
 
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      [ac_cv_gcc_atomic_builtins=yes],
 
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      [ac_cv_gcc_atomic_builtins=no])])
 
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  AS_IF([test "x$ac_cv_gcc_atomic_builtins" = "xyes"],[
 
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    AC_DEFINE(HAVE_GCC_ATOMIC_BUILTINS, 1,
 
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              [Define to 1 if compiler provides atomic builtins.])
 
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  ])
 
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])
 
 
b'\\ No newline at end of file'