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Issue #22038: pyatomic.h now uses stdatomic.h or GCC built-in functions for

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atomic memory access if available. Patch written by Vitor de Lima and Gustavo
Temple.
This commit is contained in:
Victor Stinner 2015-01-09 02:13:19 +01:00
parent b551fac136
commit 4f5366e65a
6 changed files with 193 additions and 3 deletions
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65
configure vendored
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@ -15703,6 +15703,71 @@ $as_echo "#define HAVE_IPA_PURE_CONST_BUG 1" >>confdefs.h
esac
fi
# Check for stdatomic.h
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for stdatomic.h" >&5
$as_echo_n "checking for stdatomic.h... " >&6; }
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
#include <stdatomic.h>
_Atomic int value = ATOMIC_VAR_INIT(1);
int main() {
int loaded_value = atomic_load(&value);
return 0;
}
_ACEOF
if ac_fn_c_try_link "$LINENO"; then :
have_stdatomic_h=yes
else
have_stdatomic_h=no
fi
rm -f core conftest.err conftest.$ac_objext \
conftest$ac_exeext conftest.$ac_ext
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $have_stdatomic_h" >&5
$as_echo "$have_stdatomic_h" >&6; }
if test "$have_stdatomic_h" = yes; then
$as_echo "#define HAVE_STD_ATOMIC 1" >>confdefs.h
fi
# Check for GCC >= 4.7 __atomic builtins
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for GCC >= 4.7 __atomic builtins" >&5
$as_echo_n "checking for GCC >= 4.7 __atomic builtins... " >&6; }
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
volatile int val = 1;
int main() {
__atomic_load_n(&val, __ATOMIC_SEQ_CST);
return 0;
}
_ACEOF
if ac_fn_c_try_link "$LINENO"; then :
have_builtin_atomic=yes
else
have_builtin_atomic=no
fi
rm -f core conftest.err conftest.$ac_objext \
conftest$ac_exeext conftest.$ac_ext
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $have_builtin_atomic" >&5
$as_echo "$have_builtin_atomic" >&6; }
if test "$have_builtin_atomic" = yes; then
$as_echo "#define HAVE_BUILTIN_ATOMIC 1" >>confdefs.h
fi
# ensurepip option
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for ensurepip" >&5
$as_echo_n "checking for ensurepip... " >&6; }