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Implement __sync_fetch_and_add_4 if necessary. 

From-SVN: r169820
This commit is contained in:
Ian Lance Taylor 2011-02-04 00:49:47 +00:00
parent 6dc5461821
commit 084996f1d1
4 changed files with 79 additions and 0 deletions
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4
libgo/config.h.in
View File

@ -43,6 +43,10 @@
function for uint32 */
#undef HAVE_SYNC_BOOL_COMPARE_AND_SWAP_4
/* Define to 1 if the compiler provides the __sync_fetch_and_add function for
uint32 */
#undef HAVE_SYNC_FETCH_AND_ADD_4
/* Define to 1 if you have the <syscall.h> header file. */
#undef HAVE_SYSCALL_H

29
libgo/configure vendored
View File

@ -14206,6 +14206,35 @@ $as_echo "#define HAVE_SYNC_BOOL_COMPARE_AND_SWAP_4 1" >>confdefs.h
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for __sync_fetch_and_add_4" >&5
$as_echo_n "checking for __sync_fetch_and_add_4... " >&6; }
if test "${libgo_cv_func___sync_fetch_and_add_4+set}" = set; then :
$as_echo_n "(cached) " >&6
else
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
typedef unsigned int uint32 __attribute__ ((mode (SI)));
uint32 i;
int main() { return __sync_fetch_and_add (&i, 1); }
_ACEOF
if ac_fn_c_try_link "$LINENO"; then :
libgo_cv_func___sync_fetch_and_add_4=yes
else
libgo_cv_func___sync_fetch_and_add_4=no
fi
rm -f core conftest.err conftest.$ac_objext \
conftest$ac_exeext conftest.$ac_ext
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libgo_cv_func___sync_fetch_and_add_4" >&5
$as_echo "$libgo_cv_func___sync_fetch_and_add_4" >&6; }
if test "$libgo_cv_func___sync_fetch_and_add_4" = "yes"; then
$as_echo "#define HAVE_SYNC_FETCH_AND_ADD_4 1" >>confdefs.h
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether compiler supports -minline-all-stringops" >&5
$as_echo_n "checking whether compiler supports -minline-all-stringops... " >&6; }
if test "${libgo_cv_c_stringops+set}" = set; then :

14
libgo/configure.ac
View File

@ -396,6 +396,20 @@ if test "$libgo_cv_func___sync_bool_compare_and_swap_4" = "yes"; then
[Define to 1 if the compiler provides the __sync_bool_compare_and_swap function for uint32])
fi
AC_CACHE_CHECK([for __sync_fetch_and_add_4],
[libgo_cv_func___sync_fetch_and_add_4],
[AC_LINK_IFELSE([
typedef unsigned int uint32 __attribute__ ((mode (SI)));
uint32 i;
int main() { return __sync_fetch_and_add (&i, 1); }
],
[libgo_cv_func___sync_fetch_and_add_4=yes],
[libgo_cv_func___sync_fetch_and_add_4=no])])
if test "$libgo_cv_func___sync_fetch_and_add_4" = "yes"; then
AC_DEFINE(HAVE_SYNC_FETCH_AND_ADD_4, 1,
[Define to 1 if the compiler provides the __sync_fetch_and_add function for uint32])
fi
dnl For x86 we want to use the -minline-all-stringops option to avoid
dnl forcing a stack split when calling memcpy and friends.
AC_CACHE_CHECK([whether compiler supports -minline-all-stringops],

32
libgo/runtime/go-semacquire.c
View File

@ -117,3 +117,35 @@ semrelease (uint32 *addr)
__go_assert (i == 0);
}
}
#ifndef HAVE_SYNC_FETCH_AND_ADD_4
/* For targets which don't have the required sync support. Really
this should be provided by gcc itself. FIXME. */
static pthread_mutex_t sync_lock = PTHREAD_MUTEX_INITIALIZER;
uint32
__sync_fetch_and_add_4(uint32*, uint32)
__attribute__((visibility("hidden")));
uint32
__sync_fetch_and_add_4(uint32* ptr, uint32 add)
{
int i;
uint32 ret;
i = pthread_mutex_lock(&sync_lock);
__go_assert(i == 0);
ret = *ptr;
*ptr += add;
i = pthread_mutex_unlock(&sync_lock);
__go_assert(i == 0);
return ret;
}
#endif