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| author | Rickard Green <[email protected]> | 2010-06-01 13:51:34 +0000 |
|---|---|---|
| committer | Erlang/OTP <[email protected]> | 2010-06-01 13:51:34 +0000 |
| commit | c68f1802ce375c3425795671c74c6b3fd9c3a8ef (patch) | |
| tree | b2fbb14797c866cc1470f85dbc6382cf586150d4 /erts/aclocal.m4 | |
| parent | b53f8a67649a371a38dc6d97b0dfe52111236a3e (diff) | |
| download | otp-c68f1802ce375c3425795671c74c6b3fd9c3a8ef.tar.gz otp-c68f1802ce375c3425795671c74c6b3fd9c3a8ef.tar.bz2 otp-c68f1802ce375c3425795671c74c6b3fd9c3a8ef.zip | |
OTP-8659 Add ethread support for gcc atomics
Support for using gcc's built-in functions for atomic memory access has
been added. This functionallity will be used if available and no other
native atomic implementation in ERTS is available.
Diffstat (limited to 'erts/aclocal.m4')
| -rw-r--r-- | erts/aclocal.m4 | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/erts/aclocal.m4 b/erts/aclocal.m4 index 3d935b7295..6a92fa5653 100644 --- a/erts/aclocal.m4 +++ b/erts/aclocal.m4 @@ -843,6 +843,23 @@ case "$THR_LIB_NAME" in AC_DEFINE(ETHR_HAVE_PTHREAD_ATTR_SETGUARDSIZE, 1, \ [Define if you have the pthread_attr_setguardsize function.])) + AC_MSG_CHECKING([for GCC atomic operations]) + ethr_have_gcc_atomic_ops=no + AC_TRY_LINK([], + [ + long res; + volatile long val; + res = __sync_val_compare_and_swap(&val, (long) 1, (long) 0); + res = __sync_add_and_fetch(&val, (long) 1); + res = __sync_sub_and_fetch(&val, (long) 1); + res = __sync_fetch_and_and(&val, (long) 1); + res = __sync_fetch_and_or(&val, (long) 1); + ], + [ethr_have_native_atomics=yes + ethr_have_gcc_atomic_ops=yes]) + AC_MSG_RESULT([$ethr_have_gcc_atomic_ops]) + test $ethr_have_gcc_atomic_ops = yes && AC_DEFINE(ETHR_HAVE_GCC_ATOMIC_OPS, 1, [Define if you have gcc atomic operations]) + dnl Restore LIBS LIBS=$saved_libs dnl restore CPPFLAGS @@ -873,6 +890,17 @@ if test "X$disable_native_ethr_impls" = "Xyes"; then AC_DEFINE(ETHR_DISABLE_NATIVE_IMPLS, 1, [Define if you want to disable native ethread implementations]) fi +AC_ARG_ENABLE(prefer-gcc-native-ethr-impls, + AS_HELP_STRING([--enable-prefer-gcc-native-ethr-impls], + [enable prefer gcc native ethread implementations]), +[ case "$enableval" in + yes) enable_prefer_gcc_native_ethr_impls=yes ;; + *) enable_prefer_gcc_native_ethr_impls=no ;; + esac ], enable_prefer_gcc_native_ethr_impls=no) + +test $enable_prefer_gcc_native_ethr_impls = yes && + AC_DEFINE(ETHR_PREFER_GCC_NATIVE_IMPLS, 1, [Define if you prefer gcc native ethread implementations]) + AC_DEFINE(ETHR_HAVE_ETHREAD_DEFINES, 1, \ [Define if you have all ethread defines]) |