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Check if atomic operations are supported

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This commit is contained in:
Frank Denis 2016-12-16 16:37:12 +01:00
parent 4c6f704084
commit db97a35502
2 changed files with 12 additions and 1 deletions
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11
configure.ac
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@ -660,6 +660,17 @@ AS_IF([test "x$aligned_access_required" = "xyes"],
[AC_MSG_RESULT(no) [AC_MSG_RESULT(no)
AC_DEFINE([CPU_UNALIGNED_ACCESS], [1], [unaligned memory access is supported])]) AC_DEFINE([CPU_UNALIGNED_ACCESS], [1], [unaligned memory access is supported])])
AC_MSG_CHECKING(if atomic operations are supported)
AC_LINK_IFELSE([AC_LANG_PROGRAM([[ ]], [[
static volatile int _sodium_lock;
__sync_lock_test_and_set(&_sodium_lock, 1);
__sync_lock_release(&_sodium_lock);
]]
)],
[AC_MSG_RESULT(yes)
AC_DEFINE([HAVE_ATOMIC_OPS], [1], [atomic operations are supported])],
[AC_MSG_RESULT(no)])
dnl Checks for functions and headers dnl Checks for functions and headers
AS_IF([test "x$EMSCRIPTEN" = "x"],[ AS_IF([test "x$EMSCRIPTEN" = "x"],[

2
src/libsodium/sodium/core.c
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@ -123,7 +123,7 @@ sodium_crit_leave(void)
return 0; return 0;
} }
#elif defined(__GNUC__) && !defined(__EMSCRIPTEN__) && !defined(__native_client__) #elif defined(HAVE_ATOMIC_OPS) && !defined(__EMSCRIPTEN__) && !defined(__native_client__)
static volatile int _sodium_lock; static volatile int _sodium_lock;