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Separated out the minimum functionality that we need from gcc for our…

… spinlock fallback.
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slouken committed Jan 22, 2011
1 parent a24cc7f commit d7e6145acd3d2dba597f69c2679538fe8751cdf0
Showing with 14 additions and 1 deletion.
  1. +12 −0 configure.in
  2. +1 −0 include/SDL_config.h.in
  3. +1 −1 src/atomic/SDL_spinlock.c
@@ -312,6 +312,18 @@ if test x$enable_gcc_atomics = xyes; then
if test x$have_gcc_atomics = xyes; then
AC_DEFINE(HAVE_GCC_ATOMICS)
fi

# See if we have the minimum operation needed for GCC atomics
AC_TRY_LINK([
],[
int a;
__sync_lock_test_and_set(&a, 1);
],[
have_gcc_sync_lock_test_and_set=yes
])
if test x$have_gcc_sync_lock_test_and_set = xyes; then
AC_DEFINE(HAVE_GCC_SYNC_LOCK_TEST_AND_SET)
fi
fi

# Standard C sources
@@ -59,6 +59,7 @@
#undef SIZEOF_VOIDP
#undef SDL_HAS_64BIT_TYPE
#undef HAVE_GCC_ATOMICS
#undef HAVE_GCC_SYNC_LOCK_TEST_AND_SET

/* Comment this if you want to build without any C library requirements */
#undef HAVE_LIBC
@@ -36,7 +36,7 @@ SDL_AtomicTryLock(SDL_SpinLock *lock)
#elif defined(__MACOSX__)
return OSAtomicCompareAndSwap32Barrier(0, 1, lock);

#elif defined(HAVE_GCC_ATOMICS)
#elif defined(HAVE_GCC_SYNC_LOCK_TEST_AND_SET)
return (__sync_lock_test_and_set(lock, 1) == 0);

#elif defined(__GNUC__) && defined(__arm__) && defined(__ARM_ARCH_5__)

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