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Separated out the minimum functionality that we need from gcc for our spinlock fallback.

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This commit is contained in:
Sam Lantinga 2011-01-21 21:42:04 -08:00
parent 68afef61c9
commit 2c31531800
3 changed files with 14 additions and 1 deletions
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12
configure.in
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@ -312,6 +312,18 @@ if test x$enable_gcc_atomics = xyes; then
if test x$have_gcc_atomics = xyes; then if test x$have_gcc_atomics = xyes; then
AC_DEFINE(HAVE_GCC_ATOMICS) AC_DEFINE(HAVE_GCC_ATOMICS)
fi fi
# See if we have the minimum operation needed for GCC atomics
AC_TRY_LINK([
],[
int a;
__sync_lock_test_and_set(&a, 1);
],[
have_gcc_sync_lock_test_and_set=yes
])
if test x$have_gcc_sync_lock_test_and_set = xyes; then
AC_DEFINE(HAVE_GCC_SYNC_LOCK_TEST_AND_SET)
fi
fi fi
# Standard C sources # Standard C sources

1
include/SDL_config.h.in
View file

@ -59,6 +59,7 @@
#undef SIZEOF_VOIDP #undef SIZEOF_VOIDP
#undef SDL_HAS_64BIT_TYPE #undef SDL_HAS_64BIT_TYPE
#undef HAVE_GCC_ATOMICS #undef HAVE_GCC_ATOMICS
#undef HAVE_GCC_SYNC_LOCK_TEST_AND_SET
/* Comment this if you want to build without any C library requirements */ /* Comment this if you want to build without any C library requirements */
#undef HAVE_LIBC #undef HAVE_LIBC

2
src/atomic/SDL_spinlock.c
View file

@ -36,7 +36,7 @@ SDL_AtomicTryLock(SDL_SpinLock *lock)
#elif defined(__MACOSX__) #elif defined(__MACOSX__)
return OSAtomicCompareAndSwap32Barrier(0, 1, lock); 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); return (__sync_lock_test_and_set(lock, 1) == 0);
#elif defined(__GNUC__) && defined(__arm__) && defined(__ARM_ARCH_5__) #elif defined(__GNUC__) && defined(__arm__) && defined(__ARM_ARCH_5__)