Mercurial > sdl-ios-xcode
changeset 5069:fd125217f00c
Separated out the minimum functionality that we need from gcc for our spinlock fallback.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Fri, 21 Jan 2011 21:42:04 -0800 |
| parents | 231dbbc3e31c |
| children | 042ad5e274ed |
| files | configure.in include/SDL_config.h.in src/atomic/SDL_spinlock.c |
| diffstat | 3 files changed, 14 insertions(+), 1 deletions(-) [+] |
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--- a/configure.in Fri Jan 21 21:35:43 2011 -0800 +++ b/configure.in Fri Jan 21 21:42:04 2011 -0800 @@ -312,6 +312,18 @@ 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
--- a/include/SDL_config.h.in Fri Jan 21 21:35:43 2011 -0800 +++ b/include/SDL_config.h.in Fri Jan 21 21:42:04 2011 -0800 @@ -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
--- a/src/atomic/SDL_spinlock.c Fri Jan 21 21:35:43 2011 -0800 +++ b/src/atomic/SDL_spinlock.c Fri Jan 21 21:42:04 2011 -0800 @@ -36,7 +36,7 @@ #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__)