Hi, I'm trying to get a working version of libdispatch on macosx 10.6 to use its semaphores implementation on osx < 10.6. Compiled with xcode/gcc 4.2.1 (Apple Inc. build 5664)/10.6 SDK and apple semaphore optimizations. Unfortunately when I run the dispatch_sema.c test it fails: Starting program: /Users/Accounts/mirko/src/libdispatch/testing/a.out Reading symbols for shared libraries +. done ================================================== [TEST] Dispatch Semaphore [PID] 22816 ================================================== Program received signal EXC_BAD_INSTRUCTION, Illegal instruction/operand. [Switching to process 22816] 0x000045b8 in _dispatch_worker_thread (context=0x9550) at /Users/Accounts/mirko/src/libdispatch/src/queue.c:413 413 while (!(next = head->do_next)) { If I link the test with the system dispatch implementation it runs without problems. Is there a way to compile correctly the library? Thank you. -- Ciao, Mirko