Hi Tomek,
On Wed, 2009-07-22 at 13:03 +0200, Tomek Grabiec wrote:
> @@ -2024,25 +2024,16 @@ static void invoke(struct basic_block *s, struct
> tree_node *tree, struct compila
> struct insn *call_insn;
> void *target;
>
> - if (pthread_mutex_trylock(&cu->mutex)) {
> - /*
> - * This is a recursive method invocation. Threfore, we are
> - * already holding cu->mutex here because we entered
> - * instruction selection through jit_magic_trampoline().
> - */
> - is_compiled = false;
> + /*
> + * We can't use vm_method_call_ptr() here because we
> + * later add fixup sites depending on whether target is
> + * trampoline or native.
> + */
> + is_compiled = cu->is_compiled;
> + if (is_compiled)
> + target = vm_method_native_ptr(method);
> + else
> target = vm_method_trampoline_ptr(method);
> - } else {
> - is_compiled = cu->is_compiled;
> -
> - if (is_compiled)
> - target = vm_method_native_ptr(method);
> - else
> - target = vm_method_trampoline_ptr(method);
> -
> - pthread_mutex_unlock(&cu->mutex);
> - }
As I explained on IRC: you can't remove locking here. First of all, the
nobody is protecting the read to ->is_compiled but even worse, there's
no guarantee that the write to ->native_ptr is visible after
->is_compiled is.
Pekka
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