gmain: only signal GWakeup right before or during a blocking poll
Since commit e4ee3079 ("Do not wake up main loop if change is from same thread", bug 761102), GMainContext uses context->owner to decide if the event loop is being run in the current thread. However, what really matters is the phase in the prepare/query/poll/check/dispatch sequence. Wakeups are only needed between the end of prepare and the end of poll, and then only if prepare found that no sources were ready. There is no need to take threads into account, because prepare, check and all callers of conditional_wakeup all look at the new need_wakeup flag inside LOCK_CONTEXT/UNLOCK_CONTEXT. With this change, g_main_context_is_owner and g_main_context_wait are the only functions for which acquire/release matters, just like before commit e4ee3079 . Signed-off-by:Paolo Bonzini <bonzini@gnu.org>
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