Tries to become the owner of the specified context,
as with g_main_context_acquire(). But if another thread
is the owner, atomically drop @mutex and wait on @cond until
that owner releases ownership or until @cond is signaled, then
try again (once) to become the owner.
Tries to become the owner of the specified context, as with g_main_context_acquire(). But if another thread is the owner, atomically drop @mutex and wait on @cond until that owner releases ownership or until @cond is signaled, then try again (once) to become the owner.