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mmb force_push 出现竞争时，应该在失败后先正常push一次

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mutouyun 2021-01-09 21:42:56 +08:00
parent 2ea7535256
commit 8e6ae4220b
1 changed files with 8 additions and 3 deletions
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9
src/libipc/prod_cons.h
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@ -376,10 +376,15 @@ struct prod_cons_impl<wr<relat::multi, relat::multi, trans::broadcast>> {
}
// just compare & exchange
if (el->rc_.compare_exchange_weak(
cur_rc, inc_mask(epoch | (cur_rc & ep_mask)) | static_cast<rc_t>(cc), std::memory_order_relaxed) &&
epoch_.compare_exchange_weak(epoch, epoch, std::memory_order_acq_rel)) {
cur_rc, inc_mask(epoch | (cur_rc & ep_mask)) | static_cast<rc_t>(cc), std::memory_order_relaxed)) {
if (epoch == epoch_.load(std::memory_order_acquire)) {
break;
}
else if (push(wrapper, std::forward<F>(f), elems)) {
return true;
}
epoch = epoch_.fetch_add(ep_incr, std::memory_order_release) + ep_incr;
}
ipc::yield(k);
}
// only one thread/process would touch here at one time