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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#include "librbd/asio/ContextWQ.h"
#include "include/Context.h"
#include "common/Cond.h"
#include "common/dout.h"
#define dout_subsys ceph_subsys_rbd
#undef dout_prefix
#define dout_prefix *_dout << "librbd::asio::ContextWQ: " \
<< this << " " << __func__ << ": "
namespace librbd {
namespace asio {
ContextWQ::ContextWQ(CephContext* cct, boost::asio::io_context& io_context)
: m_cct(cct), m_io_context(io_context),
m_strand(std::make_unique<boost::asio::io_context::strand>(io_context)),
m_queued_ops(0) {
ldout(m_cct, 20) << dendl;
}
ContextWQ::~ContextWQ() {
ldout(m_cct, 20) << dendl;
drain();
m_strand.reset();
}
void ContextWQ::drain() {
ldout(m_cct, 20) << dendl;
C_SaferCond ctx;
drain_handler(&ctx);
ctx.wait();
}
void ContextWQ::drain_handler(Context* ctx) {
if (m_queued_ops == 0) {
ctx->complete(0);
return;
}
// new items might be queued while we are trying to drain, so we
// might need to post the handler multiple times
boost::asio::post(*m_strand, [this, ctx]() { drain_handler(ctx); });
}
} // namespace asio
} // namespace librbd
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