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/*
* Copyright 2015-2016, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include <grpc++/completion_queue.h>
#include <memory>
#include <grpc++/impl/codegen/completion_queue_tag.h>
#include <grpc++/impl/grpc_library.h>
#include <grpc++/support/time.h>
#include <grpc/grpc.h>
#include <grpc/support/log.h>
namespace grpc {
static internal::GrpcLibraryInitializer g_gli_initializer;
CompletionQueue::CompletionQueue() {
g_gli_initializer.summon();
cq_ = grpc_completion_queue_create(nullptr);
}
CompletionQueue::CompletionQueue(grpc_completion_queue* take) : cq_(take) {}
CompletionQueue::~CompletionQueue() { grpc_completion_queue_destroy(cq_); }
void CompletionQueue::Shutdown() { grpc_completion_queue_shutdown(cq_); }
CompletionQueue::NextStatus CompletionQueue::AsyncNextInternal(
void** tag, bool* ok, gpr_timespec deadline) {
for (;;) {
auto ev = grpc_completion_queue_next(cq_, deadline, nullptr);
switch (ev.type) {
case GRPC_QUEUE_TIMEOUT:
return TIMEOUT;
case GRPC_QUEUE_SHUTDOWN:
return SHUTDOWN;
case GRPC_OP_COMPLETE:
auto cq_tag = static_cast<CompletionQueueTag*>(ev.tag);
*ok = ev.success != 0;
*tag = cq_tag;
if (cq_tag->FinalizeResult(tag, ok)) {
return GOT_EVENT;
}
break;
}
}
}
bool CompletionQueue::Pluck(CompletionQueueTag* tag) {
auto deadline = gpr_inf_future(GPR_CLOCK_REALTIME);
auto ev = grpc_completion_queue_pluck(cq_, tag, deadline, nullptr);
bool ok = ev.success != 0;
void* ignored = tag;
GPR_ASSERT(tag->FinalizeResult(&ignored, &ok));
GPR_ASSERT(ignored == tag);
// Ignore mutations by FinalizeResult: Pluck returns the C API status
return ev.success != 0;
}
void CompletionQueue::TryPluck(CompletionQueueTag* tag) {
auto deadline = gpr_time_0(GPR_CLOCK_REALTIME);
auto ev = grpc_completion_queue_pluck(cq_, tag, deadline, nullptr);
if (ev.type == GRPC_QUEUE_TIMEOUT) return;
bool ok = ev.success != 0;
void* ignored = tag;
// the tag must be swallowed if using TryPluck
GPR_ASSERT(!tag->FinalizeResult(&ignored, &ok));
}
} // namespace grpc
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