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-rw-r--r--src/core/iomgr/pollset.h7
-rw-r--r--src/core/iomgr/pollset_multipoller_with_epoll.c2
-rw-r--r--src/core/iomgr/pollset_multipoller_with_poll_posix.c2
-rw-r--r--src/core/iomgr/pollset_posix.c31
-rw-r--r--src/core/iomgr/pollset_posix.h9
-rw-r--r--src/core/iomgr/pollset_windows.c9
-rw-r--r--src/core/security/google_default_credentials.c2
-rw-r--r--src/core/surface/completion_queue.c24
-rw-r--r--src/cpp/server/server.cc104
-rw-r--r--src/cpp/server/server_builder.cc29
10 files changed, 142 insertions, 77 deletions
diff --git a/src/core/iomgr/pollset.h b/src/core/iomgr/pollset.h
index c474e4dbf1..337596cb74 100644
--- a/src/core/iomgr/pollset.h
+++ b/src/core/iomgr/pollset.h
@@ -74,10 +74,9 @@ void grpc_pollset_destroy(grpc_pollset *pollset);
grpc_pollset_work, and it is guaranteed that GRPC_POLLSET_MU(pollset) will
not be released by grpc_pollset_work AFTER worker has been destroyed.
- Returns true if some work has been done, and false if the deadline
- expired. */
-int grpc_pollset_work(grpc_pollset *pollset, grpc_pollset_worker *worker,
- gpr_timespec deadline);
+ Tries not to block past deadline. */
+void grpc_pollset_work(grpc_pollset *pollset, grpc_pollset_worker *worker,
+ gpr_timespec now, gpr_timespec deadline);
/* Break one polling thread out of polling work for this pollset.
If specific_worker is GRPC_POLLSET_KICK_BROADCAST, kick ALL the workers.
diff --git a/src/core/iomgr/pollset_multipoller_with_epoll.c b/src/core/iomgr/pollset_multipoller_with_epoll.c
index 1320c64579..4d41db074d 100644
--- a/src/core/iomgr/pollset_multipoller_with_epoll.c
+++ b/src/core/iomgr/pollset_multipoller_with_epoll.c
@@ -181,7 +181,7 @@ static void multipoll_with_epoll_pollset_maybe_work(
pfds[1].events = POLLIN;
pfds[1].revents = 0;
- poll_rv = poll(pfds, 2, timeout_ms);
+ poll_rv = grpc_poll_function(pfds, 2, timeout_ms);
if (poll_rv < 0) {
if (errno != EINTR) {
diff --git a/src/core/iomgr/pollset_multipoller_with_poll_posix.c b/src/core/iomgr/pollset_multipoller_with_poll_posix.c
index b5b2d7534d..388b2d2a8a 100644
--- a/src/core/iomgr/pollset_multipoller_with_poll_posix.c
+++ b/src/core/iomgr/pollset_multipoller_with_poll_posix.c
@@ -144,7 +144,7 @@ static void multipoll_with_poll_pollset_maybe_work(
POLLOUT, &watchers[i]);
}
- r = poll(pfds, pfd_count, timeout);
+ r = grpc_poll_function(pfds, pfd_count, timeout);
for (i = 1; i < pfd_count; i++) {
grpc_fd_end_poll(&watchers[i], pfds[i].revents & POLLIN,
diff --git a/src/core/iomgr/pollset_posix.c b/src/core/iomgr/pollset_posix.c
index d3a9193af1..6bd1b61f24 100644
--- a/src/core/iomgr/pollset_posix.c
+++ b/src/core/iomgr/pollset_posix.c
@@ -38,7 +38,6 @@
#include "src/core/iomgr/pollset_posix.h"
#include <errno.h>
-#include <poll.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
@@ -57,6 +56,8 @@
GPR_TLS_DECL(g_current_thread_poller);
GPR_TLS_DECL(g_current_thread_worker);
+grpc_poll_function_type grpc_poll_function = poll;
+
static void remove_worker(grpc_pollset *p, grpc_pollset_worker *worker) {
worker->prev->next = worker->next;
worker->next->prev = worker->prev;
@@ -89,6 +90,7 @@ static void push_front_worker(grpc_pollset *p, grpc_pollset_worker *worker) {
}
void grpc_pollset_kick(grpc_pollset *p, grpc_pollset_worker *specific_worker) {
+ /* pollset->mu already held */
if (specific_worker != NULL) {
if (specific_worker == GRPC_POLLSET_KICK_BROADCAST) {
for (specific_worker = p->root_worker.next;
@@ -140,10 +142,10 @@ void grpc_pollset_init(grpc_pollset *pollset) {
void grpc_pollset_add_fd(grpc_pollset *pollset, grpc_fd *fd) {
gpr_mu_lock(&pollset->mu);
pollset->vtable->add_fd(pollset, fd, 1);
- /* the following (enabled only in debug) will reacquire and then release
- our lock - meaning that if the unlocking flag passed to del_fd above is
- not respected, the code will deadlock (in a way that we have a chance of
- debugging) */
+/* the following (enabled only in debug) will reacquire and then release
+ our lock - meaning that if the unlocking flag passed to del_fd above is
+ not respected, the code will deadlock (in a way that we have a chance of
+ debugging) */
#ifndef NDEBUG
gpr_mu_lock(&pollset->mu);
gpr_mu_unlock(&pollset->mu);
@@ -153,10 +155,10 @@ void grpc_pollset_add_fd(grpc_pollset *pollset, grpc_fd *fd) {
void grpc_pollset_del_fd(grpc_pollset *pollset, grpc_fd *fd) {
gpr_mu_lock(&pollset->mu);
pollset->vtable->del_fd(pollset, fd, 1);
- /* the following (enabled only in debug) will reacquire and then release
- our lock - meaning that if the unlocking flag passed to del_fd above is
- not respected, the code will deadlock (in a way that we have a chance of
- debugging) */
+/* the following (enabled only in debug) will reacquire and then release
+ our lock - meaning that if the unlocking flag passed to del_fd above is
+ not respected, the code will deadlock (in a way that we have a chance of
+ debugging) */
#ifndef NDEBUG
gpr_mu_lock(&pollset->mu);
gpr_mu_unlock(&pollset->mu);
@@ -168,14 +170,10 @@ static void finish_shutdown(grpc_pollset *pollset) {
pollset->shutdown_done_cb(pollset->shutdown_done_arg);
}
-int grpc_pollset_work(grpc_pollset *pollset, grpc_pollset_worker *worker,
- gpr_timespec deadline) {
+void grpc_pollset_work(grpc_pollset *pollset, grpc_pollset_worker *worker,
+ gpr_timespec now, gpr_timespec deadline) {
/* pollset->mu already held */
- gpr_timespec now = gpr_now(GPR_CLOCK_MONOTONIC);
int added_worker = 0;
- if (gpr_time_cmp(now, deadline) > 0) {
- return 0;
- }
/* this must happen before we (potentially) drop pollset->mu */
worker->next = worker->prev = NULL;
/* TODO(ctiller): pool these */
@@ -217,7 +215,6 @@ done:
gpr_mu_lock(&pollset->mu);
}
}
- return 1;
}
void grpc_pollset_shutdown(grpc_pollset *pollset,
@@ -456,7 +453,7 @@ static void basic_pollset_maybe_work(grpc_pollset *pollset,
/* poll fd count (argument 2) is shortened by one if we have no events
to poll on - such that it only includes the kicker */
- r = poll(pfd, nfds, timeout);
+ r = grpc_poll_function(pfd, nfds, timeout);
GRPC_TIMER_MARK(GRPC_PTAG_POLL_FINISHED, r);
if (fd) {
diff --git a/src/core/iomgr/pollset_posix.h b/src/core/iomgr/pollset_posix.h
index 1c1b736193..69bd9cca8c 100644
--- a/src/core/iomgr/pollset_posix.h
+++ b/src/core/iomgr/pollset_posix.h
@@ -34,6 +34,8 @@
#ifndef GRPC_INTERNAL_CORE_IOMGR_POLLSET_POSIX_H
#define GRPC_INTERNAL_CORE_IOMGR_POLLSET_POSIX_H
+#include <poll.h>
+
#include <grpc/support/sync.h>
#include "src/core/iomgr/wakeup_fd_posix.h"
@@ -102,7 +104,8 @@ void grpc_kick_drain(grpc_pollset *p);
- longer than a millisecond polls are rounded up to the next nearest
millisecond to avoid spinning
- infinite timeouts are converted to -1 */
-int grpc_poll_deadline_to_millis_timeout(gpr_timespec deadline, gpr_timespec now);
+int grpc_poll_deadline_to_millis_timeout(gpr_timespec deadline,
+ gpr_timespec now);
/* turn a pollset into a multipoller: platform specific */
typedef void (*grpc_platform_become_multipoller_type)(grpc_pollset *pollset,
@@ -117,4 +120,8 @@ void grpc_poll_become_multipoller(grpc_pollset *pollset, struct grpc_fd **fds,
* be locked) */
int grpc_pollset_has_workers(grpc_pollset *pollset);
+/* override to allow tests to hook poll() usage */
+typedef int (*grpc_poll_function_type)(struct pollfd *, nfds_t, int);
+extern grpc_poll_function_type grpc_poll_function;
+
#endif /* GRPC_INTERNAL_CORE_IOMGR_POLLSET_POSIX_H */
diff --git a/src/core/iomgr/pollset_windows.c b/src/core/iomgr/pollset_windows.c
index 22dc5891c3..1078fa5384 100644
--- a/src/core/iomgr/pollset_windows.c
+++ b/src/core/iomgr/pollset_windows.c
@@ -100,13 +100,9 @@ void grpc_pollset_destroy(grpc_pollset *pollset) {
gpr_mu_destroy(&pollset->mu);
}
-int grpc_pollset_work(grpc_pollset *pollset, grpc_pollset_worker *worker, gpr_timespec deadline) {
- gpr_timespec now;
+void grpc_pollset_work(grpc_pollset *pollset, grpc_pollset_worker *worker,
+ gpr_timespec now, gpr_timespec deadline) {
int added_worker = 0;
- now = gpr_now(GPR_CLOCK_MONOTONIC);
- if (gpr_time_cmp(now, deadline) > 0) {
- return 0 /* GPR_FALSE */;
- }
worker->next = worker->prev = NULL;
gpr_cv_init(&worker->cv);
if (grpc_maybe_call_delayed_callbacks(&pollset->mu, 1 /* GPR_TRUE */)) {
@@ -127,7 +123,6 @@ done:
if (added_worker) {
remove_worker(pollset, worker);
}
- return 1 /* GPR_TRUE */;
}
void grpc_pollset_kick(grpc_pollset *p, grpc_pollset_worker *specific_worker) {
diff --git a/src/core/security/google_default_credentials.c b/src/core/security/google_default_credentials.c
index d1f228665f..347b0da643 100644
--- a/src/core/security/google_default_credentials.c
+++ b/src/core/security/google_default_credentials.c
@@ -115,7 +115,7 @@ static int is_stack_running_on_compute_engine(void) {
gpr_mu_lock(GRPC_POLLSET_MU(&detector.pollset));
while (!detector.is_done) {
grpc_pollset_worker worker;
- grpc_pollset_work(&detector.pollset, &worker,
+ grpc_pollset_work(&detector.pollset, &worker, gpr_now(GPR_CLOCK_MONOTONIC),
gpr_inf_future(GPR_CLOCK_MONOTONIC));
}
gpr_mu_unlock(GRPC_POLLSET_MU(&detector.pollset));
diff --git a/src/core/surface/completion_queue.c b/src/core/surface/completion_queue.c
index 378b3f71a1..b58115a93f 100644
--- a/src/core/surface/completion_queue.c
+++ b/src/core/surface/completion_queue.c
@@ -167,10 +167,12 @@ void grpc_cq_end_op(grpc_completion_queue *cc, void *tag, int success,
}
grpc_event grpc_completion_queue_next(grpc_completion_queue *cc,
- gpr_timespec deadline,
- void *reserved) {
+ gpr_timespec deadline, void *reserved) {
grpc_event ret;
grpc_pollset_worker worker;
+ int first_loop = 1;
+ gpr_timespec now;
+
GPR_ASSERT(!reserved);
deadline = gpr_convert_clock_type(deadline, GPR_CLOCK_MONOTONIC);
@@ -197,12 +199,15 @@ grpc_event grpc_completion_queue_next(grpc_completion_queue *cc,
ret.type = GRPC_QUEUE_SHUTDOWN;
break;
}
- if (!grpc_pollset_work(&cc->pollset, &worker, deadline)) {
+ now = gpr_now(GPR_CLOCK_MONOTONIC);
+ if (!first_loop && gpr_time_cmp(now, deadline) >= 0) {
gpr_mu_unlock(GRPC_POLLSET_MU(&cc->pollset));
memset(&ret, 0, sizeof(ret));
ret.type = GRPC_QUEUE_TIMEOUT;
break;
}
+ first_loop = 0;
+ grpc_pollset_work(&cc->pollset, &worker, now, deadline);
}
GRPC_SURFACE_TRACE_RETURNED_EVENT(cc, &ret);
GRPC_CQ_INTERNAL_UNREF(cc, "next");
@@ -240,6 +245,9 @@ grpc_event grpc_completion_queue_pluck(grpc_completion_queue *cc, void *tag,
grpc_cq_completion *c;
grpc_cq_completion *prev;
grpc_pollset_worker worker;
+ gpr_timespec now;
+ int first_loop = 1;
+
GPR_ASSERT(!reserved);
deadline = gpr_convert_clock_type(deadline, GPR_CLOCK_MONOTONIC);
@@ -272,8 +280,9 @@ grpc_event grpc_completion_queue_pluck(grpc_completion_queue *cc, void *tag,
break;
}
if (!add_plucker(cc, tag, &worker)) {
- gpr_log(GPR_DEBUG,
- "Too many outstanding grpc_completion_queue_pluck calls: maximum is %d",
+ gpr_log(GPR_DEBUG,
+ "Too many outstanding grpc_completion_queue_pluck calls: maximum "
+ "is %d",
GRPC_MAX_COMPLETION_QUEUE_PLUCKERS);
gpr_mu_unlock(GRPC_POLLSET_MU(&cc->pollset));
memset(&ret, 0, sizeof(ret));
@@ -281,13 +290,16 @@ grpc_event grpc_completion_queue_pluck(grpc_completion_queue *cc, void *tag,
ret.type = GRPC_QUEUE_TIMEOUT;
break;
}
- if (!grpc_pollset_work(&cc->pollset, &worker, deadline)) {
+ now = gpr_now(GPR_CLOCK_MONOTONIC);
+ if (!first_loop && gpr_time_cmp(now, deadline) >= 0) {
del_plucker(cc, tag, &worker);
gpr_mu_unlock(GRPC_POLLSET_MU(&cc->pollset));
memset(&ret, 0, sizeof(ret));
ret.type = GRPC_QUEUE_TIMEOUT;
break;
}
+ first_loop = 0;
+ grpc_pollset_work(&cc->pollset, &worker, now, deadline);
del_plucker(cc, tag, &worker);
}
done:
diff --git a/src/cpp/server/server.cc b/src/cpp/server/server.cc
index a70b555855..dbe60e50de 100644
--- a/src/cpp/server/server.cc
+++ b/src/cpp/server/server.cc
@@ -50,6 +50,52 @@
namespace grpc {
+class Server::UnimplementedAsyncRequestContext {
+ protected:
+ UnimplementedAsyncRequestContext() : generic_stream_(&server_context_) {}
+
+ GenericServerContext server_context_;
+ GenericServerAsyncReaderWriter generic_stream_;
+};
+
+class Server::UnimplementedAsyncRequest GRPC_FINAL
+ : public UnimplementedAsyncRequestContext,
+ public GenericAsyncRequest {
+ public:
+ UnimplementedAsyncRequest(Server* server, ServerCompletionQueue* cq)
+ : GenericAsyncRequest(server, &server_context_, &generic_stream_, cq, cq,
+ NULL, false),
+ server_(server),
+ cq_(cq) {}
+
+ bool FinalizeResult(void** tag, bool* status) GRPC_OVERRIDE;
+
+ ServerContext* context() { return &server_context_; }
+ GenericServerAsyncReaderWriter* stream() { return &generic_stream_; }
+
+ private:
+ Server* const server_;
+ ServerCompletionQueue* const cq_;
+};
+
+typedef SneakyCallOpSet<CallOpSendInitialMetadata, CallOpServerSendStatus>
+ UnimplementedAsyncResponseOp;
+class Server::UnimplementedAsyncResponse GRPC_FINAL
+ : public UnimplementedAsyncResponseOp {
+ public:
+ UnimplementedAsyncResponse(UnimplementedAsyncRequest* request);
+ ~UnimplementedAsyncResponse() { delete request_; }
+
+ bool FinalizeResult(void** tag, bool* status) GRPC_OVERRIDE {
+ bool r = UnimplementedAsyncResponseOp::FinalizeResult(tag, status);
+ delete this;
+ return r;
+ }
+
+ private:
+ UnimplementedAsyncRequest* const request_;
+};
+
class Server::ShutdownRequest GRPC_FINAL : public CompletionQueueTag {
public:
bool FinalizeResult(void** tag, bool* status) {
@@ -230,11 +276,11 @@ Server::~Server() {
delete sync_methods_;
}
-bool Server::RegisterService(const grpc::string *host, RpcService* service) {
+bool Server::RegisterService(const grpc::string* host, RpcService* service) {
for (int i = 0; i < service->GetMethodCount(); ++i) {
RpcServiceMethod* method = service->GetMethod(i);
- void* tag = grpc_server_register_method(
- server_, method->name(), host ? host->c_str() : nullptr);
+ void* tag = grpc_server_register_method(server_, method->name(),
+ host ? host->c_str() : nullptr);
if (!tag) {
gpr_log(GPR_DEBUG, "Attempt to register %s multiple times",
method->name());
@@ -277,27 +323,15 @@ int Server::AddListeningPort(const grpc::string& addr,
return creds->AddPortToServer(addr, server_);
}
-bool Server::Start() {
+bool Server::Start(ServerCompletionQueue** cqs, size_t num_cqs) {
GPR_ASSERT(!started_);
started_ = true;
grpc_server_start(server_);
if (!has_generic_service_) {
- unknown_method_.reset(new RpcServiceMethod(
- "unknown", RpcMethod::BIDI_STREAMING, new UnknownMethodHandler));
- // Use of emplace_back with just constructor arguments is not accepted here
- // by gcc-4.4 because it can't match the anonymous nullptr with a proper
- // constructor implicitly. Construct the object and use push_back.
- sync_methods_->push_back(SyncRequest(unknown_method_.get(), nullptr));
- }
- // Start processing rpcs.
- if (!sync_methods_->empty()) {
- for (auto m = sync_methods_->begin(); m != sync_methods_->end(); m++) {
- m->SetupRequest();
- m->Request(server_, cq_.cq());
+ for (size_t i = 0; i < num_cqs; i++) {
+ new UnimplementedAsyncRequest(this, cqs[i]);
}
-
- ScheduleCallback();
}
return true;
@@ -335,12 +369,14 @@ void Server::PerformOpsOnCall(CallOpSetInterface* ops, Call* call) {
Server::BaseAsyncRequest::BaseAsyncRequest(
Server* server, ServerContext* context,
- ServerAsyncStreamingInterface* stream, CompletionQueue* call_cq, void* tag)
+ ServerAsyncStreamingInterface* stream, CompletionQueue* call_cq, void* tag,
+ bool delete_on_finalize)
: server_(server),
context_(context),
stream_(stream),
call_cq_(call_cq),
tag_(tag),
+ delete_on_finalize_(delete_on_finalize),
call_(nullptr) {
memset(&initial_metadata_array_, 0, sizeof(initial_metadata_array_));
}
@@ -367,14 +403,16 @@ bool Server::BaseAsyncRequest::FinalizeResult(void** tag, bool* status) {
// just the pointers inside call are copied here
stream_->BindCall(&call);
*tag = tag_;
- delete this;
+ if (delete_on_finalize_) {
+ delete this;
+ }
return true;
}
Server::RegisteredAsyncRequest::RegisteredAsyncRequest(
Server* server, ServerContext* context,
ServerAsyncStreamingInterface* stream, CompletionQueue* call_cq, void* tag)
- : BaseAsyncRequest(server, context, stream, call_cq, tag) {}
+ : BaseAsyncRequest(server, context, stream, call_cq, tag, true) {}
void Server::RegisteredAsyncRequest::IssueRequest(
void* registered_method, grpc_byte_buffer** payload,
@@ -388,8 +426,9 @@ void Server::RegisteredAsyncRequest::IssueRequest(
Server::GenericAsyncRequest::GenericAsyncRequest(
Server* server, GenericServerContext* context,
ServerAsyncStreamingInterface* stream, CompletionQueue* call_cq,
- ServerCompletionQueue* notification_cq, void* tag)
- : BaseAsyncRequest(server, context, stream, call_cq, tag) {
+ ServerCompletionQueue* notification_cq, void* tag, bool delete_on_finalize)
+ : BaseAsyncRequest(server, context, stream, call_cq, tag,
+ delete_on_finalize) {
grpc_call_details_init(&call_details_);
GPR_ASSERT(notification_cq);
GPR_ASSERT(call_cq);
@@ -410,6 +449,25 @@ bool Server::GenericAsyncRequest::FinalizeResult(void** tag, bool* status) {
return BaseAsyncRequest::FinalizeResult(tag, status);
}
+bool Server::UnimplementedAsyncRequest::FinalizeResult(void** tag,
+ bool* status) {
+ if (GenericAsyncRequest::FinalizeResult(tag, status) && *status) {
+ new UnimplementedAsyncRequest(server_, cq_);
+ new UnimplementedAsyncResponse(this);
+ } else {
+ delete this;
+ }
+ return false;
+}
+
+Server::UnimplementedAsyncResponse::UnimplementedAsyncResponse(
+ UnimplementedAsyncRequest* request)
+ : request_(request) {
+ Status status(StatusCode::UNIMPLEMENTED, "");
+ UnknownMethodHandler::FillOps(request_->context(), this);
+ request_->stream()->call_.PerformOps(this);
+}
+
void Server::ScheduleCallback() {
{
grpc::unique_lock<grpc::mutex> lock(mu_);
diff --git a/src/cpp/server/server_builder.cc b/src/cpp/server/server_builder.cc
index 09118879f4..a13269abbf 100644
--- a/src/cpp/server/server_builder.cc
+++ b/src/cpp/server/server_builder.cc
@@ -59,14 +59,16 @@ void ServerBuilder::RegisterAsyncService(AsynchronousService* service) {
async_services_.emplace_back(new NamedService<AsynchronousService>(service));
}
-void ServerBuilder::RegisterService(
- const grpc::string& addr, SynchronousService* service) {
- services_.emplace_back(new NamedService<RpcService>(addr, service->service()));
+void ServerBuilder::RegisterService(const grpc::string& addr,
+ SynchronousService* service) {
+ services_.emplace_back(
+ new NamedService<RpcService>(addr, service->service()));
}
-void ServerBuilder::RegisterAsyncService(
- const grpc::string& addr, AsynchronousService* service) {
- async_services_.emplace_back(new NamedService<AsynchronousService>(addr, service));
+void ServerBuilder::RegisterAsyncService(const grpc::string& addr,
+ AsynchronousService* service) {
+ async_services_.emplace_back(
+ new NamedService<AsynchronousService>(addr, service));
}
void ServerBuilder::RegisterAsyncGenericService(AsyncGenericService* service) {
@@ -101,12 +103,6 @@ std::unique_ptr<Server> ServerBuilder::BuildAndStart() {
thread_pool_ = CreateDefaultThreadPool();
thread_pool_owned = true;
}
- // Async services only, create a thread pool to handle requests to unknown
- // services.
- if (!thread_pool_ && !generic_service_ && !async_services_.empty()) {
- thread_pool_ = new FixedSizeThreadPool(1);
- thread_pool_owned = true;
- }
std::unique_ptr<Server> server(
new Server(thread_pool_, thread_pool_owned, max_message_size_));
for (auto cq = cqs_.begin(); cq != cqs_.end(); ++cq) {
@@ -119,9 +115,10 @@ std::unique_ptr<Server> ServerBuilder::BuildAndStart() {
return nullptr;
}
}
- for (auto service = async_services_.begin();
- service != async_services_.end(); service++) {
- if (!server->RegisterAsyncService((*service)->host.get(), (*service)->service)) {
+ for (auto service = async_services_.begin(); service != async_services_.end();
+ service++) {
+ if (!server->RegisterAsyncService((*service)->host.get(),
+ (*service)->service)) {
return nullptr;
}
}
@@ -135,7 +132,7 @@ std::unique_ptr<Server> ServerBuilder::BuildAndStart() {
*port->selected_port = r;
}
}
- if (!server->Start()) {
+ if (!server->Start(&cqs_[0], cqs_.size())) {
return nullptr;
}
return server;