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//
//
// Copyright 2015 gRPC authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
//
// Windows implementation for gpr threads.
#include <grpc/support/port_platform.h>
#ifdef GPR_WINDOWS
#include <string.h>
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
#include <grpc/support/sync.h>
#include <grpc/support/thd_id.h>
#include <grpc/support/time.h>
#include "src/core/lib/gprpp/crash.h"
#include "src/core/lib/gprpp/memory.h"
#include "src/core/lib/gprpp/thd.h"
namespace {
class ThreadInternalsWindows;
struct thd_info {
ThreadInternalsWindows* thread;
void (*body)(void* arg); // body of a thread
void* arg; // argument to a thread
HANDLE join_event; // the join event
bool joinable; // whether it is joinable
};
thread_local struct thd_info* g_thd_info;
class ThreadInternalsWindows
: public grpc_core::internal::ThreadInternalsInterface {
public:
ThreadInternalsWindows(void (*thd_body)(void* arg), void* arg, bool* success,
const grpc_core::Thread::Options& options)
: started_(false) {
gpr_mu_init(&mu_);
gpr_cv_init(&ready_);
HANDLE handle;
info_ = (struct thd_info*)gpr_malloc(sizeof(*info_));
info_->thread = this;
info_->body = thd_body;
info_->arg = arg;
info_->join_event = nullptr;
info_->joinable = options.joinable();
if (info_->joinable) {
info_->join_event = CreateEvent(nullptr, FALSE, FALSE, nullptr);
if (info_->join_event == nullptr) {
gpr_free(info_);
*success = false;
return;
}
}
if (options.stack_size() != 0) {
// Windows will round up the given stack_size value to nearest page.
handle = CreateThread(nullptr, options.stack_size(), thread_body, info_,
0, nullptr);
} else {
handle = CreateThread(nullptr, 64 * 1024, thread_body, info_, 0, nullptr);
}
if (handle == nullptr) {
destroy_thread();
*success = false;
} else {
CloseHandle(handle);
*success = true;
}
}
~ThreadInternalsWindows() override {
gpr_mu_destroy(&mu_);
gpr_cv_destroy(&ready_);
}
void Start() override {
gpr_mu_lock(&mu_);
started_ = true;
gpr_cv_signal(&ready_);
gpr_mu_unlock(&mu_);
}
void Join() override {
DWORD ret = WaitForSingleObject(info_->join_event, INFINITE);
GPR_ASSERT(ret == WAIT_OBJECT_0);
destroy_thread();
}
private:
static DWORD WINAPI thread_body(void* v) {
g_thd_info = static_cast<thd_info*>(v);
gpr_mu_lock(&g_thd_info->thread->mu_);
while (!g_thd_info->thread->started_) {
gpr_cv_wait(&g_thd_info->thread->ready_, &g_thd_info->thread->mu_,
gpr_inf_future(GPR_CLOCK_MONOTONIC));
}
gpr_mu_unlock(&g_thd_info->thread->mu_);
if (!g_thd_info->joinable) {
delete g_thd_info->thread;
g_thd_info->thread = nullptr;
}
g_thd_info->body(g_thd_info->arg);
if (g_thd_info->joinable) {
BOOL ret = SetEvent(g_thd_info->join_event);
GPR_ASSERT(ret);
} else {
gpr_free(g_thd_info);
}
return 0;
}
void destroy_thread() {
if (info_ != nullptr && info_->joinable) {
CloseHandle(info_->join_event);
}
gpr_free(info_);
}
gpr_mu mu_;
gpr_cv ready_;
bool started_;
thd_info* info_;
};
} // namespace
namespace grpc_core {
Thread::Thread(const char* /* thd_name */, void (*thd_body)(void* arg),
void* arg, bool* success, const Options& options)
: options_(options) {
bool outcome = false;
impl_ = new ThreadInternalsWindows(thd_body, arg, &outcome, options);
if (outcome) {
state_ = ALIVE;
} else {
state_ = FAILED;
delete impl_;
impl_ = nullptr;
}
if (success != nullptr) {
*success = outcome;
}
}
} // namespace grpc_core
gpr_thd_id gpr_thd_currentid(void) {
return reinterpret_cast<gpr_thd_id>(g_thd_info);
}
#endif // GPR_WINDOWS
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