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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 "src/core/lib/gprpp/thd.h"
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
#include <grpc/support/thd_id.h>
#include <string.h>
#if defined(_MSC_VER)
#define thread_local __declspec(thread)
#define WIN_LAMBDA
#elif defined(__GNUC__)
#define thread_local __thread
#define WIN_LAMBDA WINAPI
#else
#error "Unknown compiler - please file a bug report"
#endif
namespace {
struct thd_info {
grpc_core::Thread* thread;
void (*body)(void* arg); /* body of a thread */
void* arg; /* argument to a thread */
HANDLE join_event; /* the join event */
};
thread_local struct thd_info* g_thd_info;
/* Destroys a thread info */
void destroy_thread(struct thd_info* t) {
CloseHandle(t->join_event);
gpr_free(t);
}
} // namespace
namespace grpc_core {
void Thread::Init() {}
bool Thread::AwaitAll(gpr_timespec deadline) {
// TODO: Consider adding this if needed
return false;
}
Thread::Thread(const char* thd_name, void (*thd_body)(void* arg), void* arg,
bool* success)
: real_(true), alive_(false), started_(false), joined_(false) {
gpr_mu_init(&mu_);
gpr_cv_init(&ready_);
HANDLE handle;
struct thd_info* info = (struct thd_info*)gpr_malloc(sizeof(*info));
info->thread = this;
info->body = thd_body;
info->arg = arg;
info->join_event = CreateEvent(nullptr, FALSE, FALSE, nullptr);
if (info->join_event == nullptr) {
gpr_free(info);
alive_ = false;
} else {
handle = CreateThread(nullptr, 64 * 1024,
[](void* v) WIN_LAMBDA -> DWORD {
g_thd_info = static_cast<thd_info*>(v);
gpr_mu_lock(&g_thd_info->thread->mu_);
if (!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_);
g_thd_info->body(g_thd_info->arg);
BOOL ret = SetEvent(g_thd_info->join_event);
GPR_ASSERT(ret);
return 0;
},
info, 0, nullptr);
if (handle == nullptr) {
destroy_thread(info);
alive_ = false;
} else {
id_ = (gpr_thd_id)info;
CloseHandle(handle);
alive_ = true;
}
}
if (success != nullptr) {
*success = alive_;
}
}
Thread::~Thread() {
if (!alive_) {
// This thread never existed, so nothing to do
} else {
GPR_ASSERT(joined_);
}
if (real_) {
gpr_mu_destroy(&mu_);
gpr_cv_destroy(&ready_);
}
}
void Thread::Start() {
gpr_mu_lock(&mu_);
if (alive_) {
started_ = true;
gpr_cv_signal(&ready_);
}
gpr_mu_unlock(&mu_);
}
void Thread::Join() {
if (alive_) {
thd_info* info = (thd_info*)id_;
DWORD ret = WaitForSingleObject(info->join_event, INFINITE);
GPR_ASSERT(ret == WAIT_OBJECT_0);
destroy_thread(info);
}
joined_ = true;
}
} // namespace grpc_core
gpr_thd_id gpr_thd_currentid(void) { return (gpr_thd_id)g_thd_info; }
#endif /* GPR_WINDOWS */
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