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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 <grpc/support/alloc.h>
#include <grpc/support/log.h>
#include <grpc/support/thd.h>
#include <string.h>
#if defined(_MSC_VER)
#define thread_local __declspec(thread)
#elif defined(__GNUC__)
#define thread_local __thread
#else
#error "Unknown compiler - please file a bug report"
#endif
struct thd_info {
void (*body)(void *arg); /* body of a thread */
void *arg; /* argument to a thread */
HANDLE join_event; /* if joinable, the join event */
int joinable; /* true if not detached */
};
static thread_local struct thd_info *g_thd_info;
/* Destroys a thread info */
static void destroy_thread(struct thd_info *t) {
if (t->joinable) CloseHandle(t->join_event);
gpr_free(t);
}
/* Body of every thread started via gpr_thd_new. */
static DWORD WINAPI thread_body(void *v) {
g_thd_info = (struct thd_info *)v;
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 {
destroy_thread(g_thd_info);
}
return 0;
}
int gpr_thd_new(gpr_thd_id *t, void (*thd_body)(void *arg), void *arg,
const gpr_thd_options *options) {
HANDLE handle;
struct thd_info *info = gpr_malloc(sizeof(*info));
info->body = thd_body;
info->arg = arg;
*t = 0;
if (gpr_thd_options_is_joinable(options)) {
info->joinable = 1;
info->join_event = CreateEvent(NULL, FALSE, FALSE, NULL);
if (info->join_event == NULL) {
gpr_free(info);
return 0;
}
} else {
info->joinable = 0;
}
handle = CreateThread(NULL, 64 * 1024, thread_body, info, 0, NULL);
if (handle == NULL) {
destroy_thread(info);
} else {
*t = (gpr_thd_id)info;
CloseHandle(handle);
}
return handle != NULL;
}
gpr_thd_id gpr_thd_currentid(void) { return (gpr_thd_id)g_thd_info; }
void gpr_thd_join(gpr_thd_id t) {
struct thd_info *info = (struct thd_info *)t;
DWORD ret = WaitForSingleObject(info->join_event, INFINITE);
GPR_ASSERT(ret == WAIT_OBJECT_0);
destroy_thread(info);
}
#endif /* GPR_WINDOWS */
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