<commit_before>/*
 *
 * 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.
 *
 */

/* Posix implementation for gpr threads. */

#include <grpc/support/port_platform.h>

#ifdef GPR_POSIX_SYNC

#include "src/core/lib/gprpp/thd.h"

#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
#include <grpc/support/sync.h>
#include <grpc/support/thd_id.h>
#include <pthread.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "src/core/lib/gpr/useful.h"
#include "src/core/lib/gprpp/fork.h"
#include "src/core/lib/gprpp/memory.h"

namespace grpc_core {
namespace {
class ThreadInternalsPosix;
struct thd_arg {
  ThreadInternalsPosix* thread;
  void (*body)(void* arg); /* body of a thread */
  void* arg;               /* argument to a thread */
  const char* name;        /* name of thread. Can be nullptr. */
  bool joinable;
  bool tracked;
};

const size_t page_size = static_cast<size_t>(sysconf(_SC_PAGESIZE));

size_t RoundUpToPageSize(size_t size) {
  return (size + page_size - 1) & ~(page_size - 1);
}

// Returns the minimum valid stack size that can be passed to
// pthread_attr_setstacksize.
size_t MinValidStackSize(size_t request_size) {
  if (request_size < _SC_THREAD_STACK_MIN) {
    request_size = _SC_THREAD_STACK_MIN;<commit_msg>Add TODO comment<commit_after>/*
 *
 * 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.
 *
 */

/* Posix implementation for gpr threads. */

#include <grpc/support/port_platform.h>

#ifdef GPR_POSIX_SYNC

#include "src/core/lib/gprpp/thd.h"

#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
#include <grpc/support/sync.h>
#include <grpc/support/thd_id.h>
#include <pthread.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "src/core/lib/gpr/useful.h"
#include "src/core/lib/gprpp/fork.h"
#include "src/core/lib/gprpp/memory.h"

namespace grpc_core {
namespace {
class ThreadInternalsPosix;
struct thd_arg {
  ThreadInternalsPosix* thread;
  void (*body)(void* arg); /* body of a thread */
  void* arg;               /* argument to a thread */
  const char* name;        /* name of thread. Can be nullptr. */
  bool joinable;
  bool tracked;
};

// TODO(yunjiaw): move this to a function-level static, or remove the use of a
// non-constexpr initializer when possible
const size_t page_size = static_cast<size_t>(sysconf(_SC_PAGESIZE));

size_t RoundUpToPageSize(size_t size) {
  return (size + page_size - 1) & ~(page_size - 1);
}

// Returns the minimum valid stack size that can be passed to
// pthread_attr_setstacksize.
size_t MinValidStackSize(size_t request_size) {
  if (request_size < _SC_THREAD_STACK_MIN) {
    request_size = _SC_THREAD_STACK_MIN;
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