src/hotspot/os/bsd/osThread_bsd.cpp

/*
 * Copyright (c) 1999, 2025, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 *
 */

#include "memory/allocation.hpp"
#include "runtime/mutex.hpp"
#include "runtime/osThread.hpp"

#include <signal.h>

OSThread::OSThread()
  : _thread_id(
#ifdef __APPLE__
        0
#else
        nullptr
#endif
    ),
    _pthread_id(nullptr),
    _unique_thread_id(0),
    _caller_sigmask(),
    sr(),
    _siginfo(nullptr),
    _ucontext(nullptr),
    _expanding_stack(0),
    _alt_sig_stack(nullptr),
    _startThread_lock(new Monitor(Mutex::event, "startThread_lock")) {
  sigemptyset(&_caller_sigmask);
}

// Additional thread_id used to correlate threads in SA
void OSThread::set_unique_thread_id() {
#ifdef __APPLE__
  thread_identifier_info_data_t m_ident_info;
  mach_msg_type_number_t count = THREAD_IDENTIFIER_INFO_COUNT;

  mach_port_t mach_thread_port = mach_thread_self();
  guarantee(mach_thread_port != 0, "just checking");
  thread_info(mach_thread_port, THREAD_IDENTIFIER_INFO,
              (thread_info_t) &m_ident_info, &count);
  mach_port_deallocate(mach_task_self(), mach_thread_port);

  _unique_thread_id = m_ident_info.thread_id;
#endif
}

OSThread::~OSThread() {
  delete _startThread_lock;
}