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Java example source code file (threadLS_bsd_x86.hpp)

This example Java source code file (threadLS_bsd_x86.hpp) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

amd64, os_cpu_bsd_x86_vm_threadls_bsd_x86_hpp, page_shift, page_size, sp_bitlength, thread

The threadLS_bsd_x86.hpp Java example source code

/*
 * Copyright (c) 1999, 2010, 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
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 *
 */

#ifndef OS_CPU_BSD_X86_VM_THREADLS_BSD_X86_HPP
#define OS_CPU_BSD_X86_VM_THREADLS_BSD_X86_HPP

  // Processor dependent parts of ThreadLocalStorage

#ifndef AMD64
  // map stack pointer to thread pointer - see notes in threadLS_bsd_x86.cpp
  #define SP_BITLENGTH  32
#ifndef PAGE_SHIFT
  #define PAGE_SHIFT    12
  #define PAGE_SIZE     (1UL << PAGE_SHIFT)
#endif
  static Thread* _sp_map[1UL << (SP_BITLENGTH - PAGE_SHIFT)];
#endif // !AMD64

public:

#ifndef AMD64
  static Thread** sp_map_addr() { return _sp_map; }
#endif // !AMD64

  static Thread* thread() {
#ifdef AMD64
    return (Thread*) os::thread_local_storage_at(thread_index());
#else
    uintptr_t sp;
    __asm__ volatile ("movl %%esp, %0" : "=r" (sp));
    return _sp_map[sp >> PAGE_SHIFT];
#endif // AMD64
  }

#endif // OS_CPU_BSD_X86_VM_THREADLS_BSD_X86_HPP

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