jdk8-mips64-public/hotspot: src/share/vm/utilities/defaultStream.hpp@a61af66fc99e

     1 /*

     2  * Copyright 2003-2004 Sun Microsystems, Inc.  All Rights Reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    20  * CA 95054 USA or visit www.sun.com if you need additional information or

    21  * have any questions.

    22  *

    23  */

    25 class defaultStream : public xmlTextStream {

    26   friend void ostream_abort();

    27  public:

    28   enum { NO_WRITER = -1 };

    29  private:

    30   bool         _inited;

    31   fileStream*  _log_file;  // XML-formatted file shared by all threads

    32   static int   _output_fd;

    33   static int   _error_fd;

    34   static FILE* _output_stream;

    35   static FILE* _error_stream;

    37   void init();

    38   void init_log();

    39   void finish_log();

    40   void finish_log_on_error(char *buf, int buflen);

    41  public:

    42   // must defer time stamp due to the fact that os::init() hasn't

    43   // yet been called and os::elapsed_counter() may not be valid

    44   defaultStream() {

    45     _log_file = NULL;

    46     _inited = false;

    47     _writer = -1;

    48     _last_writer = -1;

    49   }

    51   ~defaultStream() {

    52     if (has_log_file())  finish_log();

    53   }

    55   static inline FILE* output_stream() {

    56     return DisplayVMOutputToStderr ? _error_stream : _output_stream;

    57   }

    58   static inline FILE* error_stream() {

    59     return DisplayVMOutputToStdout ? _output_stream : _error_stream;

    60   }

    61   static inline int output_fd() {

    62     return DisplayVMOutputToStderr ? _error_fd : _output_fd;

    63   }

    64   static inline int error_fd() {

    65     return DisplayVMOutputToStdout ? _output_fd : _error_fd;

    66   }

    68   virtual void write(const char* s, size_t len);

    70   void flush() {

    71     // once we can determine whether we are in a signal handler, we

    72     // should add the following assert here:

    73     // assert(xxxxxx, "can not flush buffer inside signal handler");

    74     xmlTextStream::flush();

    75     fflush(output_stream());

    76     if (has_log_file()) _log_file->flush();

    77   }

    79   // advisory lock/unlock of _writer field:

    80  private:

    81   intx _writer;    // thread_id with current rights to output

    82   intx _last_writer;

    83  public:

    84   intx hold(intx writer_id);

    85   void release(intx holder);

    86   intx writer() { return _writer; }

    87   bool has_log_file();

    89   static defaultStream* instance;  // sole instance

    90 };

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