1 /*

     2  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  *

    23  */

    24 

    25 #ifndef SHARE_VM_UTILITIES_DEFAULTSTREAM_HPP

    26 #define SHARE_VM_UTILITIES_DEFAULTSTREAM_HPP

    27 

    28 #include "utilities/xmlstream.hpp"

    29 

    30 class defaultStream : public xmlTextStream {

    31   friend void ostream_abort();

    32  public:

    33   enum { NO_WRITER = -1 };

    34  private:

    35   bool         _inited;

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

    37   static int   _output_fd;

    38   static int   _error_fd;

    39   static FILE* _output_stream;

    40   static FILE* _error_stream;

    41 

    42   void init();

    43   void init_log();

    44   fileStream* open_file(const char* log_name);

    45   void start_log();

    46   void finish_log();

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

    48  public:

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

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

    51   defaultStream() {

    52     _log_file = NULL;

    53     _inited = false;

    54     _writer = -1;

    55     _last_writer = -1;

    56   }

    57 

    58   ~defaultStream() {

    59     if (has_log_file())  finish_log();

    60   }

    61 

    62   static inline FILE* output_stream() {

    63     return DisplayVMOutputToStderr ? _error_stream : _output_stream;

    64   }

    65   static inline FILE* error_stream() {

    66     return DisplayVMOutputToStdout ? _output_stream : _error_stream;

    67   }

    68   static inline int output_fd() {

    69     return DisplayVMOutputToStderr ? _error_fd : _output_fd;

    70   }

    71   static inline int error_fd() {

    72     return DisplayVMOutputToStdout ? _output_fd : _error_fd;

    73   }

    74 

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

    76 

    77   void flush() {

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

    79     // should add the following assert here:

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

    81     xmlTextStream::flush();

    82     fflush(output_stream());

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

    84   }

    85 

    86   // advisory lock/unlock of _writer field:

    87  private:

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

    89   intx _last_writer;

    90  public:

    91   intx hold(intx writer_id);

    92   void release(intx holder);

    93   intx writer() { return _writer; }

    94   bool has_log_file();

    95 

    96   static defaultStream* instance;  // sole instance

    97 };

    98 

    99 #endif // SHARE_VM_UTILITIES_DEFAULTSTREAM_HPP