420 строки
14 KiB
C
420 строки
14 KiB
C
/*
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* Copyright (c) 2004-2005 The Trustees of Indiana University.
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* All rights reserved.
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* Copyright (c) 2004-2005 The Trustees of the University of Tennessee.
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* All rights reserved.
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* Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
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* University of Stuttgart. All rights reserved.
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* Copyright (c) 2004-2005 The Regents of the University of California.
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* All rights reserved.
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* $COPYRIGHT$
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*
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* Additional copyrights may follow
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*
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* $HEADER$
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*/
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/** @file
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* OPAL output stream facility.
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*
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* The OPAL output stream facility is used to send output from the OPAL
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* libraries to output devices. It is meant to fully replace all
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* forms of printf() (and friends). Output streams are opened via the
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* opal_output_open() function call, and then sent output via
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* opal_output_verbose(), OPAL_OUTPUT(), and opal_output(). Streams are
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* closed with opal_output_close().
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*
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* Streams can multiplex output to several kinds of outputs (one of
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* each):
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*
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* - the syslog
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* - standard output
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* - standard error
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* - file
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*
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* Which outputs to use are specified during opal_output_open().
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*
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* WARNING: When using "file" as an output destination, be aware that
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* the file may not exist until the session directory for the process
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* exists. This is at least part of the way through MPI_INIT (for
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* example). Most MCA components and internals of Open MPI won't be
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* affected by this, but some RTE / startup aspects of Open MPI will
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* not be able to write to a file for output. See opal_output() for
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* details on what happens in these cases.
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*
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* opal_output_open() returns an integer handle that is used in
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* successive calls to OPAL_OUTPUT() and opal_output() to send output to
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* the stream.
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*
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* The default "verbose" stream is opened after invoking
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* opal_output_init() (and closed after invoking
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* opal_output_finalize()). This stream outputs to stderr only, and
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* has a stream handle ID of 0.
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*
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* It is erroneous to have one thread close a stream and have another
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* try to write to it. Multiple threads writing to a single stream
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* will be serialized in an unspecified order.
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*/
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#ifndef OPAL_OUTPUT_H_
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#define OPAL_OUTPUT_H_
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#include "ompi_config.h"
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#include <stdarg.h>
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#if defined(c_plusplus) || defined(__cplusplus)
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extern "C" {
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#endif
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/**
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* \class opal_output_stream_t
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*
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* Structure used to request the opening of a OPAL output stream. A
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* pointer to this structure is passed to opal_output_open() to tell
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* the opal_output subsystem where to send output for a given stream.
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* It is valid to specify multiple destinations of output for a stream
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* -- output streams can be multiplexed to multiple different
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* destinations through the opal_output facility.
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*
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* Note that all strings in this struct are cached on the stream by
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* value; there is no need to keep them allocated after the return
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* from opal_output_open().
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*
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* @see output.h
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*/
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struct opal_output_stream_t {
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/**
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* Indicates whether the output of the stream is
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* debugging/developer-only output or not.
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*
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* This field should be "true" if the output is for debugging
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* purposes only. In that case, the output will never be sent to
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* the stream unless OPAL was configured with --enable-debug.
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*/
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bool lds_is_debugging;
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/**
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* Indicate the starting verbosity level of the stream.
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*
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* Verbose levels are a convenience mechanisms, and are only
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* consulted when output is sent to a stream through the
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* opal_output_verbose() function. Verbose levels are ignored in
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* OPAL_OUTPUT() and opal_output().
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*
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* Valid verbose levels typically start at 0 (meaning "minimal
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* information"). Higher verbosity levels generally indicate that
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* more output and diagnostics should be displayed.
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*/
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int lds_verbose_level;
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/**
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* Indicates whether output of the stream should be sent to the
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* syslog or not.
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*
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* If this field is true, output from this stream is sent to the
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* syslog, and the following fields are also examined:
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*
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* - lds_syslog_priority
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* - lds_syslog_ident
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* - lds_prefix
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*
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* If this field is false, the above three fields are ignored.
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*/
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bool lds_want_syslog;
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/**
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* When opal_output_stream_t::lds_want_syslog is true, this field is
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* examined to see what priority output from the stream should be
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* sent to the syslog.
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*
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* This value should be set as per the syslog(3) man page. It is
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* typically the OR value of "facilty" and "level" values described
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* in the man page.
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*/
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int lds_syslog_priority;
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/**
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* When opal_output_stream_t::lds_want_syslog is true, this field is
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* examined to see what ident value should be passed to openlog(3).
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*
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* If a NULL value is given, the string "opal" is used.
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*/
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char *lds_syslog_ident;
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/**
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* String prefix added to all output on the stream.
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*
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* When this field is non-NULL, it is prefixed to all lines of
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* output on the stream. When this field is NULL, no prefix is
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* added to each line of output in the stream.
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*/
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char *lds_prefix;
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/**
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* Whether to send stream output to stdout or not.
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*
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* If this field is true, stream output is sent to stdout.
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*/
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bool lds_want_stdout;
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/**
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* Whether to send stream output to stderr or not.
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*
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* If this field is true, stream output is sent to stderr.
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*/
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bool lds_want_stderr;
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/**
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* Whether to send stream output to a file or not.
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*
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* When this field is true, stream output is sent to a file, and the
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* following fields are also examined:
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*
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* - lds_want_file_append
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* - lda_file_suffix
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*/
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bool lds_want_file;
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/**
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* When opal_output_stream_t::lds_want_file is true, this field
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* indicates whether to append the file (if it exists) or overwrite
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* it.
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*
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* If false, the file is opened with the O_TRUNC flag.
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*/
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bool lds_want_file_append;
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/**
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* When opal_output_stream_t::lds_want_file is true, this field
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* indicates the string suffix to add to the filename.
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*
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* The output file will be in the OPAL session directory and have a
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* OPAL-generated prefix (generally "$proc_sessiondir/output-").
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* The suffix is intended to give stream users a chance to write
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* their output into unique files. If this field is NULL, the
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* suffix "output.txt" is used.
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*
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* Note that it is possible that the process session directory does
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* not exist when opal_output_open() is invoked. See opal_output()
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* for details on what happens in this situation.
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*/
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char *lds_file_suffix;
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};
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typedef struct opal_output_stream_t opal_output_stream_t;
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/**
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* Initializes the output stream system and opens a default
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* "verbose" stream.
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*
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* @retval true Upon success.
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* @retval false Upon failure.
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*
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* This should be the first function invoked in the output
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* subsystem. After this call, the default "verbose" stream is open
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* and can be written to via calls to opal_output_verbose() and
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* opal_output_error().
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*
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* By definition, the default verbose stream has a handle ID of 0,
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* and has a verbose level of 0.
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*/
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OMPI_DECLSPEC bool opal_output_init(void);
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/**
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* Shut down the output stream system.
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*
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* Shut down the output stream system, including the default verbose
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* stream.
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*/
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OMPI_DECLSPEC void opal_output_finalize(void);
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/**
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* Opens an output stream.
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*
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* @param lds A pointer to opal_output_stream_t describing what the
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* characteristics of the output stream should be.
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*
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* This function opens an output stream and returns an integer
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* handle. The caller is responsible for maintaining the handle and
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* using it in successive calls to OPAL_OUTPUT(), opal_output(),
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* opal_output_switch(), and opal_output_close().
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*
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* If lds is NULL, the default descriptions will be used, meaning
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* that output will only be sent to stderr.
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*
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* It is safe to have multiple threads invoke this function
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* simultaneously; their execution will be serialized in an
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* unspecified manner.
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*
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* Be sure to see opal_output() for a description of what happens
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* when open_open() / opal_output() is directed to send output to a
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* file but the process session directory does not yet exist.
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*/
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OMPI_DECLSPEC int opal_output_open(opal_output_stream_t *lds);
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/**
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* Re-opens / redirects an output stream.
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*
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* @param output_id Stream handle to reopen
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* @param lds A pointer to opal_output_stream_t describing what the
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* characteristics of the reopened output stream should be.
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*
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* This function redirects an existing stream into a new [set of]
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* location[s], as specified by the lds parameter. If the output_is
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* passed is invalid, this call is effectively the same as opening a
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* new stream with a specific stream handle.
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*/
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OMPI_DECLSPEC int opal_output_reopen(int output_id, opal_output_stream_t *lds);
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/**
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* Enables and disables output streams.
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*
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* @param output_id Stream handle to switch
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* @param enable Boolean indicating whether to enable the stream
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* output or not.
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*
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* @returns The previous enable state of the stream (true == enabled,
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* false == disabled).
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*
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* The output of a stream can be temporarily disabled by passing an
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* enable value to false, and later resumed by passing an enable
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* value of true. This does not close the stream -- it simply tells
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* the opal_output subsystem to intercept and discard any output sent
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* to the stream via OPAL_OUTPUT() or opal_output() until the output
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* is re-enabled.
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*/
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OMPI_DECLSPEC bool opal_output_switch(int output_id, bool enable);
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/**
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* \internal
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*
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* Reopens all existing output streams.
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*
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* This function should never be called by user applications; it is
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* typically only invoked after a restart (i.e., in a new process)
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* where output streams need to be re-initialized.
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*/
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OMPI_DECLSPEC void opal_output_reopen_all(void);
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/**
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* Close an output stream.
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*
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* @param output_id Handle of the stream to close.
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*
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* Close an output stream. No output will be sent to the stream
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* after it is closed. Be aware that output handles tend to be
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* re-used; it is possible that after a stream is closed, if another
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* stream is opened, it will get the same handle value.
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*/
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OMPI_DECLSPEC void opal_output_close(int output_id);
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/**
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* Main function to send output to a stream.
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*
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* @param output_id Stream id returned from opal_output_open().
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* @param format printf-style format string.
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* @param varargs printf-style varargs list to fill the string
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* specified by the format parameter.
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*
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* This is the main function to send output to custom streams (note
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* that output to the default "verbose" stream is handled through
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* opal_output_verbose() and opal_output_error()).
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*
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* It is never necessary to send a trailing "\n" in the strings to
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* this function; some streams requires newlines, others do not --
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* this function will append newlines as necessary.
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*
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* Verbosity levels are ignored in this function.
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*
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* Note that for output streams that are directed to files, the
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* files are stored under the process' session directory. If the
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* session directory does not exist when opal_output() is invoked,
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* the output will be discarded! Once the session directory is
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* created, opal_output() will automatically create the file and
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* writing to it.
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*/
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OMPI_DECLSPEC void opal_output(int output_id, const char *format, ...);
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/**
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* Send output to a stream only if the passed verbosity level is
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* high enough.
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*
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* @param output_id Stream id returned from opal_output_open().
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* @param level Target verbosity level.
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* @param format printf-style format string.
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* @param varargs printf-style varargs list to fill the string
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* specified by the format parameter.
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*
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* Output is only sent to the stream if the current verbosity level
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* is greater than or equal to the level parameter. This mechanism
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* can be used to send "information" kinds of output to user
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* applications, but only when the user has asked for a high enough
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* verbosity level.
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*
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* It is never necessary to send a trailing "\n" in the strings to
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* this function; some streams requires newlines, others do not --
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* this function will append newlines as necessary.
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*
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* This function is really a convenience wrapper around checking the
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* current verbosity level set on the stream, and if the passed
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* level is less than or equal to the stream's verbosity level, this
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* function will effectively invoke opal_output to send the output to
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* the stream.
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*
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* @see opal_output_set_verbosity()
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*/
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OMPI_DECLSPEC void opal_output_verbose(int verbose_level, int output_id,
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const char *format, ...);
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/**
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* Set the verbosity level for a stream.
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*
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* @param output_id Stream id returned from opal_output_open().
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* @param level New verbosity level
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*
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* This function sets the verbosity level on a given stream. It
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* will be used for all future invocations of opal_output_verbose().
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*/
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OMPI_DECLSPEC void opal_output_set_verbosity(int output_id, int level);
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#if OMPI_ENABLE_DEBUG
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/**
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* Main macro for use in sending debugging output to output streams;
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* will be "compiled out" when OPAL is configured without
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* --enable-debug.
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*
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* @see opal_output()
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*/
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#define OPAL_OUTPUT(a) opal_output a
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/**
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* Macro for use in sending debugging output to the output
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* streams. Will be "compiled out" when OPAL is configured
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* without --enable-debug.
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*
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* @see opal_output_verbose()
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*/
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#define OPAL_OUTPUT_VERBOSE(a) opal_output_verbose a
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#else
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/**
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* Main macro for use in sending debugging output to output streams;
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* will be "compiled out" when OPAL is configured without
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* --enable-debug.
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*
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* @see opal_output()
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*/
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#define OPAL_OUTPUT(a)
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/**
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* Macro for use in sending debugging output to the output
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* streams. Will be "compiled out" when OPAL is configured
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* without --enable-debug.
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*
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* @see opal_output_verbose()
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*/
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#define OPAL_OUTPUT_VERBOSE(a)
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#endif
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#if defined(c_plusplus) || defined(__cplusplus)
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}
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#endif
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#endif /* OPAL_OUTPUT_H_ */
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