gecko-dev/include/timing.h

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C

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* The contents of this file are subject to the Netscape Public License
* Version 1.0 (the "NPL"); you may not use this file except in
* compliance with the NPL. You may obtain a copy of the NPL at
* http://www.mozilla.org/NPL/
*
* Software distributed under the NPL is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
* for the specific language governing rights and limitations under the
* NPL.
*
* The Initial Developer of this code under the NPL is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
* Reserved.
*/
#ifndef timing_h__
#define timing_h__
#include "prtypes.h"
#include "prtime.h"
PR_BEGIN_EXTERN_C
/**
* Write a timing message to the timing log module, using
* <tt>printf()</tt> formatting. The message will be pre-pended with
* thread and timing information. Do not use this function directly;
* rather, use the <tt>TIMING_MSG()</tt> macro, below.
* <p>
* This is based on NSPR2.0 logging, so it is not necessary to
* terminate messages with a newline.
*
* @fmtstr The <tt>printf()</tt>-style format string.
*/
extern void
TimingWriteMessage(const char* fmtstr, ...);
/**
* Queries whether the timing log is currently enabled.
*
* @return <tt>PR_TRUE</tt> if the timing log is currently enabled.
*/
extern PRBool
TimingIsEnabled(void);
/**
* Sets the timing log's state.
*
* @param enabled <tt>PR_TRUE</tt> to enable, <tt>PR_FALSE</tt> to
* disable.
*/
extern void
TimingSetEnabled(PRBool enabled);
/**
* Start a unique "clock" with the given name. If the clock already
* exists, this call will <i>not</i> re-start it.
*
* @param clock A C-string name for the clock.
*/
extern void
TimingStartClock(const char* clock);
/**
* Stop the "clock" with the given name, returning the elapsed
* time in <tt>result</tt>. This destroys the clock.
* <p>
* If the clock has already been stopped, this call will have
* no effect.
*
* @param result If successful, returns the time recorded on
* the clock (in microseconds).
* @param clock The C-string name of the clock to stop.
* @return <tt>PR_TRUE</tt> if the clock exists, was running,
* and was successfully stopped.
*/
extern PRBool
TimingStopClock(PRTime* result, const char* clock);
/**
* Return <tt>PR_TRUE</tt> if the clock with the specified
* name exists and is running.
*/
extern PRBool
TimingIsClockRunning(const char* clock);
/**
* Convert an elapsed time into a human-readable string.
*
* @param time An elapsed <tt>PRTime</tt> value.
* @param buffer The buffer to use for conversion.
* @param size The size of <tt>buffer</tt>.
* @return A pointer to <tt>buffer</tt>.
*/
extern char*
TimingElapsedTimeToString(PRTime time, char* buffer, PRUint32 size);
PR_END_EXTERN_C
#if defined(NO_TIMING)
#define TIMING_MESSAGE(args) ((void) 0)
#define TIMING_STARTCLOCK_NAME(op, name) ((void) 0)
#define TIMING_STOPCLOCK_NAME(op, name, cx, msg) ((void) 0)
#define TIMING_STARTCLOCK_OBJECT(op, obj) ((void) 0)
#define TIMING_STOPCLOCK_OBJECT(op, obj, cx, msg) ((void) 0)
#else /* !defined(NO_TIMING) */
/**
* Use this macro to log timing information. It uses the
* "double-parens" hack to allow you to pass arbitrarily formatted
* strings; e.g.,
*
* <pre>
* TIMING_MESSAGE(("cache,%s,not found", url->address));
* </pre>
*/
#define TIMING_MESSAGE(args) TimingWriteMessage args
/**
* Use this macro to start a "clock" on an object using a pointer
* to the object; e.g.,
*
* <PRE>
* TIMING_STARTCLOCK_OBJECT("http:request", URL_s);
* </PRE>
*
* The clock should be uniquely identified by the <tt>op</tt> and
* <tt>obj</tt> parameters.
*
* @param op A C-string that is the "operation" that is being
* performed.
* @param obj A pointer to an object.
*/
#define TIMING_STARTCLOCK_OBJECT(op, obj) \
do {\
char buf[256];\
PR_snprintf(buf, sizeof(buf), "%s,%08x", op, obj);\
TimingStartClock(buf);\
} while (0)
/**
* Use this macro to stop a "clock" on an object and print out
* a message that indicates the total elapsed time on the clock;
* e.g.,
*
* <PRE>
* TIMING_STOPCLOCK_OBJECT("http:request", URL_s, "ok");
* </PRE>
*
* The <tt>op</tt> and <tt>obj</tt> parameters are used to
* identify the clock to stop.
*
* @param op A C-string that is the "operation" that is being
* performed.
* @param obj A pointer to an object.
* @param cx A pointer to the MWContext.
* @param msg A message to include in the log entry.
*/
#define TIMING_STOPCLOCK_OBJECT(op, obj, cx, msg) \
do {\
char buf[256];\
PR_snprintf(buf, sizeof(buf), "%s,%08x", op, obj);\
if (TimingIsClockRunning(buf)) {\
PRTime tmElapsed;\
PRUint32 nElapsed;\
TimingStopClock(&tmElapsed, buf);\
LL_L2UI(nElapsed, tmElapsed);\
TimingWriteMessage("clock,%s,%ld,%08x,%s",\
buf, nElapsed, cx, msg);\
}\
} while (0)
/**
* Use this macro to start a "clock" on a "named" operation; e.g.,
*
* <PRE>
* TIMING_STARTCLOCK_NAME("http:request", "http://www.cnn.com");
* </PRE>
*
* The clock should be uniquely identified by the <tt>op</tt> and
* <tt>name</tt> parameters.
*
* @param op A C-string identifying the operation that is being
* performed.
* @param name A C-string that is the name for the timer.
*/
#define TIMING_STARTCLOCK_NAME(op, name) \
do {\
char buf[256];\
PR_snprintf(buf, sizeof(buf), "%s,%.64s", op, name);\
TimingStartClock(buf);\
} while (0)
/**
* Use this macro to stop a "clock" on a "named operation" and print out
* a message that indicates the total elapsed time on the clock;
* e.g.,
*
* <PRE>
* TIMING_STOPCLOCK_NAME("http:request", "http://www.cnn.com", "ok");
* </PRE>
*
* The <tt>op</tt> and <tt>name</tt> parameters are used to
* identify the clock to stop.
*
* @param op A C-string that is the "operation" that is being
* performed.
* @param name A C-string that is the name for the timer.
* @param msg A message to include in the log entry.
*/
#define TIMING_STOPCLOCK_NAME(op, name, cx, msg) \
do {\
char buf[256];\
PR_snprintf(buf, sizeof(buf), "%s,%.64s", op, name);\
if (TimingIsClockRunning(buf)) {\
PRTime tmElapsed;\
PRUint32 nElapsed;\
TimingStopClock(&tmElapsed, buf);\
LL_L2UI(nElapsed, tmElapsed);\
TimingWriteMessage("clock,%s,%ld,%08x,%s",\
buf, nElapsed, cx, msg);\
}\
} while (0)
#endif /* !defined(NO_TIMING) */
#endif /* timing_h__ */