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647 lines
22 KiB
C
647 lines
22 KiB
C
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef prtrace_h___
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#define prtrace_h___
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/*
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** prtrace.h -- NSPR's Trace Facility.
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**
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** The Trace Facility provides a means to trace application
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** program events within a process. When implementing an
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** application program an engineer may insert a "Trace" function
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** call, passing arguments to be traced. The "Trace" function
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** combines the user trace data with identifying data and
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** writes this data in time ordered sequence into a circular
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** in-memory buffer; when the buffer fills, it wraps.
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**
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** Functions are provided to set and/or re-configure the size of
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** the trace buffer, control what events are recorded in the
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** buffer, enable and disable tracing based on specific user
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** supplied data and other control functions. Methods are provided
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** to record the trace entries in the in-memory trace buffer to
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** a file.
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**
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** Tracing may cause a performance degredation to the application
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** depending on the number and placement of calls to the tracing
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** facility. When tracing is compiled in and all tracing is
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** disabled via the runtime controls, the overhead should be
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** minimal. ... Famous last words, eh?
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**
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** When DEBUG is defined at compile time, the Trace Facility is
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** compiled as part of NSPR and any application using NSPR's
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** header files will have tracing compiled in. When DEBUG is not
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** defined, the Trace Facility is not compiled into NSPR nor
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** exported in its header files. If the Trace Facility is
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** desired in a non-debug build, then FORCE_NSPR_TRACE may be
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** defined at compile time for both the optimized build of NSPR
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** and the application. NSPR and any application using NSPR's
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** Trace Facility must be compiled with the same level of trace
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** conditioning or unresolved references may be realized at link
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** time.
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**
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** For any of the Trace Facility methods that requires a trace
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** handle as an input argument, the caller must ensure that the
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** trace handle argument is valid. An invalid trace handle
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** argument may cause unpredictable results.
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**
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** Trace Facility methods are thread-safe and SMP safe.
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**
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** Users of the Trace Facility should use the defined macros to
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** invoke trace methods, not the function calls directly. e.g.
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** PR_TRACE( h1,0,1,2, ...); not PR_Trace(h1,0,1,2, ...);
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**
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** Application designers should be aware of the effects of
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** debug and optimized build differences when using result of the
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** Trace Facility macros in expressions.
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**
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** See Also: prcountr.h
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**
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** /lth. 08-Jun-1998.
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*/
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#include "prtypes.h"
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#include "prthread.h"
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#include "prtime.h"
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PR_BEGIN_EXTERN_C
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/*
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** Opaque type for the trace handle
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** ... Don't even think about looking in here.
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**
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*/
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typedef void * PRTraceHandle;
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/*
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** PRTraceEntry -- A trace entry in the in-memory trace buffer
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** looks like this.
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**
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*/
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typedef struct PRTraceEntry
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{
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PRThread *thread; /* The thread creating the trace entry */
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PRTraceHandle handle; /* PRTraceHandle creating the trace entry */
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PRTime time; /* Value of PR_Now() at time of trace entry */
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PRUint32 userData[8]; /* user supplied trace data */
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} PRTraceEntry;
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/*
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** PRTraceOption -- command operands to
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** PR_[Set|Get]TraceOption(). See descriptive meanings there.
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**
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*/
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typedef enum PRTraceOption
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{
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PRTraceBufSize,
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PRTraceEnable,
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PRTraceDisable,
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PRTraceSuspend,
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PRTraceResume,
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PRTraceSuspendRecording,
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PRTraceResumeRecording,
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PRTraceLockHandles,
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PRTraceUnLockHandles,
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PRTraceStopRecording
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} PRTraceOption;
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/* -----------------------------------------------------------------------
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** FUNCTION: PR_DEFINE_TRACE() -- Define a PRTraceHandle
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**
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** DESCRIPTION: PR_DEFINE_TRACE() is used to define a trace
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** handle.
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**
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*/
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#define PR_DEFINE_TRACE(name) PRTraceHandle name
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/* -----------------------------------------------------------------------
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** FUNCTION: PR_INIT_TRACE_HANDLE() -- Set the value of a PRTraceHandle
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**
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** DESCRIPTION:
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** PR_INIT_TRACE_HANDLE() sets the value of a PRTraceHandle
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** to value. e.g. PR_INIT_TRACE_HANDLE( myHandle, NULL );
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**
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*/
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#if defined (DEBUG) || defined (FORCE_NSPR_TRACE)
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#define PR_INIT_TRACE_HANDLE(handle,value)\
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(handle) = (PRCounterHandle)(value)
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#else
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#define PR_INIT_TRACE_HANDLE(handle,value)
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#endif
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/* -----------------------------------------------------------------------
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** FUNCTION: PR_CreateTrace() -- Create a trace handle
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**
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** DESCRIPTION:
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** PR_CreateTrace() creates a new trace handle. Tracing is
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** enabled for this handle when it is created. The trace handle
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** is intended for use in other Trace Facility calls.
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**
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** PR_CreateTrace() registers the QName, RName and description
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** data so that this data can be retrieved later.
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**
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** INPUTS:
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** qName: pointer to string. QName for this trace handle.
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**
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** rName: pointer to string. RName for this trace handle.
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**
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** description: pointer to string. Descriptive data about this
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** trace handle.
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**
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** OUTPUTS:
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** Creates the trace handle.
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** Registers the QName and RName with the trace facility.
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**
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** RETURNS:
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** PRTraceHandle
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**
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** RESTRICTIONS:
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** qName is limited to 31 characters.
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** rName is limited to 31 characters.
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** description is limited to 255 characters.
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**
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*/
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#define PRTRACE_NAME_MAX 31
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#define PRTRACE_DESC_MAX 255
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#if defined (DEBUG) || defined (FORCE_NSPR_TRACE)
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#define PR_CREATE_TRACE(handle,qName,rName,description)\
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(handle) = PR_CreateTrace((qName),(rName),(description))
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#else
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#define PR_CREATE_TRACE(handle,qName,rName,description)
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#endif
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NSPR_API(PRTraceHandle)
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PR_CreateTrace(
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const char *qName, /* QName for this trace handle */
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const char *rName, /* RName for this trace handle */
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const char *description /* description for this trace handle */
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);
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/* -----------------------------------------------------------------------
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** FUNCTION: PR_DestroyTrace() -- Destroy a trace handle
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**
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** DESCRIPTION:
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** PR_DestroyTrace() removes the referenced trace handle and
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** associated QName, RName and description data from the Trace
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** Facility.
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**
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** INPUTS: handle. A PRTraceHandle
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**
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** OUTPUTS:
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** The trace handle is unregistered.
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** The QName, RName and description are removed.
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**
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** RETURNS: void
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**
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** RESTRICTIONS:
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**
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*/
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#if defined (DEBUG) || defined (FORCE_NSPR_TRACE)
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#define PR_DESTROY_TRACE(handle)\
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PR_DestroyTrace((handle))
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#else
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#define PR_DESTROY_TRACE(handle)
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#endif
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NSPR_API(void)
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PR_DestroyTrace(
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PRTraceHandle handle /* Handle to be destroyed */
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);
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/* -----------------------------------------------------------------------
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** FUNCTION: PR_Trace() -- Make a trace entry in the in-memory trace
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**
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** DESCRIPTION:
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** PR_Trace() makes an entry in the in-memory trace buffer for
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** the referenced trace handle. The next logically available
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** PRTraceEntry is used; when the next trace entry would overflow
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** the trace table, the table wraps.
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**
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** PR_Trace() for a specific trace handle may be disabled by
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** calling PR_SetTraceOption() specifying PRTraceDisable for the
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** trace handle to be disabled.
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**
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** INPUTS:
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** handle: PRTraceHandle. The trace handle for this trace.
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**
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** userData[0..7]: unsigned 32bit integers. user supplied data
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** that is copied into the PRTraceEntry
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**
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** OUTPUTS:
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** A PRTraceEntry is (conditionally) formatted in the in-memory
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** trace buffer.
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**
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** RETURNS: void.
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**
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** RESTRICTIONS:
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**
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*/
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#if defined (DEBUG) || defined (FORCE_NSPR_TRACE)
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#define PR_TRACE(handle,ud0,ud1,ud2,ud3,ud4,ud5,ud6,ud7)\
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PR_Trace((handle),(ud0),(ud1),(ud2),(ud3),(ud4),(ud5),(ud6),(ud7))
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#else
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#define PR_TRACE(handle,ud0,ud1,ud2,ud3,ud4,ud5,ud6,ud7)
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#endif
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NSPR_API(void)
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PR_Trace(
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PRTraceHandle handle, /* use this trace handle */
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PRUint32 userData0, /* User supplied data word 0 */
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PRUint32 userData1, /* User supplied data word 1 */
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PRUint32 userData2, /* User supplied data word 2 */
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PRUint32 userData3, /* User supplied data word 3 */
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PRUint32 userData4, /* User supplied data word 4 */
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PRUint32 userData5, /* User supplied data word 5 */
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PRUint32 userData6, /* User supplied data word 6 */
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PRUint32 userData7 /* User supplied data word 7 */
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);
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/* -----------------------------------------------------------------------
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** FUNCTION: PR_SetTraceOption() -- Control the Trace Facility
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**
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** DESCRIPTION:
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** PR_SetTraceOption() controls the Trace Facility. Depending on
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** command and value, attributes of the Trace Facility may be
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** changed.
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**
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** INPUTS:
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** command: An enumerated value in the set of PRTraceOption.
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** value: pointer to the data to be set. Type of the data is
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** dependent on command; for each value of command, the type
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** and meaning of dereferenced value is shown.
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**
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** PRTraceBufSize: unsigned long: the size of the trace buffer,
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** in bytes.
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**
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** PRTraceEnable: PRTraceHandle. The trace handle to be
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** enabled.
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**
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** PRTraceDisable: PRTraceHandle. The trace handle to be
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** disabled.
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**
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** PRTraceSuspend: void. value must be NULL. All tracing is
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** suspended.
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**
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** PRTraceResume: void. value must be NULL. Tracing for all
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** previously enabled, prior to a PRTraceSuspend, is resumed.
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**
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** PRTraceStopRecording: void. value must be NULL. If recording
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** (see: ** PR_RecordTraceEntries()) is being done,
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** PRTraceStopRecording causes PR_RecordTraceEntries() to return
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** to its caller. If recording is not being done, this function
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** has no effect.
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**
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** PRTraceSuspendRecording: void. Must be NULL. If recording is
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** being done, PRTraceSuspendRecording causes further writes to
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** the trace file to be suspended. Data in the in-memory
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** trace buffer that would ordinarily be written to the
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** trace file will not be written. Trace entries will continue
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** to be entered in the in-memory buffer. If the Trace Facility
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** recording is already in a suspended state, the call has no
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** effect.
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**
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** PRTraceResumeRecording: void. value must be NULL. If
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** recording for the Trace Facility has been previously been
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** suspended, this causes recording to resume. Recording resumes
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** with the next in-memory buffer segment that would be written
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** if trace recording had not been suspended. If recording is
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** not currently suspended, the call has no effect.
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**
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** PRTraceLockHandles: void. value must be NULL. Locks the
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** trace handle lock. While the trace handle lock is held,
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** calls to PR_CreateTrace() will block until the lock is
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** released.
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**
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** PRTraceUnlockHandles: void. value must be NULL. Unlocks the
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** trace handle lock.
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**
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** OUTPUTS:
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** The operation of the Trace Facility may be changed.
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**
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** RETURNS: void
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**
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** RESTRICTIONS:
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**
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*/
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#if defined (DEBUG) || defined (FORCE_NSPR_TRACE)
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#define PR_SET_TRACE_OPTION(command,value)\
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PR_SetTraceOption((command),(value))
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#else
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#define PR_SET_TRACE_OPTION(command,value)
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#endif
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NSPR_API(void)
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PR_SetTraceOption(
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PRTraceOption command, /* One of the enumerated values */
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void *value /* command value or NULL */
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);
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/* -----------------------------------------------------------------------
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** FUNCTION: PR_GetTraceOption() -- Retrieve settings from the Trace Facility
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**
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** DESCRIPTION:
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** PR_GetTraceOption() retrieves the current setting of the
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** Trace Facility control depending on command.
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**
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**
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** PRTraceBufSize: unsigned long: the size of the trace buffer,
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** in bytes.
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**
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**
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** INPUTS:
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** command: one of the enumerated values in PRTraceOptions
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** valid for PR_GetTraceOption().
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**
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** OUTPUTS:
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** dependent on command.
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**
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** RETURNS: void
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**
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** RESTRICTIONS:
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**
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*/
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#if defined (DEBUG) || defined (FORCE_NSPR_TRACE)
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#define PR_GET_TRACE_OPTION(command,value)\
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PR_GetTraceOption((command),(value))
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#else
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#define PR_GET_TRACE_OPTION(command,value)
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#endif
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NSPR_API(void)
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PR_GetTraceOption(
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PRTraceOption command, /* One of the enumerated values */
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void *value /* command value or NULL */
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);
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/* -----------------------------------------------------------------------
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** FUNCTION: PR_GetTraceHandleFromName() -- Retrieve an existing
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** handle by name.
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**
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** DESCRIPTION:
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** PR_GetTraceHandleFromName() retreives an existing tracehandle
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** using the name specified by qName and rName.
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**
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** INPUTS:
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** qName: pointer to string. QName for this trace handle.
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**
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** rName: pointer to string. RName for this trace handle.
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**
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**
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** OUTPUTS: returned.
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**
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** RETURNS:
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** PRTraceHandle associated with qName and rName or NULL when
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** there is no match.
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**
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** RESTRICTIONS:
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**
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*/
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#if defined (DEBUG) || defined (FORCE_NSPR_TRACE)
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#define PR_GET_TRACE_HANDLE_FROM_NAME(handle,qName,rName)\
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(handle) = PR_GetTraceHandleFromName((qName),(rName))
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#else
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#define PR_GET_TRACE_HANDLE_FROM_NAME(handle,qName,rName)
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#endif
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NSPR_API(PRTraceHandle)
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PR_GetTraceHandleFromName(
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const char *qName, /* QName search argument */
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const char *rName /* RName search argument */
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);
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/* -----------------------------------------------------------------------
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** FUNCTION: PR_GetTraceNameFromHandle() -- Retreive trace name
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** by bandle.
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**
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** DESCRIPTION:
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** PR_GetTraceNameFromHandle() retreives the existing qName,
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** rName, and description for the referenced trace handle.
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**
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** INPUTS: handle: PRTraceHandle.
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**
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** OUTPUTS: pointers to the Trace Facility's copy of qName,
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** rName and description. ... Don't mess with these values.
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** They're mine.
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**
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** RETURNS: void
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**
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** RESTRICTIONS:
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**
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*/
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#if defined (DEBUG) || defined (FORCE_NSPR_TRACE)
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#define PR_GET_TRACE_NAME_FROM_HANDLE(handle,qName,rName,description)\
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PR_GetTraceNameFromHandle((handle),(qName),(rName),(description))
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#else
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#define PR_GET_TRACE_NAME_FROM_HANDLE(handle,qName,rName,description)
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#endif
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NSPR_API(void)
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PR_GetTraceNameFromHandle(
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PRTraceHandle handle, /* handle as search argument */
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const char **qName, /* pointer to associated QName */
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const char **rName, /* pointer to associated RName */
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const char **description /* pointer to associated description */
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);
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/* -----------------------------------------------------------------------
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** FUNCTION: PR_FindNextTraceQname() -- Retrieive a QName handle
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** iterator.
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**
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** DESCRIPTION:
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** PR_FindNextTraceQname() retreives the first or next trace
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** QName handle, depending on the value of handle, from the trace
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** database. The PRTraceHandle returned can be used as an
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** iterator to traverse the QName handles in the Trace database.
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**
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** INPUTS:
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** handle: When NULL, PR_FindNextQname() returns the first QName
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** handle. When a handle is a valid PRTraceHandle previously
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** retreived using PR_FindNextQname() the next QName handle is
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** retreived.
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**
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** OUTPUTS: returned.
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**
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** RETURNS:
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** PRTraceHandle or NULL when there are no trace handles.
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**
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** RESTRICTIONS:
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** Iterating thru the trace handles via FindFirst/FindNext
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** should be done under protection of the trace handle lock.
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** See: PR_SetTraceOption( PRLockTraceHandles ).
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**
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*/
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#if defined (DEBUG) || defined (FORCE_NSPR_TRACE)
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#define PR_FIND_NEXT_TRACE_QNAME(next,handle)\
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(next) = PR_FindNextTraceQname((handle))
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#else
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#define PR_FIND_NEXT_TRACE_QNAME(next,handle)
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#endif
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NSPR_API(PRTraceHandle)
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PR_FindNextTraceQname(
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PRTraceHandle handle
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);
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/* -----------------------------------------------------------------------
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** FUNCTION: PR_FindNextTraceRname() -- Retrieive an RName handle
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** iterator.
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**
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** DESCRIPTION:
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** PR_FindNextTraceRname() retreives the first or next trace
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** RName handle, depending on the value of handle, from the trace
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** database. The PRTraceHandle returned can be used as an
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** iterator to traverse the RName handles in the Trace database.
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**
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** INPUTS:
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** rhandle: When NULL, PR_FindNextRname() returns the first
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** RName handle. When a handle is a valid PRTraceHandle
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** previously retreived using PR_FindNextRname() the next RName
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** handle is retreived.
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** qhandle: A valid PRTraceHandle retruned from a previous call
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** to PR_FIND_NEXT_TRACE_QNAME().
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**
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** OUTPUTS: returned.
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**
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** RETURNS:
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** PRTraceHandle or NULL when there are no trace handles.
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**
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** RESTRICTIONS:
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** Iterating thru the trace handles via FindNext should be done
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** under protection of the trace handle lock. See: (
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** PR_SetTraceOption( PRLockTraceHandles ).
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**
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|
*/
|
|
#if defined (DEBUG) || defined (FORCE_NSPR_TRACE)
|
|
#define PR_FIND_NEXT_TRACE_RNAME(next,rhandle,qhandle)\
|
|
(next) = PR_FindNextTraceRname((rhandle),(qhandle))
|
|
#else
|
|
#define PR_FIND_NEXT_TRACE_RNAME(next,rhandle,qhandle)
|
|
#endif
|
|
|
|
NSPR_API(PRTraceHandle)
|
|
PR_FindNextTraceRname(
|
|
PRTraceHandle rhandle,
|
|
PRTraceHandle qhandle
|
|
);
|
|
|
|
/* -----------------------------------------------------------------------
|
|
** FUNCTION: PR_RecordTraceEntries() -- Write trace entries to external media
|
|
**
|
|
** DESCRIPTION:
|
|
** PR_RecordTraceEntries() causes entries in the in-memory trace
|
|
** buffer to be written to external media.
|
|
**
|
|
** When PR_RecordTraceEntries() is called from an application
|
|
** thread, the function appears to block until another thread
|
|
** calls PR_SetTraceOption() with the PRTraceStopRecording
|
|
** option. This suggests that PR_RecordTraceEntries() should be
|
|
** called from a user supplied thread whose only job is to
|
|
** record trace entries.
|
|
**
|
|
** The environment variable NSPR_TRACE_LOG controls the operation
|
|
** of this function. When NSPR_TRACE_LOG is not defined in the
|
|
** environment, no recording of trace entries occurs. When
|
|
** NSPR_TRACE_LOG is defined, the value of its definition must be
|
|
** the filename of the file to receive the trace entry buffer.
|
|
**
|
|
** PR_RecordTraceEntries() attempts to record the in-memory
|
|
** buffer to a file, subject to the setting of the environment
|
|
** variable NSPR_TRACE_LOG. It is possible because of system
|
|
** load, the thread priority of the recording thread, number of
|
|
** active trace records being written over time, and other
|
|
** variables that some trace records can be lost. ... In other
|
|
** words: don't bet the farm on getting everything.
|
|
**
|
|
** INPUTS: none
|
|
**
|
|
** OUTPUTS: none
|
|
**
|
|
** RETURNS: PR_STATUS
|
|
** PR_SUCCESS no errors were found.
|
|
** PR_FAILURE errors were found.
|
|
**
|
|
** RESTRICTIONS:
|
|
** Only one thread can call PR_RecordTraceEntries() within a
|
|
** process.
|
|
**
|
|
** On error, PR_RecordTraceEntries() may return prematurely.
|
|
**
|
|
*/
|
|
#if defined (DEBUG) || defined (FORCE_NSPR_TRACE)
|
|
#define PR_RECORD_TRACE_ENTRIES()\
|
|
PR_RecordTraceEntries()
|
|
#else
|
|
#define PR_RECORD_TRACE_ENTRIES()
|
|
#endif
|
|
|
|
NSPR_API(void)
|
|
PR_RecordTraceEntries(
|
|
void
|
|
);
|
|
|
|
/* -----------------------------------------------------------------------
|
|
** FUNCTION: PR_GetTraceEntries() -- Retreive trace entries from
|
|
** the Trace Facility
|
|
**
|
|
** DESCRIPTION:
|
|
** PR_GetTraceEntries() retreives trace entries from the Trace
|
|
** Facility. Up to count trace entries are copied from the Trace
|
|
** Facility into buffer. Only those trace entries that have not
|
|
** been copied via a previous call to PR_GetTraceEntries() are
|
|
** copied. The actual number copied is placed in the PRInt32
|
|
** variable pointed to by found.
|
|
**
|
|
** If more than count trace entries have entered the Trace
|
|
** Facility since the last call to PR_GetTraceEntries()
|
|
** a lost data condition is returned. In this case, the most
|
|
** recent count trace entries are copied into buffer and found is
|
|
** set to count.
|
|
**
|
|
** INPUTS:
|
|
** count. The number of trace entries to be copied into buffer.
|
|
**
|
|
**
|
|
** OUTPUTS:
|
|
** buffer. An array of PRTraceEntries. The buffer is supplied
|
|
** by the caller.
|
|
**
|
|
** found: 32bit signed integer. The number of PRTraceEntries
|
|
** actually copied. found is always less than or equal to count.
|
|
**
|
|
** RETURNS:
|
|
** zero when there is no lost data.
|
|
** non-zero when some PRTraceEntries have been lost.
|
|
**
|
|
** RESTRICTIONS:
|
|
** This is a real performance pig. The copy out operation is bad
|
|
** enough, but depending on then frequency of calls to the
|
|
** function, serious performance impact to the operating
|
|
** application may be realized. ... YMMV.
|
|
**
|
|
*/
|
|
#if defined (DEBUG) || defined (FORCE_NSPR_TRACE)
|
|
#define PR_GET_TRACE_ENTRIES(buffer,count,found)\
|
|
PR_GetTraceEntries((buffer),(count),(found))
|
|
#else
|
|
#define PR_GET_TRACE_ENTRIES(buffer,count,found)
|
|
#endif
|
|
|
|
NSPR_API(PRIntn)
|
|
PR_GetTraceEntries(
|
|
PRTraceEntry *buffer, /* where to write output */
|
|
PRInt32 count, /* number to get */
|
|
PRInt32 *found /* number you got */
|
|
);
|
|
|
|
PR_END_EXTERN_C
|
|
|
|
#endif /* prtrace_h___ */
|
|
|