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526 lines
15 KiB
C
526 lines
15 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 prcountr_h___
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#define prcountr_h___
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/*----------------------------------------------------------------------------
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** prcountr.h -- NSPR Instrumentation counters
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**
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** The NSPR Counter Feature provides a means to "count
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** something." Counters can be dynamically defined, incremented,
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** decremented, set, and deleted under application program
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** control.
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**
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** The Counter Feature is intended to be used as instrumentation,
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** not as operational data. If you need a counter for operational
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** data, use native integral types.
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**
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** Counters are 32bit unsigned intergers. On overflow, a counter
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** will wrap. No exception is recognized or reported.
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**
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** A counter can be dynamically created using a two level naming
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** convention. A "handle" is returned when the counter is
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** created. The counter can subsequently be addressed by its
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** handle. An API is provided to get an existing counter's handle
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** given the names with which it was originally created.
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** Similarly, a counter's name can be retrieved given its handle.
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**
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** The counter naming convention is a two-level hierarchy. The
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** QName is the higher level of the hierarchy; RName is the
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** lower level. RNames can be thought of as existing within a
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** QName. The same RName can exist within multiple QNames. QNames
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** are unique. The NSPR Counter is not a near-zero overhead
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** feature. Application designers should be aware of
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** serialization issues when using the Counter API. Creating a
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** counter locks a large asset, potentially causing a stall. This
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** suggest that applications should create counters at component
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** initialization, for example, and not create and destroy them
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** willy-nilly. ... You have been warned.
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**
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** Incrementing and Adding to counters uses atomic operations.
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** The performance of these operations will vary from platform
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** to platform. On platforms where atomic operations are not
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** supported the overhead may be substantial.
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**
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** When traversing the counter database with FindNext functions,
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** the instantaneous values of any given counter is that at the
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** moment of extraction. The state of the entire counter database
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** may not be viewed as atomic.
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**
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** The counter interface may be disabled (No-Op'd) at compile
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** time. When DEBUG is defined at compile time, the Counter
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** Feature is compiled into NSPR and applications invoking it.
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** When DEBUG is not defined, the counter macros compile to
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** nothing. To force the Counter Feature to be compiled into an
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** optimized build, define FORCE_NSPR_COUNTERS at compile time
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** for both NSPR and the application intending to use it.
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**
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** Application designers should use the macro form of the Counter
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** Feature methods to minimize performance impact in optimized
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** builds. The macros normally compile to nothing on optimized
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** builds.
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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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** Counter Feature macros in expressions.
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**
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** The Counter Feature is thread-safe and SMP safe.
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**
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** /lth. 09-Jun-1998.
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*/
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#include "prtypes.h"
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PR_BEGIN_EXTERN_C
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/*
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** Opaque counter handle type.
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** ... don't even think of looking in here.
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**
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*/
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typedef void * PRCounterHandle;
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#define PRCOUNTER_NAME_MAX 31
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#define PRCOUNTER_DESC_MAX 255
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/* -----------------------------------------------------------------------
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** FUNCTION: PR_DEFINE_COUNTER() -- Define a PRCounterHandle
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**
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** DESCRIPTION: PR_DEFINE_COUNTER() is used to define a counter
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** handle.
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**
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*/
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#define PR_DEFINE_COUNTER(name) PRCounterHandle name
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/* -----------------------------------------------------------------------
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** FUNCTION: PR_INIT_COUNTER_HANDLE() -- Set the value of a PRCounterHandle
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**
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** DESCRIPTION:
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** PR_INIT_COUNTER_HANDLE() sets the value of a PRCounterHandle
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** to value.
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**
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*/
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#if defined(DEBUG) || defined(FORCE_NSPR_COUNTERS)
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#define PR_INIT_COUNTER_HANDLE(handle,value)\
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(handle) = (PRCounterHandle)(value)
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#else
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#define PR_INIT_COUNTER_HANDLE(handle,value)
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#endif
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/* -----------------------------------------------------------------------
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** FUNCTION: PR_CreateCounter() -- Create a counter
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**
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** DESCRIPTION: PR_CreateCounter() creates a counter object and
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** initializes it to zero.
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**
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** The macro form takes as its first argument the name of the
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** PRCounterHandle to receive the handle returned from
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** PR_CreateCounter().
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**
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** INPUTS:
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** qName: The QName for the counter object. The maximum length
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** of qName is defined by PRCOUNTER_NAME_MAX
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**
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** rName: The RName for the counter object. The maximum length
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** of qName is defined by PRCOUNTER_NAME_MAX
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**
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** descrioption: The description of the counter object. The
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** maximum length of description is defined by
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** PRCOUNTER_DESC_MAX.
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**
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** OUTPUTS:
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**
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** RETURNS:
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** PRCounterHandle.
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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_COUNTERS)
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#define PR_CREATE_COUNTER(handle,qName,rName,description)\
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(handle) = PR_CreateCounter((qName),(rName),(description))
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#else
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#define PR_CREATE_COUNTER(handle,qName,rName,description)
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#endif
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NSPR_API(PRCounterHandle)
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PR_CreateCounter(
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const char *qName,
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const char *rName,
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const char *description
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);
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/* -----------------------------------------------------------------------
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** FUNCTION: PR_DestroyCounter() -- Destroy a counter object.
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**
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** DESCRIPTION: PR_DestroyCounter() removes a counter and
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** unregisters its handle from the counter database.
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**
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** INPUTS:
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** handle: the PRCounterHandle of the counter to be destroyed.
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**
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** OUTPUTS:
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** The counter is destroyed.
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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_COUNTERS)
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#define PR_DESTROY_COUNTER(handle) PR_DestroyCounter((handle))
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#else
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#define PR_DESTROY_COUNTER(handle)
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#endif
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NSPR_API(void)
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PR_DestroyCounter(
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PRCounterHandle handle
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);
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/* -----------------------------------------------------------------------
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** FUNCTION: PR_GetCounterHandleFromName() -- Retreive a
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** counter's handle give its name.
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**
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** DESCRIPTION: PR_GetCounterHandleFromName() retreives a
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** counter's handle from the counter database, given the name
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** the counter was originally created with.
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**
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** INPUTS:
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** qName: Counter's original QName.
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** rName: Counter's original RName.
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**
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** OUTPUTS:
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**
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** RETURNS:
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** PRCounterHandle or PRCounterError.
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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_COUNTERS)
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#define PR_GET_COUNTER_HANDLE_FROM_NAME(handle,qName,rName)\
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(handle) = PR_GetCounterHandleFromName((qName),(rName))
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#else
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#define PR_GET_COUNTER_HANDLE_FROM_NAME(handle,qName,rName)
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#endif
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NSPR_API(PRCounterHandle)
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PR_GetCounterHandleFromName(
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const char *qName,
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const char *rName
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);
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/* -----------------------------------------------------------------------
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** FUNCTION: PR_GetCounterNameFromHandle() -- Retreive a
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** counter's name, given its handle.
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**
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** DESCRIPTION: PR_GetCounterNameFromHandle() retreives a
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** counter's name given its handle.
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**
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** INPUTS:
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** qName: Where to store a pointer to qName.
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** rName: Where to store a pointer to rName.
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** description: Where to store a pointer to description.
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**
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** OUTPUTS: Pointers to the Counter Feature's copies of the names
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** used when the counters were created.
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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_COUNTERS)
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#define PR_GET_COUNTER_NAME_FROM_HANDLE(handle,qName,rName,description)\
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PR_GetCounterNameFromHandle((handle),(qName),(rName),(description))
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#else
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#define PR_GET_COUNTER_NAME_FROM_HANDLE(handle,qName,rName,description )
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#endif
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NSPR_API(void)
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PR_GetCounterNameFromHandle(
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PRCounterHandle handle,
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const char **qName,
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const char **rName,
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const char **description
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);
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/* -----------------------------------------------------------------------
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** FUNCTION: PR_IncrementCounter() -- Add one to the referenced
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** counter.
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**
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** DESCRIPTION: Add one to the referenced counter.
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**
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** INPUTS:
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** handle: The PRCounterHandle of the counter to be incremented
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**
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** OUTPUTS: The counter is incrementd.
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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_COUNTERS)
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#define PR_INCREMENT_COUNTER(handle) PR_IncrementCounter(handle)
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#else
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#define PR_INCREMENT_COUNTER(handle)
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#endif
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NSPR_API(void)
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PR_IncrementCounter(
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PRCounterHandle handle
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);
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/* -----------------------------------------------------------------------
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** FUNCTION: PR_DecrementCounter() -- Subtract one from the
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** referenced counter
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**
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** DESCRIPTION: Subtract one from the referenced counter.
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**
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** INPUTS:
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** handle: The PRCounterHandle of the coutner to be
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** decremented.
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**
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** OUTPUTS: the counter is decremented.
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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_COUNTERS)
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#define PR_DECREMENT_COUNTER(handle) PR_DecrementCounter(handle)
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#else
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#define PR_DECREMENT_COUNTER(handle)
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#endif
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NSPR_API(void)
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PR_DecrementCounter(
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PRCounterHandle handle
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);
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/* -----------------------------------------------------------------------
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** FUNCTION: PR_AddToCounter() -- Add a value to a counter.
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**
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** DESCRIPTION: Add value to the counter referenced by handle.
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**
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** INPUTS:
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** handle: the PRCounterHandle of the counter to be added to.
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**
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** value: the value to be added to the counter.
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**
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** OUTPUTS: new value for counter.
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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_COUNTERS)
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#define PR_ADD_TO_COUNTER(handle,value)\
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PR_AddToCounter((handle),(value))
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#else
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#define PR_ADD_TO_COUNTER(handle,value)
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#endif
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NSPR_API(void)
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PR_AddToCounter(
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PRCounterHandle handle,
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PRUint32 value
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);
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/* -----------------------------------------------------------------------
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** FUNCTION: PR_SubtractFromCounter() -- A value is subtracted
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** from a counter.
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**
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** DESCRIPTION:
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** Subtract a value from a counter.
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**
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** INPUTS:
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** handle: the PRCounterHandle of the counter to be subtracted
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** from.
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**
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** value: the value to be subtracted from the counter.
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**
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** OUTPUTS: new value for counter
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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_COUNTERS)
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#define PR_SUBTRACT_FROM_COUNTER(handle,value)\
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PR_SubtractFromCounter((handle),(value))
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#else
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#define PR_SUBTRACT_FROM_COUNTER(handle,value)
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#endif
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NSPR_API(void)
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PR_SubtractFromCounter(
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PRCounterHandle handle,
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PRUint32 value
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);
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/* -----------------------------------------------------------------------
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** FUNCTION: PR_GetCounter() -- Retreive the value of a counter
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**
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** DESCRIPTION:
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** Retreive the value of a counter.
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**
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** INPUTS:
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** handle: the PR_CounterHandle of the counter to be retreived
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**
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** OUTPUTS:
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**
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** RETURNS: The value of the referenced counter
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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_COUNTERS)
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#define PR_GET_COUNTER(counter,handle)\
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(counter) = PR_GetCounter((handle))
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#else
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#define PR_GET_COUNTER(counter,handle) 0
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#endif
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NSPR_API(PRUint32)
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PR_GetCounter(
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PRCounterHandle handle
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);
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/* -----------------------------------------------------------------------
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** FUNCTION: PR_SetCounter() -- Replace the content of counter
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** with value.
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**
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** DESCRIPTION: The contents of the referenced counter are
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** replaced by value.
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**
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** INPUTS:
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** handle: the PRCounterHandle of the counter whose contents
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** are to be replaced.
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**
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** value: the new value of the counter.
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**
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** OUTPUTS:
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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_COUNTERS)
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#define PR_SET_COUNTER(handle,value) PR_SetCounter((handle),(value))
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#else
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#define PR_SET_COUNTER(handle,value)
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#endif
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NSPR_API(void)
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PR_SetCounter(
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PRCounterHandle handle,
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PRUint32 value
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);
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/* -----------------------------------------------------------------------
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** FUNCTION: PR_FindNextCounterQname() -- Retreive the next QName counter
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** handle iterator
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**
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** DESCRIPTION:
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** PR_FindNextCounterQname() retreives the first or next Qname
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** the counter data base, depending on the value of handle. When
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** handle is NULL, the function attempts to retreive the first
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** QName handle in the database. When handle is a handle previosly
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** retreived QName handle, then the function attempts to retreive
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** the next QName handle.
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**
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** INPUTS:
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** handle: PRCounterHandle or NULL.
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**
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** OUTPUTS: returned
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**
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** RETURNS: PRCounterHandle or NULL when no more QName counter
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** handles are present.
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**
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** RESTRICTIONS:
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** A concurrent PR_CreateCounter() or PR_DestroyCounter() may
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** cause unpredictable results.
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**
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** A PRCounterHandle returned from this function may only be used
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** in another PR_FindNextCounterQname() function call; other
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** operations may cause unpredictable results.
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**
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*/
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#if defined(DEBUG) || defined(FORCE_NSPR_COUNTERS)
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#define PR_FIND_NEXT_COUNTER_QNAME(next,handle)\
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(next) = PR_FindNextCounterQname((handle))
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#else
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#define PR_FIND_NEXT_COUNTER_QNAME(next,handle) NULL
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#endif
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NSPR_API(PRCounterHandle)
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PR_FindNextCounterQname(
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PRCounterHandle handle
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);
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/* -----------------------------------------------------------------------
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** FUNCTION: PR_FindNextCounterRname() -- Retreive the next RName counter
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** handle iterator
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**
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** DESCRIPTION:
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** PR_FindNextCounterRname() retreives the first or next RNname
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** handle from the counter data base, depending on the
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** value of handle. When handle is NULL, the function attempts to
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** retreive the first RName handle in the database. When handle is
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** a handle previosly retreived RName handle, then the function
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** attempts to retreive the next RName handle.
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**
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** INPUTS:
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** handle: PRCounterHandle or NULL.
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** qhandle: PRCounterHandle of a previously aquired via
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** PR_FIND_NEXT_QNAME_HANDLE()
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**
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** OUTPUTS: returned
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**
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** RETURNS: PRCounterHandle or NULL when no more RName counter
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** handles are present.
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**
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** RESTRICTIONS:
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** A concurrent PR_CreateCounter() or PR_DestroyCounter() may
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** cause unpredictable results.
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**
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** A PRCounterHandle returned from this function may only be used
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** in another PR_FindNextCounterRname() function call; other
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** operations may cause unpredictable results.
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**
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*/
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#if defined(DEBUG) || defined(FORCE_NSPR_COUNTERS)
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#define PR_FIND_NEXT_COUNTER_RNAME(next,rhandle,qhandle)\
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(next) = PR_FindNextCounterRname((rhandle),(qhandle))
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#else
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#define PR_FIND_NEXT_COUNTER_RNAME(next,rhandle,qhandle)
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#endif
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NSPR_API(PRCounterHandle)
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PR_FindNextCounterRname(
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PRCounterHandle rhandle,
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PRCounterHandle qhandle
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);
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PR_END_EXTERN_C
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#endif /* prcountr_h___ */
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