pjs/nsprpub/pr/include/prinrval.h

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/*
* The contents of this file are subject to the Mozilla Public
* License Version 1.1 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code is the Netscape Portable Runtime (NSPR).
*
* The Initial Developer of the Original Code is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998-2000 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the
* terms of the GNU General Public License Version 2 or later (the
* "GPL"), in which case the provisions of the GPL are applicable
* instead of those above. If you wish to allow use of your
* version of this file only under the terms of the GPL and not to
* allow others to use your version of this file under the MPL,
* indicate your decision by deleting the provisions above and
* replace them with the notice and other provisions required by
* the GPL. If you do not delete the provisions above, a recipient
* may use your version of this file under either the MPL or the
* GPL.
*/
/*
** File: prinrval.h
** Description: API to interval timing functions of NSPR.
**
**
** NSPR provides interval times that are independent of network time
** of day values. Interval times are (in theory) accurate regardless
** of host processing requirements and also very cheap to acquire. It
** is expected that getting an interval time while in a synchronized
** function (holding one's lock).
**/
#if !defined(prinrval_h)
#define prinrval_h
#include "prtypes.h"
PR_BEGIN_EXTERN_C
/**********************************************************************/
/************************* TYPES AND CONSTANTS ************************/
/**********************************************************************/
typedef PRUint32 PRIntervalTime;
/***********************************************************************
** DEFINES: PR_INTERVAL_MIN
** PR_INTERVAL_MAX
** DESCRIPTION:
** These two constants define the range (in ticks / second) of the
** platform dependent type, PRIntervalTime. These constants bound both
** the period and the resolution of a PRIntervalTime.
***********************************************************************/
#define PR_INTERVAL_MIN 1000UL
#define PR_INTERVAL_MAX 100000UL
/***********************************************************************
** DEFINES: PR_INTERVAL_NO_WAIT
** PR_INTERVAL_NO_TIMEOUT
** DESCRIPTION:
** Two reserved constants are defined in the PRIntervalTime namespace.
** They are used to indicate that the process should wait no time (return
** immediately) or wait forever (never time out), respectively.
***********************************************************************/
#define PR_INTERVAL_NO_WAIT 0UL
#define PR_INTERVAL_NO_TIMEOUT 0xffffffffUL
/**********************************************************************/
/****************************** FUNCTIONS *****************************/
/**********************************************************************/
/***********************************************************************
** FUNCTION: PR_IntervalNow
** DESCRIPTION:
** Return the value of NSPR's free running interval timer. That timer
** can be used to establish epochs and determine intervals (be computing
** the difference between two times).
** INPUTS: void
** OUTPUTS: void
** RETURN: PRIntervalTime
**
** SIDE EFFECTS:
** None
** RESTRICTIONS:
** The units of PRIntervalTime are platform dependent. They are chosen
** such that they are appropriate for the host OS, yet provide sufficient
** resolution and period to be useful to clients.
** MEMORY: N/A
** ALGORITHM: Platform dependent
***********************************************************************/
NSPR_API(PRIntervalTime) PR_IntervalNow(void);
/***********************************************************************
** FUNCTION: PR_TicksPerSecond
** DESCRIPTION:
** Return the number of ticks per second for PR_IntervalNow's clock.
** The value will be in the range [PR_INTERVAL_MIN..PR_INTERVAL_MAX].
** INPUTS: void
** OUTPUTS: void
** RETURN: PRUint32
**
** SIDE EFFECTS:
** None
** RESTRICTIONS:
** None
** MEMORY: N/A
** ALGORITHM: N/A
***********************************************************************/
NSPR_API(PRUint32) PR_TicksPerSecond(void);
/***********************************************************************
** FUNCTION: PR_SecondsToInterval
** PR_MillisecondsToInterval
** PR_MicrosecondsToInterval
** DESCRIPTION:
** Convert standard clock units to platform dependent intervals.
** INPUTS: PRUint32
** OUTPUTS: void
** RETURN: PRIntervalTime
**
** SIDE EFFECTS:
** None
** RESTRICTIONS:
** Conversion may cause overflow, which is not reported.
** MEMORY: N/A
** ALGORITHM: N/A
***********************************************************************/
NSPR_API(PRIntervalTime) PR_SecondsToInterval(PRUint32 seconds);
NSPR_API(PRIntervalTime) PR_MillisecondsToInterval(PRUint32 milli);
NSPR_API(PRIntervalTime) PR_MicrosecondsToInterval(PRUint32 micro);
/***********************************************************************
** FUNCTION: PR_IntervalToSeconds
** PR_IntervalToMilliseconds
** PR_IntervalToMicroseconds
** DESCRIPTION:
** Convert platform dependent intervals to standard clock units.
** INPUTS: PRIntervalTime
** OUTPUTS: void
** RETURN: PRUint32
**
** SIDE EFFECTS:
** None
** RESTRICTIONS:
** Conversion may cause overflow, which is not reported.
** MEMORY: N/A
** ALGORITHM: N/A
***********************************************************************/
NSPR_API(PRUint32) PR_IntervalToSeconds(PRIntervalTime ticks);
NSPR_API(PRUint32) PR_IntervalToMilliseconds(PRIntervalTime ticks);
NSPR_API(PRUint32) PR_IntervalToMicroseconds(PRIntervalTime ticks);
PR_END_EXTERN_C
#endif /* !defined(prinrval_h) */
/* prinrval.h */