mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-01 06:35:42 +00:00
173 lines
6.3 KiB
C
173 lines
6.3 KiB
C
/* -*- 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 */
|