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147 lines
5.2 KiB
C
147 lines
5.2 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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/*
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** File: prinrval.h
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** Description: API to interval timing functions of NSPR.
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**
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**
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** NSPR provides interval times that are independent of network time
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** of day values. Interval times are (in theory) accurate regardless
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** of host processing requirements and also very cheap to acquire. It
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** is expected that getting an interval time while in a synchronized
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** function (holding one's lock).
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**/
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#if !defined(prinrval_h)
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#define prinrval_h
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#include "prtypes.h"
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PR_BEGIN_EXTERN_C
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/**********************************************************************/
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/************************* TYPES AND CONSTANTS ************************/
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/**********************************************************************/
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typedef PRUint32 PRIntervalTime;
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/***********************************************************************
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** DEFINES: PR_INTERVAL_MIN
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** PR_INTERVAL_MAX
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** DESCRIPTION:
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** These two constants define the range (in ticks / second) of the
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** platform dependent type, PRIntervalTime. These constants bound both
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** the period and the resolution of a PRIntervalTime.
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***********************************************************************/
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#define PR_INTERVAL_MIN 1000UL
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#define PR_INTERVAL_MAX 100000UL
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/***********************************************************************
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** DEFINES: PR_INTERVAL_NO_WAIT
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** PR_INTERVAL_NO_TIMEOUT
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** DESCRIPTION:
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** Two reserved constants are defined in the PRIntervalTime namespace.
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** They are used to indicate that the process should wait no time (return
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** immediately) or wait forever (never time out), respectively.
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** Note: PR_INTERVAL_NO_TIMEOUT passed as input to PR_Connect is
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** interpreted as use the OS's connect timeout.
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**
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***********************************************************************/
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#define PR_INTERVAL_NO_WAIT 0UL
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#define PR_INTERVAL_NO_TIMEOUT 0xffffffffUL
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/**********************************************************************/
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/****************************** FUNCTIONS *****************************/
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/**********************************************************************/
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/***********************************************************************
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** FUNCTION: PR_IntervalNow
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** DESCRIPTION:
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** Return the value of NSPR's free running interval timer. That timer
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** can be used to establish epochs and determine intervals (be computing
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** the difference between two times).
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** INPUTS: void
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** OUTPUTS: void
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** RETURN: PRIntervalTime
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**
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** SIDE EFFECTS:
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** None
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** RESTRICTIONS:
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** The units of PRIntervalTime are platform dependent. They are chosen
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** such that they are appropriate for the host OS, yet provide sufficient
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** resolution and period to be useful to clients.
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** MEMORY: N/A
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** ALGORITHM: Platform dependent
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***********************************************************************/
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NSPR_API(PRIntervalTime) PR_IntervalNow(void);
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/***********************************************************************
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** FUNCTION: PR_TicksPerSecond
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** DESCRIPTION:
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** Return the number of ticks per second for PR_IntervalNow's clock.
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** The value will be in the range [PR_INTERVAL_MIN..PR_INTERVAL_MAX].
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** INPUTS: void
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** OUTPUTS: void
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** RETURN: PRUint32
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**
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** SIDE EFFECTS:
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** None
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** RESTRICTIONS:
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** None
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** MEMORY: N/A
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** ALGORITHM: N/A
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***********************************************************************/
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NSPR_API(PRUint32) PR_TicksPerSecond(void);
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/***********************************************************************
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** FUNCTION: PR_SecondsToInterval
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** PR_MillisecondsToInterval
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** PR_MicrosecondsToInterval
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** DESCRIPTION:
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** Convert standard clock units to platform dependent intervals.
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** INPUTS: PRUint32
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** OUTPUTS: void
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** RETURN: PRIntervalTime
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**
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** SIDE EFFECTS:
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** None
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** RESTRICTIONS:
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** Conversion may cause overflow, which is not reported.
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** MEMORY: N/A
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** ALGORITHM: N/A
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***********************************************************************/
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NSPR_API(PRIntervalTime) PR_SecondsToInterval(PRUint32 seconds);
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NSPR_API(PRIntervalTime) PR_MillisecondsToInterval(PRUint32 milli);
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NSPR_API(PRIntervalTime) PR_MicrosecondsToInterval(PRUint32 micro);
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/***********************************************************************
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** FUNCTION: PR_IntervalToSeconds
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** PR_IntervalToMilliseconds
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** PR_IntervalToMicroseconds
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** DESCRIPTION:
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** Convert platform dependent intervals to standard clock units.
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** INPUTS: PRIntervalTime
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** OUTPUTS: void
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** RETURN: PRUint32
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**
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** SIDE EFFECTS:
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** None
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** RESTRICTIONS:
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** Conversion may cause overflow, which is not reported.
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** MEMORY: N/A
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** ALGORITHM: N/A
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***********************************************************************/
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NSPR_API(PRUint32) PR_IntervalToSeconds(PRIntervalTime ticks);
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NSPR_API(PRUint32) PR_IntervalToMilliseconds(PRIntervalTime ticks);
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NSPR_API(PRUint32) PR_IntervalToMicroseconds(PRIntervalTime ticks);
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PR_END_EXTERN_C
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#endif /* !defined(prinrval_h) */
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/* prinrval.h */
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