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diff --git a/nsprpub/pr/include/prinrval.h b/nsprpub/pr/include/prinrval.h
new file mode 100644
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+++ b/nsprpub/pr/include/prinrval.h
@@ -0,0 +1,146 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+** 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.
+**  Note: PR_INTERVAL_NO_TIMEOUT passed as input to PR_Connect is 
+**  interpreted as use the OS's connect timeout.
+**  
+***********************************************************************/
+#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 */