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Diffstat (limited to 'nsprpub/pr/include/obsolete/pralarm.h')
| -rw-r--r-- | nsprpub/pr/include/obsolete/pralarm.h | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/nsprpub/pr/include/obsolete/pralarm.h b/nsprpub/pr/include/obsolete/pralarm.h new file mode 100644 index 000000000..959e74bed --- /dev/null +++ b/nsprpub/pr/include/obsolete/pralarm.h @@ -0,0 +1,162 @@ +/* -*- 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: pralarm.h +** Description: API to periodic alarms. +** +** +** Alarms are defined to invoke some client specified function at +** a time in the future. The notification may be a one time event +** or repeated at a fixed interval. The interval at which the next +** notification takes place may be modified by the client code only +** during the respective notification. +** +** The notification is delivered on a thread that is part of the +** alarm context (PRAlarm). The thread will inherit the priority +** of the Alarm creator. +** +** Any number of periodic alarms (PRAlarmID) may be created within +** the context of a single alarm (PRAlarm). The notifications will be +** scheduled as close to the desired time as possible. +** +** Repeating periodic notifies are expected to run at a fixed rate. +** That rate is expressed as some number of notifies per period where +** the period is much larger than a PRIntervalTime (see prinrval.h). +*/ + +#if !defined(pralarm_h) +#define pralarm_h + +#include "prtypes.h" +#include "prinrval.h" + + +PR_BEGIN_EXTERN_C + +/**********************************************************************/ +/************************* TYPES AND CONSTANTS ************************/ +/**********************************************************************/ + +typedef struct PRAlarm PRAlarm; +typedef struct PRAlarmID PRAlarmID; + +typedef PRBool (PR_CALLBACK *PRPeriodicAlarmFn)( + PRAlarmID *id, void *clientData, PRUint32 late); + +/**********************************************************************/ +/****************************** FUNCTIONS *****************************/ +/**********************************************************************/ + +/*********************************************************************** +** FUNCTION: PR_CreateAlarm +** DESCRIPTION: +** Create an alarm context. +** INPUTS: void +** OUTPUTS: None +** RETURN: PRAlarm* +** +** SIDE EFFECTS: +** This creates an alarm context, which is an object used for subsequent +** notification creations. It also creates a thread that will be used to +** deliver the notifications that are expected to be defined. The client +** is resposible for destroying the context when appropriate. +** RESTRICTIONS: +** None. +** MEMORY: The object (PRAlarm) and a thread to support notifications. +** ALGORITHM: N/A +***********************************************************************/ +NSPR_API(PRAlarm*) PR_CreateAlarm(void); + +/*********************************************************************** +** FUNCTION: PR_DestroyAlarm +** DESCRIPTION: +** Destroys the context created by PR_CreateAlarm(). +** INPUTS: PRAlarm* +** OUTPUTS: None +** RETURN: PRStatus +** +** SIDE EFFECTS: +** This destroys the context that was created by PR_CreateAlarm(). +** If there are any active alarms (PRAlarmID), they will be cancelled. +** Once that is done, the thread that was used to deliver the alarms +** will be joined. +** RESTRICTIONS: +** None. +** MEMORY: N/A +** ALGORITHM: N/A +***********************************************************************/ +NSPR_API(PRStatus) PR_DestroyAlarm(PRAlarm *alarm); + +/*********************************************************************** +** FUNCTION: PR_SetAlarm +** DESCRIPTION: +** Creates a periodic notifier that is to be delivered to a specified +** function at some fixed interval. +** INPUTS: PRAlarm *alarm Parent alarm context +** PRIntervalTime period Interval over which the notifies +** are delivered. +** PRUint32 rate The rate within the interval that +** the notifies will be delivered. +** PRPeriodicAlarmFn function Entry point where the notifies +** will be delivered. +** OUTPUTS: None +** RETURN: PRAlarmID* Handle to the notifier just created +** or NULL if the request failed. +** +** SIDE EFFECTS: +** A periodic notifier is created. The notifications will be delivered +** by the alarm's internal thread at a fixed interval whose rate is the +** number of interrupts per interval specified. The first notification +** will be delivered as soon as possible, and they will continue until +** the notifier routine indicates that they should cease of the alarm +** context is destroyed (PR_DestroyAlarm). +** RESTRICTIONS: +** None. +** MEMORY: Memory for the notifier object. +** ALGORITHM: The rate at which notifications are delivered are stated +** to be "'rate' notifies per 'interval'". The exact time of +** the notification is computed based on a epoch established +** when the notifier was set. Each notification is delivered +** not ealier than the epoch plus the fixed rate times the +** notification sequence number. Such notifications have the +** potential to be late by not more than 'interval'/'rate'. +** The amount of lateness of one notification is taken into +** account on the next in an attempt to avoid long term slew. +***********************************************************************/ +NSPR_API(PRAlarmID*) PR_SetAlarm( + PRAlarm *alarm, PRIntervalTime period, PRUint32 rate, + PRPeriodicAlarmFn function, void *clientData); + +/*********************************************************************** +** FUNCTION: PR_ResetAlarm +** DESCRIPTION: +** Resets an existing alarm. +** INPUTS: PRAlarmID *id Identify of the notifier. +** PRIntervalTime period Interval over which the notifies +** are delivered. +** PRUint32 rate The rate within the interval that +** the notifies will be delivered. +** OUTPUTS: None +** RETURN: PRStatus Indication of completion. +** +** SIDE EFFECTS: +** An existing alarm may have its period and rate redefined. The +** additional side effect is that the notifier's epoch is recomputed. +** The first notification delivered by the newly refreshed alarm is +** defined to be 'interval'/'rate' from the time of the reset. +** RESTRICTIONS: +** This function may only be called in the notifier for that alarm. +** MEMORY: N/A. +** ALGORITHM: See PR_SetAlarm(). +***********************************************************************/ +NSPR_API(PRStatus) PR_ResetAlarm( + PRAlarmID *id, PRIntervalTime period, PRUint32 rate); + +PR_END_EXTERN_C + +#endif /* !defined(pralarm_h) */ + +/* prinrval.h */ |