213 lines
5.3 KiB
C
213 lines
5.3 KiB
C
/*
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* Copyright (C) 1999-2001 Internet Software Consortium.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM
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* DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
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* INTERNET SOFTWARE CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT,
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* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
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* FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
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* NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
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* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/* $Id: app.h,v 1.1 2001/07/06 19:50:03 gson Exp $ */
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#ifndef ISC_APP_H
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#define ISC_APP_H 1
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/*****
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***** Module Info
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*****/
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/*
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* ISC Application Support
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*
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* Dealing with program termination can be difficult, especially in a
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* multithreaded program. The routines in this module help coordinate
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* the shutdown process. They are used as follows by the initial (main)
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* thread of the application:
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*
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* isc_app_start(); Call very early in main(), before
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* any other threads have been created.
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*
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* isc_app_run(); This will post any on-run events,
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* and then block until application
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* shutdown is requested. A shutdown
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* request is made by calling
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* isc_app_shutdown(), or by sending
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* SIGINT or SIGTERM to the process.
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* After isc_app_run() returns, the
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* application should shutdown itself.
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*
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* isc_app_finish(); Call very late in main().
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*
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* Applications that want to use SIGHUP/isc_app_reload() to trigger reloading
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* should check the result of isc_app_run() and call the reload routine if
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* the result is ISC_R_RELOAD. They should then call isc_app_run() again
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* to resume waiting for reload or termination.
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*
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* Use of this module is not required. In particular, isc_app_start() is
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* NOT an ISC library initialization routine.
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*
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* MP:
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* Clients must ensure that isc_app_start(), isc_app_run(), and
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* isc_app_finish() are called at most once. isc_app_shutdown()
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* is safe to use by any thread (provided isc_app_start() has been
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* called previously).
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*
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* Reliability:
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* No anticipated impact.
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*
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* Resources:
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* None.
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*
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* Security:
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* No anticipated impact.
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*
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* Standards:
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* None.
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*/
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#include <isc/eventclass.h>
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#include <isc/lang.h>
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#include <isc/result.h>
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typedef isc_event_t isc_appevent_t;
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#define ISC_APPEVENT_FIRSTEVENT (ISC_EVENTCLASS_APP + 0)
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#define ISC_APPEVENT_SHUTDOWN (ISC_EVENTCLASS_APP + 1)
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#define ISC_APPEVENT_LASTEVENT (ISC_EVENTCLASS_APP + 65535)
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ISC_LANG_BEGINDECLS
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isc_result_t
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isc_app_start(void);
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/*
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* Start an ISC library application.
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*
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* Notes:
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* This call should be made before any other ISC library call, and as
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* close to the beginning of the application as possible.
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*/
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isc_result_t
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isc_app_onrun(isc_mem_t *mctx, isc_task_t *task, isc_taskaction_t action,
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void *arg);
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/*
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* Request delivery of an event when the application is run.
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*
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* Requires:
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* isc_app_start() has been called.
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*
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* Returns:
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* ISC_R_SUCCESS
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* ISC_R_NOMEMORY
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*/
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isc_result_t
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isc_app_run(void);
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/*
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* Run an ISC library application.
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*
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* Notes:
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* The caller (typically the initial thread of an application) will
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* block until shutdown is requested. When the call returns, the
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* caller should start shutting down the application.
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*
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* Requires:
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* isc_app_start() has been called.
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*
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* Ensures:
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* Any events requested via isc_app_onrun() will have been posted (in
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* FIFO order) before isc_app_run() blocks.
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*
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* Returns:
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* ISC_R_SUCCESS Shutdown has been requested.
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* ISC_R_RELOAD Reload has been requested.
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*/
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isc_result_t
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isc_app_shutdown(void);
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/*
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* Request application shutdown.
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*
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* Notes:
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* It is safe to call isc_app_shutdown() multiple times. Shutdown will
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* only be triggered once.
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*
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* Requires:
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* isc_app_run() has been called.
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*
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* Returns:
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* ISC_R_SUCCESS
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* ISC_R_UNEXPECTED
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*/
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isc_result_t
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isc_app_reload(void);
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/*
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* Request application reload.
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*
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* Requires:
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* isc_app_run() has been called.
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*
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* Returns:
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* ISC_R_SUCCESS
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* ISC_R_UNEXPECTED
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*/
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void
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isc_app_finish(void);
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/*
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* Finish an ISC library application.
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*
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* Notes:
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* This call should be made at or near the end of main().
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*
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* Requires:
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* isc_app_start() has been called.
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*
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* Ensures:
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* Any resources allocated by isc_app_start() have been released.
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*/
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void
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isc_app_block(void);
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/*
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* Indicate that a blocking operation will be performed.
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*
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* Notes:
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* If a blocking operation is in process, a call to isc_app_shutdown()
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* or an external signal will abort the program, rather than allowing
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* clean shutdown. This is primarily useful for reading user input.
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*
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* Requires:
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* isc_app_start() has been called.
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* No other blocking operations are in progress.
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*/
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void
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isc_app_unblock(void);
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/*
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* Indicate that a blocking operation is complete.
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*
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* Notes:
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* When a blocking operation has completed, return the program to a
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* state where a call to isc_app_shutdown() or an external signal will
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* shutdown normally.
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*
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* Requires:
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* isc_app_start() has been called.
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* isc_app_block() has been called by the same thread.
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*/
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ISC_LANG_ENDDECLS
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#endif /* ISC_APP_H */
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