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/*
* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
*
* 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/.
*
* See the COPYRIGHT file distributed with this work for additional
* information regarding copyright ownership.
*/
#ifndef ISC_UTIL_H
#define ISC_UTIL_H 1
/*! \file isc/util.h
* NOTE:
*
* This file is not to be included from any <isc/???.h> (or other) library
* files.
*
* \brief
* Including this file puts several macros in your name space that are
* not protected (as all the other ISC functions/macros do) by prepending
* ISC_ or isc_ to the name.
*/
/***
*** General Macros.
***/
/*%
* Use this to hide unused function arguments.
* \code
* int
* foo(char *bar)
* {
* UNUSED(bar);
* }
* \endcode
*/
#define UNUSED(x) (void)(x)
/*%
* The opposite: silent warnings about stored values which are never read.
*/
#define POST(x) (void)(x)
#define ISC_MAX(a, b) ((a) > (b) ? (a) : (b))
#define ISC_MIN(a, b) ((a) < (b) ? (a) : (b))
#define ISC_CLAMP(v, x, y) ((v) < (x) ? (x) : ((v) > (y) ? (y) : (v)))
/*%
* Use this to remove the const qualifier of a variable to assign it to
* a non-const variable or pass it as a non-const function argument ...
* but only when you are sure it won't then be changed!
* This is necessary to sometimes shut up some compilers
* (as with gcc -Wcast-qual) when there is just no other good way to avoid the
* situation.
*/
#define DE_CONST(konst, var) \
do { \
union { const void *k; void *v; } _u; \
_u.k = konst; \
var = _u.v; \
} while (0)
/*%
* Use this in translation units that would otherwise be empty, to
* suppress compiler warnings.
*/
#define EMPTY_TRANSLATION_UNIT static void isc__empty(void) { isc__empty(); }
/*%
* We use macros instead of calling the routines directly because
* the capital letters make the locking stand out.
* We RUNTIME_CHECK for success since in general there's no way
* for us to continue if they fail.
*/
#ifdef ISC_UTIL_TRACEON
#define ISC_UTIL_TRACE(a) a
#include <stdio.h> /* Required for fprintf/stderr when tracing. */
#include <isc/msgs.h> /* Required for isc_msgcat when tracing. */
#else
#define ISC_UTIL_TRACE(a)
#endif
#include <isc/result.h> /* Contractual promise. */
#define LOCK(lp) do { \
ISC_UTIL_TRACE(fprintf(stderr, "%s %p %s %d\n", \
isc_msgcat_get(isc_msgcat, ISC_MSGSET_UTIL, \
ISC_MSG_LOCKING, "LOCKING"), \
(lp), __FILE__, __LINE__)); \
RUNTIME_CHECK(isc_mutex_lock((lp)) == ISC_R_SUCCESS); \
ISC_UTIL_TRACE(fprintf(stderr, "%s %p %s %d\n", \
isc_msgcat_get(isc_msgcat, ISC_MSGSET_UTIL, \
ISC_MSG_LOCKED, "LOCKED"), \
(lp), __FILE__, __LINE__)); \
} while (0)
#define UNLOCK(lp) do { \
RUNTIME_CHECK(isc_mutex_unlock((lp)) == ISC_R_SUCCESS); \
ISC_UTIL_TRACE(fprintf(stderr, "%s %p %s %d\n", \
isc_msgcat_get(isc_msgcat, ISC_MSGSET_UTIL, \
ISC_MSG_UNLOCKED, "UNLOCKED"), \
(lp), __FILE__, __LINE__)); \
} while (0)
#define ISLOCKED(lp) (1)
#define DESTROYLOCK(lp) \
RUNTIME_CHECK(isc_mutex_destroy((lp)) == ISC_R_SUCCESS)
#define BROADCAST(cvp) do { \
ISC_UTIL_TRACE(fprintf(stderr, "%s %p %s %d\n", \
isc_msgcat_get(isc_msgcat, ISC_MSGSET_UTIL, \
ISC_MSG_BROADCAST, "BROADCAST"),\
(cvp), __FILE__, __LINE__)); \
RUNTIME_CHECK(isc_condition_broadcast((cvp)) == ISC_R_SUCCESS); \
} while (0)
#define SIGNAL(cvp) do { \
ISC_UTIL_TRACE(fprintf(stderr, "%s %p %s %d\n", \
isc_msgcat_get(isc_msgcat, ISC_MSGSET_UTIL, \
ISC_MSG_SIGNAL, "SIGNAL"), \
(cvp), __FILE__, __LINE__)); \
RUNTIME_CHECK(isc_condition_signal((cvp)) == ISC_R_SUCCESS); \
} while (0)
#define WAIT(cvp, lp) do { \
ISC_UTIL_TRACE(fprintf(stderr, "%s %p %s %p %s %d\n", \
isc_msgcat_get(isc_msgcat, ISC_MSGSET_UTIL, \
ISC_MSG_UTILWAIT, "WAIT"), \
(cvp), \
isc_msgcat_get(isc_msgcat, ISC_MSGSET_UTIL, \
ISC_MSG_LOCK, "LOCK"), \
(lp), __FILE__, __LINE__)); \
RUNTIME_CHECK(isc_condition_wait((cvp), (lp)) == ISC_R_SUCCESS); \
ISC_UTIL_TRACE(fprintf(stderr, "%s %p %s %p %s %d\n", \
isc_msgcat_get(isc_msgcat, ISC_MSGSET_UTIL, \
ISC_MSG_WAITED, "WAITED"), \
(cvp), \
isc_msgcat_get(isc_msgcat, ISC_MSGSET_UTIL, \
ISC_MSG_LOCKED, "LOCKED"), \
(lp), __FILE__, __LINE__)); \
} while (0)
/*
* isc_condition_waituntil can return ISC_R_TIMEDOUT, so we
* don't RUNTIME_CHECK the result.
*
* XXX Also, can't really debug this then...
*/
#define WAITUNTIL(cvp, lp, tp) \
isc_condition_waituntil((cvp), (lp), (tp))
#define RWLOCK(lp, t) do { \
ISC_UTIL_TRACE(fprintf(stderr, "%s %p, %d %s %d\n", \
isc_msgcat_get(isc_msgcat, ISC_MSGSET_UTIL, \
ISC_MSG_RWLOCK, "RWLOCK"), \
(lp), (t), __FILE__, __LINE__)); \
RUNTIME_CHECK(isc_rwlock_lock((lp), (t)) == ISC_R_SUCCESS); \
ISC_UTIL_TRACE(fprintf(stderr, "%s %p, %d %s %d\n", \
isc_msgcat_get(isc_msgcat, ISC_MSGSET_UTIL, \
ISC_MSG_RWLOCKED, "RWLOCKED"), \
(lp), (t), __FILE__, __LINE__)); \
} while (0)
#define RWUNLOCK(lp, t) do { \
ISC_UTIL_TRACE(fprintf(stderr, "%s %p, %d %s %d\n", \
isc_msgcat_get(isc_msgcat, ISC_MSGSET_UTIL, \
ISC_MSG_RWUNLOCK, "RWUNLOCK"), \
(lp), (t), __FILE__, __LINE__)); \
RUNTIME_CHECK(isc_rwlock_unlock((lp), (t)) == ISC_R_SUCCESS); \
} while (0)
#define DESTROYMUTEXBLOCK(bp, n) \
RUNTIME_CHECK(isc_mutexblock_destroy((bp), (n)) == ISC_R_SUCCESS)
/*
* List Macros.
*/
#include <isc/list.h> /* Contractual promise. */
#define LIST(type) ISC_LIST(type)
#define INIT_LIST(type) ISC_LIST_INIT(type)
#define LINK(type) ISC_LINK(type)
#define INIT_LINK(elt, link) ISC_LINK_INIT(elt, link)
#define HEAD(list) ISC_LIST_HEAD(list)
#define TAIL(list) ISC_LIST_TAIL(list)
#define EMPTY(list) ISC_LIST_EMPTY(list)
#define PREV(elt, link) ISC_LIST_PREV(elt, link)
#define NEXT(elt, link) ISC_LIST_NEXT(elt, link)
#define APPEND(list, elt, link) ISC_LIST_APPEND(list, elt, link)
#define PREPEND(list, elt, link) ISC_LIST_PREPEND(list, elt, link)
#define UNLINK(list, elt, link) ISC_LIST_UNLINK(list, elt, link)
#define ENQUEUE(list, elt, link) ISC_LIST_APPEND(list, elt, link)
#define DEQUEUE(list, elt, link) ISC_LIST_UNLINK(list, elt, link)
#define INSERTBEFORE(li, b, e, ln) ISC_LIST_INSERTBEFORE(li, b, e, ln)
#define INSERTAFTER(li, a, e, ln) ISC_LIST_INSERTAFTER(li, a, e, ln)
#define APPENDLIST(list1, list2, link) ISC_LIST_APPENDLIST(list1, list2, link)
/*%
* Performance
*/
#include <isc/likely.h>
/*
* Assertions
*/
#include <isc/assertions.h> /* Contractual promise. */
/*% Require Assertion */
#define REQUIRE(e) ISC_REQUIRE(e)
/*% Ensure Assertion */
#define ENSURE(e) ISC_ENSURE(e)
/*% Insist Assertion */
#define INSIST(e) ISC_INSIST(e)
/*% Invariant Assertion */
#define INVARIANT(e) ISC_INVARIANT(e)
/*
* Errors
*/
#include <isc/error.h> /* Contractual promise. */
/*% Unexpected Error */
#define UNEXPECTED_ERROR isc_error_unexpected
/*% Fatal Error */
#define FATAL_ERROR isc_error_fatal
/*% Runtime Check */
#define RUNTIME_CHECK(cond) ISC_ERROR_RUNTIMECHECK(cond)
/*%
* Time
*/
#define TIME_NOW(tp) RUNTIME_CHECK(isc_time_now((tp)) == ISC_R_SUCCESS)
#ifdef CLOCK_BOOTTIME
#define TIME_MONOTONIC(tp) RUNTIME_CHECK(isc_time_boottime((tp)) == ISC_R_SUCCESS)
#endif
/*%
* Misc
*/
#include <isc/deprecated.h>
#endif /* ISC_UTIL_H */