1/*	$NetBSD: condition.c,v 1.1 2024/02/18 20:57:56 christos Exp $	*/
2
3/*
4 * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
5 *
6 * SPDX-License-Identifier: MPL-2.0
7 *
8 * This Source Code Form is subject to the terms of the Mozilla Public
9 * License, v. 2.0. If a copy of the MPL was not distributed with this
10 * file, you can obtain one at https://mozilla.org/MPL/2.0/.
11 *
12 * See the COPYRIGHT file distributed with this work for additional
13 * information regarding copyright ownership.
14 */
15
16/*! \file */
17
18#include <errno.h>
19
20#include <isc/condition.h>
21#include <isc/strerr.h>
22#include <isc/string.h>
23#include <isc/time.h>
24#include <isc/util.h>
25
26isc_result_t
27isc_condition_waituntil(isc_condition_t *c, isc_mutex_t *m, isc_time_t *t) {
28	int presult;
29	isc_result_t result;
30	struct timespec ts;
31	char strbuf[ISC_STRERRORSIZE];
32
33	REQUIRE(c != NULL && m != NULL && t != NULL);
34
35	/*
36	 * POSIX defines a timespec's tv_sec as time_t.
37	 */
38	result = isc_time_secondsastimet(t, &ts.tv_sec);
39
40	/*
41	 * If we have a range error ts.tv_sec is most probably a signed
42	 * 32 bit value.  Set ts.tv_sec to INT_MAX.  This is a kludge.
43	 */
44	if (result == ISC_R_RANGE) {
45		ts.tv_sec = INT_MAX;
46	} else if (result != ISC_R_SUCCESS) {
47		return (result);
48	}
49
50	/*!
51	 * POSIX defines a timespec's tv_nsec as long.  isc_time_nanoseconds
52	 * ensures its return value is < 1 billion, which will fit in a long.
53	 */
54	ts.tv_nsec = (long)isc_time_nanoseconds(t);
55
56	do {
57#if ISC_MUTEX_PROFILE
58		presult = pthread_cond_timedwait(c, &m->mutex, &ts);
59#else  /* if ISC_MUTEX_PROFILE */
60		presult = pthread_cond_timedwait(c, m, &ts);
61#endif /* if ISC_MUTEX_PROFILE */
62		if (presult == 0) {
63			return (ISC_R_SUCCESS);
64		}
65		if (presult == ETIMEDOUT) {
66			return (ISC_R_TIMEDOUT);
67		}
68	} while (presult == EINTR);
69
70	strerror_r(presult, strbuf, sizeof(strbuf));
71	UNEXPECTED_ERROR(__FILE__, __LINE__,
72			 "pthread_cond_timedwait() returned %s", strbuf);
73	return (ISC_R_UNEXPECTED);
74}
75