condition.c revision 1.1 
1/*	$NetBSD: condition.c,v 1.1 2024/02/21 21:54:49 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/string.h>
22#include <isc/time.h>
23#include <isc/util.h>
24
25isc_result_t
26isc_condition_waituntil(isc_condition_t *c, isc_mutex_t *m, isc_time_t *t) {
27	int presult;
28	isc_result_t result;
29	struct timespec ts;
30
31	REQUIRE(c != NULL && m != NULL && t != NULL);
32
33	/*
34	 * POSIX defines a timespec's tv_sec as time_t.
35	 */
36	result = isc_time_secondsastimet(t, &ts.tv_sec);
37
38	/*
39	 * If we have a range error ts.tv_sec is most probably a signed
40	 * 32 bit value.  Set ts.tv_sec to INT_MAX.  This is a kludge.
41	 */
42	if (result == ISC_R_RANGE) {
43		ts.tv_sec = INT_MAX;
44	} else if (result != ISC_R_SUCCESS) {
45		return (result);
46	}
47
48	/*!
49	 * POSIX defines a timespec's tv_nsec as long.  isc_time_nanoseconds
50	 * ensures its return value is < 1 billion, which will fit in a long.
51	 */
52	ts.tv_nsec = (long)isc_time_nanoseconds(t);
53
54	do {
55		presult = pthread_cond_timedwait(c, m, &ts);
56		if (presult == 0) {
57			return (ISC_R_SUCCESS);
58		}
59		if (presult == ETIMEDOUT) {
60			return (ISC_R_TIMEDOUT);
61		}
62	} while (presult == EINTR);
63
64	UNEXPECTED_SYSERROR(presult, "pthread_cond_timedwait()");
65	return (ISC_R_UNEXPECTED);
66}
67