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-rw-r--r--lib/isc/pthreads/condition.c72
1 files changed, 72 insertions, 0 deletions
diff --git a/lib/isc/pthreads/condition.c b/lib/isc/pthreads/condition.c
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+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * SPDX-License-Identifier: MPL-2.0
+ *
+ * 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 https://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+/*! \file */
+
+#include <errno.h>
+
+#include <isc/condition.h>
+#include <isc/strerr.h>
+#include <isc/string.h>
+#include <isc/time.h>
+#include <isc/util.h>
+
+isc_result_t
+isc_condition_waituntil(isc_condition_t *c, isc_mutex_t *m, isc_time_t *t) {
+ int presult;
+ isc_result_t result;
+ struct timespec ts;
+ char strbuf[ISC_STRERRORSIZE];
+
+ REQUIRE(c != NULL && m != NULL && t != NULL);
+
+ /*
+ * POSIX defines a timespec's tv_sec as time_t.
+ */
+ result = isc_time_secondsastimet(t, &ts.tv_sec);
+
+ /*
+ * If we have a range error ts.tv_sec is most probably a signed
+ * 32 bit value. Set ts.tv_sec to INT_MAX. This is a kludge.
+ */
+ if (result == ISC_R_RANGE) {
+ ts.tv_sec = INT_MAX;
+ } else if (result != ISC_R_SUCCESS) {
+ return (result);
+ }
+
+ /*!
+ * POSIX defines a timespec's tv_nsec as long. isc_time_nanoseconds
+ * ensures its return value is < 1 billion, which will fit in a long.
+ */
+ ts.tv_nsec = (long)isc_time_nanoseconds(t);
+
+ do {
+#if ISC_MUTEX_PROFILE
+ presult = pthread_cond_timedwait(c, &m->mutex, &ts);
+#else /* if ISC_MUTEX_PROFILE */
+ presult = pthread_cond_timedwait(c, m, &ts);
+#endif /* if ISC_MUTEX_PROFILE */
+ if (presult == 0) {
+ return (ISC_R_SUCCESS);
+ }
+ if (presult == ETIMEDOUT) {
+ return (ISC_R_TIMEDOUT);
+ }
+ } while (presult == EINTR);
+
+ strerror_r(presult, strbuf, sizeof(strbuf));
+ UNEXPECTED_ERROR(__FILE__, __LINE__,
+ "pthread_cond_timedwait() returned %s", strbuf);
+ return (ISC_R_UNEXPECTED);
+}