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https://gitlab.isc.org/isc-projects/bind9
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8dfdb95a20
Some POSIX threads implementations (e.g. FreeBSD's libthr) allocate memory on the heap when pthread_cond_init() is called. Every call to that function must be accompanied by a corresponding call to pthread_cond_destroy() or else the memory allocated for the condition variable will leak. jemalloc can be used for detecting memory allocations which are not released by a process when it exits. Unfortunately, since jemalloc is also the system allocator on FreeBSD and a special (profiling-enabled) build of jemalloc is required for memory leak detection, this method cannot be used for detecting leaked memory allocated by libthr on a stock FreeBSD installation. However, libthr's behavior can be emulated on any platform by implementing alternative versions of libisc functions for creating and destroying condition variables that allocate memory using malloc() and release it using free(). This enables using jemalloc for detecting missing pthread_cond_destroy() calls on any platform on which it works reliably. When the newly introduced ISC_TRACK_PTHREADS_OBJECTS preprocessor macro is set, allocate isc_condition_t structures on the heap in isc_condition_init() and free them in isc_condition_destroy(). Reuse existing condition variable macros (after renaming them appropriately) for other operations.
69 lines
1.7 KiB
C
69 lines
1.7 KiB
C
/*
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* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
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*
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* SPDX-License-Identifier: MPL-2.0
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, you can obtain one at https://mozilla.org/MPL/2.0/.
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*
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* See the COPYRIGHT file distributed with this work for additional
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* information regarding copyright ownership.
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*/
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/*! \file */
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#include <errno.h>
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#include <isc/condition.h>
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#include <isc/strerr.h>
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#include <isc/string.h>
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#include <isc/time.h>
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#include <isc/util.h>
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isc_result_t
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isc__condition_waituntil(pthread_cond_t *c, pthread_mutex_t *m, isc_time_t *t) {
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int presult;
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isc_result_t result;
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struct timespec ts;
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char strbuf[ISC_STRERRORSIZE];
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REQUIRE(c != NULL && m != NULL && t != NULL);
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/*
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* POSIX defines a timespec's tv_sec as time_t.
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*/
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result = isc_time_secondsastimet(t, &ts.tv_sec);
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/*
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* If we have a range error ts.tv_sec is most probably a signed
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* 32 bit value. Set ts.tv_sec to INT_MAX. This is a kludge.
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*/
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if (result == ISC_R_RANGE) {
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ts.tv_sec = INT_MAX;
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} else if (result != ISC_R_SUCCESS) {
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return (result);
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}
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/*!
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* POSIX defines a timespec's tv_nsec as long. isc_time_nanoseconds
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* ensures its return value is < 1 billion, which will fit in a long.
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*/
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ts.tv_nsec = (long)isc_time_nanoseconds(t);
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do {
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presult = pthread_cond_timedwait(c, m, &ts);
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if (presult == 0) {
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return (ISC_R_SUCCESS);
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}
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if (presult == ETIMEDOUT) {
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return (ISC_R_TIMEDOUT);
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}
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} while (presult == EINTR);
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strerror_r(presult, strbuf, sizeof(strbuf));
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UNEXPECTED_ERROR(__FILE__, __LINE__,
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"pthread_cond_timedwait() returned %s", strbuf);
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return (ISC_R_UNEXPECTED);
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}
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