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106 lines
3.1 KiB
C
106 lines
3.1 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2020 Kyle Evans <kevans@FreeBSD.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/types.h>
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#include <sys/umtx.h>
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#include <pthread.h>
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#include <atf-c.h>
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/*
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* This is an implementation detail of _umtx_op(2), pulled from
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* sys/kern/kern_umtx.c. The relevant bug observed that requests above the
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* batch size would not function as intended, so it's important that this
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* reflects the BATCH_SIZE configured there.
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*/
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#define UMTX_OP_BATCH_SIZE 128
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#define THREAD_COUNT ((UMTX_OP_BATCH_SIZE * 3) / 2)
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static pthread_mutex_t static_mutex = PTHREAD_MUTEX_INITIALIZER;
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static int batched_waiting;
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static void *
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batching_threadfunc(void *arg)
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{
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pthread_mutex_lock(&static_mutex);
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++batched_waiting;
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pthread_mutex_unlock(&static_mutex);
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_umtx_op(arg, UMTX_OP_WAIT_UINT_PRIVATE, 0, NULL, NULL);
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return (NULL);
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}
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ATF_TC(batching);
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ATF_TC_HEAD(batching, tc)
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{
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atf_tc_set_md_var(tc, "descr",
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"Checks batching of UMTX_OP_NWAKE_PRIVATE");
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}
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ATF_TC_BODY(batching, tc)
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{
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uintptr_t addrs[THREAD_COUNT];
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uint32_t vals[THREAD_COUNT];
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pthread_t threads[THREAD_COUNT];
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for (int i = 0; i < THREAD_COUNT; i++) {
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addrs[i] = (uintptr_t)&vals[i];
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vals[i] = 0;
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pthread_create(&threads[i], NULL, batching_threadfunc,
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&vals[i]);
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}
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pthread_mutex_lock(&static_mutex);
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while (batched_waiting != THREAD_COUNT) {
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pthread_mutex_unlock(&static_mutex);
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pthread_yield();
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pthread_mutex_lock(&static_mutex);
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}
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/*
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* Spin for another .50 seconds to make sure they're all safely in the
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* kernel.
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*/
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usleep(500000);
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pthread_mutex_unlock(&static_mutex);
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_umtx_op(addrs, UMTX_OP_NWAKE_PRIVATE, THREAD_COUNT, NULL, NULL);
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for (int i = 0; i < THREAD_COUNT; i++) {
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ATF_REQUIRE_EQ(0, pthread_join(threads[i], NULL));
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}
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}
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ATF_TP_ADD_TCS(tp)
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{
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ATF_TP_ADD_TC(tp, batching);
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return (atf_no_error());
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}
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