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Add *NSYNC unit test suite

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This change also fixes the clock_nanosleep() api and polyfills futexes
on Windows, Mac, and NetBSD using exponential backoff.
This commit is contained in:
Justine Tunney 2022-10-07 21:29:40 -07:00
parent 3421b9a580
commit 9849b4c7ba
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51 changed files with 5505 additions and 1060 deletions
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third_party/nsync/testing/once_test.c vendored Normal file
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/*-*- mode:c;indent-tabs-mode:t;c-basic-offset:8;tab-width:8;coding:utf-8 -*-│
│vi: set et ft=c ts=8 tw=8 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2016 Google Inc. │
│ │
│ Licensed under the Apache License, Version 2.0 (the "License"); │
│ you may not use this file except in compliance with the License. │
│ You may obtain a copy of the License at │
│ │
│ http://www.apache.org/licenses/LICENSE-2.0 │
│ │
│ Unless required by applicable law or agreed to in writing, software │
│ distributed under the License is distributed on an "AS IS" BASIS, │
│ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. │
│ See the License for the specific language governing permissions and │
│ limitations under the License. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/str/str.h"
#include "libc/thread/thread.h"
#include "third_party/nsync/counter.h"
#include "third_party/nsync/mu.h"
#include "third_party/nsync/once.h"
#include "third_party/nsync/testing/closure.h"
#include "third_party/nsync/testing/smprintf.h"
#include "third_party/nsync/testing/testing.h"
// clang-format off
/* This tests nsync_once */
/* Data structure for each test of nsync_once */
struct once_test_s {
nsync_once once; /* the nsync_once under test */
int counter; /* a counter that should be incremented once */
nsync_counter done; /* reaches 0 when all threads done */
testing t; /* the test handle */
};
/* Per-thread data structure */
struct once_test_thread_s {
int id; /* thread id */
struct once_test_s *s; /* the per-test structure */
};
#define N 4 /* number of threads used per test */
static struct once_test_thread_s ott[N]; /* data structure per thread */
static nsync_mu ott_s_mu = NSYNC_MU_INIT;
/* Increment s->counter by a power of two chosen by the thread id. Called
via one of the nsync_run_once* calls. */
static void once_arg_func (void *v) {
struct once_test_thread_s *lott = (struct once_test_thread_s *) v;
struct once_test_s *s;
nsync_mu_lock (&ott_s_mu);
s = lott->s;
nsync_mu_unlock (&ott_s_mu);
if (s->counter != 0) {
TEST_ERROR (s->t, ("once_arg_func found counter!=0"));
}
s->counter += 1 << (2 * lott->id);
}
/* Call once_arg_func() on the first thread structure. */
static void once_func0 (void) {
once_arg_func (&ott[0]);
}
/* Call once_arg_func() on the second thread structure. */
static void once_func1 (void) {
once_arg_func (&ott[1]);
}
/* Pause for a short time, then use one of the nsync_run_once* calls on
ott->s->once, chosen using the thread id. This is the body of each test
thread. */
static void once_thread (struct once_test_thread_s *lott) {
struct once_test_s *s;
nsync_mu_lock (&ott_s_mu);
s = lott->s;
nsync_mu_unlock (&ott_s_mu);
nsync_time_sleep (nsync_time_s_ns (0, 1 * 1000 * 1000));
switch (lott->id & 3) {
case 0: nsync_run_once (&s->once, &once_func0); break;
case 1: nsync_run_once_spin (&s->once, &once_func1); break;
case 2: nsync_run_once_arg (&s->once, &once_arg_func, lott); break;
case 3: nsync_run_once_arg_spin (&s->once, &once_arg_func, lott); break;
}
nsync_counter_add (s->done, -1);
}
CLOSURE_DECL_BODY1 (once_thread, struct once_test_thread_s *)
/* Test the functionality of nsync_once */
static void test_once_run (testing t) {
int i;
int j;
for (j = 0; j != N; j++) {
ott[j].id = j;
}
for (i = 0; i != 250; i++) {
struct once_test_s *s =
(struct once_test_s *) malloc (sizeof (*s));
memset ((void *) s, 0, sizeof (*s));
s->counter = 0;
s->done = nsync_counter_new (N);
s->t = t;
for (j = 0; j != N; j++) {
nsync_mu_lock (&ott_s_mu);
ott[j].s = s;
nsync_mu_unlock (&ott_s_mu);
}
for (j = 0; j != N; j++) {
closure_fork (closure_once_thread (&once_thread,
&ott[j]));
}
if (nsync_counter_wait (s->done,
nsync_time_no_deadline) != 0) {
TEST_ERROR (t, ("s.done not decremented to 0"));
}
if (s->counter == 0) {
TEST_ERROR (t, ("s.counter wasn't incremented"));
}
/* The counter is expected to be a power of two, because each
counter is incremented only via a single nsync_once (so at
most one increment should occur) and always by a power of
two. */
if ((s->counter & (s->counter-1)) != 0) {
TEST_ERROR (t, ("s.counter incremented repeatedly: %x",
s->counter));
}
nsync_counter_free (s->done);
free (s);
}
}
/* Do nothing. */
static void no_op (void) {
}
/* Measure the performance of repeated use of nsync_run_once. */
static void benchmark_nsync_once (testing t) {
static nsync_once o = NSYNC_ONCE_INIT;
int n = testing_n (t);
int i;
for (i = 0; i != n; i++) {
nsync_run_once (&o, &no_op);
}
}
/* Measure the performance of repeated use of pthread_once. */
static void benchmark_native_once (testing t) {
static pthread_once_t o = PTHREAD_ONCE_INIT;
int n = testing_n (t);
int i;
for (i = 0; i != n; i++) {
pthread_once (&o, &no_op);
}
}
int main (int argc, char *argv[]) {
testing_base tb = testing_new (argc, argv, 0);
TEST_RUN (tb, test_once_run);
BENCHMARK_RUN (tb, benchmark_nsync_once);
BENCHMARK_RUN (tb, benchmark_native_once);
return (testing_base_exit (tb));
}