144 lines
3.3 KiB
C
144 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2015 Cyril Hrubis <chrubis@suse.cz>
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*
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* Block several threads on a private mutex, then wake them up.
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*/
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#include <sys/types.h>
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#include "futextest.h"
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#include "futex_utils.h"
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#include "tst_safe_pthread.h"
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static futex_t futex = FUTEX_INITIALIZER;
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static volatile int threads_flags[55];
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static struct futex_test_variants variants[] = {
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#if (__NR_futex != __LTP__NR_INVALID_SYSCALL)
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{ .fntype = FUTEX_FN_FUTEX, .desc = "syscall with old kernel spec"},
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#endif
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#if (__NR_futex_time64 != __LTP__NR_INVALID_SYSCALL)
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{ .fntype = FUTEX_FN_FUTEX64, .desc = "syscall time64 with kernel spec"},
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#endif
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};
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static int threads_awake(void)
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{
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int ret = 0;
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unsigned int i;
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for (i = 0; i < ARRAY_SIZE(threads_flags); i++) {
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if (threads_flags[i])
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ret++;
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}
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return ret;
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}
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static void clear_threads_awake(void)
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{
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unsigned int i;
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for (i = 0; i < ARRAY_SIZE(threads_flags); i++)
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threads_flags[i] = 0;
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}
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static void *threaded(void *arg)
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{
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struct futex_test_variants *tv = &variants[tst_variant];
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long i = (long)arg;
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futex_wait(tv->fntype, &futex, futex, NULL, FUTEX_PRIVATE_FLAG);
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threads_flags[i] = 1;
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return NULL;
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}
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static void do_child(void)
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{
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struct futex_test_variants *tv = &variants[tst_variant];
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int i, j, awake;
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pthread_t t[55];
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for (i = 0; i < (int)ARRAY_SIZE(t); i++)
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SAFE_PTHREAD_CREATE(&t[i], NULL, threaded, (void*)((long)i));
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while (wait_for_threads(ARRAY_SIZE(t)))
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usleep(100);
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for (i = 1; i <= 10; i++) {
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clear_threads_awake();
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TEST(futex_wake(tv->fntype, &futex, i, FUTEX_PRIVATE_FLAG));
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if (i != TST_RET) {
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tst_res(TFAIL | TTERRNO,
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"futex_wake() woken up %li threads, expected %i",
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TST_RET, i);
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}
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for (j = 0; j < 100000; j++) {
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awake = threads_awake();
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if (awake == i)
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break;
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usleep(100);
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}
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if (awake == i) {
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tst_res(TPASS, "futex_wake() woken up %i threads", i);
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} else {
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tst_res(TFAIL, "Woken up %i threads, expected %i",
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awake, i);
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}
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}
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TEST(futex_wake(tv->fntype, &futex, 1, FUTEX_PRIVATE_FLAG));
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if (TST_RET) {
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tst_res(TFAIL | TTERRNO, "futex_wake() woken up %li, none were waiting",
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TST_RET);
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} else {
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tst_res(TPASS, "futex_wake() woken up 0 threads");
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}
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for (i = 0; i < (int)ARRAY_SIZE(t); i++)
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SAFE_PTHREAD_JOIN(t[i], NULL);
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exit(0);
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}
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/*
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* We do the real test in a child because with the test -i parameter the loop
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* that checks that all threads are sleeping may fail with ENOENT. That is
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* because some of the threads from previous run may still be there.
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*
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* Which is because the userspace part of pthread_join() sleeps in a futex on a
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* pthread tid which is woken up at the end of the exit_mm(tsk) which is before
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* the process is removed from the parent thread_group list. So there is a
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* small race window where the readdir() returns the process tid as a directory
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* under /proc/$PID/tasks/, but the subsequent open() fails with ENOENT because
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* the thread was removed meanwhile.
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*/
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static void run(void)
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{
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if (!SAFE_FORK())
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do_child();
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}
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static void setup(void)
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{
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struct futex_test_variants *tv = &variants[tst_variant];
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tst_res(TINFO, "Testing variant: %s", tv->desc);
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futex_supported_by_kernel(tv->fntype);
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}
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static struct tst_test test = {
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.setup = setup,
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.test_all = run,
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.test_variants = ARRAY_SIZE(variants),
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.forks_child = 1,
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};
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