112 lines
2.4 KiB
C
112 lines
2.4 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 processes on a mutex, then wake them up.
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*/
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#include <sys/types.h>
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#include <sys/wait.h>
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#include "futextest.h"
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#include "futex_utils.h"
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static futex_t *futex;
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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 void do_child(void)
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{
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struct futex_test_variants *tv = &variants[tst_variant];
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futex_wait(tv->fntype, futex, *futex, NULL, 0);
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exit(0);
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}
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static void do_wake(int nr_children)
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{
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struct futex_test_variants *tv = &variants[tst_variant];
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int res, i, cnt;
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TEST(futex_wake(tv->fntype, futex, nr_children, 0));
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if (TST_RET != nr_children) {
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tst_res(TFAIL | TTERRNO,
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"futex_wake() woken up %li children, expected %i",
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TST_RET, nr_children);
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return;
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}
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for (cnt = 0, i = 0; i < 100000; i++) {
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while (waitpid(-1, &res, WNOHANG) > 0)
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cnt++;
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if (cnt == nr_children)
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break;
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usleep(100);
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}
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if (cnt != nr_children) {
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tst_res(TFAIL, "reaped only %i childs, expected %i",
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cnt, nr_children);
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} else {
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tst_res(TPASS, "futex_wake() woken up %i childs", cnt);
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}
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}
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static void run(void)
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{
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struct futex_test_variants *tv = &variants[tst_variant];
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pid_t pids[55];
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unsigned int i;
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for (i = 0; i < ARRAY_SIZE(pids); i++) {
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pids[i] = SAFE_FORK();
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if (!pids[i])
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do_child();
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}
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for (i = 0; i < ARRAY_SIZE(pids); i++)
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TST_PROCESS_STATE_WAIT(pids[i], 'S', 0);
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for (i = 1; i <= 10; i++)
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do_wake(i);
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TEST(futex_wake(tv->fntype, futex, 1, 0));
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if (TST_RET) {
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tst_res(TFAIL | TTERRNO,
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"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 children");
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}
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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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futex = SAFE_MMAP(NULL, sizeof(*futex), PROT_READ | PROT_WRITE,
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MAP_ANONYMOUS | MAP_SHARED, -1, 0);
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*futex = FUTEX_INITIALIZER;
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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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