// SPDX-License-Identifier: GPL-2.0-or-later /****************************************************************************** * * Copyright FUJITSU LIMITED 2010 * Copyright KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> * * DESCRIPTION * Internally, Futex has two handling mode, anon and file. The private file * mapping is special. At first it behave as file, but after write anything * it behave as anon. This test is intent to test such case. * * AUTHOR * KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> * * HISTORY * 2010-Jan-6: Initial version by KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> * *****************************************************************************/ #include <stdio.h> #include <stdlib.h> #include <syscall.h> #include <unistd.h> #include <errno.h> #include <linux/futex.h> #include <pthread.h> #include <libgen.h> #include <signal.h> #include "futextest.h" #include "../../kselftest_harness.h" #define PAGE_SZ 4096 char pad[PAGE_SZ] = {1}; futex_t val = 1; char pad2[PAGE_SZ] = {1}; #define WAKE_WAIT_US 3000000 struct timespec wait_timeout = { .tv_sec = 5, .tv_nsec = 0}; void *thr_futex_wait(void *arg) { int ret; ksft_print_dbg_msg("futex wait\n"); ret = futex_wait(&val, 1, &wait_timeout, 0); if (ret && errno != EWOULDBLOCK && errno != ETIMEDOUT) ksft_exit_fail_msg("futex error.\n"); if (ret && errno == ETIMEDOUT) ksft_exit_fail_msg("waiter timedout\n"); ksft_print_dbg_msg("futex_wait: ret = %d, errno = %d\n", ret, errno); return NULL; } TEST(wait_private_mapped_file) { pthread_t thr; int res; res = pthread_create(&thr, NULL, thr_futex_wait, NULL); if (res < 0) ksft_exit_fail_msg("pthread_create error\n"); ksft_print_dbg_msg("wait a while\n"); usleep(WAKE_WAIT_US); val = 2; res = futex_wake(&val, 1, 0); ksft_print_dbg_msg("futex_wake %d\n", res); if (res != 1) ksft_exit_fail_msg("FUTEX_WAKE didn't find the waiting thread.\n"); ksft_print_dbg_msg("join\n"); pthread_join(thr, NULL); ksft_test_result_pass("wait_private_mapped_file"); } TEST_HARNESS_MAIN