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https://sourceware.org/git/glibc.git
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2313ab153d
Linux added FUTEX_LOCK_PI2 to support clock selection (commit bf22a6976897977b0a3f1aeba6823c959fc4fdae). With the new flag we can now proper support CLOCK_MONOTONIC for pthread_mutex_clocklock with Priority Inheritance. If kernel does not support, EINVAL is returned instead. The difference is the futex operation will be issued and the kernel will advertise the missing support (instead of hard-code error return). Checked on x86_64-linux-gnu and i686-linux-gnu on Linux 5.14, 5.11, and 4.15.
159 lines
4.2 KiB
C
159 lines
4.2 KiB
C
/* Copyright (C) 2003-2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <pthread.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/mman.h>
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#include <sys/time.h>
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#include <sys/wait.h>
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#include <support/check.h>
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#include <support/timespec.h>
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#include <support/xunistd.h>
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#include <support/xthread.h>
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#ifdef ENABLE_PP
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#include "tst-tpp.h"
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#endif
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/* A bogus clock value that tells run_test to use pthread_mutex_timedlock
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rather than pthread_mutex_clocklock. */
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#define CLOCK_USE_TIMEDLOCK (-1)
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static void
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do_test_clock (clockid_t clockid, int tmo_result)
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{
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const clockid_t clockid_for_get =
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(clockid == CLOCK_USE_TIMEDLOCK) ? CLOCK_REALTIME : clockid;
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size_t ps = sysconf (_SC_PAGESIZE);
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char tmpfname[] = "/tmp/tst-mutex9.XXXXXX";
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char data[ps];
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void *mem;
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int fd;
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pthread_mutex_t *m;
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pthread_mutexattr_t a;
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pid_t pid;
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fd = mkstemp (tmpfname);
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if (fd == -1)
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FAIL_EXIT1 ("cannot open temporary file: %m\n");
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/* Make sure it is always removed. */
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unlink (tmpfname);
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/* Create one page of data. */
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memset (data, '\0', ps);
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/* Write the data to the file. */
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xwrite (fd, data, ps);
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mem = xmmap (NULL, ps, PROT_READ | PROT_WRITE, MAP_SHARED, fd);
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m = (pthread_mutex_t *) (((uintptr_t) mem + __alignof (pthread_mutex_t))
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& ~(__alignof (pthread_mutex_t) - 1));
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TEST_COMPARE (pthread_mutexattr_init (&a), 0);
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TEST_COMPARE (pthread_mutexattr_setpshared (&a, PTHREAD_PROCESS_SHARED), 0);
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TEST_COMPARE (pthread_mutexattr_settype (&a, PTHREAD_MUTEX_RECURSIVE), 0);
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#if defined ENABLE_PI
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TEST_COMPARE (pthread_mutexattr_setprotocol (&a, PTHREAD_PRIO_INHERIT), 0);
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#elif defined ENABLE_PP
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TEST_COMPARE (pthread_mutexattr_setprotocol (&a, PTHREAD_PRIO_PROTECT), 0);
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TEST_COMPARE (pthread_mutexattr_setprioceiling (&a, 6), 0);
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#endif
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int e;
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if ((e = pthread_mutex_init (m, &a)) != 0)
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{
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#ifdef ENABLE_PI
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if (e == ENOTSUP)
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FAIL_UNSUPPORTED ("PI mutexes unsupported");
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#endif
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FAIL_EXIT1 ("mutex_init failed");
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}
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TEST_COMPARE (pthread_mutex_lock (m), 0);
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TEST_COMPARE (pthread_mutexattr_destroy (&a), 0);
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puts ("going to fork now");
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pid = xfork ();
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if (pid == 0)
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{
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if (pthread_mutex_trylock (m) == 0)
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FAIL_EXIT1 ("child: mutex_trylock succeeded");
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if (pthread_mutex_unlock (m) == 0)
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FAIL_EXIT1 ("child: mutex_unlock succeeded");
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const struct timespec ts = timespec_add (xclock_now (clockid_for_get),
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make_timespec (0, 500000000));
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if (clockid == CLOCK_USE_TIMEDLOCK)
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TEST_COMPARE (pthread_mutex_timedlock (m, &ts), tmo_result);
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else
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TEST_COMPARE (pthread_mutex_clocklock (m, clockid, &ts), tmo_result);
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alarm (1);
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pthread_mutex_lock (m);
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puts ("child: mutex_lock returned");
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exit (0);
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}
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sleep (2);
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int status;
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if (TEMP_FAILURE_RETRY (waitpid (pid, &status, 0)) != pid)
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FAIL_EXIT1 ("waitpid failed");
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if (! WIFSIGNALED (status))
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FAIL_EXIT1 ("child not killed by signal");
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TEST_COMPARE (WTERMSIG (status), SIGALRM);
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}
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static int
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do_test (void)
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{
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#ifdef ENABLE_PP
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init_tpp_test ();
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#endif
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int monotonic_result =
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#ifdef ENABLE_PI
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support_mutex_pi_monotonic () ? ETIMEDOUT : EINVAL;
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#else
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ETIMEDOUT;
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#endif
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do_test_clock (CLOCK_USE_TIMEDLOCK, ETIMEDOUT);
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do_test_clock (CLOCK_REALTIME, ETIMEDOUT);
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do_test_clock (CLOCK_MONOTONIC, monotonic_result);
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return 0;
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}
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#include <support/test-driver.c>
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