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Diffstat (limited to 'nptl/tst-rwlock12.c')
| -rw-r--r-- | nptl/tst-rwlock12.c | 216 |
1 files changed, 216 insertions, 0 deletions
diff --git a/nptl/tst-rwlock12.c b/nptl/tst-rwlock12.c new file mode 100644 index 0000000000..159d469afc --- /dev/null +++ b/nptl/tst-rwlock12.c @@ -0,0 +1,216 @@ +/* Copyright (C) 2002, 2003 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper <drepper@redhat.com>, 2002. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <errno.h> +#include <pthread.h> +#include <stdint.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> +#include <sys/mman.h> +#include <sys/wait.h> + + +static int +do_test (void) +{ +#if ! _POSIX_THREAD_PROCESS_SHARED + + puts ("_POSIX_THREAD_PROCESS_SHARED not supported, test skipped"); + return 0; + +#else + + size_t ps = sysconf (_SC_PAGESIZE); + char tmpfname[] = "/tmp/tst-rwlock12.XXXXXX"; + char data[ps]; + void *mem; + int fd; + pthread_mutex_t *m; + pthread_mutexattr_t ma; + pthread_rwlock_t *r; + pthread_rwlockattr_t ra; + pid_t pid; + int status = 0; + + fd = mkstemp (tmpfname); + if (fd == -1) + { + printf ("cannot open temporary file: %m\n"); + return 1; + } + + /* Make sure it is always removed. */ + unlink (tmpfname); + + /* Create one page of data. */ + memset (data, '\0', ps); + + /* Write the data to the file. */ + if (write (fd, data, ps) != (ssize_t) ps) + { + puts ("short write"); + return 1; + } + + mem = mmap (NULL, ps, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); + if (mem == MAP_FAILED) + { + printf ("mmap failed: %m\n"); + return 1; + } + + r = (pthread_rwlock_t *) (((uintptr_t) mem + __alignof (pthread_rwlock_t)) + & ~(__alignof (pthread_rwlock_t) - 1)); + /* The following assumes alignment for a mutex is at least as high + as that for a rwlock. Which is true in our case. */ + m = (pthread_mutex_t *) (r + 1); + + if (pthread_rwlockattr_init (&ra) != 0) + { + puts ("rwlockattr_init failed"); + return 1; + } + + if (pthread_rwlockattr_setpshared (&ra, PTHREAD_PROCESS_SHARED) != 0) + { + puts ("rwlockattr_setpshared failed"); + return 1; + } + + if (pthread_rwlock_init (r, &ra) != 0) + { + puts ("rwlock_init failed"); + return 1; + } + + if (pthread_mutexattr_init (&ma) != 0) + { + puts ("rwlockattr_init failed"); + return 1; + } + + if (pthread_mutexattr_setpshared (&ma, PTHREAD_PROCESS_SHARED) != 0) + { + puts ("mutexattr_setpshared failed"); + return 1; + } + + if (pthread_mutex_init (m, &ma) != 0) + { + puts ("mutex_init failed"); + return 1; + } + + /* Lock the mutex. */ + if (pthread_mutex_lock (m) != 0) + { + puts ("mutex_lock failed"); + return 1; + } + + puts ("going to fork now"); + pid = fork (); + if (pid == -1) + { + puts ("fork failed"); + return 1; + } + else if (pid == 0) + { + /* Lock the mutex. */ + if (pthread_mutex_lock (m) != 0) + { + puts ("child: mutex_lock failed"); + return 1; + } + + /* Try to get the rwlock. */ + if (pthread_rwlock_trywrlock (r) == 0) + { + puts ("rwlock_trywrlock succeeded"); + return 1; + } + + /* Try again. */ + struct timespec ts = { .tv_sec = 0, .tv_nsec = 500000000 }; + int e = pthread_rwlock_timedwrlock (r, &ts); + if (e == 0) + { + puts ("rwlock_timedwrlock succeeded"); + return 1; + } + if (e != ETIMEDOUT) + { + puts ("rwlock_timedwrlock didn't return ETIMEDOUT"); + status = 1; + } + + if (pthread_rwlock_tryrdlock (r) == 0) + { + puts ("rwlock_tryrdlock succeeded"); + return 1; + } + + e = pthread_rwlock_timedrdlock (r, &ts); + if (e == 0) + { + puts ("rwlock_timedrdlock succeeded"); + return 1; + } + if (e != ETIMEDOUT) + { + puts ("rwlock_timedrdlock didn't return ETIMEDOUT"); + status = 1; + } + } + else + { + /* Lock the rwlock for writing. */ + if (pthread_rwlock_wrlock (r) != 0) + { + puts ("rwlock_wrlock failed"); + kill (pid, SIGTERM); + return 1; + } + + /* Allow the child to run. */ + if (pthread_mutex_unlock (m) != 0) + { + puts ("mutex_unlock failed"); + kill (pid, SIGTERM); + return 1; + } + + /* Just wait for the child. */ + if (TEMP_FAILURE_RETRY (waitpid (pid, &status, 0)) != pid) + { + puts ("waitpid failed"); + kill (pid, SIGTERM); + return 1; + } + } + + return status; +#endif +} + +#define TEST_FUNCTION do_test () +#include "../test-skeleton.c" |