diff options
Diffstat (limited to 'nptl/tst-rwlock4.c')
| -rw-r--r-- | nptl/tst-rwlock4.c | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/nptl/tst-rwlock4.c b/nptl/tst-rwlock4.c new file mode 100644 index 0000000..2bf5416 --- /dev/null +++ b/nptl/tst-rwlock4.c @@ -0,0 +1,187 @@ +/* Copyright (C) 2002 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> + + +int +main (void) +{ + size_t ps = sysconf (_SC_PAGESIZE); + char tmpfname[] = "/tmp/tst-rwlock4.XXXXXX"; + char data[ps]; + void *mem; + int fd; + pthread_rwlock_t *r; + pthread_rwlockattr_t a; + pid_t pid; + char *p; + int err; + int s; + + fd = mkstemp (tmpfname); + if (fd == -1) + { + printf ("cannot open temporary file: %m\n"); + exit (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) != ps) + { + puts ("short write"); + exit (1); + } + + mem = mmap (NULL, ps, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); + if (mem == MAP_FAILED) + { + printf ("mmap failed: %m\n"); + exit (1); + } + + r = (pthread_rwlock_t *) (((uintptr_t) mem + __alignof (pthread_rwlock_t)) + & ~(__alignof (pthread_rwlock_t) - 1)); + p = (char *) (r + 1); + + if (pthread_rwlockattr_init (&a) != 0) + { + puts ("rwlockattr_init failed"); + exit (1); + } + + if (pthread_rwlockattr_getpshared (&a, &s) != 0) + { + puts ("1st rwlockattr_getpshared failed"); + exit (1); + } + + if (s != PTHREAD_PROCESS_PRIVATE) + { + puts ("default pshared value wrong"); + exit (1); + } + + if (pthread_rwlockattr_setpshared (&a, PTHREAD_PROCESS_SHARED) != 0) + { + puts ("rwlockattr_setpshared failed"); + exit (1); + } + + if (pthread_rwlockattr_getpshared (&a, &s) != 0) + { + puts ("2nd rwlockattr_getpshared failed"); + exit (1); + } + + if (s != PTHREAD_PROCESS_SHARED) + { + puts ("pshared value after setpshared call wrong"); + exit (1); + } + + if (pthread_rwlock_init (r, &a) != 0) + { + puts ("rwlock_init failed"); + exit (1); + } + + if (pthread_rwlock_rdlock (r) != 0) + { + puts ("rwlock_rdlock failed"); + exit (1); + } + + if (pthread_rwlockattr_destroy (&a) != 0) + { + puts ("rwlockattr_destroy failed"); + exit (1); + } + + err = pthread_rwlock_trywrlock (r); + if (err == 0) + { + puts ("rwlock_trywrlock succeeded"); + exit (1); + } + else if (err != EBUSY) + { + puts ("rwlock_trywrlock didn't return EBUSY"); + exit (1); + } + + *p = 0; + + puts ("going to fork now"); + pid = fork (); + if (pid == -1) + { + puts ("fork failed"); + exit (1); + } + else if (pid == 0) + { + /* Play some lock ping-pong. It's our turn to unlock first. */ + if ((*p)++ != 0) + { + puts ("child: *p != 0"); + exit (1); + } + + if (pthread_rwlock_unlock (r) != 0) + { + puts ("child: 1st rwlock_unlock failed"); + exit (1); + } + + puts ("child done"); + } + else + { + if (pthread_rwlock_wrlock (r) != 0) + { + puts ("parent: rwlock_wrlock failed"); + exit (1); + } + + if (*p != 1) + { + puts ("*p != 1"); + exit (1); + } + + puts ("parent done"); + } + + exit (0); +} |