1 /* Test program for timedout read/write lock functions.
2 Copyright (C) 2000 Free Software Foundation, Inc.
3 Contributed by Ulrich Drepper <drepper@redhat.com>, 2000.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Library General Public License as
7 published by the Free Software Foundation; either version 2 of the
8 License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Library General Public License for more details.
15 You should have received a copy of the GNU Library General Public
16 License along with the GNU C Library; see the file COPYING.LIB. If not,
17 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA. */
34 #define TIMEOUT 1000000
37 static pthread_rwlock_t lock
= PTHREAD_RWLOCK_WRITER_NONRECURSIVE_INITIALIZER_NP
;
41 writer_thread (void *nr
)
44 struct timespec delay
;
51 delay
.tv_nsec
= DELAY
;
53 for (n
= 0; n
< WRITETRIES
; ++n
)
57 clock_gettime (CLOCK_REALTIME
, &ts
);
59 ts
.tv_nsec
+= 2 * TIMEOUT
;
61 printf ("writer thread %ld tries again\n", (long int) nr
);
63 //while (pthread_rwlock_wrlock (&lock), 0);
64 while (pthread_rwlock_timedwrlock (&lock
, &ts
) == ETIMEDOUT
);
66 printf ("writer thread %ld succeeded\n", (long int) nr
);
68 nanosleep (&delay
, NULL
);
70 pthread_rwlock_unlock (&lock
);
72 printf ("writer thread %ld released\n", (long int) nr
);
80 reader_thread (void *nr
)
83 struct timespec delay
;
87 delay
.tv_nsec
= DELAY
;
89 for (n
= 0; n
< READTRIES
; ++n
)
93 clock_gettime (CLOCK_REALTIME
, &ts
);
95 ts
.tv_nsec
+= TIMEOUT
;
97 printf ("reader thread %ld tries again\n", (long int) nr
);
99 //while (pthread_rwlock_rdlock (&lock), 0);
100 while (pthread_rwlock_timedrdlock (&lock
, &ts
) == ETIMEDOUT
);
102 printf ("reader thread %ld succeeded\n", (long int) nr
);
104 nanosleep (&delay
, NULL
);
106 pthread_rwlock_unlock (&lock
);
108 printf ("reader thread %ld released\n", (long int) nr
);
118 pthread_t thwr
[NWRITERS
];
119 pthread_t thrd
[NREADERS
];
123 /* Make standard error the same as standard output. */
126 /* Make sure we see all message, even those on stdout. */
127 setvbuf (stdout
, NULL
, _IONBF
, 0);
129 for (n
= 0; n
< NWRITERS
; ++n
)
131 int err
= pthread_create (&thwr
[n
], NULL
, writer_thread
,
132 (void *) (long int) n
);
135 error (EXIT_FAILURE
, err
, "cannot create writer thread");
138 for (n
= 0; n
< NREADERS
; ++n
)
140 int err
= pthread_create (&thrd
[n
], NULL
, reader_thread
,
141 (void *) (long int) n
);
144 error (EXIT_FAILURE
, err
, "cannot create reader thread");
147 /* Wait for all the threads. */
148 for (n
= 0; n
< NWRITERS
; ++n
)
149 pthread_join (thwr
[n
], &res
);
150 for (n
= 0; n
< NREADERS
; ++n
)
151 pthread_join (thrd
[n
], &res
);