1 /* Test of thread-local storage in multithreaded situations.
2 Copyright (C) 2005, 2008 Free Software Foundation, Inc.
4 This program is free software: you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 3 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <http://www.gnu.org/licenses/>. */
17 /* Written by Bruno Haible <bruno@clisp.org>, 2005. */
21 #if USE_POSIX_THREADS || USE_SOLARIS_THREADS || USE_PTH_THREADS || USE_WIN32_THREADS
24 # define TEST_POSIX_THREADS 1
26 #if USE_SOLARIS_THREADS
27 # define TEST_SOLARIS_THREADS 1
30 # define TEST_PTH_THREADS 1
33 # define TEST_WIN32_THREADS 1
36 /* Whether to help the scheduler through explicit yield().
37 Uncomment this to see if the operating system has a fair scheduler. */
38 #define EXPLICIT_YIELD 1
40 /* Whether to print debugging messages. */
41 #define ENABLE_DEBUGGING 0
43 /* Number of simultaneous threads. */
44 #define THREAD_COUNT 16
46 /* Number of operations performed in each thread. */
47 #define REPEAT_COUNT 50000
53 #include "glthread/tls.h"
54 #include "glthread/thread.h"
55 #include "glthread/yield.h"
58 # define dbgprintf printf
60 # define dbgprintf if (0) printf
64 # define yield() gl_thread_yield ()
72 /* Call yield () only with a certain probability, otherwise with GNU Pth
73 the sequence of thread activations is too predictable. */
74 if ((((unsigned int) rand () >> 3) % 4) == 0)
80 static gl_tls_key_t mykeys[KEYS_COUNT];
83 worker_thread (void *arg)
85 unsigned int id = (unsigned int) (unsigned long) arg;
87 unsigned int values[KEYS_COUNT];
89 dbgprintf ("Worker %p started\n", gl_thread_self ());
91 /* Initialize the per-thread storage. */
92 for (i = 0; i < KEYS_COUNT; i++)
94 values[i] = (((unsigned int) rand() >> 3) % 1000000) * THREAD_COUNT + id;
95 /* Hopefully no arithmetic overflow. */
96 if ((values[i] % THREAD_COUNT) != id)
101 /* Verify that the initial value is NULL. */
102 dbgprintf ("Worker %p before initial verify\n", gl_thread_self ());
103 for (i = 0; i < KEYS_COUNT; i++)
104 if (gl_tls_get (mykeys[i]) != NULL)
106 dbgprintf ("Worker %p after initial verify\n", gl_thread_self ());
109 /* Initialize the per-thread storage. */
110 dbgprintf ("Worker %p before first tls_set\n", gl_thread_self ());
111 for (i = 0; i < KEYS_COUNT; i++)
113 unsigned int *ptr = (unsigned int *) malloc (sizeof (unsigned int));
115 gl_tls_set (mykeys[i], ptr);
117 dbgprintf ("Worker %p after first tls_set\n", gl_thread_self ());
120 /* Shuffle around the pointers. */
121 for (repeat = REPEAT_COUNT; repeat > 0; repeat--)
123 dbgprintf ("Worker %p doing value swapping\n", gl_thread_self ());
124 i = ((unsigned int) rand() >> 3) % KEYS_COUNT;
125 j = ((unsigned int) rand() >> 3) % KEYS_COUNT;
128 void *vi = gl_tls_get (mykeys[i]);
129 void *vj = gl_tls_get (mykeys[j]);
131 gl_tls_set (mykeys[i], vj);
132 gl_tls_set (mykeys[j], vi);
137 /* Verify that all the values are from this thread. */
138 dbgprintf ("Worker %p before final verify\n", gl_thread_self ());
139 for (i = 0; i < KEYS_COUNT; i++)
140 if ((*(unsigned int *) gl_tls_get (mykeys[i]) % THREAD_COUNT) != id)
142 dbgprintf ("Worker %p after final verify\n", gl_thread_self ());
145 dbgprintf ("Worker %p dying.\n", gl_thread_self ());
154 for (pass = 0; pass < 2; pass++)
156 gl_thread_t threads[THREAD_COUNT];
159 for (i = 0; i < KEYS_COUNT; i++)
160 gl_tls_key_init (mykeys[i], free);
162 for (i = KEYS_COUNT - 1; i >= 0; i--)
163 gl_tls_key_init (mykeys[i], free);
165 /* Spawn the threads. */
166 for (i = 0; i < THREAD_COUNT; i++)
167 threads[i] = gl_thread_create (worker_thread, NULL);
169 /* Wait for the threads to terminate. */
170 for (i = 0; i < THREAD_COUNT; i++)
171 gl_thread_join (threads[i], NULL);
173 for (i = 0; i < KEYS_COUNT; i++)
174 gl_tls_key_destroy (mykeys[i]);
186 printf ("Starting test_tls ..."); fflush (stdout);
188 printf (" OK\n"); fflush (stdout);
195 /* No multithreading available. */
202 fputs ("Skipping test: multithreading not enabled\n", stderr);