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7cdb68713c
These variables were already (correctly) accessed atomically. The `volatile` qualifier doesn’t help with that. Signed-off-by: Philip Withnall <pwithnall@endlessos.org> Helps: #600
274 lines
10 KiB
C
274 lines
10 KiB
C
/* g_once_init_*() test
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* Copyright (C) 2007 Tim Janik
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*
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* This work is provided "as is"; redistribution and modification
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* in whole or in part, in any medium, physical or electronic is
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* permitted without restriction.
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* This work 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.
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* In no event shall the authors or contributors be liable for any
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* direct, indirect, incidental, special, exemplary, or consequential
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* damages (including, but not limited to, procurement of substitute
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* goods or services; loss of use, data, or profits; or business
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* interruption) however caused and on any theory of liability, whether
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* in contract, strict liability, or tort (including negligence or
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* otherwise) arising in any way out of the use of this software, even
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* if advised of the possibility of such damage.
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*/
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#include <glib.h>
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#include <stdlib.h>
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#define N_THREADS (13)
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static GMutex tmutex;
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static GCond tcond;
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static int thread_call_count = 0; /* (atomic) */
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static char dummy_value = 'x';
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static void
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assert_singleton_execution1 (void)
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{
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static int seen_execution = 0; /* (atomic) */
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int old_seen_execution = g_atomic_int_add (&seen_execution, 1);
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if (old_seen_execution != 0)
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g_error ("%s: function executed more than once", G_STRFUNC);
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}
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static void
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assert_singleton_execution2 (void)
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{
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static int seen_execution = 0; /* (atomic) */
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int old_seen_execution = g_atomic_int_add (&seen_execution, 1);
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if (old_seen_execution != 0)
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g_error ("%s: function executed more than once", G_STRFUNC);
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}
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static void
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assert_singleton_execution3 (void)
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{
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static int seen_execution = 0; /* (atomic) */
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int old_seen_execution = g_atomic_int_add (&seen_execution, 1);
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if (old_seen_execution != 0)
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g_error ("%s: function executed more than once", G_STRFUNC);
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}
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static void
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initializer1 (void)
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{
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static gsize initialized = 0;
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if (g_once_init_enter (&initialized))
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{
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gsize initval = 42;
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assert_singleton_execution1();
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g_once_init_leave (&initialized, initval);
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}
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}
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static gpointer
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initializer2 (void)
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{
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static gsize initialized = 0;
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if (g_once_init_enter (&initialized))
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{
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void *pointer_value = &dummy_value;
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assert_singleton_execution2();
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g_once_init_leave (&initialized, (gsize) pointer_value);
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}
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return (void*) initialized;
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}
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static void
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initializer3 (void)
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{
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static gsize initialized = 0;
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if (g_once_init_enter (&initialized))
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{
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gsize initval = 42;
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assert_singleton_execution3();
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g_usleep (25 * 1000); /* waste time for multiple threads to wait */
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g_once_init_leave (&initialized, initval);
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}
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}
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static gpointer
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tmain_call_initializer3 (gpointer user_data)
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{
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g_mutex_lock (&tmutex);
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g_cond_wait (&tcond, &tmutex);
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g_mutex_unlock (&tmutex);
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//g_printf ("[");
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initializer3();
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//g_printf ("]\n");
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g_atomic_int_add (&thread_call_count, 1);
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return NULL;
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}
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static void* stress_concurrent_initializers (void*);
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int
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main (int argc,
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char *argv[])
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{
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G_GNUC_UNUSED GThread *threads[N_THREADS];
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int i;
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void *p;
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/* test simple initializer */
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initializer1();
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initializer1();
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/* test pointer initializer */
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p = initializer2();
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g_assert (p == &dummy_value);
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p = initializer2();
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g_assert (p == &dummy_value);
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/* start multiple threads for initializer3() */
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g_mutex_lock (&tmutex);
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for (i = 0; i < N_THREADS; i++)
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threads[i] = g_thread_create (tmain_call_initializer3, 0, FALSE, NULL);
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g_mutex_unlock (&tmutex);
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/* concurrently call initializer3() */
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g_cond_broadcast (&tcond);
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/* loop until all threads passed the call to initializer3() */
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while (g_atomic_int_get (&thread_call_count) < i)
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{
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if (rand() % 2)
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g_thread_yield(); /* concurrent shuffling for single core */
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else
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g_usleep (1000); /* concurrent shuffling for multi core */
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g_cond_broadcast (&tcond);
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}
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/* call multiple (unoptimized) initializers from multiple threads */
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g_mutex_lock (&tmutex);
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g_atomic_int_set (&thread_call_count, 0);
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for (i = 0; i < N_THREADS; i++)
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g_thread_create (stress_concurrent_initializers, 0, FALSE, NULL);
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g_mutex_unlock (&tmutex);
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while (g_atomic_int_get (&thread_call_count) < 256 * 4 * N_THREADS)
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g_usleep (50 * 1000); /* wait for all 5 threads to complete */
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return 0;
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}
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/* get rid of g_once_init_enter-optimizations in the below definitions
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* to uncover possible races in the g_once_init_enter_impl()/
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* g_once_init_leave() implementations
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*/
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#undef g_once_init_enter
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#undef g_once_init_leave
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/* define 16 * 16 simple initializers */
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#define DEFINE_TEST_INITIALIZER(N) \
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static void \
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test_initializer_##N (void) \
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{ \
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static gsize initialized = 0; \
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if (g_once_init_enter (&initialized)) \
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{ \
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g_free (g_strdup_printf ("cpuhog%5d", 1)); \
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g_free (g_strdup_printf ("cpuhog%6d", 2)); \
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g_free (g_strdup_printf ("cpuhog%7d", 3)); \
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g_once_init_leave (&initialized, 1); \
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} \
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}
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#define DEFINE_16_TEST_INITIALIZERS(P) \
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DEFINE_TEST_INITIALIZER (P##0) \
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DEFINE_TEST_INITIALIZER (P##1) \
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DEFINE_TEST_INITIALIZER (P##2) \
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DEFINE_TEST_INITIALIZER (P##3) \
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DEFINE_TEST_INITIALIZER (P##4) \
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DEFINE_TEST_INITIALIZER (P##5) \
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DEFINE_TEST_INITIALIZER (P##6) \
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DEFINE_TEST_INITIALIZER (P##7) \
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DEFINE_TEST_INITIALIZER (P##8) \
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DEFINE_TEST_INITIALIZER (P##9) \
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DEFINE_TEST_INITIALIZER (P##a) \
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DEFINE_TEST_INITIALIZER (P##b) \
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DEFINE_TEST_INITIALIZER (P##c) \
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DEFINE_TEST_INITIALIZER (P##d) \
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DEFINE_TEST_INITIALIZER (P##e) \
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DEFINE_TEST_INITIALIZER (P##f)
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#define DEFINE_256_TEST_INITIALIZERS(P) \
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DEFINE_16_TEST_INITIALIZERS (P##_0) \
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DEFINE_16_TEST_INITIALIZERS (P##_1) \
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DEFINE_16_TEST_INITIALIZERS (P##_2) \
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DEFINE_16_TEST_INITIALIZERS (P##_3) \
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DEFINE_16_TEST_INITIALIZERS (P##_4) \
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DEFINE_16_TEST_INITIALIZERS (P##_5) \
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DEFINE_16_TEST_INITIALIZERS (P##_6) \
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DEFINE_16_TEST_INITIALIZERS (P##_7) \
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DEFINE_16_TEST_INITIALIZERS (P##_8) \
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DEFINE_16_TEST_INITIALIZERS (P##_9) \
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DEFINE_16_TEST_INITIALIZERS (P##_a) \
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DEFINE_16_TEST_INITIALIZERS (P##_b) \
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DEFINE_16_TEST_INITIALIZERS (P##_c) \
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DEFINE_16_TEST_INITIALIZERS (P##_d) \
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DEFINE_16_TEST_INITIALIZERS (P##_e) \
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DEFINE_16_TEST_INITIALIZERS (P##_f)
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/* list 16 * 16 simple initializers */
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#define LIST_16_TEST_INITIALIZERS(P) \
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test_initializer_##P##0, \
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test_initializer_##P##1, \
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test_initializer_##P##2, \
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test_initializer_##P##3, \
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test_initializer_##P##4, \
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test_initializer_##P##5, \
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test_initializer_##P##6, \
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test_initializer_##P##7, \
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test_initializer_##P##8, \
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test_initializer_##P##9, \
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test_initializer_##P##a, \
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test_initializer_##P##b, \
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test_initializer_##P##c, \
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test_initializer_##P##d, \
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test_initializer_##P##e, \
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test_initializer_##P##f
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#define LIST_256_TEST_INITIALIZERS(P) \
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LIST_16_TEST_INITIALIZERS (P##_0), \
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LIST_16_TEST_INITIALIZERS (P##_1), \
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LIST_16_TEST_INITIALIZERS (P##_2), \
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LIST_16_TEST_INITIALIZERS (P##_3), \
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LIST_16_TEST_INITIALIZERS (P##_4), \
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LIST_16_TEST_INITIALIZERS (P##_5), \
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LIST_16_TEST_INITIALIZERS (P##_6), \
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LIST_16_TEST_INITIALIZERS (P##_7), \
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LIST_16_TEST_INITIALIZERS (P##_8), \
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LIST_16_TEST_INITIALIZERS (P##_9), \
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LIST_16_TEST_INITIALIZERS (P##_a), \
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LIST_16_TEST_INITIALIZERS (P##_b), \
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LIST_16_TEST_INITIALIZERS (P##_c), \
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LIST_16_TEST_INITIALIZERS (P##_d), \
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LIST_16_TEST_INITIALIZERS (P##_e), \
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LIST_16_TEST_INITIALIZERS (P##_f)
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/* define 4 * 256 initializers */
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DEFINE_256_TEST_INITIALIZERS (stress1);
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DEFINE_256_TEST_INITIALIZERS (stress2);
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DEFINE_256_TEST_INITIALIZERS (stress3);
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DEFINE_256_TEST_INITIALIZERS (stress4);
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/* call the above 1024 initializers */
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static void*
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stress_concurrent_initializers (void *user_data)
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{
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static void (*initializers[]) (void) = {
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LIST_256_TEST_INITIALIZERS (stress1),
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LIST_256_TEST_INITIALIZERS (stress2),
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LIST_256_TEST_INITIALIZERS (stress3),
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LIST_256_TEST_INITIALIZERS (stress4),
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};
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int i;
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/* sync to main thread */
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g_mutex_lock (&tmutex);
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g_mutex_unlock (&tmutex);
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/* initialize concurrently */
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for (i = 0; i < G_N_ELEMENTS (initializers); i++)
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{
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initializers[i]();
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g_atomic_int_add (&thread_call_count, 1);
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}
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return NULL;
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}
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