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133 lines
3.0 KiB
C
133 lines
3.0 KiB
C
/*
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* Copyright © 2008 Ryan Lortie
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* Copyright © 2010 Codethink Limited
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* See the included COPYING file for more information.
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*/
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/* LOCKS should be more than the number of contention
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* counters in gthread.c in order to ensure we exercise
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* the case where they overlap.
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*/
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#define LOCKS 48
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#define ITERATIONS 10000
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#define THREADS 100
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#if TEST_EMULATED_FUTEX
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/* this is defined for the 1bit-mutex-emufutex test.
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*
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* we want to test the emulated futex even if futex(2) is available.
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*/
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/* side-step some glib build stuff */
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#define GLIB_COMPILATION
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/* rebuild gbitlock.c without futex support,
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defining our own version of the g_bit_*lock symbols
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*/
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#define g_bit_lock _emufutex_g_bit_lock
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#define g_bit_trylock _emufutex_g_bit_trylock
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#define g_bit_unlock _emufutex_g_bit_unlock
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#define _g_futex_thread_init _emufutex_g_futex_thread_init
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#define G_BIT_LOCK_FORCE_FUTEX_EMULATION
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#include <glib/gbitlock.c>
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#endif
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#include <glib.h>
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volatile GThread *owners[LOCKS];
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volatile gint locks[LOCKS];
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volatile gint bits[LOCKS];
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static void
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acquire (int nr)
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{
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GThread *self;
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self = g_thread_self ();
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if (!g_bit_trylock (&locks[nr], bits[nr]))
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{
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if (g_test_verbose ())
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g_print ("thread %p going to block on lock %d\n", self, nr);
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g_bit_lock (&locks[nr], bits[nr]);
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}
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g_assert (owners[nr] == NULL); /* hopefully nobody else is here */
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owners[nr] = self;
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/* let some other threads try to ruin our day */
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g_thread_yield ();
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g_thread_yield ();
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g_thread_yield ();
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g_assert (owners[nr] == self); /* hopefully this is still us... */
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owners[nr] = NULL; /* make way for the next guy */
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g_bit_unlock (&locks[nr], bits[nr]);
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}
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static gpointer
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thread_func (gpointer data)
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{
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gint i;
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for (i = 0; i < ITERATIONS; i++)
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acquire (g_random_int () % LOCKS);
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return NULL;
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}
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static void
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testcase (void)
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{
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GThread *threads[THREADS];
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int i;
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g_thread_init (NULL);
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#ifdef TEST_EMULATED_FUTEX
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_g_futex_thread_init ();
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#define SUFFIX "-emufutex"
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/* ensure that we are using the emulated futex by checking
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* (at compile-time) for the existance of 'g_futex_mutex'
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*/
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g_assert (g_futex_mutex != NULL);
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#else
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#define SUFFIX ""
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#endif
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for (i = 0; i < LOCKS; i++)
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bits[i] = g_random_int () % 32;
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for (i = 0; i < THREADS; i++)
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threads[i] = g_thread_create (thread_func, NULL, TRUE, NULL);
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for (i = 0; i < THREADS; i++)
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g_thread_join (threads[i]);
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for (i = 0; i < LOCKS; i++)
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{
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g_assert (owners[i] == NULL);
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g_assert (locks[i] == 0);
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}
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}
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int
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main (int argc, char **argv)
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{
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g_test_init (&argc, &argv, NULL);
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g_test_add_func ("/glib/1bit-mutex" SUFFIX, testcase);
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return g_test_run ();
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}
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