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7b9645a7d1
Libvirt's original atomic ops impls were largely copied from GLib's code at the time. The only API difference was that libvirt's virAtomicIntInc() would return a value, but g_atomic_int_inc was void. We thus use g_atomic_int_add(v, 1) instead, though this means virAtomicIntInc() now returns the original value, instead of the new value. This rewrites libvirt's impl in terms of g_atomic_int* as a short term conversion. The key motivation was to quickly eliminate use of GNULIB's verify_expr() macro which is not a direct match for G_STATIC_ASSERT_EXPR. Long term all the callers should be updated to use g_atomic_int* directly. Reviewed-by: Pavel Hrdina <phrdina@redhat.com> Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
176 lines
3.5 KiB
C
176 lines
3.5 KiB
C
/*
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* Copyright (C) 2011-2013 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see
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* <http://www.gnu.org/licenses/>.
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*
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*/
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#include <config.h>
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#include <time.h>
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#include <sched.h>
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#include "testutils.h"
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#include "viratomic.h"
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#include "virrandom.h"
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#include "virthread.h"
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static int
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testTypes(const void *data G_GNUC_UNUSED)
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{
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unsigned int u, u2;
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int s, s2;
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bool res;
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#define testAssertEq(a, b) \
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if (!(a == b)) \
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return -1;
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virAtomicIntSet(&u, 5);
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u2 = virAtomicIntGet(&u);
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testAssertEq(u2, 5);
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res = virAtomicIntCompareExchange(&u, 6, 7);
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if (res)
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return -1;
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testAssertEq(u, 5);
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testAssertEq(virAtomicIntAdd(&u, 1), 5);
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testAssertEq(u, 6);
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testAssertEq(virAtomicIntInc(&u), 6);
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testAssertEq(u, 7);
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res = virAtomicIntDecAndTest(&u);
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if (res)
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return -1;
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testAssertEq(u, 6);
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u2 = virAtomicIntAnd(&u, 5);
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testAssertEq(u2, 6);
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testAssertEq(u, 4);
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u2 = virAtomicIntOr(&u, 8);
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testAssertEq(u2, 4);
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testAssertEq(u, 12);
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u2 = virAtomicIntXor(&u, 4);
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testAssertEq(u2, 12);
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testAssertEq(u, 8);
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virAtomicIntSet(&s, 5);
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s2 = virAtomicIntGet(&s);
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testAssertEq(s2, 5);
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res = virAtomicIntCompareExchange(&s, 6, 7);
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if (res)
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return -1;
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testAssertEq(s, 5);
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virAtomicIntAdd(&s, 1);
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testAssertEq(s, 6);
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virAtomicIntInc(&s);
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testAssertEq(s, 7);
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res = virAtomicIntDecAndTest(&s);
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if (res)
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return -1;
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testAssertEq(s, 6);
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s2 = virAtomicIntAnd(&s, 5);
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testAssertEq(s2, 6);
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testAssertEq(s, 4);
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s2 = virAtomicIntOr(&s, 8);
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testAssertEq(s2, 4);
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testAssertEq(s, 12);
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s2 = virAtomicIntXor(&s, 4);
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testAssertEq(s2, 12);
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testAssertEq(s, 8);
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return 0;
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}
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#define THREADS 10
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#define ROUNDS 10000
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volatile int bucket[THREADS];
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volatile int atomic;
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static void
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thread_func(void *data)
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{
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int idx = (intptr_t)data;
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size_t i;
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int d;
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for (i = 0; i < ROUNDS; i++) {
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d = virRandomBits(7);
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bucket[idx] += d;
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virAtomicIntAdd(&atomic, d);
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#ifdef WIN32
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SleepEx(0, 0);
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#else
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sched_yield();
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#endif
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}
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}
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static int
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testThreads(const void *data G_GNUC_UNUSED)
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{
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int sum;
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size_t i;
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virThread threads[THREADS];
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atomic = 0;
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for (i = 0; i < THREADS; i++)
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bucket[i] = 0;
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for (i = 0; i < THREADS; i++) {
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if (virThreadCreate(&(threads[i]), true, thread_func, (void*)(intptr_t)i) < 0)
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return -1;
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}
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for (i = 0; i < THREADS; i++)
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virThreadJoin(&threads[i]);
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sum = 0;
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for (i = 0; i < THREADS; i++)
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sum += bucket[i];
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if (sum != atomic)
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return -1;
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return 0;
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}
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static int
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mymain(void)
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{
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int ret = 0;
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if (virTestRun("types", testTypes, NULL) < 0)
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ret = -1;
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if (virTestRun("threads", testThreads, NULL) < 0)
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ret = -1;
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return ret;
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}
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VIR_TEST_MAIN(mymain)
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