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/***
This file is part of PulseAudio.
Copyright 2014 David Henningsson, Canonical Ltd.
PulseAudio is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published
by the Free Software Foundation; either version 2.1 of the License,
or (at your option) any later version.
PulseAudio is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
***/
/* This test spawns two threads on distinct cpu-cores that pass a value
* between each other through shared memory protected by pa_atomic_t.
* Thread "left" continuously increments a value and writes its contents to memory.
* Thread "right" continuously reads the value and checks whether it was incremented.
*
* With the pa_atomic_load/pa_atomic_store implementations based on __sync_synchronize,
* this will fail after some time (sometimes 2 seconds, sometimes 8 hours) at least
* on ARM Cortex-A53 and ARM Cortex-A57 systems.
*
* On x86_64, it does not.
*
* The chosen implementation in some way mimics a situation that can also occur
* using memfd srbchannel transport.
*
* NOTE: This is a long-running test, so don't execute in normal test suite.
*
* */
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <unistd.h>
#include <check.h>
#include <pulsecore/thread.h>
#include <pulse/rtclock.h>
#include <pulse/xmalloc.h>
#include <pulsecore/semaphore.h>
#include <pthread.h>
#include <pulsecore/atomic.h>
#define MEMORY_SIZE (8 * 2 * 1024 * 1024)
typedef struct io_t {
pa_atomic_t *flag;
char* memory;
cpu_set_t cpuset;
} io_t;
static void read_func(void* data) {
io_t *io = (io_t *) data;
size_t expect = 0;
size_t value = 0;
pthread_setaffinity_np(pthread_self(), sizeof(cpu_set_t), &io->cpuset);
while(1) {
if(pa_atomic_load(io->flag) == 1) {
memcpy(&value, io->memory, sizeof(value));
pa_atomic_sub(io->flag, 1);
ck_assert_uint_eq(value, expect);
++expect;
}
}
}
static void write_func(void* data) {
io_t *io = (io_t *) data;
size_t value = 0;
pthread_setaffinity_np(pthread_self(), sizeof(cpu_set_t), &io->cpuset);
while(1) {
if(pa_atomic_load(io->flag) == 0) {
memcpy(io->memory, &value, sizeof(value));
pa_atomic_add(io->flag, 1);
++value;
}
}
}
START_TEST (atomic_test) {
pa_thread *thread1, *thread2;
io_t io1, io2;
char* memory = pa_xmalloc0(MEMORY_SIZE);
pa_atomic_t flag = PA_ATOMIC_INIT(0);
memset(memory, 0, MEMORY_SIZE);
/* intentionally misalign memory since srbchannel also does not
* always read/write aligned. Might be a red hering. */
io1.memory = io2.memory = memory + 1025;
io1.flag = io2.flag = &flag;
CPU_ZERO(&io1.cpuset);
CPU_SET(1, &io1.cpuset);
thread1 = pa_thread_new("left", &write_func, &io1);
CPU_ZERO(&io2.cpuset);
CPU_SET(3, &io2.cpuset);
thread2 = pa_thread_new("right", &read_func, &io2);
pa_thread_free(thread1);
pa_thread_free(thread2);
pa_xfree(memory);
}
END_TEST
int main(int argc, char *argv[]) {
int failed = 0;
Suite *s;
TCase *tc;
SRunner *sr;
if (!getenv("MAKE_CHECK"))
pa_log_set_level(PA_LOG_DEBUG);
s = suite_create("atomic");
tc = tcase_create("atomic");
tcase_add_test(tc, atomic_test);
suite_add_tcase(s, tc);
sr = srunner_create(s);
srunner_run_all(sr, CK_NORMAL);
failed = srunner_ntests_failed(sr);
srunner_free(sr);
return (failed == 0) ? EXIT_SUCCESS : EXIT_FAILURE;
}
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