TEST(libbacktrace, thread_multiple_dump) {
// Dump NUM_THREADS simultaneously.
std::vector<thread_t> runners(NUM_THREADS);
std::vector<dump_thread_t> dumpers(NUM_THREADS);
pthread_attr_t attr;
pthread_attr_init(&attr);
pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
for (size_t i = 0; i < NUM_THREADS; i++) {
// Launch the runners, they will spin in hard loops doing nothing.
runners[i].tid = 0;
runners[i].state = 0;
ASSERT_TRUE(pthread_create(&runners[i].threadId, &attr, ThreadMaxRun, &runners[i]) == 0);
}
// Wait for tids to be set.
for (std::vector<thread_t>::iterator it = runners.begin(); it != runners.end(); ++it) {
ASSERT_TRUE(WaitForNonZero(&it->state, 10));
}
// Start all of the dumpers at once, they will spin until they are signalled
// to begin their dump run.
int32_t dump_now = 0;
for (size_t i = 0; i < NUM_THREADS; i++) {
dumpers[i].thread.tid = runners[i].tid;
dumpers[i].thread.state = 0;
dumpers[i].done = 0;
dumpers[i].now = &dump_now;
ASSERT_TRUE(pthread_create(&dumpers[i].thread.threadId, &attr, ThreadDump, &dumpers[i]) == 0);
}
// Start all of the dumpers going at once.
android_atomic_acquire_store(1, &dump_now);
for (size_t i = 0; i < NUM_THREADS; i++) {
ASSERT_TRUE(WaitForNonZero(&dumpers[i].done, 10));
// Tell the runner thread to exit its infinite loop.
android_atomic_acquire_store(0, &runners[i].state);
ASSERT_TRUE(dumpers[i].backtrace != NULL);
VerifyMaxDump(dumpers[i].backtrace);
delete dumpers[i].backtrace;
dumpers[i].backtrace = NULL;
}
}
TEST(libbacktrace, thread_ignore_frames) {
pthread_attr_t attr;
pthread_attr_init(&attr);
pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
thread_t thread_data = { 0, 0, 0 };
pthread_t thread;
ASSERT_TRUE(pthread_create(&thread, &attr, ThreadLevelRun, &thread_data) == 0);
// Wait up to 2 seconds for the tid to be set.
ASSERT_TRUE(WaitForNonZero(&thread_data.state, 2));
UniquePtr<Backtrace> all(Backtrace::Create(getpid(), thread_data.tid));
ASSERT_TRUE(all.get() != NULL);
ASSERT_TRUE(all->Unwind(0));
UniquePtr<Backtrace> ign1(Backtrace::Create(getpid(), thread_data.tid));
ASSERT_TRUE(ign1.get() != NULL);
ASSERT_TRUE(ign1->Unwind(1));
UniquePtr<Backtrace> ign2(Backtrace::Create(getpid(), thread_data.tid));
ASSERT_TRUE(ign2.get() != NULL);
ASSERT_TRUE(ign2->Unwind(2));
VerifyIgnoreFrames(all.get(), ign1.get(), ign2.get(), NULL);
// Tell the thread to exit its infinite loop.
android_atomic_acquire_store(0, &thread_data.state);
}
TEST(libbacktrace, thread_ignore_frames) {
pthread_attr_t attr;
pthread_attr_init(&attr);
pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
thread_t thread_data = { 0, 0, 0 };
pthread_t thread;
ASSERT_TRUE(pthread_create(&thread, &attr, ThreadLevelRun, &thread_data) == 0);
// Wait up to 2 seconds for the tid to be set.
ASSERT_TRUE(WaitForNonZero(&thread_data.state, 2));
backtrace_context_t all;
ASSERT_TRUE(backtrace_create_context(&all, getpid(), thread_data.tid, 0));
backtrace_context_t ign1;
ASSERT_TRUE(backtrace_create_context(&ign1, getpid(), thread_data.tid, 1));
backtrace_context_t ign2;
ASSERT_TRUE(backtrace_create_context(&ign2, getpid(), thread_data.tid, 2));
VerifyIgnoreFrames(all.backtrace, ign1.backtrace, ign2.backtrace, NULL);
backtrace_destroy_context(&all);
backtrace_destroy_context(&ign1);
backtrace_destroy_context(&ign2);
// Tell the thread to exit its infinite loop.
android_atomic_acquire_store(0, &thread_data.state);
}
TEST(libbacktrace, thread_level_trace) {
pthread_attr_t attr;
pthread_attr_init(&attr);
pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
thread_t thread_data = { 0, 0, 0 };
pthread_t thread;
ASSERT_TRUE(pthread_create(&thread, &attr, ThreadLevelRun, &thread_data) == 0);
// Wait up to 2 seconds for the tid to be set.
ASSERT_TRUE(WaitForNonZero(&thread_data.state, 2));
// Save the current signal action and make sure it is restored afterwards.
struct sigaction cur_action;
ASSERT_TRUE(sigaction(SIGURG, NULL, &cur_action) == 0);
UniquePtr<Backtrace> backtrace(Backtrace::Create(getpid(), thread_data.tid));
ASSERT_TRUE(backtrace.get() != NULL);
ASSERT_TRUE(backtrace->Unwind(0));
VerifyLevelDump(backtrace.get());
// Tell the thread to exit its infinite loop.
android_atomic_acquire_store(0, &thread_data.state);
// Verify that the old action was restored.
struct sigaction new_action;
ASSERT_TRUE(sigaction(SIGURG, NULL, &new_action) == 0);
EXPECT_EQ(cur_action.sa_sigaction, new_action.sa_sigaction);
EXPECT_EQ(cur_action.sa_flags, new_action.sa_flags);
}
void ThreadSetState(void* data) {
thread_t* thread = reinterpret_cast<thread_t*>(data);
android_atomic_acquire_store(1, &thread->state);
volatile int i = 0;
while (thread->state) {
i++;
}
}
status_t V4L2VideoNode::open()
{
status_t status(NO_ERROR);
status = V4L2DeviceBase::open();
if (status == NO_ERROR)
mState = DEVICE_OPEN;
android_atomic_acquire_store(0,&mBuffersInDevice);
return status;
}
void* ThreadDump(void* data) {
dump_thread_t* dump = reinterpret_cast<dump_thread_t*>(data);
while (true) {
if (android_atomic_acquire_load(dump->now)) {
break;
}
}
// The status of the actual unwind will be checked elsewhere.
dump->backtrace = Backtrace::Create(getpid(), dump->thread.tid);
dump->backtrace->Unwind(0);
android_atomic_acquire_store(1, &dump->done);
return NULL;
}
/*
* this is called by our "fake" BpGraphicBufferProducer. We package the
* data and reply Parcel and forward them to the calling thread.
*/
virtual status_t transact(uint32_t code,
const Parcel& data, Parcel* reply, uint32_t flags) {
this->code = code;
this->data = &data;
this->reply = reply;
android_atomic_acquire_store(0, &memoryBarrier);
if (exitPending) {
// if we've exited, we run the message synchronously right here
handleMessage(Message(MSG_API_CALL));
} else {
barrier.close();
looper->sendMessage(this, Message(MSG_API_CALL));
barrier.wait();
}
return NO_ERROR;
}
status_t V4L2VideoNode::close()
{
status_t status(NO_ERROR);
if (mState == DEVICE_STARTED) {
stop();
}
if (!mBufferPool.isEmpty()) {
destroyBufferPool();
}
status = V4L2DeviceBase::close();
if (status == NO_ERROR)
mState = DEVICE_CLOSED;
android_atomic_acquire_store(0,&mBuffersInDevice);
return status;
}
void* ThreadDump(void* data) {
dump_thread_t* dump = reinterpret_cast<dump_thread_t*>(data);
while (true) {
if (android_atomic_acquire_load(dump->now)) {
break;
}
}
dump->context.data = NULL;
dump->context.backtrace = NULL;
// The status of the actual unwind will be checked elsewhere.
backtrace_create_context(&dump->context, getpid(), dump->thread.tid, 0);
android_atomic_acquire_store(1, &dump->done);
return NULL;
}
TEST(libbacktrace, thread_max_trace) {
pthread_attr_t attr;
pthread_attr_init(&attr);
pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
thread_t thread_data = { 0, 0, 0 };
pthread_t thread;
ASSERT_TRUE(pthread_create(&thread, &attr, ThreadMaxRun, &thread_data) == 0);
// Wait for the tid to be set.
ASSERT_TRUE(WaitForNonZero(&thread_data.state, 2));
UniquePtr<Backtrace> backtrace(Backtrace::Create(getpid(), thread_data.tid));
ASSERT_TRUE(backtrace.get() != NULL);
ASSERT_TRUE(backtrace->Unwind(0));
VerifyMaxDump(backtrace.get());
// Tell the thread to exit its infinite loop.
android_atomic_acquire_store(0, &thread_data.state);
}
void MonoPipe::updateFrontAndNRPTS(int32_t newFront, int64_t newNextRdPTS)
{
// Set the MSB of the update sequence number to indicate that there is a
// multi-variable update in progress. Use an atomic store with an "acquire"
// barrier to make sure that the next operations cannot be re-ordered and
// take place before the change to mUpdateSeq is commited..
int32_t tmp = mUpdateSeq | 0x80000000;
android_atomic_acquire_store(tmp, &mUpdateSeq);
// Update mFront and mNextRdPTS
mFront = newFront;
mNextRdPTS = newNextRdPTS;
// We are finished with the update. Compute the next sequnce number (which
// should be the old sequence number, plus one, and with the MSB cleared)
// and then store it in mUpdateSeq using an atomic store with a "release"
// barrier so our update operations cannot be re-ordered past the update of
// the sequence number.
tmp = (tmp + 1) & 0x7FFFFFFF;
android_atomic_release_store(tmp, &mUpdateSeq);
}
TEST(libbacktrace, thread_max_trace) {
pthread_attr_t attr;
pthread_attr_init(&attr);
pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
thread_t thread_data = { 0, 0, 0 };
pthread_t thread;
ASSERT_TRUE(pthread_create(&thread, &attr, ThreadMaxRun, &thread_data) == 0);
// Wait for the tid to be set.
ASSERT_TRUE(WaitForNonZero(&thread_data.state, 2));
backtrace_context_t context;
ASSERT_TRUE(backtrace_create_context(&context, getpid(), thread_data.tid, 0));
VerifyMaxDump(context.backtrace);
backtrace_destroy_context(&context);
// Tell the thread to exit its infinite loop.
android_atomic_acquire_store(0, &thread_data.state);
}
