static int get_pmem_file_info(dev_t* device, ino_t* serial_number)
{
static int write_values_initiated = 0;
static int error_occured_when_retreiving_pmem_file_info = 0;
static int error_code_produced_when_retreiving_pmem_file_info;
static int cached_values_present = 0;
static dev_t pmem_files_device;
static ino_t pmem_files_serial_number;
struct stat pmem_file_info;
if (error_occured_when_retreiving_pmem_file_info)
{
errno = error_code_produced_when_retreiving_pmem_file_info;
return 0;
}
else if (cached_values_present)
{
*device = pmem_files_device;
*serial_number = pmem_files_serial_number;
return 1;
}
if (stat("/dev/pmem_hwb", &pmem_file_info) < 0)
{
if (0 == android_atomic_cmpxchg(0, 1, &write_values_initiated))
{
error_code_produced_when_retreiving_pmem_file_info = errno;
android_atomic_write(1, &error_occured_when_retreiving_pmem_file_info);
}
return 0;
}
if (0 == android_atomic_cmpxchg(0, 1, &write_values_initiated))
{
pmem_files_device = pmem_file_info.st_dev;
pmem_files_serial_number = pmem_file_info.st_ino;
android_atomic_write(1, &cached_values_present);
}
*device = pmem_file_info.st_dev;
*serial_number = pmem_file_info.st_ino;
return 1;
}
int gralloc_unlock(gralloc_module_t const* module,
buffer_handle_t handle)
{
if (private_handle_t::validate(handle) < 0)
return -EINVAL;
private_handle_t* hnd = (private_handle_t*)handle;
int32_t current_value, new_value;
do {
current_value = hnd->lockState;
new_value = current_value;
if (current_value & private_handle_t::LOCK_STATE_WRITE) {
// locked for write
if (hnd->writeOwner == gettid()) {
hnd->writeOwner = 0;
new_value &= ~private_handle_t::LOCK_STATE_WRITE;
}
}
if ((new_value & private_handle_t::LOCK_STATE_READ_MASK) == 0) {
LOGE("handle %p not locked", handle);
return -EINVAL;
}
new_value--;
} while (android_atomic_cmpxchg(current_value, new_value,
(volatile int32_t*)&hnd->lockState));
return 0;
}
void BBinder::attachObject(
const void* objectID, void* object, void* cleanupCookie,
object_cleanup_func func)
{
Extras* e = mExtras;
if (!e) {
e = new Extras;
#ifdef __LP64__
if (android_atomic_release_cas64(0, reinterpret_cast<int64_t>(e),
reinterpret_cast<volatile int64_t*>(&mExtras)) != 0) {
#else
if (android_atomic_cmpxchg(0, reinterpret_cast<int32_t>(e),
reinterpret_cast<volatile int32_t*>(&mExtras)) != 0) {
#endif
delete e;
e = mExtras;
}
if (e == 0) return; // out of memory
}
AutoMutex _l(e->mLock);
e->mObjects.attach(objectID, object, cleanupCookie, func);
}
void* BBinder::findObject(const void* objectID) const
{
Extras* e = mExtras;
if (!e) return NULL;
AutoMutex _l(e->mLock);
return e->mObjects.find(objectID);
}
int gralloc_unlock_pmem(gralloc_module_t const* module,
struct hwmem_gralloc_buf_handle_t* hnd)
{
int32_t current_value, new_value;
do {
current_value = hnd->lockState;
new_value = current_value;
if (current_value & LOCK_STATE_WRITE) {
// locked for write
if (hnd->writeOwner == gettid()) {
hnd->writeOwner = 0;
new_value &= ~LOCK_STATE_WRITE;
}
}
if ((new_value & LOCK_STATE_READ_MASK) == 0) {
ALOGE("handle %p not locked", hnd);
return -EINVAL;
}
new_value--;
} while (android_atomic_cmpxchg(current_value, new_value,
(volatile int32_t*)&hnd->lockState));
return 0;
}
ssize_t SharedBufferServer::RetireUpdate::operator()() {
int32_t head = stack.head;
if (uint32_t(head) >= SharedBufferStack::NUM_BUFFER_MAX)
return BAD_VALUE;
// Decrement the number of queued buffers
int32_t queued;
do {
queued = stack.queued;
if (queued == 0) {
return NOT_ENOUGH_DATA;
}
} while (android_atomic_cmpxchg(queued, queued-1, &stack.queued));
// lock the buffer before advancing head, which automatically unlocks
// the buffer we preventively locked upon entering this function
head = (head + 1) % numBuffers;
const int8_t headBuf = stack.index[head];
stack.headBuf = headBuf;
// head is only modified here, so we don't need to use cmpxchg
android_atomic_write(head, &stack.head);
// now that head has moved, we can increment the number of available buffers
android_atomic_inc(&stack.available);
return head;
}
UINT64 GKI_now_us()
{
struct timespec ts_now;
#ifdef HAVE_ANDROID_OS
static int s_fd = -1;
int result;
if (s_fd == -1) {
int fd = open("/dev/alarm", O_RDONLY);
if (android_atomic_cmpxchg(-1, fd, &s_fd)) {
close(fd);
}
}
result = ioctl(s_fd,
ANDROID_ALARM_GET_TIME(ANDROID_ALARM_ELAPSED_REALTIME), &ts_now);
if (result != 0) {
#endif
clock_gettime(CLOCK_BOOTTIME, &ts_now);
#ifdef HAVE_ANDROID_OS
}
#endif
return ((UINT64)ts_now.tv_sec * USEC_PER_SEC) + ((UINT64)ts_now.tv_nsec / NSEC_PER_USEC);
}
/*
* native public static long elapsedRealtime();
*/
int64_t elapsedRealtime()
{
#ifdef HAVE_ANDROID_OS
static int s_fd = -1;
if (s_fd == -1) {
int fd = open("/dev/alarm", O_RDONLY);
if (android_atomic_cmpxchg(-1, fd, &s_fd)) {
close(fd);
}
}
struct timespec ts;
int result = ioctl(s_fd,
ANDROID_ALARM_GET_TIME(ANDROID_ALARM_ELAPSED_REALTIME), &ts);
if (result == 0) {
int64_t when = seconds_to_nanoseconds(ts.tv_sec) + ts.tv_nsec;
return (int64_t) nanoseconds_to_milliseconds(when);
} else {
// XXX: there was an error, probably because the driver didn't
// exist ... this should return
// a real error, like an exception!
int64_t when = systemTime(SYSTEM_TIME_MONOTONIC);
return (int64_t) nanoseconds_to_milliseconds(when);
}
#else
int64_t when = systemTime(SYSTEM_TIME_MONOTONIC);
return (int64_t) nanoseconds_to_milliseconds(when);
#endif
}
int gralloc_unlock(gralloc_module_t const* module,
buffer_handle_t handle)
{
if (private_handle_t::validate(handle) < 0)
return -EINVAL;
private_handle_t* hnd = (private_handle_t*)handle;
int32_t current_value, new_value;
#ifndef BOARD_NO_CACHED_BUFFERS
if (hnd->flags & private_handle_t::PRIV_FLAGS_NEEDS_FLUSH) {
struct pmem_region region;
int err;
region.offset = hnd->offset;
region.len = hnd->size;
err = ioctl(hnd->fd, PMEM_CACHE_FLUSH, ®ion);
if (err < 0)
{
struct pmem_addr pmem_addr;
pmem_addr.vaddr = hnd->base;
pmem_addr.offset = hnd->offset;
pmem_addr.length = hnd->size;
err = ioctl( hnd->fd, PMEM_CLEAN_CACHES, &pmem_addr);
}
LOGE_IF(err < 0, "cannot flush handle %p (offs=%x len=%x)\n",
hnd, hnd->offset, hnd->size);
hnd->flags &= ~private_handle_t::PRIV_FLAGS_NEEDS_FLUSH;
}
#endif
do {
current_value = hnd->lockState;
new_value = current_value;
if (current_value & private_handle_t::LOCK_STATE_WRITE) {
// locked for write
if (hnd->writeOwner == gettid()) {
hnd->writeOwner = 0;
new_value &= ~private_handle_t::LOCK_STATE_WRITE;
}
}
if ((new_value & private_handle_t::LOCK_STATE_READ_MASK) == 0) {
LOGE("handle %p not locked", handle);
return -EINVAL;
}
new_value--;
} while (android_atomic_cmpxchg(current_value, new_value,
(volatile int32_t*)&hnd->lockState));
return 0;
}
int gralloc_unlock(gralloc_module_t const* module,
buffer_handle_t handle)
{
if (private_handle_t::validate(handle) < 0)
return -EINVAL;
private_handle_t* hnd = (private_handle_t*)handle;
int32_t current_value, new_value;
if (hnd->flags & private_handle_t::PRIV_FLAGS_NEEDS_FLUSH) {
int err;
if (hnd->flags & (private_handle_t::PRIV_FLAGS_USES_PMEM |
private_handle_t::PRIV_FLAGS_USES_PMEM_ADSP)) {
struct pmem_addr pmem_addr;
pmem_addr.vaddr = hnd->base;
pmem_addr.offset = hnd->offset;
pmem_addr.length = hnd->size;
err = ioctl( hnd->fd, PMEM_CLEAN_CACHES, &pmem_addr);
} else if ((hnd->flags & private_handle_t::PRIV_FLAGS_USES_ASHMEM)) {
unsigned long addr = hnd->base + hnd->offset;
err = ioctl(hnd->fd, ASHMEM_CACHE_FLUSH_RANGE, NULL);
}
ALOGE_IF(err < 0, "cannot flush handle %p (offs=%x len=%x, flags = 0x%x) err=%s\n",
hnd, hnd->offset, hnd->size, hnd->flags, strerror(errno));
hnd->flags &= ~private_handle_t::PRIV_FLAGS_NEEDS_FLUSH;
}
do {
current_value = hnd->lockState;
new_value = current_value;
if (current_value & private_handle_t::LOCK_STATE_WRITE) {
// locked for write
if (hnd->writeOwner == gettid()) {
hnd->writeOwner = 0;
new_value &= ~private_handle_t::LOCK_STATE_WRITE;
}
}
if ((new_value & private_handle_t::LOCK_STATE_READ_MASK) == 0) {
ALOGE("handle %p not locked", handle);
return -EINVAL;
}
new_value--;
} while (android_atomic_cmpxchg(current_value, new_value,
(volatile int32_t*)&hnd->lockState));
return 0;
}
/*
* native public static long elapsedRealtimeNano();
*/
int64_t elapsedRealtimeNano()
{
#ifdef HAVE_ANDROID_OS
struct timespec ts;
int result;
int64_t timestamp;
#if DEBUG_TIMESTAMP
static volatile int64_t prevTimestamp;
static volatile int prevMethod;
#endif
static int s_fd = -1;
if (s_fd == -1) {
int fd = open("/dev/alarm", O_RDONLY);
if (android_atomic_cmpxchg(-1, fd, &s_fd)) {
close(fd);
}
}
result = ioctl(s_fd,
ANDROID_ALARM_GET_TIME(ANDROID_ALARM_ELAPSED_REALTIME), &ts);
if (result == 0) {
timestamp = seconds_to_nanoseconds(ts.tv_sec) + ts.tv_nsec;
checkTimeStamps(timestamp, &prevTimestamp, &prevMethod, METHOD_IOCTL);
return timestamp;
}
// /dev/alarm doesn't exist, fallback to CLOCK_BOOTTIME
result = clock_gettime(CLOCK_BOOTTIME, &ts);
if (result == 0) {
timestamp = seconds_to_nanoseconds(ts.tv_sec) + ts.tv_nsec;
checkTimeStamps(timestamp, &prevTimestamp, &prevMethod,
METHOD_CLOCK_GETTIME);
return timestamp;
}
// XXX: there was an error, probably because the driver didn't
// exist ... this should return
// a real error, like an exception!
timestamp = systemTime(SYSTEM_TIME_MONOTONIC);
checkTimeStamps(timestamp, &prevTimestamp, &prevMethod,
METHOD_SYSTEMTIME);
return timestamp;
#else
return systemTime(SYSTEM_TIME_MONOTONIC);
#endif
}
void BBinder::attachObject(
const void* objectID, void* object, void* cleanupCookie,
object_cleanup_func func)
{
Extras* e = mExtras;
if (!e) {
e = new Extras;
if (android_atomic_cmpxchg(0, reinterpret_cast<int32_t>(e),
reinterpret_cast<volatile int32_t*>(&mExtras)) != 0) {
delete e;
e = mExtras;
}
if (e == 0) return; // out of memory
}
AutoMutex _l(e->mLock);
e->mObjects.attach(objectID, object, cleanupCookie, func);
}
int gralloc_unlock(gralloc_module_t const* module,
buffer_handle_t handle)
{
if (private_handle_t::validate(handle) < 0)
return -EINVAL;
private_handle_t* hnd = (private_handle_t*)handle;
int32_t current_value, new_value;
do {
current_value = hnd->lockState;
new_value = current_value;
if (current_value & private_handle_t::LOCK_STATE_WRITE) {
// locked for write
if (hnd->writeOwner == gettid()) {
hnd->writeOwner = 0;
new_value &= ~private_handle_t::LOCK_STATE_WRITE;
}
}
if ((new_value & private_handle_t::LOCK_STATE_READ_MASK) == 0) {
LOGE("handle %p not locked", handle);
return -EINVAL;
}
new_value--;
} while (android_atomic_cmpxchg(current_value, new_value,
(volatile int32_t*)&hnd->lockState));
// If this was locked for a software write, send an ioctl to flush the cache
if ( hnd->swWrite == 1) {
struct pmem_addr pmem_addr;
pmem_addr.vaddr = hnd->base;
pmem_addr.offset = hnd->offset;
pmem_addr.length = hnd->size;
ioctl( hnd->fd, PMEM_CLEAN_CACHES, &pmem_addr);
}
return 0;
}
bool RefBase::weakref_type::attemptIncWeak(const void* id)
{
weakref_impl* const impl = static_cast<weakref_impl*>(this);
int32_t curCount = impl->mWeak;
ALOG_ASSERT(curCount >= 0, "attemptIncWeak called on %p after underflow",
this);
while (curCount > 0) {
if (android_atomic_cmpxchg(curCount, curCount+1, &impl->mWeak) == 0) {
break;
}
curCount = impl->mWeak;
}
if (curCount > 0) {
impl->addWeakRef(id);
}
return curCount > 0;
}
int gralloc_lock(gralloc_module_t const* module,
buffer_handle_t handle, int usage,
int l, int t, int w, int h,
void** vaddr)
{
DEBUG_ENTER();
if (private_handle_t::validate(handle) < 0)
return -EINVAL;
int err = 0;
private_handle_t* hnd = (private_handle_t*)handle;
int32_t current_value, new_value;
int retry;
do {
current_value = hnd->lockState;
new_value = current_value;
if (current_value & private_handle_t::LOCK_STATE_WRITE) {
// already locked for write
LOGE("handle %p already locked for write", handle);
return -EBUSY;
} else if (current_value & private_handle_t::LOCK_STATE_READ_MASK) {
// already locked for read
if (usage & (GRALLOC_USAGE_SW_WRITE_MASK | GRALLOC_USAGE_HW_RENDER)) {
LOGE("handle %p already locked for read", handle);
return -EBUSY;
} else {
// this is not an error
//LOGD("%p already locked for read... count = %d",
// handle, (current_value & ~(1<<31)));
}
}
// not currently locked
if (usage & (GRALLOC_USAGE_SW_WRITE_MASK | GRALLOC_USAGE_HW_RENDER)) {
// locking for write
new_value |= private_handle_t::LOCK_STATE_WRITE;
}
new_value++;
retry = android_atomic_cmpxchg(current_value, new_value,
(volatile int32_t*)&hnd->lockState);
} while (retry);
if (new_value & private_handle_t::LOCK_STATE_WRITE) {
// locking for write, store the tid
hnd->writeOwner = gettid();
}
// if requesting sw write for non-framebuffer handles, flag for
// flushing at unlock
if ((usage & GRALLOC_USAGE_SW_WRITE_MASK) &&
!(hnd->flags & private_handle_t::PRIV_FLAGS_FRAMEBUFFER)) {
hnd->flags |= private_handle_t::PRIV_FLAGS_NEEDS_FLUSH;
}
if (usage & (GRALLOC_USAGE_SW_READ_MASK | GRALLOC_USAGE_SW_WRITE_MASK)) {
if (!(current_value & private_handle_t::LOCK_STATE_MAPPED)) {
// we need to map for real
pthread_mutex_t* const lock = &sMapLock;
pthread_mutex_lock(lock);
if (!(hnd->lockState & private_handle_t::LOCK_STATE_MAPPED)) {
err = gralloc_map(module, handle, vaddr);
if (err == 0) {
android_atomic_or(private_handle_t::LOCK_STATE_MAPPED,
(volatile int32_t*)&(hnd->lockState));
}
}
pthread_mutex_unlock(lock);
}
*vaddr = (void*)hnd->base;
}
DEBUG_LEAVE();
return err;
}
bool RefBase::weakref_type::attemptIncStrong(const void* id)
{
incWeak(id);
weakref_impl* const impl = static_cast<weakref_impl*>(this);
int32_t curCount = impl->mStrong;
ALOG_ASSERT(curCount >= 0,
"attemptIncStrong called on %p after underflow", this);
while (curCount > 0 && curCount != INITIAL_STRONG_VALUE) {
// we're in the easy/common case of promoting a weak-reference
// from an existing strong reference.
if (android_atomic_cmpxchg(curCount, curCount+1, &impl->mStrong) == 0) {
break;
}
// the strong count has changed on us, we need to re-assert our
// situation.
curCount = impl->mStrong;
}
if (curCount <= 0 || curCount == INITIAL_STRONG_VALUE) {
// we're now in the harder case of either:
// - there never was a strong reference on us
// - or, all strong references have been released
if ((impl->mFlags&OBJECT_LIFETIME_WEAK) == OBJECT_LIFETIME_STRONG) {
// this object has a "normal" life-time, i.e.: it gets destroyed
// when the last strong reference goes away
if (curCount <= 0) {
// the last strong-reference got released, the object cannot
// be revived.
decWeak(id);
return false;
}
// here, curCount == INITIAL_STRONG_VALUE, which means
// there never was a strong-reference, so we can try to
// promote this object; we need to do that atomically.
while (curCount > 0) {
if (android_atomic_cmpxchg(curCount, curCount + 1,
&impl->mStrong) == 0) {
break;
}
// the strong count has changed on us, we need to re-assert our
// situation (e.g.: another thread has inc/decStrong'ed us)
curCount = impl->mStrong;
}
if (curCount <= 0) {
// promote() failed, some other thread destroyed us in the
// meantime (i.e.: strong count reached zero).
decWeak(id);
return false;
}
} else {
// this object has an "extended" life-time, i.e.: it can be
// revived from a weak-reference only.
// Ask the object's implementation if it agrees to be revived
if (!impl->mBase->onIncStrongAttempted(FIRST_INC_STRONG, id)) {
// it didn't so give-up.
decWeak(id);
return false;
}
// grab a strong-reference, which is always safe due to the
// extended life-time.
curCount = android_atomic_inc(&impl->mStrong);
}
// If the strong reference count has already been incremented by
// someone else, the implementor of onIncStrongAttempted() is holding
// an unneeded reference. So call onLastStrongRef() here to remove it.
// (No, this is not pretty.) Note that we MUST NOT do this if we
// are in fact acquiring the first reference.
if (curCount > 0 && curCount < INITIAL_STRONG_VALUE) {
impl->mBase->onLastStrongRef(id);
}
}
impl->addStrongRef(id);
#if PRINT_REFS
ALOGD("attemptIncStrong of %p from %p: cnt=%d\n", this, id, curCount);
#endif
// now we need to fix-up the count if it was INITIAL_STRONG_VALUE
// this must be done safely, i.e.: handle the case where several threads
// were here in attemptIncStrong().
curCount = impl->mStrong;
while (curCount >= INITIAL_STRONG_VALUE) {
ALOG_ASSERT(curCount > INITIAL_STRONG_VALUE,
"attemptIncStrong in %p underflowed to INITIAL_STRONG_VALUE",
this);
if (android_atomic_cmpxchg(curCount, curCount-INITIAL_STRONG_VALUE,
&impl->mStrong) == 0) {
break;
}
// the strong-count changed on us, we need to re-assert the situation,
// for e.g.: it's possible the fix-up happened in another thread.
curCount = impl->mStrong;
}
return true;
}
bool RefBase::weakref_type::attemptIncStrong(const void* id)
{
incWeak(id);
weakref_impl* const impl = static_cast<weakref_impl*>(this);
int32_t curCount = impl->mStrong;
ALOG_ASSERT(curCount >= 0, "attemptIncStrong called on %p after underflow",
this);
while (curCount > 0 && curCount != INITIAL_STRONG_VALUE) {
if (android_atomic_cmpxchg(curCount, curCount+1, &impl->mStrong) == 0) {
break;
}
curCount = impl->mStrong;
}
if (curCount <= 0 || curCount == INITIAL_STRONG_VALUE) {
bool allow;
if (curCount == INITIAL_STRONG_VALUE) {
// Attempting to acquire first strong reference... this is allowed
// if the object does NOT have a longer lifetime (meaning the
// implementation doesn't need to see this), or if the implementation
// allows it to happen.
allow = (impl->mFlags&OBJECT_LIFETIME_WEAK) != OBJECT_LIFETIME_WEAK
|| impl->mBase->onIncStrongAttempted(FIRST_INC_STRONG, id);
} else {
// Attempting to revive the object... this is allowed
// if the object DOES have a longer lifetime (so we can safely
// call the object with only a weak ref) and the implementation
// allows it to happen.
allow = (impl->mFlags&OBJECT_LIFETIME_WEAK) == OBJECT_LIFETIME_WEAK
&& impl->mBase->onIncStrongAttempted(FIRST_INC_STRONG, id);
}
if (!allow) {
decWeak(id);
return false;
}
curCount = android_atomic_inc(&impl->mStrong);
// If the strong reference count has already been incremented by
// someone else, the implementor of onIncStrongAttempted() is holding
// an unneeded reference. So call onLastStrongRef() here to remove it.
// (No, this is not pretty.) Note that we MUST NOT do this if we
// are in fact acquiring the first reference.
if (curCount > 0 && curCount < INITIAL_STRONG_VALUE) {
impl->mBase->onLastStrongRef(id);
}
}
impl->addStrongRef(id);
#if PRINT_REFS
ALOGD("attemptIncStrong of %p from %p: cnt=%d\n", this, id, curCount);
#endif
if (curCount == INITIAL_STRONG_VALUE) {
android_atomic_add(-INITIAL_STRONG_VALUE, &impl->mStrong);
impl->mBase->onFirstRef();
}
return true;
}
int gralloc_lock_pmem(gralloc_module_t const* module,
struct hwmem_gralloc_buf_handle_t* hnd, int usage,
int l, int t, int w, int h,
void** vaddr)
{
int err = 0;
int32_t current_value, new_value;
int retry;
do {
current_value = hnd->lockState;
new_value = current_value;
if (current_value & LOCK_STATE_WRITE) {
// already locked for write
ALOGE("handle %p already locked for write", hnd);
return -EBUSY;
} else if (current_value & LOCK_STATE_READ_MASK) {
// already locked for read
if (usage & (GRALLOC_USAGE_SW_WRITE_MASK | GRALLOC_USAGE_HW_RENDER)) {
ALOGE("handle %p already locked for read", hnd);
return -EBUSY;
} else {
// this is not an error
//ALOGD("%p already locked for read... count = %d",
// hnd, (current_value & ~(1<<31)));
}
}
// not currently locked
if (usage & (GRALLOC_USAGE_SW_WRITE_MASK | GRALLOC_USAGE_HW_RENDER)) {
// locking for write
new_value |= LOCK_STATE_WRITE;
}
new_value++;
retry = android_atomic_cmpxchg(current_value, new_value,
(volatile int32_t*)&hnd->lockState);
} while (retry);
if (new_value & LOCK_STATE_WRITE) {
// locking for write, store the tid
hnd->writeOwner = gettid();
}
if (usage & (GRALLOC_USAGE_SW_READ_MASK | GRALLOC_USAGE_SW_WRITE_MASK)) {
if (!(current_value & LOCK_STATE_MAPPED)) {
// we need to map for real
pthread_mutex_t* const lock = &sMapLock;
pthread_mutex_lock(lock);
if (!(hnd->lockState & LOCK_STATE_MAPPED)) {
err = gralloc_map(module, hnd, vaddr);
if (err == 0) {
android_atomic_or(LOCK_STATE_MAPPED,
(volatile int32_t*)&(hnd->lockState));
}
}
pthread_mutex_unlock(lock);
}
*vaddr = (void*)hnd->base_addr;
}
return err;
}
int OSAtomicCompareAndSwapInt(int oldValue,int newValue,volatile int* target) {
return !android_atomic_cmpxchg(oldValue,newValue,target);
}
int gralloc_lock(gralloc_module_t const* module,
buffer_handle_t handle, int usage,
int l, int t, int w, int h,
void** vaddr)
{
gralloc_module_t const* gralloc_viv = gralloc_get(module, handle);
if(gralloc_viv){
return gralloc_viv->lock(gralloc_viv, handle, usage, l, t, w, h, vaddr);
}
if (private_handle_t::validate(handle) < 0)
return -EINVAL;
int err = 0;
private_handle_t* hnd = (private_handle_t*)handle;
int32_t current_value, new_value;
int retry;
do {
current_value = hnd->lockState;
new_value = current_value;
if (current_value & private_handle_t::LOCK_STATE_WRITE) {
// already locked for write
LOGE("handle %p already locked for write", handle);
return -EBUSY;
} else if (current_value & private_handle_t::LOCK_STATE_READ_MASK) {
// already locked for read
if (usage & (GRALLOC_USAGE_SW_WRITE_MASK | GRALLOC_USAGE_HW_RENDER)) {
LOGE("handle %p already locked for read", handle);
return -EBUSY;
} else {
// this is not an error
//LOGD("%p already locked for read... count = %d",
// handle, (current_value & ~(1<<31)));
}
}
// not currently locked
if (usage & (GRALLOC_USAGE_SW_WRITE_MASK | GRALLOC_USAGE_HW_RENDER)) {
// locking for write
new_value |= private_handle_t::LOCK_STATE_WRITE;
}
new_value++;
retry = android_atomic_cmpxchg(current_value, new_value,
(volatile int32_t*)&hnd->lockState);
} while (retry);
if (new_value & private_handle_t::LOCK_STATE_WRITE) {
// locking for write, store the tid
hnd->writeOwner = getpid();
}
if (usage & (GRALLOC_USAGE_SW_READ_MASK | GRALLOC_USAGE_SW_WRITE_MASK)) {
if (!(current_value & private_handle_t::LOCK_STATE_MAPPED)) {
// we need to map for real
pthread_mutex_t* const lock = &sMapLock;
pthread_mutex_lock(lock);
if (!(hnd->lockState & private_handle_t::LOCK_STATE_MAPPED)) {
err = gralloc_map(module, handle, vaddr);
if (err == 0) {
android_atomic_or(private_handle_t::LOCK_STATE_MAPPED,
(volatile int32_t*)&(hnd->lockState));
}
}
pthread_mutex_unlock(lock);
}
*vaddr = (void*)hnd->base;
}
return err;
}
