shinano-common: libshim_camera: Update GraphicBuffer sources to Pie

* Copy from Pie framework sources.

Change-Id: I903eb0c3c80a752d4a8da44dec47e348c7dd23fc
Signed-off-by: Nikhil Punathil <nikhilpe@gmail.com>

2 files changed, 194 insertions, 101 deletions

diff --git a/libshims/utils/Looper.cpp b/libshims/utils/Looper.cpp
index 4bab6d5..6c57b2e 100644
--- a/libshims/utils/Looper.cpp
+++ b/libshims/utils/Looper.cpp
@@ -13,14 +13,8 @@
 // Debugs callback registration and invocation.
 #define DEBUG_CALLBACKS 0
 
-#include <cutils/log.h>
 #include <utils/Looper.h>
-#include <utils/Timers.h>
-
-#include <unistd.h>
-#include <fcntl.h>
-#include <limits.h>
-
+#include <sys/eventfd.h>
 
 namespace android {
 
@@ -68,41 +62,22 @@ static pthread_key_t gTLSKey = 0;
 
 Looper::Looper(bool allowNonCallbacks) :
         mAllowNonCallbacks(allowNonCallbacks), mSendingMessage(false),
-        mResponseIndex(0), mNextMessageUptime(LLONG_MAX) {
-    int wakeFds[2];
-    int result = pipe(wakeFds);
-    LOG_ALWAYS_FATAL_IF(result != 0, "Could not create wake pipe.  errno=%d", errno);
-
-    mWakeReadPipeFd = wakeFds[0];
-    mWakeWritePipeFd = wakeFds[1];
-
-    result = fcntl(mWakeReadPipeFd, F_SETFL, O_NONBLOCK);
-    LOG_ALWAYS_FATAL_IF(result != 0, "Could not make wake read pipe non-blocking.  errno=%d",
-            errno);
-
-    result = fcntl(mWakeWritePipeFd, F_SETFL, O_NONBLOCK);
-    LOG_ALWAYS_FATAL_IF(result != 0, "Could not make wake write pipe non-blocking.  errno=%d",
-            errno);
-
-    mPolling = false;
-
-    // Allocate the epoll instance and register the wake pipe.
-    mEpollFd = epoll_create(EPOLL_SIZE_HINT);
-    LOG_ALWAYS_FATAL_IF(mEpollFd < 0, "Could not create epoll instance.  errno=%d", errno);
-
-    struct epoll_event eventItem;
-    memset(& eventItem, 0, sizeof(epoll_event)); // zero out unused members of data field union
-    eventItem.events = EPOLLIN;
-    eventItem.data.fd = mWakeReadPipeFd;
-    result = epoll_ctl(mEpollFd, EPOLL_CTL_ADD, mWakeReadPipeFd, & eventItem);
-    LOG_ALWAYS_FATAL_IF(result != 0, "Could not add wake read pipe to epoll instance.  errno=%d",
-            errno);
+        mPolling(false), mEpollFd(-1), mEpollRebuildRequired(false),
+        mNextRequestSeq(0), mResponseIndex(0), mNextMessageUptime(LLONG_MAX) {
+    mWakeEventFd = eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC);
+    LOG_ALWAYS_FATAL_IF(mWakeEventFd < 0, "Could not make wake event fd: %s",
+                        strerror(errno));
+
+    AutoMutex _l(mLock);
+    rebuildEpollLocked();
 }
 
 Looper::~Looper() {
-    close(mWakeReadPipeFd);
-    close(mWakeWritePipeFd);
-    close(mEpollFd);
+    close(mWakeEventFd);
+    mWakeEventFd = -1;
+    if (mEpollFd >= 0) {
+        close(mEpollFd);
+    }
 }
 
 void Looper::initTLSKey() {
@@ -156,6 +131,50 @@ bool Looper::getAllowNonCallbacks() const {
     return mAllowNonCallbacks;
 }
 
+void Looper::rebuildEpollLocked() {
+    // Close old epoll instance if we have one.
+    if (mEpollFd >= 0) {
+#if DEBUG_CALLBACKS
+        ALOGD("%p ~ rebuildEpollLocked - rebuilding epoll set", this);
+#endif
+        close(mEpollFd);
+    }
+
+    // Allocate the new epoll instance and register the wake pipe.
+    mEpollFd = epoll_create(EPOLL_SIZE_HINT);
+    LOG_ALWAYS_FATAL_IF(mEpollFd < 0, "Could not create epoll instance: %s", strerror(errno));
+
+    struct epoll_event eventItem;
+    memset(& eventItem, 0, sizeof(epoll_event)); // zero out unused members of data field union
+    eventItem.events = EPOLLIN;
+    eventItem.data.fd = mWakeEventFd;
+    int result = epoll_ctl(mEpollFd, EPOLL_CTL_ADD, mWakeEventFd, & eventItem);
+    LOG_ALWAYS_FATAL_IF(result != 0, "Could not add wake event fd to epoll instance: %s",
+                        strerror(errno));
+
+    for (size_t i = 0; i < mRequests.size(); i++) {
+        const Request& request = mRequests.valueAt(i);
+        struct epoll_event eventItem;
+        request.initEventItem(&eventItem);
+
+        int epollResult = epoll_ctl(mEpollFd, EPOLL_CTL_ADD, request.fd, & eventItem);
+        if (epollResult < 0) {
+            ALOGE("Error adding epoll events for fd %d while rebuilding epoll set: %s",
+                  request.fd, strerror(errno));
+        }
+    }
+}
+
+void Looper::scheduleEpollRebuildLocked() {
+    if (!mEpollRebuildRequired) {
+#if DEBUG_CALLBACKS
+        ALOGD("%p ~ scheduleEpollRebuildLocked - scheduling epoll set rebuild", this);
+#endif
+        mEpollRebuildRequired = true;
+        wake();
+    }
+}
+
 int Looper::pollOnce(int timeoutMillis, int* outFd, int* outEvents, void** outData) {
     int result = 0;
     for (;;) {
@@ -206,7 +225,7 @@ int Looper::pollInner(int timeoutMillis) {
             timeoutMillis = messageTimeoutMillis;
         }
 #if DEBUG_POLL_AND_WAKE
-        ALOGD("%p ~ pollOnce - next message in %lldns, adjusted timeout: timeoutMillis=%d",
+        ALOGD("%p ~ pollOnce - next message in %" PRId64 "ns, adjusted timeout: timeoutMillis=%d",
                 this, mNextMessageUptime - now, timeoutMillis);
 #endif
     }
@@ -228,12 +247,19 @@ int Looper::pollInner(int timeoutMillis) {
     // Acquire lock.
     mLock.lock();
 
+    // Rebuild epoll set if needed.
+    if (mEpollRebuildRequired) {
+        mEpollRebuildRequired = false;
+        rebuildEpollLocked();
+        goto Done;
+    }
+
     // Check for poll error.
     if (eventCount < 0) {
         if (errno == EINTR) {
             goto Done;
         }
-        ALOGW("Poll failed with an unexpected error, errno=%d", errno);
+        ALOGW("Poll failed with an unexpected error: %s", strerror(errno));
         result = POLL_ERROR;
         goto Done;
     }
@@ -255,11 +281,11 @@ int Looper::pollInner(int timeoutMillis) {
     for (int i = 0; i < eventCount; i++) {
         int fd = eventItems[i].data.fd;
         uint32_t epollEvents = eventItems[i].events;
-        if (fd == mWakeReadPipeFd) {
+        if (fd == mWakeEventFd) {
             if (epollEvents & EPOLLIN) {
                 awoken();
             } else {
-                ALOGW("Ignoring unexpected epoll events 0x%x on wake read pipe.", epollEvents);
+                ALOGW("Ignoring unexpected epoll events 0x%x on wake event fd.", epollEvents);
             }
         } else {
             ssize_t requestIndex = mRequests.indexOfKey(fd);
@@ -326,10 +352,14 @@ Done: ;
             ALOGD("%p ~ pollOnce - invoking fd event callback %p: fd=%d, events=0x%x, data=%p",
                     this, response.request.callback.get(), fd, events, data);
 #endif
+            // Invoke the callback.  Note that the file descriptor may be closed by
+            // the callback (and potentially even reused) before the function returns so
+            // we need to be a little careful when removing the file descriptor afterwards.
             int callbackResult = response.request.callback->handleEvent(fd, events, data);
             if (callbackResult == 0) {
-                removeFd(fd);
+                removeFd(fd, response.request.seq);
             }
+
             // Clear the callback reference in the response structure promptly because we
             // will not clear the response vector itself until the next poll.
             response.request.callback.clear();
@@ -370,14 +400,12 @@ void Looper::wake() {
     ALOGD("%p ~ wake", this);
 #endif
 
-    ssize_t nWrite;
-    do {
-        nWrite = write(mWakeWritePipeFd, "W", 1);
-    } while (nWrite == -1 && errno == EINTR);
-
-    if (nWrite != 1) {
+    uint64_t inc = 1;
+    ssize_t nWrite = TEMP_FAILURE_RETRY(write(mWakeEventFd, &inc, sizeof(uint64_t)));
+    if (nWrite != sizeof(uint64_t)) {
         if (errno != EAGAIN) {
-            ALOGW("Could not write wake signal, errno=%d", errno);
+            LOG_ALWAYS_FATAL("Could not write wake signal to fd %d: %s",
+                    mWakeEventFd, strerror(errno));
         }
     }
 }
@@ -387,11 +415,8 @@ void Looper::awoken() {
     ALOGD("%p ~ awoken", this);
 #endif
 
-    char buffer[16];
-    ssize_t nRead;
-    do {
-        nRead = read(mWakeReadPipeFd, buffer, sizeof(buffer));
-    } while ((nRead == -1 && errno == EINTR) || nRead == sizeof(buffer));
+    uint64_t counter;
+    TEMP_FAILURE_RETRY(read(mWakeEventFd, &counter, sizeof(uint64_t)));
 }
 
 void Looper::pushResponse(int events, const Request& request) {
@@ -425,37 +450,62 @@ int Looper::addFd(int fd, int ident, int events, const sp<LooperCallback>& callb
         ident = POLL_CALLBACK;
     }
 
-    int epollEvents = 0;
-    if (events & EVENT_INPUT) epollEvents |= EPOLLIN;
-    if (events & EVENT_OUTPUT) epollEvents |= EPOLLOUT;
-
     { // acquire lock
         AutoMutex _l(mLock);
 
         Request request;
         request.fd = fd;
         request.ident = ident;
+        request.events = events;
+        request.seq = mNextRequestSeq++;
         request.callback = callback;
         request.data = data;
+        if (mNextRequestSeq == -1) mNextRequestSeq = 0; // reserve sequence number -1
 
         struct epoll_event eventItem;
-        memset(& eventItem, 0, sizeof(epoll_event)); // zero out unused members of data field union
-        eventItem.events = epollEvents;
-        eventItem.data.fd = fd;
+        request.initEventItem(&eventItem);
 
         ssize_t requestIndex = mRequests.indexOfKey(fd);
         if (requestIndex < 0) {
             int epollResult = epoll_ctl(mEpollFd, EPOLL_CTL_ADD, fd, & eventItem);
             if (epollResult < 0) {
-                ALOGE("Error adding epoll events for fd %d, errno=%d", fd, errno);
+                ALOGE("Error adding epoll events for fd %d: %s", fd, strerror(errno));
                 return -1;
             }
             mRequests.add(fd, request);
         } else {
             int epollResult = epoll_ctl(mEpollFd, EPOLL_CTL_MOD, fd, & eventItem);
             if (epollResult < 0) {
-                ALOGE("Error modifying epoll events for fd %d, errno=%d", fd, errno);
-                return -1;
+                if (errno == ENOENT) {
+                    // Tolerate ENOENT because it means that an older file descriptor was
+                    // closed before its callback was unregistered and meanwhile a new
+                    // file descriptor with the same number has been created and is now
+                    // being registered for the first time.  This error may occur naturally
+                    // when a callback has the side-effect of closing the file descriptor
+                    // before returning and unregistering itself.  Callback sequence number
+                    // checks further ensure that the race is benign.
+                    //
+                    // Unfortunately due to kernel limitations we need to rebuild the epoll
+                    // set from scratch because it may contain an old file handle that we are
+                    // now unable to remove since its file descriptor is no longer valid.
+                    // No such problem would have occurred if we were using the poll system
+                    // call instead, but that approach carries others disadvantages.
+#if DEBUG_CALLBACKS
+                    ALOGD("%p ~ addFd - EPOLL_CTL_MOD failed due to file descriptor "
+                            "being recycled, falling back on EPOLL_CTL_ADD: %s",
+                            this, strerror(errno));
+#endif
+                    epollResult = epoll_ctl(mEpollFd, EPOLL_CTL_ADD, fd, & eventItem);
+                    if (epollResult < 0) {
+                        ALOGE("Error modifying or adding epoll events for fd %d: %s",
+                                fd, strerror(errno));
+                        return -1;
+                    }
+                    scheduleEpollRebuildLocked();
+                } else {
+                    ALOGE("Error modifying epoll events for fd %d: %s", fd, strerror(errno));
+                    return -1;
+                }
             }
             mRequests.replaceValueAt(requestIndex, request);
         }
@@ -464,8 +514,12 @@ int Looper::addFd(int fd, int ident, int events, const sp<LooperCallback>& callb
 }
 
 int Looper::removeFd(int fd) {
+    return removeFd(fd, -1);
+}
+
+int Looper::removeFd(int fd, int seq) {
 #if DEBUG_CALLBACKS
-    ALOGD("%p ~ removeFd - fd=%d", this, fd);
+    ALOGD("%p ~ removeFd - fd=%d, seq=%d", this, fd, seq);
 #endif
 
     { // acquire lock
@@ -475,13 +529,48 @@ int Looper::removeFd(int fd) {
             return 0;
         }
 
-        int epollResult = epoll_ctl(mEpollFd, EPOLL_CTL_DEL, fd, NULL);
-        if (epollResult < 0) {
-            ALOGE("Error removing epoll events for fd %d, errno=%d", fd, errno);
-            return -1;
+        // Check the sequence number if one was given.
+        if (seq != -1 && mRequests.valueAt(requestIndex).seq != seq) {
+#if DEBUG_CALLBACKS
+            ALOGD("%p ~ removeFd - sequence number mismatch, oldSeq=%d",
+                    this, mRequests.valueAt(requestIndex).seq);
+#endif
+            return 0;
         }
 
+        // Always remove the FD from the request map even if an error occurs while
+        // updating the epoll set so that we avoid accidentally leaking callbacks.
         mRequests.removeItemsAt(requestIndex);
+
+        int epollResult = epoll_ctl(mEpollFd, EPOLL_CTL_DEL, fd, NULL);
+        if (epollResult < 0) {
+            if (seq != -1 && (errno == EBADF || errno == ENOENT)) {
+                // Tolerate EBADF or ENOENT when the sequence number is known because it
+                // means that the file descriptor was closed before its callback was
+                // unregistered.  This error may occur naturally when a callback has the
+                // side-effect of closing the file descriptor before returning and
+                // unregistering itself.
+                //
+                // Unfortunately due to kernel limitations we need to rebuild the epoll
+                // set from scratch because it may contain an old file handle that we are
+                // now unable to remove since its file descriptor is no longer valid.
+                // No such problem would have occurred if we were using the poll system
+                // call instead, but that approach carries others disadvantages.
+#if DEBUG_CALLBACKS
+                ALOGD("%p ~ removeFd - EPOLL_CTL_DEL failed due to file descriptor "
+                        "being closed: %s", this, strerror(errno));
+#endif
+                scheduleEpollRebuildLocked();
+            } else {
+                // Some other error occurred.  This is really weird because it means
+                // our list of callbacks got out of sync with the epoll set somehow.
+                // We defensively rebuild the epoll set to avoid getting spurious
+                // notifications with nowhere to go.
+                ALOGE("Error removing epoll events for fd %d: %s", fd, strerror(errno));
+                scheduleEpollRebuildLocked();
+                return -1;
+            }
+        }
     } // release lock
     return 1;
 }
@@ -500,7 +589,7 @@ void Looper::sendMessageDelayed(nsecs_t uptimeDelay, const sp<MessageHandler>& h
 void Looper::sendMessageAtTime(nsecs_t uptime, const sp<MessageHandler>& handler,
         const Message& message) {
 #if DEBUG_CALLBACKS
-    ALOGD("%p ~ sendMessageAtTime - uptime=%lld, handler=%p, what=%d",
+    ALOGD("%p ~ sendMessageAtTime - uptime=%" PRId64 ", handler=%p, what=%d",
             this, uptime, handler.get(), message.what);
 #endif
 
@@ -570,4 +659,18 @@ bool Looper::isPolling() const {
     return mPolling;
 }
 
-} // namespace android
\ No newline at end of file
+void Looper::Request::initEventItem(struct epoll_event* eventItem) const {
+    int epollEvents = 0;
+    if (events & EVENT_INPUT) epollEvents |= EPOLLIN;
+    if (events & EVENT_OUTPUT) epollEvents |= EPOLLOUT;
+
+    memset(eventItem, 0, sizeof(epoll_event)); // zero out unused members of data field union
+    eventItem->events = epollEvents;
+    eventItem->data.fd = fd;
+}
+
+MessageHandler::~MessageHandler() { }
+
+LooperCallback::~LooperCallback() { }
+
+} // namespace android
diff --git a/libshims/utils/VectorImpl.cpp b/libshims/utils/VectorImpl.cpp
index 936cd37..ef3277f 100644
--- a/libshims/utils/VectorImpl.cpp
+++ b/libshims/utils/VectorImpl.cpp
@@ -16,16 +16,17 @@
 
 #define LOG_TAG "Vector"
 
-#include <string.h>
-#include <stdlib.h>
+#include <utils/VectorImpl.h>
+
 #include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
 
 #include <log/log.h>
+
 #include <safe_iop.h>
 
-#include <SharedBuffer.h>
-#include <utils/Errors.h>
-#include <utils/VectorImpl.h>
+#include "SharedBuffer.h"
 
 /*****************************************************************************/
 
@@ -62,7 +63,7 @@ VectorImpl::~VectorImpl()
         "[%p] subclasses of VectorImpl must call finish_vector()"
         " in their destructor. Leaking %d bytes.",
         this, (int)(mCount*mItemSize));
-    // We can't call _do_destroy() here because the vtable is already gone.
+    // We can't call _do_destroy() here because the vtable is already gone. 
 }
 
 VectorImpl& VectorImpl::operator = (const VectorImpl& rhs)
@@ -198,13 +199,16 @@ status_t VectorImpl::sort(VectorImpl::compar_r_t cmp, void* state)
                 _do_copy(temp, item, 1);
 
                 ssize_t j = i-1;
-                void* next = reinterpret_cast<char*>(array) + mItemSize*(i);
+                void* next = reinterpret_cast<char*>(array) + mItemSize*(i);                    
                 do {
                     _do_destroy(next, 1);
                     _do_copy(next, curr, 1);
                     next = curr;
                     --j;
-                    curr = reinterpret_cast<char*>(array) + mItemSize*(j);
+                    curr = NULL;
+                    if (j >= 0) {
+                        curr = reinterpret_cast<char*>(array) + mItemSize*(j);
+                    }
                 } while (j>=0 && (cmp(curr, temp, state) > 0));
 
                 _do_destroy(next, 1);
@@ -212,7 +216,7 @@ status_t VectorImpl::sort(VectorImpl::compar_r_t cmp, void* state)
             }
             i++;
         }
-
+        
         if (temp) {
             _do_destroy(temp, 1);
             free(temp);
@@ -368,7 +372,7 @@ void VectorImpl::release_storage()
         if (sb->release(SharedBuffer::eKeepStorage) == 1) {
             _do_destroy(mStorage, mCount);
             SharedBuffer::dealloc(sb);
-        }
+        } 
     }
 }
 
@@ -552,15 +556,6 @@ void VectorImpl::_do_move_backward(void* dest, const void* from, size_t num) con
     do_move_backward(dest, from, num);
 }
 
-void VectorImpl::reservedVectorImpl1() { }
-void VectorImpl::reservedVectorImpl2() { }
-void VectorImpl::reservedVectorImpl3() { }
-void VectorImpl::reservedVectorImpl4() { }
-void VectorImpl::reservedVectorImpl5() { }
-void VectorImpl::reservedVectorImpl6() { }
-void VectorImpl::reservedVectorImpl7() { }
-void VectorImpl::reservedVectorImpl8() { }
-
 /*****************************************************************************/
 
 SortedVectorImpl::SortedVectorImpl(size_t itemSize, uint32_t flags)
@@ -596,6 +591,10 @@ size_t SortedVectorImpl::orderOf(const void* item) const
 
 ssize_t SortedVectorImpl::_indexOrderOf(const void* item, size_t* order) const
 {
+    if (order) *order = 0;
+    if (isEmpty()) {
+        return NAME_NOT_FOUND;
+    }
     // binary search
     ssize_t err = NAME_NOT_FOUND;
     ssize_t l = 0;
@@ -676,15 +675,6 @@ ssize_t SortedVectorImpl::remove(const void* item)
     return i;
 }
 
-void SortedVectorImpl::reservedSortedVectorImpl1() { };
-void SortedVectorImpl::reservedSortedVectorImpl2() { };
-void SortedVectorImpl::reservedSortedVectorImpl3() { };
-void SortedVectorImpl::reservedSortedVectorImpl4() { };
-void SortedVectorImpl::reservedSortedVectorImpl5() { };
-void SortedVectorImpl::reservedSortedVectorImpl6() { };
-void SortedVectorImpl::reservedSortedVectorImpl7() { };
-void SortedVectorImpl::reservedSortedVectorImpl8() { };
-
 /*****************************************************************************/
 
 }; // namespace android