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Bug 1133939 P1 Free buffer resources when an nsPipeInputStream is closed. r=froydnj

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This commit is contained in:
Ben Kelly 2015-02-20 18:16:04 -05:00
parent 4a4a64d7ec
commit 1bbac510fd
1 changed files with 120 additions and 71 deletions
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191
xpcom/io/nsPipe3.cpp
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@ -54,6 +54,22 @@ class nsPipeEvents;
class nsPipeInputStream;
class nsPipeOutputStream;
namespace {
enum MonitorAction
{
DoNotNotifyMonitor,
NotifyMonitor
};
enum SegmentChangeResult
{
SegmentNotChanged,
SegmentDeleted
};
} // anonymous namespace
//-----------------------------------------------------------------------------
// this class is used to delay notifications until the end of a particular
@ -160,10 +176,8 @@ public:
// synchronously wait for the pipe to become readable.
nsresult Wait();
// these functions return true to indicate that the pipe's monitor should
// be notified, to wake up a blocked reader if any.
bool OnInputReadable(uint32_t aBytesWritten, nsPipeEvents&);
bool OnInputException(nsresult, nsPipeEvents&);
MonitorAction OnInputReadable(uint32_t aBytesWritten, nsPipeEvents&);
MonitorAction OnInputException(nsresult, nsPipeEvents&);
nsPipeReadState& ReadState()
{
@ -239,10 +253,8 @@ public:
// synchronously wait for the pipe to become writable.
nsresult Wait();
// these functions return true to indicate that the pipe's monitor should
// be notified, to wake up a blocked writer if any.
bool OnOutputWritable(nsPipeEvents&);
bool OnOutputException(nsresult, nsPipeEvents&);
MonitorAction OnOutputWritable(nsPipeEvents&);
MonitorAction OnOutputException(nsresult, nsPipeEvents&);
private:
nsPipe* mPipe;
@ -292,6 +304,9 @@ public:
const char*& aSegment, uint32_t& aSegmentLen);
void AdvanceReadCursor(nsPipeReadState& aReadState, uint32_t aCount,
uint32_t* aAvailableOut);
SegmentChangeResult AdvanceReadSegment(nsPipeReadState& aReadState);
void DrainInputStream(nsPipeReadState& aReadState, nsPipeEvents& aEvents,
uint32_t* aAvailableOut);
nsresult GetWriteSegment(char*& aSegment, uint32_t& aSegmentLen);
void AdvanceWriteCursor(uint32_t aCount);
@ -545,55 +560,89 @@ nsPipe::AdvanceReadCursor(nsPipeReadState& aReadState, uint32_t aBytesRead,
return;
}
uint32_t currentSegment = aReadState.mSegment;
// Move to the next segment to read
aReadState.mSegment += 1;
// If this was the last reference to the first segment, then remove it.
if (currentSegment == 0 && CountSegmentReferences(currentSegment) == 0) {
// shift write and read segment index (-1 indicates an empty buffer).
mWriteSegment -= 1;
for (uint32_t i = 0; i < mInputList.Length(); ++i) {
mInputList[i]->ReadState().mSegment -= 1;
}
// done with this segment
mBuffer.DeleteFirstSegment();
LOG(("III deleting first segment\n"));
}
if (mWriteSegment < aReadState.mSegment) {
// read cursor has hit the end of written data, so reset it
MOZ_ASSERT(mWriteSegment == (aReadState.mSegment - 1));
aReadState.mReadCursor = nullptr;
aReadState.mReadLimit = nullptr;
// also, the buffer is completely empty, so reset the write cursor
if (mWriteSegment == -1) {
mWriteCursor = nullptr;
mWriteLimit = nullptr;
}
} else {
// advance read cursor and limit to next buffer segment
aReadState.mReadCursor = mBuffer.GetSegment(aReadState.mSegment);
if (mWriteSegment == aReadState.mSegment) {
aReadState.mReadLimit = mWriteCursor;
} else {
aReadState.mReadLimit = aReadState.mReadCursor + mBuffer.GetSegmentSize();
}
}
// we've free'd up a segment, so notify output stream that pipe has
// room for a new segment.
if (mOutput.OnOutputWritable(events)) {
mon.Notify();
// Check to see if we can free up any segments. If we can, then notify
// the output stream that the pipe has room for a new segment.
if (AdvanceReadSegment(aReadState) == SegmentDeleted &&
mOutput.OnOutputWritable(events) == NotifyMonitor) {
mon.NotifyAll();
}
}
}
}
SegmentChangeResult
nsPipe::AdvanceReadSegment(nsPipeReadState& aReadState)
{
uint32_t currentSegment = aReadState.mSegment;
// Move to the next segment to read
aReadState.mSegment += 1;
SegmentChangeResult result = SegmentNotChanged;
// If this was the last reference to the first segment, then remove it.
if (currentSegment == 0 && CountSegmentReferences(currentSegment) == 0) {
// shift write and read segment index (-1 indicates an empty buffer).
mWriteSegment -= 1;
for (uint32_t i = 0; i < mInputList.Length(); ++i) {
mInputList[i]->ReadState().mSegment -= 1;
}
// done with this segment
mBuffer.DeleteFirstSegment();
LOG(("III deleting first segment\n"));
result = SegmentDeleted;
}
if (mWriteSegment < aReadState.mSegment) {
// read cursor has hit the end of written data, so reset it
MOZ_ASSERT(mWriteSegment == (aReadState.mSegment - 1));
aReadState.mReadCursor = nullptr;
aReadState.mReadLimit = nullptr;
// also, the buffer is completely empty, so reset the write cursor
if (mWriteSegment == -1) {
mWriteCursor = nullptr;
mWriteLimit = nullptr;
}
} else {
// advance read cursor and limit to next buffer segment
aReadState.mReadCursor = mBuffer.GetSegment(aReadState.mSegment);
if (mWriteSegment == aReadState.mSegment) {
aReadState.mReadLimit = mWriteCursor;
} else {
aReadState.mReadLimit = aReadState.mReadCursor + mBuffer.GetSegmentSize();
}
}
return result;
}
void
nsPipe::DrainInputStream(nsPipeReadState& aReadState, nsPipeEvents& aEvents,
uint32_t* aAvailableOut)
{
ReentrantMonitorAutoEnter mon(mReentrantMonitor);
*aAvailableOut = 0;
SegmentChangeResult result = SegmentNotChanged;
while(mWriteSegment >= aReadState.mSegment) {
if (AdvanceReadSegment(aReadState) == SegmentDeleted) {
result = SegmentDeleted;
}
}
// if we've free'd up a segment, notify output stream that pipe has
// room for a new segment.
if (result == SegmentDeleted &&
mOutput.OnOutputWritable(aEvents) == NotifyMonitor) {
mon.NotifyAll();
}
}
nsresult
nsPipe::GetWriteSegment(char*& aSegment, uint32_t& aSegmentLen)
{
@ -664,7 +713,7 @@ nsPipe::AdvanceWriteCursor(uint32_t aBytesWritten)
// notify input stream that pipe now contains additional data
bool needNotify = false;
for (uint32_t i = 0; i < mInputList.Length(); ++i) {
if (mInputList[i]->OnInputReadable(aBytesWritten, events)) {
if (mInputList[i]->OnInputReadable(aBytesWritten, events) == NotifyMonitor) {
needNotify = true;
}
}
@ -705,12 +754,12 @@ nsPipe::OnInputStreamException(nsPipeInputStream* aStream, nsresult aReason)
continue;
}
bool needNotify = mInputList[i]->OnInputException(aReason, events);
MonitorAction action = mInputList[i]->OnInputException(aReason, events);
mInputList.RemoveElementAt(i);
// Notify after element is removed in case we re-enter as a result.
if (needNotify) {
mon.Notify();
if (action == NotifyMonitor) {
mon.NotifyAll();
}
return;
@ -746,13 +795,13 @@ nsPipe::OnPipeException(nsresult aReason, bool aOutputOnly)
continue;
}
if (mInputList[i]->OnInputException(aReason, events)) {
if (mInputList[i]->OnInputException(aReason, events) == NotifyMonitor) {
needNotify = true;
}
}
mInputList = tmpInputList;
if (mOutput.OnOutputException(aReason, events)) {
if (mOutput.OnOutputException(aReason, events) == NotifyMonitor) {
needNotify = true;
}
@ -941,10 +990,10 @@ nsPipeInputStream::Wait()
return Status() == NS_BASE_STREAM_CLOSED ? NS_OK : Status();
}
bool
MonitorAction
nsPipeInputStream::OnInputReadable(uint32_t aBytesWritten, nsPipeEvents& aEvents)
{
bool result = false;
MonitorAction result = DoNotNotifyMonitor;
mAvailable += aBytesWritten;
@ -953,19 +1002,19 @@ nsPipeInputStream::OnInputReadable(uint32_t aBytesWritten, nsPipeEvents& aEvents
mCallback = 0;
mCallbackFlags = 0;
} else if (mBlocked) {
result = true;
result = NotifyMonitor;
}
return result;
}
bool
MonitorAction
nsPipeInputStream::OnInputException(nsresult aReason, nsPipeEvents& aEvents)
{
LOG(("nsPipeInputStream::OnInputException [this=%x reason=%x]\n",
this, aReason));
bool result = false;
MonitorAction result = DoNotNotifyMonitor;
NS_ASSERTION(NS_FAILED(aReason), "huh? successful exception");
@ -974,14 +1023,14 @@ nsPipeInputStream::OnInputException(nsresult aReason, nsPipeEvents& aEvents)
}
// force count of available bytes to zero.
mAvailable = 0;
mPipe->DrainInputStream(mReadState, aEvents, &mAvailable);
if (mCallback) {
aEvents.NotifyInputReady(this, mCallback);
mCallback = 0;
mCallbackFlags = 0;
} else if (mBlocked) {
result = true;
result = NotifyMonitor;
}
return result;
@ -1322,10 +1371,10 @@ nsPipeOutputStream::Wait()
return mPipe->mStatus == NS_BASE_STREAM_CLOSED ? NS_OK : mPipe->mStatus;
}
bool
MonitorAction
nsPipeOutputStream::OnOutputWritable(nsPipeEvents& aEvents)
{
bool result = false;
MonitorAction result = DoNotNotifyMonitor;
mWritable = true;
@ -1334,19 +1383,19 @@ nsPipeOutputStream::OnOutputWritable(nsPipeEvents& aEvents)
mCallback = 0;
mCallbackFlags = 0;
} else if (mBlocked) {
result = true;
result = NotifyMonitor;
}
return result;
}
bool
MonitorAction
nsPipeOutputStream::OnOutputException(nsresult aReason, nsPipeEvents& aEvents)
{
LOG(("nsPipeOutputStream::OnOutputException [this=%x reason=%x]\n",
this, aReason));
bool result = false;
MonitorAction result = DoNotNotifyMonitor;
NS_ASSERTION(NS_FAILED(aReason), "huh? successful exception");
mWritable = false;
@ -1356,7 +1405,7 @@ nsPipeOutputStream::OnOutputException(nsresult aReason, nsPipeEvents& aEvents)
mCallback = 0;
mCallbackFlags = 0;
} else if (mBlocked) {
result = true;
result = NotifyMonitor;
}
return result;