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Generalize the SpinLock and move it to AK.

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Add a separate lock to protect the VFS. I think this might be a good idea.
I'm not sure it's a good approach though. I'll fiddle with it as I go along.

It's really fun to figure out all these things on my own.
This commit is contained in:
Andreas Kling
2018-10-23 23:32:53 +02:00
parent e4bfcd2346
commit 018da1be11
11 changed files with 88 additions and 203 deletions
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8
VirtualFileSystem/FileHandle.cpp
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@@ -24,6 +24,8 @@ bool additionWouldOverflow(Unix::off_t a, Unix::off_t b)
int FileHandle::stat(Unix::stat* buffer)
{
Locker locker(VirtualFileSystem::lock());
if (!m_vnode)
return -EBADF;
@@ -49,6 +51,8 @@ int FileHandle::stat(Unix::stat* buffer)
Unix::off_t FileHandle::seek(Unix::off_t offset, int whence)
{
Locker locker(VirtualFileSystem::lock());
if (!m_vnode)
return -EBADF;
@@ -91,6 +95,8 @@ Unix::off_t FileHandle::seek(Unix::off_t offset, int whence)
Unix::ssize_t FileHandle::read(byte* buffer, Unix::size_t count)
{
Locker locker(VirtualFileSystem::lock());
if (m_vnode->isCharacterDevice()) {
// FIXME: What should happen to m_currentOffset?
return m_vnode->characterDevice()->read(buffer, count);
@@ -102,6 +108,8 @@ Unix::ssize_t FileHandle::read(byte* buffer, Unix::size_t count)
ByteBuffer FileHandle::readEntireFile()
{
Locker locker(VirtualFileSystem::lock());
if (m_vnode->isCharacterDevice()) {
auto buffer = ByteBuffer::createUninitialized(1024);
Unix::ssize_t nread = m_vnode->characterDevice()->read(buffer.pointer(), buffer.size());