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Kernel: Implement FIFOs/named pipes

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This commit is contained in:
Peter Elliott 2020-07-16 15:23:03 -06:00 • committed by Andreas Kling
parent 76e34968fa
commit d01eba6fa3
5 changed files with 69 additions and 0 deletions
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29
Kernel/FileSystem/FIFO.cpp
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@ -60,6 +60,35 @@ NonnullRefPtr<FileDescription> FIFO::open_direction(FIFO::Direction direction)
return description;
}
NonnullRefPtr<FileDescription> FIFO::open_direction_blocking(FIFO::Direction direction)
{
Locker locker(m_open_lock);
auto description = open_direction(direction);
if (direction == Direction::Reader) {
m_read_open_queue.wake_all();
if (m_writers == 0) {
locker.unlock();
Thread::current()->wait_on(m_write_open_queue, "FIFO");
locker.lock();
}
}
if (direction == Direction::Writer) {
m_write_open_queue.wake_all();
if (m_readers == 0) {
locker.unlock();
Thread::current()->wait_on(m_read_open_queue, "FIFO");
locker.lock();
}
}
return description;
}
FIFO::FIFO(uid_t uid)
: m_uid(uid)
{