Kernel: Move block condition evaluation out of the Scheduler

This makes the Scheduler a lot leaner by not having to evaluate
block conditions every time it is invoked. Instead evaluate them as
the states change, and unblock threads at that point.

This also implements some more waitid/waitpid/wait features and
behavior. For example, WUNTRACED and WNOWAIT are now supported. And
wait will now not return EINTR when SIGCHLD is delivered at the
same time.

1 files changed, 8 insertions, 2 deletions

diff --git a/Kernel/TTY/SlavePTY.cpp b/Kernel/TTY/SlavePTY.cpp
index e7daab0a39..8d74137d69 100644
--- a/Kernel/TTY/SlavePTY.cpp
+++ b/Kernel/TTY/SlavePTY.cpp
@@ -71,10 +71,11 @@ void SlavePTY::on_master_write(const UserOrKernelBuffer& buffer, ssize_t size)
 {
     ssize_t nread = buffer.read_buffered<128>(size, [&](const u8* data, size_t data_size) {
         for (size_t i = 0; i < data_size; ++i)
-            emit(data[i]);
+            emit(data[i], false);
         return (ssize_t)data_size;
     });
-    (void)nread;
+    if (nread > 0)
+        evaluate_block_conditions();
 }
 
 ssize_t SlavePTY::on_tty_write(const UserOrKernelBuffer& data, ssize_t size)
@@ -108,4 +109,9 @@ KResult SlavePTY::close()
     return KSuccess;
 }
 
+FileBlockCondition& SlavePTY::block_condition()
+{
+    return m_master->block_condition();
+}
+
 }