Kernel: Make TID's be unique PID's

This is a little strange, but it's how I understand things should work.

The first thread in a new process now has TID == PID.
Additional threads subsequently spawned in that process all have unique
TID's generated by the PID allocator. TIDs are now globally unique.

1 files changed, 6 insertions, 1 deletions

diff --git a/Kernel/Thread.cpp b/Kernel/Thread.cpp
index 843ecc18ac..c3d62b13c7 100644
--- a/Kernel/Thread.cpp
+++ b/Kernel/Thread.cpp
@@ -43,9 +43,14 @@ HashTable<Thread*>& thread_table()
 
 Thread::Thread(Process& process)
     : m_process(process)
-    , m_tid(process.m_next_tid++)
     , m_name(process.name())
 {
+    if (m_process.m_thread_count == 0) {
+        // First thread gets TID == PID
+        m_tid = process.pid();
+    } else {
+        m_tid = Process::allocate_pid();
+    }
     process.m_thread_count++;
     dbgprintf("Thread{%p}: New thread TID=%u in %s(%u)\n", this, m_tid, process.name().characters(), process.pid());
     set_default_signal_dispositions();