LibThreading: Add is_started state information to Thread

Users can now determine whether a thread has been started or not. A
started thread might also have already terminated.

Implementation note: We *could* detect this with pthread APIs maybe, but
this is much simpler.

2 files changed, 3 insertions, 0 deletions

diff --git a/Userland/Libraries/LibThreading/Thread.cpp b/Userland/Libraries/LibThreading/Thread.cpp
index 7659793c29..d62684de98 100644
--- a/Userland/Libraries/LibThreading/Thread.cpp
+++ b/Userland/Libraries/LibThreading/Thread.cpp
@@ -45,6 +45,7 @@ void Threading::Thread::start()
         VERIFY(rc == 0);
     }
     dbgln("Started thread \"{}\", tid = {}", m_thread_name, m_tid);
+    m_started = true;
 }
 
 void Threading::Thread::detach()
diff --git a/Userland/Libraries/LibThreading/Thread.h b/Userland/Libraries/LibThreading/Thread.h
index 612403846d..dec19c248a 100644
--- a/Userland/Libraries/LibThreading/Thread.h
+++ b/Userland/Libraries/LibThreading/Thread.h
@@ -32,6 +32,7 @@ public:
 
     String thread_name() const { return m_thread_name; }
     pthread_t tid() const { return m_tid; }
+    bool is_started() const { return m_started; }
 
 private:
     explicit Thread(Function<intptr_t()> action, StringView thread_name = {});
@@ -39,6 +40,7 @@ private:
     pthread_t m_tid { 0 };
     String m_thread_name;
     bool m_detached { false };
+    bool m_started { false };
 };
 
 template<typename T>