From 9f75b047141070b97408608f9eaa37787fc1146d Mon Sep 17 00:00:00 2001
From: Bananymous <bananymousosq@gmail.com>
Date: Thu, 27 Jul 2023 18:34:06 +0300
Subject: [PATCH] Kernel: Scheduler can now check if tid is valid

Tid can become invalid if the thread is already terminated
---
 kernel/include/kernel/Scheduler.h |  2 ++
 kernel/kernel/Scheduler.cpp       | 22 ++++++++++++++++++++++
 2 files changed, 24 insertions(+)

diff --git a/kernel/include/kernel/Scheduler.h b/kernel/include/kernel/Scheduler.h
index 42a4ffd6d2..1b4a8fa683 100644
--- a/kernel/include/kernel/Scheduler.h
+++ b/kernel/include/kernel/Scheduler.h
@@ -31,6 +31,8 @@ namespace Kernel
 		Thread& current_thread();
 		static pid_t current_tid();
 
+		static bool is_valid_tid(pid_t tid);
+
 	private:
 		Scheduler() = default;
 
diff --git a/kernel/kernel/Scheduler.cpp b/kernel/kernel/Scheduler.cpp
index a815fe8099..a65ad08bed 100644
--- a/kernel/kernel/Scheduler.cpp
+++ b/kernel/kernel/Scheduler.cpp
@@ -373,4 +373,26 @@ namespace Kernel
 		}
 	}
 
+	bool Scheduler::is_valid_tid(pid_t tid)
+	{
+		CriticalScope _;
+
+		if (s_instance == nullptr)
+			return tid == 0;
+
+		for (auto& thread : s_instance->m_active_threads)
+			if (thread.thread->tid() == tid)
+				return true;
+		
+		for (auto& thread : s_instance->m_sleeping_threads)
+			if (thread.thread->tid() == tid)
+				return true;
+
+		for (auto& thread : s_instance->m_blocking_threads)
+			if (thread.thread->tid() == tid)
+				return true;
+
+		return false;
+	}
+
 }
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