1 files changed, 62 insertions, 0 deletions
diff --git a/dev/Kernel/Sources/Semaphore.cxx b/dev/Kernel/Sources/Semaphore.cxx
new file mode 100644
index 00000000..c159240e
--- /dev/null
+++ b/dev/Kernel/Sources/Semaphore.cxx
@@ -0,0 +1,62 @@
+/* -------------------------------------------
+
+	Copyright ZKA Technologies.
+
+------------------------------------------- */
+
+#include <KernelKit/ProcessScheduler.hxx>
+#include <KernelKit/Semaphore.hxx>
+
+namespace Kernel
+{
+	bool Semaphore::Unlock() noexcept
+	{
+		if (fLockingProcess)
+			fLockingProcess = nullptr;
+
+		return fLockingProcess == nullptr;
+	}
+
+	bool Semaphore::Lock(PROCESS_HEADER_BLOCK* process)
+	{
+		if (!process || fLockingProcess)
+			return false;
+
+		fLockingProcess = process;
+
+		return true;
+	}
+
+	bool Semaphore::IsLocked() const
+	{
+		return fLockingProcess;
+	}
+
+	bool Semaphore::LockOrWait(PROCESS_HEADER_BLOCK* process, HardwareTimerInterface* timer)
+	{
+		if (process == nullptr)
+			return false;
+
+		if (timer == nullptr)
+			return false;
+
+		this->Lock(process);
+
+		timer->Wait();
+
+		return this->Lock(process);
+	}
+
+	/// @brief Wait with process, either wait for process being invalid, or not being run.
+	Void Semaphore::WaitForProcess() noexcept
+	{
+		while (fLockingProcess)
+		{
+			if (fLockingProcess->GetStatus() != ProcessStatus::kRunning)
+			{
+				this->Unlock();
+				break;
+			}
+		}
+	}
+} // namespace Kernel