ADD: Open version, with important changes kept out.

Signed-off-by: Amlal <amlal.elmahrouss@icloud.com>

1 files changed, 69 insertions, 0 deletions

diff --git a/dev/Kernel/src/Semaphore.cc b/dev/Kernel/src/Semaphore.cc
new file mode 100644
index 00000000..b82efbfe
--- /dev/null
+++ b/dev/Kernel/src/Semaphore.cc
@@ -0,0 +1,69 @@
+/* -------------------------------------------
+
+	Copyright (C) 2024, Amlal EL Mahrouss, all rights reserved.
+
+------------------------------------------- */
+
+#include <KernelKit/UserProcessScheduler.h>
+#include <KernelKit/Semaphore.h>
+
+namespace Kernel
+{
+	/***********************************************************************************/
+	/// @brief Unlocks process out of the semaphore.
+	/***********************************************************************************/
+	Bool Semaphore::Unlock() noexcept
+	{
+		if (fLockingProcess)
+			fLockingProcess = UserProcess();
+		else
+			return No;
+
+		return Yes;
+	}
+
+	/***********************************************************************************/
+	/// @brief Locks process in the semaphore.
+	/***********************************************************************************/
+	Bool Semaphore::Lock(UserProcess& process)
+	{
+		if (!process || fLockingProcess)
+			return No;
+
+		fLockingProcess = process;
+
+		return Yes;
+	}
+
+	/***********************************************************************************/
+	/// @brief Checks if process is locked.
+	/***********************************************************************************/
+	Bool Semaphore::IsLocked() const
+	{
+		return fLockingProcess;
+	}
+
+	/***********************************************************************************/
+	/// @brief Try lock or wait.
+	/***********************************************************************************/
+	Bool Semaphore::LockOrWait(UserProcess& process, TimerInterface* timer)
+	{
+		if (timer == nullptr)
+			return No;
+
+		this->Lock(process);
+
+		timer->Wait();
+
+		return this->Lock(process);
+	}
+
+	/***********************************************************************************/
+	/// @brief Wait for process to be free.
+	/***********************************************************************************/
+	Void Semaphore::WaitForProcess() noexcept
+	{
+		while (fLockingProcess)
+			;
+	}
+} // namespace Kernel