Max OS 0.3
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Public Member Functions | List of all members
MaxOS::common::Spinlock Class Reference

Enables a resource to be used by only one instance at a time through locking and unlocking. More...

#include <spinlock.h>

Public Member Functions

void lock ()
 Lock the spinlock once it is available.
 
void unlock ()
 Unlock the spinlock.
 
bool is_locked () const
 Check if the spinlock is locked.
 
void acquire ()
 Acquire the spinlock: wait until the lock is available, spinning until that happens.
 
void release ()
 Release the spinlock.
 

Detailed Description

Enables a resource to be used by only one instance at a time through locking and unlocking.

Definition at line 21 of file spinlock.h.

Member Function Documentation

◆ acquire()

void Spinlock::acquire ( )

Acquire the spinlock: wait until the lock is available, spinning until that happens.

Definition at line 51 of file spinlock.cpp.

51 {
52 while (__atomic_test_and_set(&m_locked, __ATOMIC_ACQUIRE))
53 asm("nop");
54}
MaxOS::common::Rectangle
Stores the left, top, width and height of a rectangle.
Definition rectangle.h:22

Referenced by lock().

◆ is_locked()

bool Spinlock::is_locked ( ) const

Check if the spinlock is locked.

Returns
True if the spinlock is locked, false otherwise

Definition at line 43 of file spinlock.cpp.

43 {
44 return m_locked;
45}

◆ lock()

void Spinlock::lock ( )

Lock the spinlock once it is available.

Definition at line 24 of file spinlock.cpp.

24 {
25 acquire();
26 m_locked = true;
27}
MaxOS::common::Spinlock::acquire
void acquire()
Acquire the spinlock: wait until the lock is available, spinning until that happens.
Definition spinlock.cpp:51

References acquire().

Referenced by MaxOS::processes::Process::add_thread(), MaxOS::memory::PhysicalMemoryManager::allocate_area(), MaxOS::memory::PhysicalMemoryManager::allocate_frame(), MaxOS::filesystem::format::ext2::Ext2Volume::create_inode(), MaxOS::filesystem::format::ext2::InodeHandler::free(), MaxOS::memory::PhysicalMemoryManager::free_area(), MaxOS::memory::PhysicalMemoryManager::free_frame(), MaxOS::filesystem::format::ext2::Ext2File::read(), MaxOS::filesystem::format::ext2::Ext2Directory::read_from_disk(), MaxOS::memory::PhysicalMemoryManager::reserve(), MaxOS::filesystem::format::ext2::Ext2File::write(), and MaxOS::processes::SharedMessageEndpoint::write().

◆ release()

void Spinlock::release ( )

Release the spinlock.

Definition at line 59 of file spinlock.cpp.

59 {
60 __atomic_clear(&m_locked, __ATOMIC_RELEASE);
61}

Referenced by unlock().

◆ unlock()

void Spinlock::unlock ( )

Unlock the spinlock.

Definition at line 32 of file spinlock.cpp.

32 {
33
34 m_locked = false;
35 release();
36}
MaxOS::common::Spinlock::release
void release()
Release the spinlock.
Definition spinlock.cpp:59

References release().

Referenced by MaxOS::processes::Process::add_thread(), MaxOS::memory::PhysicalMemoryManager::allocate_area(), MaxOS::memory::PhysicalMemoryManager::allocate_frame(), MaxOS::filesystem::format::ext2::Ext2Volume::create_inode(), MaxOS::filesystem::format::ext2::InodeHandler::free(), MaxOS::memory::PhysicalMemoryManager::free_area(), MaxOS::memory::PhysicalMemoryManager::free_frame(), MaxOS::memory::PhysicalMemoryManager::PhysicalMemoryManager(), MaxOS::filesystem::format::ext2::Ext2File::read(), MaxOS::filesystem::format::ext2::Ext2Directory::read_from_disk(), MaxOS::memory::PhysicalMemoryManager::reserve(), MaxOS::filesystem::format::ext2::Ext2File::write(), and MaxOS::processes::SharedMessageEndpoint::write().

The documentation for this class was generated from the following files: