87 lines
1.6 KiB
C++
87 lines
1.6 KiB
C++
#include <kernel/Scheduler.h>
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#include <kernel/SpinLock.h>
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namespace Kernel
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{
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void SpinLock::lock()
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{
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pid_t tid = Scheduler::current_tid();
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ASSERT(tid != m_locker);
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while (!m_locker.compare_exchange(-1, tid))
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Scheduler::get().reschedule();
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}
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void SpinLock::unlock()
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{
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ASSERT(m_locker == Scheduler::current_tid());
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m_locker = -1;
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}
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bool SpinLock::is_locked() const
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{
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return m_locker != -1;
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}
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void RecursiveSpinLock::lock()
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{
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pid_t tid = Scheduler::current_tid();
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if (m_locker != tid)
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{
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while (!m_locker.compare_exchange(-1, tid))
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Scheduler::get().reschedule();
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ASSERT(m_lock_depth == 0);
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}
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m_lock_depth++;
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}
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void RecursiveSpinLock::unlock()
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{
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ASSERT(m_lock_depth > 0);
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ASSERT(m_locker == Scheduler::current_tid());
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if (--m_lock_depth == 0)
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m_locker = -1;
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}
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bool RecursiveSpinLock::is_locked() const
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{
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return m_locker != -1;
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}
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void RecursivePrioritySpinLock::lock()
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{
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pid_t tid = Scheduler::current_tid();
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bool has_priority = !Thread::current().is_userspace();
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if (has_priority)
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m_queue_length++;
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if (m_locker != tid)
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{
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while (!((has_priority || m_queue_length == 0) && m_locker.compare_exchange(-1, tid)))
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Scheduler::get().reschedule();
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ASSERT(m_lock_depth == 0);
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}
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m_lock_depth++;
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}
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void RecursivePrioritySpinLock::unlock()
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{
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ASSERT(m_lock_depth > 0);
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ASSERT(m_locker == Scheduler::current_tid());
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bool has_priority = !Thread::current().is_userspace();
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if (has_priority)
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m_queue_length--;
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if (--m_lock_depth == 0)
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m_locker = -1;
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}
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bool RecursivePrioritySpinLock::is_locked() const
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{
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return m_locker != -1;
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}
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}
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