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Kernel: Fix some problems with Thread::wait_on and Lock

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This changes the Thread::wait_on function to not enable interrupts
upon leaving, which caused some problems with page fault handlers
and in other situations. It may now be called from critical
sections, with interrupts enabled or disabled, and returns to the
same state.

This also requires some fixes to Lock. To aid debugging, a new
define LOCK_DEBUG is added that enables checking for Lock leaks
upon finalization of a Thread.
This commit is contained in:
Tom 2020-11-30 19:04:36 -07:00 • committed by Andreas Kling
parent 9e32d79e02
commit 78f1b5e359
10 changed files with 178 additions and 83 deletions
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17
Kernel/Lock.h
View file

@ -31,6 +31,7 @@
#include <AK/Types.h>
#include <Kernel/Arch/i386/CPU.h>
#include <Kernel/Forward.h>
#include <Kernel/Thread.h>
#include <Kernel/WaitQueue.h>
namespace Kernel {
@ -50,6 +51,9 @@ public:
};
void lock(Mode = Mode::Exclusive);
#ifdef LOCK_DEBUG
void lock(const char* file, int line, Mode mode = Mode::Exclusive);
#endif
void unlock();
bool force_unlock_if_locked();
bool is_locked() const { return m_holder; }
@ -77,6 +81,13 @@ private:
class Locker {
public:
#ifdef LOCK_DEBUG
ALWAYS_INLINE explicit Locker(const char* file, int line, Lock& l, Lock::Mode mode = Lock::Mode::Exclusive)
: m_lock(l)
{
m_lock.lock(file, line, mode);
}
#endif
ALWAYS_INLINE explicit Locker(Lock& l, Lock::Mode mode = Lock::Mode::Exclusive)
: m_lock(l)
{
@ -90,7 +101,11 @@ private:
Lock& m_lock;
};
#define LOCKER(...) Locker locker(__VA_ARGS__)
#ifdef LOCK_DEBUG
# define LOCKER(...) Locker locker(__FILE__, __LINE__, __VA_ARGS__)
#else
# define LOCKER(...) Locker locker(__VA_ARGS__)
#endif
template<typename T>
class Lockable {