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Kernel: Remove ProcessInspectionHandle and make Process RefCounted

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By making the Process class RefCounted we don't really need
ProcessInspectionHandle anymore. This also fixes some race
conditions where a Process may be deleted while still being
used by ProcFS.

Also make sure to acquire the Process' lock when accessing
regions.

Last but not least, there's no reason why a thread can't be
scheduled while being inspected, though in practice it won't
happen anyway because the scheduler lock is held at the same
time.
This commit is contained in:
Tom 2020-08-01 20:04:56 -06:00 • committed by Andreas Kling
parent 5bbf6ed46b
commit 538b985487
13 changed files with 191 additions and 273 deletions
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17
Kernel/Thread.h
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@ -79,15 +79,12 @@ public:
return Processor::current().current_thread();
}
explicit Thread(Process&);
explicit Thread(NonnullRefPtr<Process>);
~Thread();
static Thread* from_tid(int);
static void finalize_dying_threads();
static Vector<Thread*> all_threads();
static bool is_thread(void*);
int tid() const { return m_tid; }
int pid() const;
@ -105,7 +102,7 @@ public:
Process& process() { return m_process; }
const Process& process() const { return m_process; }
String backtrace(ProcessInspectionHandle&);
String backtrace();
Vector<FlatPtr> raw_backtrace(FlatPtr ebp, FlatPtr eip) const;
const String& name() const { return m_name; }
@ -472,13 +469,13 @@ public:
void set_active(bool active)
{
ASSERT(g_scheduler_lock.is_locked());
ASSERT(g_scheduler_lock.own_lock());
m_is_active = active;
}
bool is_finalizable() const
{
ASSERT(g_scheduler_lock.is_locked());
ASSERT(g_scheduler_lock.own_lock());
return !m_is_active;
}
@ -516,7 +513,7 @@ private:
String backtrace_impl();
void reset_fpu_state();
Process& m_process;
NonnullRefPtr<Process> m_process;
int m_tid { -1 };
TSS32 m_tss;
Atomic<u32> m_cpu { 0 };
@ -633,7 +630,7 @@ template<typename Callback>
inline IterationDecision Scheduler::for_each_runnable(Callback callback)
{
ASSERT_INTERRUPTS_DISABLED();
ASSERT(g_scheduler_lock.is_locked());
ASSERT(g_scheduler_lock.own_lock());
auto& tl = g_scheduler_data->m_runnable_threads;
for (auto it = tl.begin(); it != tl.end();) {
auto& thread = *it;
@ -649,7 +646,7 @@ template<typename Callback>
inline IterationDecision Scheduler::for_each_nonrunnable(Callback callback)
{
ASSERT_INTERRUPTS_DISABLED();
ASSERT(g_scheduler_lock.is_locked());
ASSERT(g_scheduler_lock.own_lock());
auto& tl = g_scheduler_data->m_nonrunnable_threads;
for (auto it = tl.begin(); it != tl.end();) {
auto& thread = *it;