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Kernel: Add a Finalizer process to take care of dying processes.

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Instead of processes themselves getting scheduled to finish dying,
let's have a Finalizer process that wakes up whenever someone is dying.
This way we can do all kinds of lock-taking in process cleanup without
risking reentering the scheduler.
This commit is contained in:
Andreas Kling 2019-02-06 18:45:21 +01:00
parent e05237485c
commit 6cba80510e
5 changed files with 59 additions and 23 deletions
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4
Kernel/Process.h
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@ -60,6 +60,7 @@ public:
static Vector<pid_t> all_pids();
static Vector<Process*> all_processes();
static void finalize_dying_processes();
enum State {
Invalid = 0,
@ -70,6 +71,7 @@ public:
Dying,
Dead,
BeingInspected,
BlockedLurking,
BlockedSleep,
BlockedWait,
BlockedRead,
@ -135,6 +137,7 @@ public:
void set_selector(word s) { m_far_ptr.selector = s; }
void set_state(State s) { m_state = s; }
void die();
void finalize();
pid_t sys$setsid();
pid_t sys$getsid(pid_t);
@ -453,6 +456,7 @@ static inline const char* to_string(Process::State state)
case Process::BlockedWrite: return "Write";
case Process::BlockedSignal: return "Signal";
case Process::BlockedSelect: return "Select";
case Process::BlockedLurking: return "Lurking";
case Process::BeingInspected: return "Inspect";
}
ASSERT_NOT_REACHED();