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Allow processes to go into a BeingInspected state (used by procfs.)

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This ensures that the process won't get scheduled, and so inspecting
it is safe and easy without blocking interrupts.
This commit is contained in:
Andreas Kling 2018-11-01 14:21:02 +01:00
parent dfaa2b6b02
commit 52607aa086
3 changed files with 37 additions and 19 deletions
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27
Kernel/Process.h
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@ -30,9 +30,10 @@ public:
Terminated = 3,
Crashing = 4,
Exiting = 5,
BlockedSleep = 6,
BlockedWait = 7,
BlockedRead = 8,
BeingInspected = 6,
BlockedSleep = 7,
BlockedWait = 8,
BlockedRead = 9,
};
enum RingLevel {
@ -75,7 +76,7 @@ public:
void setTicksLeft(DWORD t) { m_ticksLeft = t; }
void setSelector(WORD s) { m_farPtr.selector = s; }
void setState(State s) { m_state = s; }
void set_state(State s) { m_state = s; }
uid_t sys$getuid();
gid_t sys$getgid();
@ -203,6 +204,24 @@ private:
Vector<String> m_initialEnvironment;
};
class ProcessInspectionScope {
public:
ProcessInspectionScope(Process& process)
: m_process(process)
, m_original_state(process.state())
{
m_process.set_state(Process::BeingInspected);
}
~ProcessInspectionScope()
{
m_process.set_state(m_original_state);
}
private:
Process& m_process;
Process::State m_original_state { Process::Invalid };
};
extern void yield();
extern bool scheduleNewProcess();
extern void switchNow();