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Kernel: Restore the previous thread state on SIGCONT after SIGSTOP

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When stopping a thread with the SIGSTOP signal, we now store the thread
state in Thread::m_stop_state. That state is then restored on SIGCONT.
This fixes an issue where previously-blocked threads would unblock
upon resume. Now they simply resume in the Blocked state, and it's up
to the regular unblocking mechanism to unblock them.

Fixes #1326.
This commit is contained in:
Andreas Kling 2020-03-01 15:14:17 +01:00
parent fbe9aad70a
commit 2839bb0be1
Notes: sideshowbarker 2024-07-19 08:57:13 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/2839bb0be1f
2 changed files with 11 additions and 4 deletions
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14
Kernel/Thread.cpp
View file

@ -495,13 +495,19 @@ ShouldUnblockThread Thread::dispatch_signal(u8 signal)
m_pending_signals &= ~(1 << (signal - 1));
if (signal == SIGSTOP) {
m_stop_signal = SIGSTOP;
set_state(Stopped);
if (!is_stopped()) {
m_stop_signal = SIGSTOP;
m_stop_state = m_state;
set_state(State::Stopped);
}
return ShouldUnblockThread::No;
}
if (signal == SIGCONT && state() == Stopped)
set_state(Runnable);
if (signal == SIGCONT && is_stopped()) {
ASSERT(m_stop_state != State::Invalid);
set_state(m_stop_state);
m_stop_state = State::Invalid;
}
auto handler_vaddr = action.handler_or_sigaction;
if (handler_vaddr.is_null()) {

1
Kernel/Thread.h
View file

@ -486,6 +486,7 @@ private:
u32 m_priority_boost { 0 };
u8 m_stop_signal { 0 };
State m_stop_state { Invalid };
bool m_dump_backtrace_on_finalization { false };
bool m_should_die { false };