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Kernel: Move block condition evaluation out of the Scheduler

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This makes the Scheduler a lot leaner by not having to evaluate
block conditions every time it is invoked. Instead evaluate them as
the states change, and unblock threads at that point.

This also implements some more waitid/waitpid/wait features and
behavior. For example, WUNTRACED and WNOWAIT are now supported. And
wait will now not return EINTR when SIGCHLD is delivered at the
same time.
This commit is contained in:
Tom 2020-11-29 16:05:27 -07:00 • committed by Andreas Kling
parent 6a620562cc
commit 046d6855f5
53 changed files with 2027 additions and 930 deletions
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24
Kernel/Syscall.cpp
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@ -93,6 +93,13 @@ int handle(RegisterState& regs, u32 function, u32 arg1, u32 arg2, u32 arg3)
if (function == SC_exit || function == SC_exit_thread) {
// These syscalls need special handling since they never return to the caller.
if (auto* tracer = current_thread->tracer(); tracer && tracer->is_tracing_syscalls()) {
regs.eax = 0;
tracer->set_trace_syscalls(false);
current_thread->tracer_trap(regs); // this triggers SIGTRAP and stops the thread!
}
cli();
if (function == SC_exit)
process.sys$exit((int)arg1);
@ -131,9 +138,9 @@ void syscall_handler(TrapFrame* trap)
auto& regs = *trap->regs;
auto current_thread = Thread::current();
if (current_thread->tracer() && current_thread->tracer()->is_tracing_syscalls()) {
current_thread->tracer()->set_trace_syscalls(false);
current_thread->tracer_trap(regs);
if (auto* tracer = current_thread->tracer(); tracer && tracer->is_tracing_syscalls()) {
tracer->set_trace_syscalls(false);
current_thread->tracer_trap(regs); // this triggers SIGTRAP and stops the thread!
}
// Make sure SMAP protection is enabled on syscall entry.
@ -176,11 +183,11 @@ void syscall_handler(TrapFrame* trap)
u32 arg1 = regs.edx;
u32 arg2 = regs.ecx;
u32 arg3 = regs.ebx;
regs.eax = (u32)Syscall::handle(regs, function, arg1, arg2, arg3);
regs.eax = Syscall::handle(regs, function, arg1, arg2, arg3);
if (current_thread->tracer() && current_thread->tracer()->is_tracing_syscalls()) {
current_thread->tracer()->set_trace_syscalls(false);
current_thread->tracer_trap(regs);
if (auto* tracer = current_thread->tracer(); tracer && tracer->is_tracing_syscalls()) {
tracer->set_trace_syscalls(false);
current_thread->tracer_trap(regs); // this triggers SIGTRAP and stops the thread!
}
process.big_lock().unlock();
@ -188,8 +195,7 @@ void syscall_handler(TrapFrame* trap)
// Check if we're supposed to return to userspace or just die.
current_thread->die_if_needed();
if (current_thread->has_unmasked_pending_signals())
(void)current_thread->block<Thread::SemiPermanentBlocker>(nullptr, Thread::SemiPermanentBlocker::Reason::Signal);
ASSERT(!g_scheduler_lock.own_lock());
}
}