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Kernel: Move some time related code from Scheduler into TimeManagement

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Use the TimerQueue to expire blocking operations, which is one less thing
the Scheduler needs to check on every iteration.

Also, add a BlockTimeout class that will automatically handle relative or
absolute timeouts as well as overriding timeouts (e.g. socket timeouts)
more consistently.

Also, rework the TimerQueue class to be able to fire events from
any processor, which requires Timer to be RefCounted. Also allow
creating id-less timers for use by blocking operations.
This commit is contained in:
Tom 2020-11-15 11:58:19 -07:00 • committed by Andreas Kling
parent e0e26c6c67
commit 6cb640eeba
19 changed files with 461 additions and 263 deletions
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28
Kernel/Syscalls/futex.cpp
View file

@ -29,19 +29,6 @@
namespace Kernel {
static void compute_relative_timeout_from_absolute(const timeval& absolute_time, timeval& relative_time)
{
// Convert absolute time to relative time of day.
timeval_sub(absolute_time, kgettimeofday(), relative_time);
}
static void compute_relative_timeout_from_absolute(const timespec& absolute_time, timeval& relative_time)
{
timeval tv_absolute_time;
timespec_to_timeval(absolute_time, tv_absolute_time);
compute_relative_timeout_from_absolute(tv_absolute_time, relative_time);
}
WaitQueue& Process::futex_queue(Userspace<const i32*> userspace_address)
{
auto& queue = m_futex_queues.ensure(userspace_address.ptr());
@ -66,20 +53,17 @@ int Process::sys$futex(Userspace<const Syscall::SC_futex_params*> user_params)
if (user_value != params.val)
return -EAGAIN;
timespec ts_abstimeout { 0, 0 };
if (params.timeout && !copy_from_user(&ts_abstimeout, params.timeout))
return -EFAULT;
timeval* optional_timeout = nullptr;
timeval relative_timeout { 0, 0 };
Thread::BlockTimeout timeout;
if (params.timeout) {
compute_relative_timeout_from_absolute(ts_abstimeout, relative_timeout);
optional_timeout = &relative_timeout;
timespec ts_abstimeout { 0, 0 };
if (!copy_from_user(&ts_abstimeout, params.timeout))
return -EFAULT;
timeout = Thread::BlockTimeout(true, &ts_abstimeout);
}
// FIXME: This is supposed to be interruptible by a signal, but right now WaitQueue cannot be interrupted.
WaitQueue& wait_queue = futex_queue((FlatPtr)params.userspace_address);
Thread::BlockResult result = Thread::current()->wait_on(wait_queue, "Futex", optional_timeout);
Thread::BlockResult result = Thread::current()->wait_on(wait_queue, "Futex", timeout);
if (result == Thread::BlockResult::InterruptedByTimeout) {
return -ETIMEDOUT;
}