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Start refactoring the windowing system to use an event loop.

Browse source 
Userspace programs can now open /dev/gui_events and read a stream of GUI_Event
structs one at a time.

I was stuck on a stupid problem where we'd reenter Scheduler::yield() due to
having one of the has_data_available_for_reading() implementations using locks.
This commit is contained in:
Andreas Kling 2019-01-14 14:21:51 +01:00
parent b4da4e8fbd
commit b0e3f73375
46 changed files with 283 additions and 292 deletions
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12
Kernel/Scheduler.cpp
View file

@ -9,6 +9,7 @@ static const dword time_slice = 5; // *10 = 50ms
Process* current;
static Process* s_colonel_process;
static bool s_in_yield;
struct TaskRedirectionData {
word selector;
@ -51,7 +52,7 @@ bool Scheduler::pick_next()
if (process.state() == Process::BlockedRead) {
ASSERT(process.m_blocked_fd != -1);
// FIXME: Block until the amount of data wanted is available.
if (process.m_fds[process.m_blocked_fd].descriptor->has_data_available_for_reading())
if (process.m_fds[process.m_blocked_fd].descriptor->has_data_available_for_reading(process))
process.unblock();
return true;
}
@ -142,6 +143,9 @@ bool Scheduler::pick_next()
bool Scheduler::yield()
{
ASSERT(!s_in_yield);
s_in_yield = true;
if (!current) {
kprintf("PANIC: sched_yield() with !current");
HANG;
@ -150,9 +154,12 @@ bool Scheduler::yield()
//dbgprintf("%s<%u> yield()\n", current->name().characters(), current->pid());
InterruptDisabler disabler;
if (!pick_next())
if (!pick_next()) {
s_in_yield = false;
return 1;
}
s_in_yield = false;
//dbgprintf("yield() jumping to new process: %x (%s)\n", current->farPtr().selector, current->name().characters());
switch_now();
return 0;
@ -271,6 +278,7 @@ void Scheduler::initialize()
initialize_redirection();
s_colonel_process = Process::create_kernel_process("colonel", nullptr);
current = nullptr;
s_in_yield = false;
load_task_register(s_redirection.selector);
}