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Kernel: Expose timers via a TimerId type

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The public consumers of the timer API shouldn't need to know
the how timer id's are tracked internally. Expose a typedef
instead to allow the internal implementation to be protected
from potential churn in the future.

It's also just good API design.
This commit is contained in:
Brian Gianforcaro 2020-04-26 12:59:27 -07:00 committed by Andreas Kling
parent 13c122b8b2
commit eeb5318c25
Notes: sideshowbarker 2024-07-19 07:15:24 +09:00 
Author: https://github.com/bgianfo
Commit: https://github.com/SerenityOS/serenity/commit/eeb5318c25a
Pull-request: https://github.com/SerenityOS/serenity/pull/1977
3 changed files with 10 additions and 8 deletions
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2
Kernel/Thread.cpp
View File

@ -893,7 +893,7 @@ Thread::BlockResult Thread::wait_on(WaitQueue& queue, timeval* timeout, Atomic<b
set_state(State::Queued);
queue.enqueue(*current);
u64 timer_id = 0;
TimerId timer_id {};
if (timeout) {
timer_id = TimerQueue::the().add_timer(*timeout, [&]() {
wake_from_queue();

6
Kernel/TimerQueue.cpp
View File

@ -47,7 +47,7 @@ TimerQueue::TimerQueue()
m_ticks_per_second = TimeManagement::the().ticks_per_second();
}
u64 TimerQueue::add_timer(NonnullOwnPtr<Timer>&& timer)
TimerId TimerQueue::add_timer(NonnullOwnPtr<Timer>&& timer)
{
ASSERT(timer->expires >= g_uptime);
@ -64,7 +64,7 @@ u64 TimerQueue::add_timer(NonnullOwnPtr<Timer>&& timer)
return m_timer_id_count;
}
u64 TimerQueue::add_timer(timeval& deadline, Function<void()>&& callback)
TimerId TimerQueue::add_timer(timeval& deadline, Function<void()>&& callback)
{
NonnullOwnPtr timer = make<Timer>();
timer->expires = g_uptime + seconds_to_ticks(deadline.tv_sec) + microseconds_to_ticks(deadline.tv_usec);
@ -72,7 +72,7 @@ u64 TimerQueue::add_timer(timeval& deadline, Function<void()>&& callback)
return add_timer(move(timer));
}
bool TimerQueue::cancel_timer(u64 id)
bool TimerQueue::cancel_timer(TimerId id)
{
auto it = m_timer_queue.find([id](auto& timer) { return timer->id == id; });
if (it.is_end())

10
Kernel/TimerQueue.h
View File

@ -34,8 +34,10 @@
namespace Kernel {
typedef u64 TimerId;
struct Timer {
u64 id;
TimerId id;
u64 expires;
Function<void()> callback;
bool operator<(const Timer& rhs) const
@ -56,9 +58,9 @@ class TimerQueue {
public:
static TimerQueue& the();
u64 add_timer(NonnullOwnPtr<Timer>&&);
u64 add_timer(timeval& timeout, Function<void()>&& callback);
bool cancel_timer(u64 id);
TimerId add_timer(NonnullOwnPtr<Timer>&&);
TimerId add_timer(timeval& timeout, Function<void()>&& callback);
bool cancel_timer(TimerId id);
void fire();
private: