mirror of
https://github.com/RGBCube/serenity
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5759ea19fb
Access to Process::m_alarm_timer is serialized via SpinlockProtected, so there's no longer need for this syscall to use the big lock.
47 lines
1.7 KiB
C++
47 lines
1.7 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <Kernel/Process.h>
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#include <Kernel/Time/TimeManagement.h>
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#include <Kernel/TimerQueue.h>
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namespace Kernel {
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ErrorOr<FlatPtr> Process::sys$alarm(unsigned seconds)
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{
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VERIFY_NO_PROCESS_BIG_LOCK(this);
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TRY(require_promise(Pledge::stdio));
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return m_alarm_timer.with([&](auto& timer) -> ErrorOr<FlatPtr> {
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unsigned previous_alarm_remaining = 0;
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if (timer) {
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bool was_in_use = false;
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if (TimerQueue::the().cancel_timer(*timer, &was_in_use)) {
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// The timer hasn't fired. Round up the remaining time (if any)
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Time remaining = timer->remaining() + Time::from_nanoseconds(999'999'999);
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previous_alarm_remaining = remaining.to_truncated_seconds();
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}
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// We had an existing alarm, must return a non-zero value here!
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if (was_in_use && previous_alarm_remaining == 0)
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previous_alarm_remaining = 1;
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}
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if (seconds > 0) {
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auto deadline = TimeManagement::the().current_time(CLOCK_REALTIME_COARSE);
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deadline = deadline + Time::from_seconds(seconds);
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if (!timer) {
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timer = TRY(adopt_nonnull_ref_or_enomem(new (nothrow) Timer));
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}
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auto timer_was_added = TimerQueue::the().add_timer_without_id(*timer, CLOCK_REALTIME_COARSE, deadline, [this]() {
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MUST(send_signal(SIGALRM, nullptr));
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});
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if (!timer_was_added)
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return ENOMEM;
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}
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return previous_alarm_remaining;
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});
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}
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}
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