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9201a06027
Before we start disabling acquisition of the big process lock for specific syscalls, make sure to document and assert that all the lock is held during all syscalls.
45 lines
1.5 KiB
C++
45 lines
1.5 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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namespace Kernel {
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KResultOr<FlatPtr> Process::sys$alarm(unsigned seconds)
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{
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VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this);
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REQUIRE_PROMISE(stdio);
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unsigned previous_alarm_remaining = 0;
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if (m_alarm_timer) {
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if (TimerQueue::the().cancel_timer(*m_alarm_timer)) {
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// The timer hasn't fired. Round up the remaining time (if any)
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Time remaining = m_alarm_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 (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 (!m_alarm_timer) {
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m_alarm_timer = adopt_ref_if_nonnull(new (nothrow) Timer());
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if (!m_alarm_timer)
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return ENOMEM;
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}
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auto timer_was_added = TimerQueue::the().add_timer_without_id(*m_alarm_timer, CLOCK_REALTIME_COARSE, deadline, [this]() {
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[[maybe_unused]] auto rc = 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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