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LibGUI+Kernel: Add a GLock class (userspace mutex.)

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It's basically a userspace port of the kernel's Lock class.
Added gettid() and donate() syscalls to support the timeslice donation
feature we already enjoyed in the kernel.
This commit is contained in:
Andreas Kling 2019-03-25 13:03:49 +01:00
parent 108b663618
commit 500df578fe
10 changed files with 176 additions and 12 deletions
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24
Kernel/Process.cpp
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@ -2461,3 +2461,27 @@ int Process::sys$create_thread(int(*entry)(void*), void* argument)
thread->set_state(Thread::State::Runnable);
return 0;
}
int Process::sys$gettid()
{
return current->tid();
}
int Process::sys$donate(int tid)
{
if (tid < 0)
return -EINVAL;
InterruptDisabler disabler;
Thread* beneficiary = nullptr;
for_each_thread([&] (Thread& thread) {
if (thread.tid() == tid) {
beneficiary = &thread;
return IterationDecision::Abort;
}
return IterationDecision::Continue;
});
if (!beneficiary)
return -ENOTHREAD;
Scheduler::donate_to(beneficiary, "sys$donate");
return 0;
}