108 lines
2.2 KiB
C++
108 lines
2.2 KiB
C++
/*
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* \brief Pthread handling
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* \author Christian Prochaska
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* \author Christian Helmuth
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* \date 2016-12-13
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*/
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/*
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* Copyright (C) 2019 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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#ifndef _LIBC__INTERNAL__PTHREAD_POOL_H_
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#define _LIBC__INTERNAL__PTHREAD_POOL_H_
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/* libc-internal includes */
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#include <internal/legacy.h>
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#include <internal/suspend.h>
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namespace Libc { class Pthread_pool; }
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struct Libc::Pthread_pool
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{
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struct Pthread : Timeout_handler
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{
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Genode::Lock lock { Genode::Lock::LOCKED };
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Pthread *next { nullptr };
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Timer_accessor &_timer_accessor;
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Constructible<Timeout> _timeout;
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void _construct_timeout_once()
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{
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if (!_timeout.constructed())
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_timeout.construct(_timer_accessor, *this);
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}
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Pthread(Timer_accessor &timer_accessor, Genode::uint64_t timeout_ms)
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: _timer_accessor(timer_accessor)
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{
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if (timeout_ms > 0) {
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_construct_timeout_once();
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_timeout->start(timeout_ms);
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}
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}
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Genode::uint64_t duration_left()
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{
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_construct_timeout_once();
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return _timeout->duration_left();
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}
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void handle_timeout() override
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{
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lock.unlock();
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}
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};
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Genode::Lock mutex;
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Pthread *pthreads = nullptr;
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Timer_accessor &timer_accessor;
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Pthread_pool(Timer_accessor &timer_accessor)
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: timer_accessor(timer_accessor) { }
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void resume_all()
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{
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Genode::Lock::Guard g(mutex);
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for (Pthread *p = pthreads; p; p = p->next)
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p->lock.unlock();
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}
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Genode::uint64_t suspend_myself(Suspend_functor & check, Genode::uint64_t timeout_ms)
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{
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Pthread myself { timer_accessor, timeout_ms };
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{
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Genode::Lock::Guard g(mutex);
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myself.next = pthreads;
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pthreads = &myself;
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}
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if (check.suspend())
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myself.lock.lock();
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{
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Genode::Lock::Guard g(mutex);
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/* address of pointer to next pthread allows to change the head */
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for (Pthread **next = &pthreads; *next; next = &(*next)->next) {
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if (*next == &myself) {
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*next = myself.next;
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break;
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}
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}
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}
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return timeout_ms > 0 ? myself.duration_left() : 0;
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}
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};
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#endif /* _LIBC__INTERNAL__PTHREAD_POOL_H_ */
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