117 lines
2.6 KiB
C++
117 lines
2.6 KiB
C++
/*
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*
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* Conky, a system monitor, based on torsmo
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*
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* Please see COPYING for details
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*
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* Copyright (C) 2010 Pavel Labath et al.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#ifndef SEMAPHORE_HH
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#define SEMAPHORE_HH
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#include <cerrno>
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#include <cstdlib>
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#include <cstring>
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#include <stdexcept>
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#if defined(__APPLE__) && defined(__MACH__)
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/*
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* On Darwin, unnamed semaphores are not supported!
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* The only close equivalent to unnamed semaphores is using
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* GCD!
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*/
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#include <dispatch/dispatch.h>
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class semaphore {
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dispatch_semaphore_t sem;
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semaphore(const semaphore &) = delete;
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semaphore &operator=(const semaphore &) = delete;
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public:
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explicit semaphore(unsigned int value = 0) {
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sem = dispatch_semaphore_create(value);
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if (!sem) throw std::logic_error(strerror(errno));
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}
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~semaphore() { dispatch_release(sem); }
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void post() { dispatch_semaphore_signal(sem); }
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void wait() { dispatch_semaphore_wait(sem, DISPATCH_TIME_FOREVER); }
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bool trywait() {
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/* XXX Quick patch */
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#define DISPATCH_EAGAIN 49
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int ret = dispatch_semaphore_wait(sem, DISPATCH_TIME_NOW);
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while (ret > 0) {
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if (ret == DISPATCH_EAGAIN) {
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return false;
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} else if (errno != EINTR) {
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abort();
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}
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}
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return true;
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}
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};
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#else
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#include <semaphore.h>
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class semaphore {
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sem_t sem;
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semaphore(const semaphore &) = delete;
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semaphore &operator=(const semaphore &) = delete;
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public:
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semaphore(unsigned int value = 0) {
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if (sem_init(&sem, 0, value)) throw std::logic_error(strerror(errno));
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}
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~semaphore() { sem_destroy(&sem); }
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void post() {
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if (sem_post(&sem)) throw std::overflow_error(strerror(errno));
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}
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void wait() {
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while (sem_wait(&sem)) {
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if (errno != EINTR) abort();
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}
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}
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bool trywait() {
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while (sem_trywait(&sem)) {
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if (errno == EAGAIN)
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return false;
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else if (errno != EINTR)
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abort();
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}
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return true;
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}
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};
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#endif /* defined(__APPLE__) && defined(__MACH__) */
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#endif
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