99 lines
2.9 KiB
C++
99 lines
2.9 KiB
C++
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/*
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* Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#include "precompiled/precompiled.hpp"
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#ifndef __APPLE__
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#include "runtime/os.hpp"
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// POSIX unamed semaphores are not supported on OS X.
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#include "semaphore_posix.hpp"
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#include <semaphore.h>
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#define check_with_errno(check_type, cond, msg) \
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do { \
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int err = errno; \
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check_type(cond, "%s; error='%s' (errno=%s)", msg, os::strerror(err), \
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os::errno_name(err)); \
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} while (false)
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#define assert_with_errno(cond, msg) check_with_errno(assert, cond, msg)
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#define guarantee_with_errno(cond, msg) check_with_errno(guarantee, cond, msg)
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PosixSemaphore::PosixSemaphore(uint value) {
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int ret = sem_init(&_semaphore, 0, value);
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guarantee_with_errno(ret == 0, "Failed to initialize semaphore");
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}
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PosixSemaphore::~PosixSemaphore() {
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sem_destroy(&_semaphore);
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}
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void PosixSemaphore::signal(uint count) {
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for (uint i = 0; i < count; i++) {
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int ret = sem_post(&_semaphore);
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assert_with_errno(ret == 0, "sem_post failed");
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}
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}
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void PosixSemaphore::wait() {
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int ret;
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do {
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ret = sem_wait(&_semaphore);
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} while (ret != 0 && errno == EINTR);
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assert_with_errno(ret == 0, "sem_wait failed");
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}
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bool PosixSemaphore::trywait() {
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int ret;
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do {
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ret = sem_trywait(&_semaphore);
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} while (ret != 0 && errno == EINTR);
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assert_with_errno(ret == 0 || errno == EAGAIN, "trywait failed");
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return ret == 0;
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}
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bool PosixSemaphore::timedwait(struct timespec ts) {
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while (true) {
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int result = sem_timedwait(&_semaphore, &ts);
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if (result == 0) {
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return true;
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} else if (errno == EINTR) {
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continue;
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} else if (errno == ETIMEDOUT) {
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return false;
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} else {
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assert_with_errno(false, "timedwait failed");
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return false;
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}
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}
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}
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#endif // __APPLE__
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