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/*
* Copyright (c) 2018, 2022, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
#include "precompiled.hpp"
#ifndef __APPLE__
#include "os_posix.hpp"
#include "runtime/os.hpp"
// POSIX unnamed semaphores are not supported on OS X.
#include "semaphore_posix.hpp"
#include <semaphore.h>
#define check_with_errno(check_type, cond, msg) \
do { \
int err = errno; \
check_type(cond, "%s; error='%s' (errno=%s)", msg, os::strerror(err), \
os::errno_name(err)); \
} while (false)
#define assert_with_errno(cond, msg) check_with_errno(assert, cond, msg)
#define guarantee_with_errno(cond, msg) check_with_errno(guarantee, cond, msg)
PosixSemaphore::PosixSemaphore(uint value) {
int ret = sem_init(&_semaphore, 0, value);
guarantee_with_errno(ret == 0, "Failed to initialize semaphore");
}
PosixSemaphore::~PosixSemaphore() {
int ret = sem_destroy(&_semaphore);
assert_with_errno(ret == 0, "sem_destroy failed");
}
void PosixSemaphore::signal(uint count) {
for (uint i = 0; i < count; i++) {
int ret = sem_post(&_semaphore);
assert_with_errno(ret == 0, "sem_post failed");
}
}
void PosixSemaphore::wait() {
int ret;
do {
ret = sem_wait(&_semaphore);
} while (ret != 0 && errno == EINTR);
assert_with_errno(ret == 0, "sem_wait failed");
}
bool PosixSemaphore::trywait() {
int ret;
do {
ret = sem_trywait(&_semaphore);
} while (ret != 0 && errno == EINTR);
assert_with_errno(ret == 0 || errno == EAGAIN, "trywait failed");
return ret == 0;
}
bool PosixSemaphore::timedwait(int64_t millis) {
struct timespec ts;
os::Posix::to_RTC_abstime(&ts, millis);
return timedwait(ts);
}
bool PosixSemaphore::timedwait(struct timespec ts) {
while (true) {
int result = sem_timedwait(&_semaphore, &ts);
if (result == 0) {
return true;
} else if (errno == EINTR) {
continue;
} else if (errno == ETIMEDOUT) {
return false;
} else {
assert_with_errno(false, "timedwait failed");
return false;
}
}
}
#endif // __APPLE__
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