| /* |
| * Copyright (c) 2018, 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/precompiled.hpp" |
| #include "semaphore_bsd.hpp" |
| #include "utilities/debug.hpp" |
| |
| #include <semaphore.h> |
| |
| #ifdef __APPLE__ |
| // OS X doesn't support unamed POSIX semaphores, so the implementation in os_posix.cpp can't be used. |
| |
| static const char* sem_init_strerror(kern_return_t value) { |
| switch (value) { |
| case KERN_INVALID_ARGUMENT: return "Invalid argument"; |
| case KERN_RESOURCE_SHORTAGE: return "Resource shortage"; |
| default: return "Unknown"; |
| } |
| } |
| |
| OSXSemaphore::OSXSemaphore(uint value) { |
| kern_return_t ret = semaphore_create(mach_task_self(), &_semaphore, SYNC_POLICY_FIFO, value); |
| |
| guarantee(ret == KERN_SUCCESS, "Failed to create semaphore: %s", sem_init_strerror(ret)); |
| } |
| |
| OSXSemaphore::~OSXSemaphore() { |
| semaphore_destroy(mach_task_self(), _semaphore); |
| } |
| |
| void OSXSemaphore::signal(uint count) { |
| for (uint i = 0; i < count; i++) { |
| kern_return_t ret = semaphore_signal(_semaphore); |
| |
| assert(ret == KERN_SUCCESS, "Failed to signal semaphore"); |
| } |
| } |
| |
| void OSXSemaphore::wait() { |
| kern_return_t ret; |
| while ((ret = semaphore_wait(_semaphore)) == KERN_ABORTED) { |
| // Semaphore was interrupted. Retry. |
| } |
| assert(ret == KERN_SUCCESS, "Failed to wait on semaphore"); |
| } |
| |
| int64_t OSXSemaphore::currenttime() { |
| struct timeval tv; |
| gettimeofday(&tv, NULL); |
| return (tv.tv_sec * NANOSECS_PER_SEC) + (tv.tv_usec * 1000); |
| } |
| |
| bool OSXSemaphore::trywait() { |
| return timedwait(0, 0); |
| } |
| |
| bool OSXSemaphore::timedwait(unsigned int sec, int nsec) { |
| kern_return_t kr = KERN_ABORTED; |
| mach_timespec_t waitspec; |
| waitspec.tv_sec = sec; |
| waitspec.tv_nsec = nsec; |
| |
| int64_t starttime = currenttime(); |
| |
| kr = semaphore_timedwait(_semaphore, waitspec); |
| while (kr == KERN_ABORTED) { |
| int64_t totalwait = (sec * NANOSECS_PER_SEC) + nsec; |
| |
| int64_t current = currenttime(); |
| int64_t passedtime = current - starttime; |
| |
| if (passedtime >= totalwait) { |
| waitspec.tv_sec = 0; |
| waitspec.tv_nsec = 0; |
| } else { |
| int64_t waittime = totalwait - (current - starttime); |
| waitspec.tv_sec = waittime / NANOSECS_PER_SEC; |
| waitspec.tv_nsec = waittime % NANOSECS_PER_SEC; |
| } |
| |
| kr = semaphore_timedwait(_semaphore, waitspec); |
| } |
| |
| return kr == KERN_SUCCESS; |
| } |
| #endif // __APPLE__ |