37768ed9e1
The non-const getSkybox() method is especially useful to client code that needs to change the clear color, but does not have direct access to the Renderer object.
69 lines
2.2 KiB
C++
69 lines
2.2 KiB
C++
/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef UTILS_LINUX_FUTEX_H
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#define UTILS_LINUX_FUTEX_H
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#include <linux/futex.h>
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#include <sys/syscall.h>
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#include <errno.h>
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#include <stdbool.h>
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#include <unistd.h>
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#include <utils/compiler.h>
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struct timespec;
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namespace utils {
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namespace linuxutil {
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inline int futex(volatile void* ftx, int op, int value,
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const struct timespec* timeout, int bitset) {
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// from futex man pages:
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// In the event of an error (and assuming that futex() was invoked via syscall(2)),
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// all operations return -1 and set errno to indicate the cause of the error.
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int err = (int)syscall(__NR_futex, ftx, op, value, timeout, nullptr, bitset);
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if (UTILS_UNLIKELY(err == -1)) {
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err = -errno;
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}
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return err;
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}
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inline int futex_wake(volatile void* ftx, int count) {
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return futex(ftx, FUTEX_WAKE, count, nullptr, 0);
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}
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inline int futex_wake_ex(volatile void* ftx, bool shared, int count) {
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return futex(ftx, shared ? FUTEX_WAKE : FUTEX_WAKE_PRIVATE, count, nullptr, 0);
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}
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inline int futex_wait(volatile void* ftx, int value, const struct timespec* timeout) {
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return futex(ftx, FUTEX_WAIT, value, timeout, 0);
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}
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inline int futex_wait_ex(volatile void* ftx, bool shared, int value,
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bool use_realtime_clock, const struct timespec* abs_timeout) {
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return futex(ftx, (shared ? FUTEX_WAIT_BITSET : FUTEX_WAIT_BITSET_PRIVATE) |
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(use_realtime_clock ? FUTEX_CLOCK_REALTIME : 0), value, abs_timeout,
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FUTEX_BITSET_MATCH_ANY);
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}
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} // namespace linuxutil
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} // namespace utils
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#endif // UTILS_LINUX_FUTEX_H
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