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https://github.com/SerenityOS/serenity
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1219c65249
The coarse clocks in time.h are a linux extension that we've adopted. MacOS and the BSDs don't have it, so we need an alias in a platform header for Lagom builds.
106 lines
3.0 KiB
C
106 lines
3.0 KiB
C
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#ifdef __i386__
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# define AK_ARCH_I386 1
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#endif
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#ifdef __x86_64__
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# define AK_ARCH_X86_64 1
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#endif
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#if defined(__APPLE__) && defined(__MACH__)
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# define AK_OS_MACOS
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# define AK_OS_BSD_GENERIC
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#endif
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#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__DragonFly__)
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# define AK_OS_BSD_GENERIC
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#endif
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#define ARCH(arch) (defined(AK_ARCH_##arch) && AK_ARCH_##arch)
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#ifdef ALWAYS_INLINE
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# undef ALWAYS_INLINE
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#endif
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#define ALWAYS_INLINE [[gnu::always_inline]] inline
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#ifdef NEVER_INLINE
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# undef NEVER_INLINE
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#endif
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#define NEVER_INLINE [[gnu::noinline]]
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#ifdef FLATTEN
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# undef FLATTEN
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#endif
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#define FLATTEN [[gnu::flatten]]
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#ifdef NO_DISCARD
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# undef NO_DISCARD
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#endif
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#define NO_DISCARD [[nodiscard]]
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#ifndef __serenity__
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# define PAGE_SIZE sysconf(_SC_PAGESIZE)
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# include <errno.h>
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# include <fcntl.h>
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# include <stdlib.h>
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# include <string.h>
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inline int open_with_path_length(const char* path, size_t path_length, int options, mode_t mode)
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{
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auto* tmp = (char*)malloc(path_length + 1);
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memcpy(tmp, path, path_length);
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tmp[path_length] = '\0';
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int fd = open(tmp, options, mode);
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int saved_errno = errno;
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free(tmp);
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errno = saved_errno;
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return fd;
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}
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#endif
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ALWAYS_INLINE int count_trailing_zeroes_32(unsigned int val)
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{
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#if defined(__GNUC__) || defined(__clang__)
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return __builtin_ctz(val);
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#else
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for (u8 i = 0; i < 32; ++i) {
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if ((val >> i) & 1) {
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return i;
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}
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}
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return 0;
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#endif
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#ifdef AK_OS_BSD_GENERIC
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# define CLOCK_MONOTONIC_COARSE CLOCK_MONOTONIC
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# define CLOCK_REALTIME_COARSE CLOCK_REALTIME
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#endif
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}
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