mirror of
https://github.com/darlinghq/darling-libdispatch.git
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136 lines
3.5 KiB
C
136 lines
3.5 KiB
C
/*
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* Copyright (c) 2008-2011 Apple Inc. All rights reserved.
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*
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* @APPLE_APACHE_LICENSE_HEADER_START@
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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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* @APPLE_APACHE_LICENSE_HEADER_END@
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*/
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#ifndef __DISPATCH_TIME__
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#define __DISPATCH_TIME__
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#ifndef __DISPATCH_INDIRECT__
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#error "Please #include <dispatch/dispatch.h> instead of this file directly."
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#include <dispatch/base.h> // for HeaderDoc
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#endif
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#include <stdint.h>
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// <rdar://problem/6368156&7563559>
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#if TARGET_OS_MAC
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#include <mach/clock_types.h>
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#endif
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DISPATCH_ASSUME_NONNULL_BEGIN
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#ifdef NSEC_PER_SEC
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#undef NSEC_PER_SEC
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#endif
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#ifdef USEC_PER_SEC
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#undef USEC_PER_SEC
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#endif
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#ifdef NSEC_PER_USEC
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#undef NSEC_PER_USEC
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#endif
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#ifdef NSEC_PER_MSEC
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#undef NSEC_PER_MSEC
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#endif
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#define NSEC_PER_SEC 1000000000ull
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#define NSEC_PER_MSEC 1000000ull
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#define USEC_PER_SEC 1000000ull
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#define NSEC_PER_USEC 1000ull
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__BEGIN_DECLS
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struct timespec;
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/*!
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* @typedef dispatch_time_t
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*
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* @abstract
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* A somewhat abstract representation of time; where zero means "now" and
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* DISPATCH_TIME_FOREVER means "infinity" and every value in between is an
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* opaque encoding.
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*/
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typedef uint64_t dispatch_time_t;
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enum {
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DISPATCH_WALLTIME_NOW DISPATCH_ENUM_API_AVAILABLE(macos(10.14), ios(12.0), tvos(12.0), watchos(5.0)) = ~1ull,
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};
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#define DISPATCH_TIME_NOW (0ull)
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#define DISPATCH_TIME_FOREVER (~0ull)
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/*!
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* @function dispatch_time
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*
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* @abstract
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* Create a dispatch_time_t relative to the current value of the default or
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* wall time clock, or modify an existing dispatch_time_t.
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*
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* @discussion
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* On Apple platforms, the default clock is based on mach_absolute_time().
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*
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* @param when
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* An optional dispatch_time_t to add nanoseconds to. If DISPATCH_TIME_NOW is
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* passed, then dispatch_time() will use the default clock (which is based on
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* mach_absolute_time() on Apple platforms). If DISPATCH_WALLTIME_NOW is used,
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* dispatch_time() will use the value returned by gettimeofday(3).
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* dispatch_time(DISPATCH_WALLTIME_NOW, delta) is equivalent to
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* dispatch_walltime(NULL, delta).
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*
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* @param delta
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* Nanoseconds to add.
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*
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* @result
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* A new dispatch_time_t.
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*/
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API_AVAILABLE(macos(10.6), ios(4.0))
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DISPATCH_EXPORT DISPATCH_WARN_RESULT DISPATCH_NOTHROW
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dispatch_time_t
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dispatch_time(dispatch_time_t when, int64_t delta);
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/*!
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* @function dispatch_walltime
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*
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* @abstract
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* Create a dispatch_time_t using the wall clock.
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*
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* @discussion
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* On Mac OS X the wall clock is based on gettimeofday(3).
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*
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* @param when
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* A struct timespec to add time to. If NULL is passed, then
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* dispatch_walltime() will use the result of gettimeofday(3).
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* dispatch_walltime(NULL, delta) returns the same value as
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* dispatch_time(DISPATCH_WALLTIME_NOW, delta).
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*
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* @param delta
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* Nanoseconds to add.
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*
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* @result
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* A new dispatch_time_t.
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*/
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API_AVAILABLE(macos(10.6), ios(4.0))
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DISPATCH_EXPORT DISPATCH_WARN_RESULT DISPATCH_NOTHROW
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dispatch_time_t
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dispatch_walltime(const struct timespec *_Nullable when, int64_t delta);
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__END_DECLS
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DISPATCH_ASSUME_NONNULL_END
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#endif
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