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Export of internal Abseil changes.

Browse source 
--
586c41e29e80d9613434f18347d4a70a92a90989 by Jon Cohen <cohenjon@google.com>:

Whitespace cleanup

PiperOrigin-RevId: 207119388

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e28fc6932d68f7097918f3092079f07112e684c1 by Abseil Team <absl-team@google.com>:

Fix comment typo in mutex.h

PiperOrigin-RevId: 207024211

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b7714a5f189b2863f9cfc285ba428ca2059b83f4 by Abseil Team <absl-team@google.com>:

Raise the floor for gcc from gcc 4.7 to gcc 4.8.

PiperOrigin-RevId: 207021220

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262ae79150278ea1b4e512dfe8ff05c32768f429 by Matt Armstrong <marmstrong@google.com>:

Raise the floor for gcc from gcc 4.7 to gcc 4.8.

PiperOrigin-RevId: 206997741

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5aba0b15eaf6c5beff0e91670a7cdf5ad1151886 by Derek Mauro <dmauro@google.com>:

Use std::chrono to get the current time on both Apple and Windows
platforms, eliminating the unnecessarily complicated logic on Apple
platforms.

PiperOrigin-RevId: 206979219

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807a91adf876f7532050d442f00268754c0f260b by Derek Mauro <dmauro@google.com>:

Fix multiple definition problem when Abseil is combined with
gperftools on PowerPC.

https://github.com/abseil/abseil-cpp/pull/152

PiperOrigin-RevId: 206963083
GitOrigin-RevId: 586c41e29e80d9613434f18347d4a70a92a90989
Change-Id: I0ee65a733c423890b97dd3500f2d17449792387c
This commit is contained in:
Abseil Team 2018-08-02 10:08:43 -07:00 committed by Jon Cohen
parent 92e07e5590
commit 8f96be6ca6
7 changed files with 34 additions and 105 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
absl/synchronization/CMakeLists.txt
View file

@ -34,7 +34,7 @@ list(APPEND SYNCHRONIZATION_INTERNAL_HEADERS
# synchronization library
list(APPEND SYNCHRONIZATION_SRC
list(APPEND SYNCHRONIZATION_SRC
"barrier.cc"
"blocking_counter.cc"
"internal/create_thread_identity.cc"

2
absl/synchronization/mutex.h
View file

@ -558,7 +558,7 @@ class SCOPED_LOCKABLE ReaderMutexLock {
// WriterMutexLock
//
// The `WriterMutexLock` is a helper class, like `MutexLock`, which acquires and
// releases a write (exclusive) lock on a `Mutex` va RAII.
// releases a write (exclusive) lock on a `Mutex` via RAII.
class SCOPED_LOCKABLE WriterMutexLock {
public:
explicit WriterMutexLock(Mutex *mu) EXCLUSIVE_LOCK_FUNCTION(mu)

3
absl/time/BUILD.bazel
View file

@ -30,9 +30,8 @@ cc_library(
"clock.cc",
"duration.cc",
"format.cc",
"internal/get_current_time_ios.inc",
"internal/get_current_time_chrono.inc",
"internal/get_current_time_posix.inc",
"internal/get_current_time_windows.inc",
"time.cc",
],
hdrs = [

6
absl/time/clock.cc
View file

@ -57,10 +57,8 @@ Time Now() {
#endif
#endif
#if defined(__APPLE__)
#include "absl/time/internal/get_current_time_ios.inc"
#elif defined(_WIN32)
#include "absl/time/internal/get_current_time_windows.inc"
#if defined(__APPLE__) || defined(_WIN32)
#include "absl/time/internal/get_current_time_chrono.inc"
#else
#include "absl/time/internal/get_current_time_posix.inc"
#endif

29
absl/time/internal/get_current_time_chrono.inc Normal file
View file

@ -0,0 +1,29 @@
// Copyright 2018 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <chrono>
#include <cstdint>
namespace absl {
namespace time_internal {
static int64_t GetCurrentTimeNanosFromSystem() {
return std::chrono::duration_cast<std::chrono::nanoseconds>(
std::chrono::system_clock::now() -
std::chrono::system_clock::from_time_t(0))
.count();
}
} // namespace time_internal
} // namespace absl

80
absl/time/internal/get_current_time_ios.inc
View file

@ -1,80 +0,0 @@
#include "absl/time/clock.h"
#include <sys/time.h>
#include <ctime>
#include <cstdint>
#include "absl/base/internal/raw_logging.h"
// These are not defined in the Xcode 7.3.1 SDK Headers.
// Once we are no longer supporting Xcode 7.3.1 we can
// remove these.
#ifndef __WATCHOS_3_0
#define __WATCHOS_3_0 30000
#endif
#ifndef __TVOS_10_0
#define __TVOS_10_0 100000
#endif
#ifndef __IPHONE_10_0
#define __IPHONE_10_0 100000
#endif
#ifndef __MAC_10_12
#define __MAC_10_12 101200
#endif
namespace absl {
namespace time_internal {
static int64_t GetCurrentTimeNanosFromSystem() {
#if (__MAC_OS_X_VERSION_MAX_ALLOWED >= __MAC_10_12) || \
(__IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_10_0) || \
(__WATCH_OS_VERSION_MAX_ALLOWED >= __WATCHOS_3_0) || \
(__TV_OS_VERSION_MAX_ALLOWED >= __TVOS_10_0)
// clock_gettime_nsec_np is not defined on SDKs before Xcode 8.0.
// This preprocessor logic is based upon __CLOCK_AVAILABILITY in
// usr/include/time.h. Once we are no longer supporting Xcode 7.3.1 we can
// remove this #if.
// We must continue to check if it is defined until we are sure that ALL the
// platforms we are shipping on support it.
// clock_gettime_nsec_np is preferred because it may give higher accuracy than
// gettimeofday in future Apple operating systems.
// Currently (macOS 10.12/iOS 10.2) clock_gettime_nsec_np accuracy is
// microsecond accuracy (i.e. equivalent to gettimeofday).
if (&clock_gettime_nsec_np != nullptr) {
return clock_gettime_nsec_np(CLOCK_REALTIME);
}
#endif
#if (defined(__MAC_OS_X_VERSION_MIN_REQUIRED) && \
(__MAC_OS_X_VERSION_MIN_REQUIRED < __MAC_10_12)) || \
(defined(__IPHONE_OS_VERSION_MIN_REQUIRED) && \
(__IPHONE_OS_VERSION_MIN_REQUIRED < __IPHONE_10_0)) || \
(defined(__WATCH_OS_VERSION_MIN_REQUIRED) && \
(__WATCH_OS_VERSION_MIN_REQUIRED < __WATCHOS_3_0)) || \
(defined(__TV_OS_VERSION_MIN_REQUIRED) && \
(__TV_OS_VERSION_MIN_REQUIRED < __TVOS_10_0))
// We need this block in 2 different cases:
// a) where we are compiling with Xcode 7 in which case the block above
// will not be compiled in, and this is the only block executed.
// b) where we are compiling with Xcode 8+ but supporting operating systems
// that do not define clock_gettime_nsec_np, so this is in effect
// an else block to the block above.
// This block will not be compiled if the min supported version is
// guaranteed to supply clock_gettime_nsec_np.
//
// Once we know that clock_gettime_nsec_np is in the SDK *AND* exists on
// all the platforms we support, we can remove both this block and alter the
// block above to just call clock_gettime_nsec_np directly.
const int64_t kNanosPerSecond = 1000 * 1000 * 1000;
const int64_t kNanosPerMicrosecond = 1000;
struct timeval tp;
ABSL_RAW_CHECK(gettimeofday(&tp, nullptr) == 0, "Failed gettimeofday");
return (int64_t{tp.tv_sec} * kNanosPerSecond +
int64_t{tp.tv_usec} * kNanosPerMicrosecond);
#endif
}
} // namespace time_internal
} // namespace absl

17
absl/time/internal/get_current_time_windows.inc
View file

@ -1,17 +0,0 @@
#include "absl/time/clock.h"
#include <chrono>
#include <cstdint>
namespace absl {
namespace time_internal {
static int64_t GetCurrentTimeNanosFromSystem() {
return std::chrono::duration_cast<std::chrono::nanoseconds>(
std::chrono::system_clock::now() -
std::chrono::system_clock::from_time_t(0))
.count();
}
} // namespace time_internal
} // namespace absl