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-rw-r--r--absl/algorithm/algorithm.h11
-rw-r--r--absl/base/BUILD.bazel41
-rw-r--r--absl/base/CMakeLists.txt27
-rw-r--r--absl/base/internal/periodic_sampler.cc50
-rw-r--r--absl/base/internal/periodic_sampler.h193
-rw-r--r--absl/base/internal/periodic_sampler_benchmark.cc70
-rw-r--r--absl/base/internal/periodic_sampler_test.cc175
-rw-r--r--absl/debugging/internal/stacktrace_win32-inl.inc2
-rw-r--r--absl/debugging/symbolize_win32.inc6
-rw-r--r--absl/synchronization/notification.cc9
-rw-r--r--absl/synchronization/notification.h9
-rw-r--r--absl/time/internal/cctz/src/zone_info_source.cc7
12 files changed, 581 insertions, 19 deletions
diff --git a/absl/algorithm/algorithm.h b/absl/algorithm/algorithm.h
index bb90215d..771228a0 100644
--- a/absl/algorithm/algorithm.h
+++ b/absl/algorithm/algorithm.h
@@ -84,6 +84,8 @@ It RotateImpl(It first, It middle, It last, std::false_type) {
} // namespace algorithm_internal
+// equal()
+//
// Compares the equality of two ranges specified by pairs of iterators, using
// the given predicate, returning true iff for each corresponding iterator i1
// and i2 in the first and second range respectively, pred(*i1, *i2) == true
@@ -104,8 +106,8 @@ bool equal(InputIter1 first1, InputIter1 last1, InputIter2 first2,
typename std::iterator_traits<InputIter2>::iterator_category{});
}
-// Performs comparison of two ranges specified by pairs of iterators using
-// operator==.
+// Overload of equal() that performs comparison of two ranges specified by pairs
+// of iterators using operator==.
template <typename InputIter1, typename InputIter2>
bool equal(InputIter1 first1, InputIter1 last1, InputIter2 first2,
InputIter2 last2) {
@@ -113,6 +115,8 @@ bool equal(InputIter1 first1, InputIter1 last1, InputIter2 first2,
algorithm_internal::EqualTo{});
}
+// linear_search()
+//
// Performs a linear search for `value` using the iterator `first` up to
// but not including `last`, returning true if [`first`, `last`) contains an
// element equal to `value`.
@@ -126,6 +130,8 @@ bool linear_search(InputIterator first, InputIterator last,
return std::find(first, last, value) != last;
}
+// rotate()
+//
// Performs a left rotation on a range of elements (`first`, `last`) such that
// `middle` is now the first element. `rotate()` returns an iterator pointing to
// the first element before rotation. This function is exactly the same as
@@ -135,7 +141,6 @@ bool linear_search(InputIterator first, InputIterator last,
// The complexity of this algorithm is the same as that of `std::rotate`, but if
// `ForwardIterator` is not a random-access iterator, then `absl::rotate`
// performs an additional pass over the range to construct the return value.
-
template <typename ForwardIterator>
ForwardIterator rotate(ForwardIterator first, ForwardIterator middle,
ForwardIterator last) {
diff --git a/absl/base/BUILD.bazel b/absl/base/BUILD.bazel
index 7e234bc6..f6b210f4 100644
--- a/absl/base/BUILD.bazel
+++ b/absl/base/BUILD.bazel
@@ -586,6 +586,47 @@ cc_test(
)
cc_library(
+ name = "periodic_sampler",
+ srcs = ["internal/periodic_sampler.cc"],
+ hdrs = ["internal/periodic_sampler.h"],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":core_headers",
+ ":exponential_biased",
+ ],
+)
+
+cc_test(
+ name = "periodic_sampler_test",
+ size = "small",
+ srcs = ["internal/periodic_sampler_test.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ visibility = ["//visibility:private"],
+ deps = [
+ ":core_headers",
+ ":periodic_sampler",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_binary(
+ name = "periodic_sampler_benchmark",
+ testonly = 1,
+ srcs = ["internal/periodic_sampler_benchmark.cc"],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ tags = ["benchmark"],
+ visibility = ["//visibility:private"],
+ deps = [
+ ":core_headers",
+ ":periodic_sampler",
+ "@com_github_google_benchmark//:benchmark_main",
+ ],
+)
+
+cc_library(
name = "scoped_set_env",
testonly = 1,
srcs = ["internal/scoped_set_env.cc"],
diff --git a/absl/base/CMakeLists.txt b/absl/base/CMakeLists.txt
index 7ab6955e..9b0174d8 100644
--- a/absl/base/CMakeLists.txt
+++ b/absl/base/CMakeLists.txt
@@ -536,6 +536,33 @@ absl_cc_test(
absl_cc_library(
NAME
+ periodic_sampler
+ SRCS
+ "internal/periodic_sampler.cc"
+ HDRS
+ "internal/periodic_sampler.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::core_headers
+ absl::exponential_biased
+)
+
+absl_cc_test(
+ NAME
+ periodic_sampler_test
+ SRCS
+ "internal/periodic_sampler_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::core_headers
+ absl::periodic_sampler
+ gmock_main
+)
+
+absl_cc_library(
+ NAME
scoped_set_env
SRCS
"internal/scoped_set_env.cc"
diff --git a/absl/base/internal/periodic_sampler.cc b/absl/base/internal/periodic_sampler.cc
new file mode 100644
index 00000000..439745d0
--- /dev/null
+++ b/absl/base/internal/periodic_sampler.cc
@@ -0,0 +1,50 @@
+// Copyright 2019 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
+//
+// https://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 "absl/base/internal/periodic_sampler.h"
+
+#include <atomic>
+
+#include "absl/base/internal/exponential_biased.h"
+
+namespace absl {
+namespace base_internal {
+
+int64_t PeriodicSamplerBase::GetExponentialBiased(int period) noexcept {
+ return rng_.Get(period);
+}
+
+bool PeriodicSamplerBase::SubtleConfirmSample() noexcept {
+ int current_period = period();
+
+ // Deal with period case 0 (always off) and 1 (always on)
+ if (ABSL_PREDICT_FALSE(current_period < 2)) {
+ stride_ = 0;
+ return current_period == 1;
+ }
+
+ // Check if this is the first call to Sample()
+ if (ABSL_PREDICT_FALSE(stride_ == 1)) {
+ stride_ = -1 - GetExponentialBiased(current_period);
+ if (stride_ < -1) {
+ ++stride_;
+ return false;
+ }
+ }
+ stride_ = -1 - GetExponentialBiased(current_period);
+ return true;
+}
+
+} // namespace base_internal
+} // namespace absl
diff --git a/absl/base/internal/periodic_sampler.h b/absl/base/internal/periodic_sampler.h
new file mode 100644
index 00000000..2c0600f0
--- /dev/null
+++ b/absl/base/internal/periodic_sampler.h
@@ -0,0 +1,193 @@
+// Copyright 2019 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
+//
+// https://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.
+
+#ifndef ABSL_BASE_INTERNAL_PERIODIC_SAMPLER_H_
+#define ABSL_BASE_INTERNAL_PERIODIC_SAMPLER_H_
+
+#include <stdint.h>
+
+#include <atomic>
+
+#include "absl/base/internal/exponential_biased.h"
+#include "absl/base/optimization.h"
+
+namespace absl {
+namespace base_internal {
+
+// PeriodicSamplerBase provides the basic period sampler implementation.
+//
+// This is the base class for the templated PeriodicSampler class, which holds
+// a global std::atomic value identified by a user defined tag, such that
+// each specific PeriodSampler implementation holds its own global period.
+//
+// PeriodicSamplerBase is thread-compatible except where stated otherwise.
+class PeriodicSamplerBase {
+ public:
+ // PeriodicSamplerBase is trivial / copyable / movable / destructible.
+ PeriodicSamplerBase() = default;
+ PeriodicSamplerBase(PeriodicSamplerBase&&) = default;
+ PeriodicSamplerBase(const PeriodicSamplerBase&) = default;
+
+ // Returns true roughly once every `period` calls. This is established by a
+ // randomly picked `stride` that is counted down on each call to `Sample`.
+ // This stride is picked such that the probability of `Sample()` returning
+ // true is 1 in `period`.
+ inline bool Sample() noexcept;
+
+ // The below methods are intended for optimized use cases where the
+ // size of the inlined fast path code is highly important. Applications
+ // should use the `Sample()` method unless they have proof that their
+ // specific use case requires the optimizations offered by these methods.
+ //
+ // An example of such a use case is SwissTable sampling. All sampling checks
+ // are in inlined SwissTable methods, and the number of call sites is huge.
+ // In this case, the inlined code size added to each translation unit calling
+ // SwissTable methods is non-trivial.
+ //
+ // The `SubtleMaybeSample()` function spuriously returns true even if the
+ // function should not be sampled, applications MUST match each call to
+ // 'SubtleMaybeSample()' returning true with a `SubtleConfirmSample()` call,
+ // and use the result of the latter as the sampling decision.
+ // In other words: the code should logically be equivalent to:
+ //
+ // if (SubtleMaybeSample() && SubtleConfirmSample()) {
+ // // Sample this call
+ // }
+ //
+ // In the 'inline-size' optimized case, the `SubtleConfirmSample()` call can
+ // be placed out of line, for example, the typical use case looks as follows:
+ //
+ // // --- frobber.h -----------
+ // void FrobberSampled();
+ //
+ // inline void FrobberImpl() {
+ // // ...
+ // }
+ //
+ // inline void Frobber() {
+ // if (ABSL_PREDICT_FALSE(sampler.SubtleMaybeSample())) {
+ // FrobberSampled();
+ // } else {
+ // FrobberImpl();
+ // }
+ // }
+ //
+ // // --- frobber.cc -----------
+ // void FrobberSampled() {
+ // if (!sampler.SubtleConfirmSample())) {
+ // // Spurious false positive
+ // FrobberImpl();
+ // return;
+ // }
+ //
+ // // Sampled execution
+ // // ...
+ // }
+ inline bool SubtleMaybeSample() noexcept;
+ bool SubtleConfirmSample() noexcept;
+
+ protected:
+ // We explicitly don't use a virtual destructor as this class is never
+ // virtually destroyed, and it keeps the class trivial, which avoids TLS
+ // prologue and epilogue code for our TLS instances.
+ ~PeriodicSamplerBase() = default;
+
+ // Returns the next stride for our sampler.
+ // This function is virtual for testing purposes only.
+ virtual int64_t GetExponentialBiased(int period) noexcept;
+
+ private:
+ // Returns the current period of this sampler. Thread-safe.
+ virtual int period() const noexcept = 0;
+
+ int64_t stride_ = 0;
+ ExponentialBiased rng_;
+};
+
+inline bool PeriodicSamplerBase::SubtleMaybeSample() noexcept {
+ // We explicitly count up and not down, as the compiler does not generate
+ // ideal code for counting down. See also https://gcc.godbolt.org/z/FTPDSM
+ //
+ // With `if (ABSL_PREDICT_FALSE(++stride_ < 0))`
+ // add QWORD PTR fs:sampler@tpoff+8, 1
+ // jns .L15
+ // ret
+ //
+ // With `if (ABSL_PREDICT_FALSE(--stride_ > 0))`
+ // mov rax, QWORD PTR fs:sampler@tpoff+8
+ // sub rax, 1
+ // mov QWORD PTR fs:sampler@tpoff+8, rax
+ // test rax, rax
+ // jle .L15
+ // ret
+ // add QWORD PTR fs:sampler@tpoff+8, 1
+ // jns .L15
+ // ret
+ //
+ // --stride >= 0 does work, but makes our logic slightly harder as in that
+ // case we have less convenient zero-init and over-run values.
+ if (ABSL_PREDICT_FALSE(++stride_ < 0)) {
+ return false;
+ }
+ return true;
+}
+
+inline bool PeriodicSamplerBase::Sample() noexcept {
+ return ABSL_PREDICT_FALSE(SubtleMaybeSample()) ? SubtleConfirmSample()
+ : false;
+}
+
+// PeriodicSampler is a concreted periodic sampler implementation.
+// The user provided Tag identifies the implementation, and is required to
+// isolate the global state of this instance from other instances.
+//
+// Typical use case:
+//
+// struct HashTablezTag {};
+// thread_local PeriodicSampler sampler;
+//
+// void HashTableSamplingLogic(...) {
+// if (sampler.Sample()) {
+// HashTableSlowSamplePath(...);
+// }
+// }
+//
+template <typename Tag, int default_period = 0>
+class PeriodicSampler final : public PeriodicSamplerBase {
+ public:
+ ~PeriodicSampler() = default;
+
+ int period() const noexcept final {
+ return period_.load(std::memory_order_relaxed);
+ }
+
+ // Sets the global period for this sampler. Thread-safe.
+ // Setting a period of 0 disables the sampler, i.e., every call to Sample()
+ // will return false. Setting a period of 1 puts the sampler in 'always on'
+ // mode, i.e., every call to Sample() returns true.
+ static void SetGlobalPeriod(int period) {
+ period_.store(period, std::memory_order_relaxed);
+ }
+
+ private:
+ static std::atomic<int> period_;
+};
+
+template <typename Tag, int default_period>
+std::atomic<int> PeriodicSampler<Tag, default_period>::period_(default_period);
+
+} // namespace base_internal
+} // namespace absl
+
+#endif // ABSL_BASE_INTERNAL_PERIODIC_SAMPLER_H_
diff --git a/absl/base/internal/periodic_sampler_benchmark.cc b/absl/base/internal/periodic_sampler_benchmark.cc
new file mode 100644
index 00000000..f87cef73
--- /dev/null
+++ b/absl/base/internal/periodic_sampler_benchmark.cc
@@ -0,0 +1,70 @@
+// Copyright 2019 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
+//
+// https://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 "benchmark/benchmark.h"
+#include "absl/base/internal/periodic_sampler.h"
+
+namespace absl {
+namespace base_internal {
+namespace {
+
+template <typename Sampler>
+void BM_Sample(Sampler* sampler, benchmark::State& state) {
+ for (auto _ : state) {
+ benchmark::DoNotOptimize(sampler);
+ benchmark::DoNotOptimize(sampler->Sample());
+ }
+}
+
+template <typename Sampler>
+void BM_SampleMinunumInlined(Sampler* sampler, benchmark::State& state) {
+ for (auto _ : state) {
+ benchmark::DoNotOptimize(sampler);
+ if (ABSL_PREDICT_FALSE(sampler->SubtleMaybeSample())) {
+ benchmark::DoNotOptimize(sampler->SubtleConfirmSample());
+ }
+ }
+}
+
+void BM_PeriodicSampler_ShortSample(benchmark::State& state) {
+ struct Tag {};
+ PeriodicSampler<Tag, 1024> sampler;
+ BM_Sample(&sampler, state);
+}
+BENCHMARK(BM_PeriodicSampler_ShortSample);
+
+void BM_PeriodicSampler_LongSample(benchmark::State& state) {
+ struct Tag {};
+ PeriodicSampler<Tag, 1024 * 1024> sampler;
+ BM_Sample(&sampler, state);
+}
+BENCHMARK(BM_PeriodicSampler_LongSample);
+
+void BM_PeriodicSampler_LongSampleMinunumInlined(benchmark::State& state) {
+ struct Tag {};
+ PeriodicSampler<Tag, 1024 * 1024> sampler;
+ BM_SampleMinunumInlined(&sampler, state);
+}
+BENCHMARK(BM_PeriodicSampler_LongSampleMinunumInlined);
+
+void BM_PeriodicSampler_Disabled(benchmark::State& state) {
+ struct Tag {};
+ PeriodicSampler<Tag, 0> sampler;
+ BM_Sample(&sampler, state);
+}
+BENCHMARK(BM_PeriodicSampler_Disabled);
+
+} // namespace
+} // namespace base_internal
+} // namespace absl
diff --git a/absl/base/internal/periodic_sampler_test.cc b/absl/base/internal/periodic_sampler_test.cc
new file mode 100644
index 00000000..1ba61377
--- /dev/null
+++ b/absl/base/internal/periodic_sampler_test.cc
@@ -0,0 +1,175 @@
+// Copyright 2019 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
+//
+// https://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 "absl/base/internal/periodic_sampler.h"
+
+#include <thread> // NOLINT(build/c++11)
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/base/attributes.h"
+#include "absl/base/macros.h"
+
+namespace absl {
+namespace base_internal {
+namespace {
+
+using testing::Eq;
+using testing::Return;
+using testing::StrictMock;
+
+class MockPeriodicSampler : public PeriodicSamplerBase {
+ public:
+ virtual ~MockPeriodicSampler() = default;
+
+ MOCK_METHOD(int, period, (), (const, noexcept));
+ MOCK_METHOD(int64_t, GetExponentialBiased, (int), (noexcept));
+};
+
+TEST(PeriodicSamplerBaseTest, Sample) {
+ StrictMock<MockPeriodicSampler> sampler;
+
+ EXPECT_CALL(sampler, period()).Times(3).WillRepeatedly(Return(16));
+ EXPECT_CALL(sampler, GetExponentialBiased(16))
+ .WillOnce(Return(1))
+ .WillOnce(Return(2))
+ .WillOnce(Return(3));
+
+ EXPECT_FALSE(sampler.Sample());
+ EXPECT_TRUE(sampler.Sample());
+
+ EXPECT_FALSE(sampler.Sample());
+ EXPECT_FALSE(sampler.Sample());
+ EXPECT_TRUE(sampler.Sample());
+
+ EXPECT_FALSE(sampler.Sample());
+ EXPECT_FALSE(sampler.Sample());
+ EXPECT_FALSE(sampler.Sample());
+}
+
+TEST(PeriodicSamplerBaseTest, ImmediatelySample) {
+ StrictMock<MockPeriodicSampler> sampler;
+
+ EXPECT_CALL(sampler, period()).Times(2).WillRepeatedly(Return(16));
+ EXPECT_CALL(sampler, GetExponentialBiased(16))
+ .WillOnce(Return(0))
+ .WillOnce(Return(1))
+ .WillOnce(Return(2));
+
+ EXPECT_TRUE(sampler.Sample());
+
+ EXPECT_FALSE(sampler.Sample());
+ EXPECT_TRUE(sampler.Sample());
+
+ EXPECT_FALSE(sampler.Sample());
+ EXPECT_FALSE(sampler.Sample());
+}
+
+TEST(PeriodicSamplerBaseTest, Disabled) {
+ StrictMock<MockPeriodicSampler> sampler;
+
+ EXPECT_CALL(sampler, period()).Times(3).WillRepeatedly(Return(0));
+
+ EXPECT_FALSE(sampler.Sample());
+ EXPECT_FALSE(sampler.Sample());
+ EXPECT_FALSE(sampler.Sample());
+}
+
+TEST(PeriodicSamplerBaseTest, AlwaysOn) {
+ StrictMock<MockPeriodicSampler> sampler;
+
+ EXPECT_CALL(sampler, period()).Times(3).WillRepeatedly(Return(1));
+
+ EXPECT_TRUE(sampler.Sample());
+ EXPECT_TRUE(sampler.Sample());
+ EXPECT_TRUE(sampler.Sample());
+}
+
+TEST(PeriodicSamplerBaseTest, Disable) {
+ StrictMock<MockPeriodicSampler> sampler;
+
+ EXPECT_CALL(sampler, period()).WillOnce(Return(16));
+ EXPECT_CALL(sampler, GetExponentialBiased(16)).WillOnce(Return(2));
+ EXPECT_FALSE(sampler.Sample());
+ EXPECT_FALSE(sampler.Sample());
+
+ EXPECT_CALL(sampler, period()).Times(2).WillRepeatedly(Return(0));
+
+ EXPECT_FALSE(sampler.Sample());
+ EXPECT_FALSE(sampler.Sample());
+}
+
+TEST(PeriodicSamplerBaseTest, Enable) {
+ StrictMock<MockPeriodicSampler> sampler;
+
+ EXPECT_CALL(sampler, period()).WillOnce(Return(0));
+ EXPECT_FALSE(sampler.Sample());
+
+ EXPECT_CALL(sampler, period()).Times(2).WillRepeatedly(Return(16));
+ EXPECT_CALL(sampler, GetExponentialBiased(16))
+ .Times(2)
+ .WillRepeatedly(Return(2));
+
+ EXPECT_FALSE(sampler.Sample());
+ EXPECT_FALSE(sampler.Sample());
+ EXPECT_TRUE(sampler.Sample());
+
+ EXPECT_FALSE(sampler.Sample());
+ EXPECT_FALSE(sampler.Sample());
+}
+
+TEST(PeriodicSamplerTest, ConstructConstInit) {
+ struct Tag {};
+ ABSL_CONST_INIT static PeriodicSampler<Tag> sampler;
+ (void)sampler;
+}
+
+TEST(PeriodicSamplerTest, DefaultPeriod0) {
+ struct Tag {};
+ PeriodicSampler<Tag> sampler;
+ EXPECT_THAT(sampler.period(), Eq(0));
+}
+
+TEST(PeriodicSamplerTest, DefaultPeriod) {
+ struct Tag {};
+ PeriodicSampler<Tag, 100> sampler;
+ EXPECT_THAT(sampler.period(), Eq(100));
+}
+
+TEST(PeriodicSamplerTest, SetGlobalPeriod) {
+ struct Tag1 {};
+ struct Tag2 {};
+ PeriodicSampler<Tag1, 25> sampler1;
+ PeriodicSampler<Tag2, 50> sampler2;
+
+ EXPECT_THAT(sampler1.period(), Eq(25));
+ EXPECT_THAT(sampler2.period(), Eq(50));
+
+ std::thread thread([] {
+ PeriodicSampler<Tag1, 25> sampler1;
+ PeriodicSampler<Tag2, 50> sampler2;
+ EXPECT_THAT(sampler1.period(), Eq(25));
+ EXPECT_THAT(sampler2.period(), Eq(50));
+ sampler1.SetGlobalPeriod(10);
+ sampler2.SetGlobalPeriod(20);
+ });
+ thread.join();
+
+ EXPECT_THAT(sampler1.period(), Eq(10));
+ EXPECT_THAT(sampler2.period(), Eq(20));
+}
+
+} // namespace
+} // namespace base_internal
+} // namespace absl
diff --git a/absl/debugging/internal/stacktrace_win32-inl.inc b/absl/debugging/internal/stacktrace_win32-inl.inc
index b46491f8..247e7428 100644
--- a/absl/debugging/internal/stacktrace_win32-inl.inc
+++ b/absl/debugging/internal/stacktrace_win32-inl.inc
@@ -54,7 +54,7 @@ static RtlCaptureStackBackTrace_Function* const RtlCaptureStackBackTrace_fn =
template <bool IS_STACK_FRAMES, bool IS_WITH_CONTEXT>
static int UnwindImpl(void** result, int* sizes, int max_depth, int skip_count,
- const void *ucp, int *min_dropped_frames) {
+ const void*, int* min_dropped_frames) {
int n = 0;
if (!RtlCaptureStackBackTrace_fn) {
// can't find a stacktrace with no function to call
diff --git a/absl/debugging/symbolize_win32.inc b/absl/debugging/symbolize_win32.inc
index b0fb3b9a..bd6fbd5e 100644
--- a/absl/debugging/symbolize_win32.inc
+++ b/absl/debugging/symbolize_win32.inc
@@ -34,7 +34,7 @@ namespace absl {
static HANDLE process = NULL;
-void InitializeSymbolizer(const char *argv0) {
+void InitializeSymbolizer(const char*) {
if (process != nullptr) {
return;
}
@@ -53,12 +53,12 @@ void InitializeSymbolizer(const char *argv0) {
}
}
-bool Symbolize(const void *pc, char *out, int out_size) {
+bool Symbolize(const void* pc, char* out, int out_size) {
if (out_size <= 0) {
return false;
}
alignas(SYMBOL_INFO) char buf[sizeof(SYMBOL_INFO) + MAX_SYM_NAME];
- SYMBOL_INFO *symbol = reinterpret_cast<SYMBOL_INFO *>(buf);
+ SYMBOL_INFO* symbol = reinterpret_cast<SYMBOL_INFO*>(buf);
symbol->SizeOfStruct = sizeof(SYMBOL_INFO);
symbol->MaxNameLen = MAX_SYM_NAME;
if (!SymFromAddr(process, reinterpret_cast<DWORD64>(pc), nullptr, symbol)) {
diff --git a/absl/synchronization/notification.cc b/absl/synchronization/notification.cc
index 53ace008..1eb7f416 100644
--- a/absl/synchronization/notification.cc
+++ b/absl/synchronization/notification.cc
@@ -44,15 +44,6 @@ Notification::~Notification() {
MutexLock l(&this->mutex_);
}
-static inline bool HasBeenNotifiedInternal(
- const std::atomic<bool> *notified_yet) {
- return notified_yet->load(std::memory_order_acquire);
-}
-
-bool Notification::HasBeenNotified() const {
- return HasBeenNotifiedInternal(&this->notified_yet_);
-}
-
void Notification::WaitForNotification() const {
if (!HasBeenNotifiedInternal(&this->notified_yet_)) {
this->mutex_.LockWhen(Condition(&HasBeenNotifiedInternal,
diff --git a/absl/synchronization/notification.h b/absl/synchronization/notification.h
index 82d111a5..36c2ce3d 100644
--- a/absl/synchronization/notification.h
+++ b/absl/synchronization/notification.h
@@ -73,7 +73,9 @@ class Notification {
// Notification::HasBeenNotified()
//
// Returns the value of the notification's internal "notified" state.
- bool HasBeenNotified() const;
+ bool HasBeenNotified() const {
+ return HasBeenNotifiedInternal(&this->notified_yet_);
+ }
// Notification::WaitForNotification()
//
@@ -105,6 +107,11 @@ class Notification {
void Notify();
private:
+ static inline bool HasBeenNotifiedInternal(
+ const std::atomic<bool>* notified_yet) {
+ return notified_yet->load(std::memory_order_acquire);
+ }
+
mutable Mutex mutex_;
std::atomic<bool> notified_yet_; // written under mutex_
};
diff --git a/absl/time/internal/cctz/src/zone_info_source.cc b/absl/time/internal/cctz/src/zone_info_source.cc
index 42f50c5e..d5758efa 100644
--- a/absl/time/internal/cctz/src/zone_info_source.cc
+++ b/absl/time/internal/cctz/src/zone_info_source.cc
@@ -49,10 +49,13 @@ std::unique_ptr<absl::time_internal::cctz::ZoneInfoSource> DefaultFactory(
#if !defined(__has_attribute)
#define __has_attribute(x) 0
#endif
-#if __has_attribute(weak) || defined(__GNUC__)
+// MinGW is GCC on Windows, so while it asserts __has_attribute(weak), the
+// Windows linker cannot handle that. Nor does the MinGW compiler know how to
+// pass "#pragma comment(linker, ...)" to the Windows linker.
+#if (__has_attribute(weak) || defined(__GNUC__)) && !defined(__MINGW32__)
ZoneInfoSourceFactory zone_info_source_factory
__attribute__((weak)) = DefaultFactory;
-#elif defined(_MSC_VER) && !defined(_LIBCPP_VERSION)
+#elif defined(_MSC_VER) && !defined(__MINGW32__) && !defined(_LIBCPP_VERSION)
extern ZoneInfoSourceFactory zone_info_source_factory;
extern ZoneInfoSourceFactory default_factory;
ZoneInfoSourceFactory default_factory = DefaultFactory;