Export of internal Abseil changes

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17141711ee419daa597a9f31e73721f80143e55a by Gennadiy Rozental <[email protected]>:

Import of CCTZ from GitHub.

PiperOrigin-RevId: 401384949

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ac48584a7b16e8a12e26d49deb6cddec584a20b5 by Derek Mauro <[email protected]>:

Internal change

PiperOrigin-RevId: 401337785

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8a51bb7c962845e0707240c5ba12c1b80f6fbbe9 by Derek Mauro <[email protected]>:

Internal change

PiperOrigin-RevId: 401047691

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8e18024510869247f3c04c7807c93709eca2322a by Chris Kennelly <[email protected]>:

Note that SpinLock does not guarantee priorities for wakeups.

PiperOrigin-RevId: 400999238

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75bc09b5f95fbb74b74d14c370bfb80011e8fb7f by Derek Mauro <[email protected]>:

Add visibility restrictions to some internal targets

PiperOrigin-RevId: 400718253

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1de5061016bc42cd7be009c9725ed2343ce12e3d by Abseil Team <[email protected]>:

Make it clear that operator<< can also be used in place of ToString when logging absl::Status.

PiperOrigin-RevId: 400248269

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cda15d9dc6e5cd569de7e5e73f409b72a3caed51 by Abseil Team <[email protected]>:

Minor cleanup

PiperOrigin-RevId: 400087535

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b001375ec47da3a0434be9ca9a45c0df510e7dda by Abseil Team <[email protected]>:

Move periodic_sampler from base/internal to profiling/internal

PiperOrigin-RevId: 400038533

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e7e02e686abc3900e723080849a3607d190ef57f by Abseil Team <[email protected]>:

Move exponential_biased from base/internal to profiling/internal

PiperOrigin-RevId: 400020329
GitOrigin-RevId: 17141711ee419daa597a9f31e73721f80143e55a
Change-Id: I10924df7e1cc198447813dbe97a374a5cef66b49

Author: Abseil Team

CMake/AbseilDll.cmake

@@ -17,8 +17,6 @@ set(ABSL_INTERNAL_DLL_FILES
   "base/internal/dynamic_annotations.h"
   "base/internal/endian.h"
   "base/internal/errno_saver.h"
-  "base/internal/exponential_biased.cc"
-  "base/internal/exponential_biased.h"
   "base/internal/fast_type_id.h"
   "base/internal/hide_ptr.h"
   "base/internal/identity.h"
@@ -28,8 +26,6 @@ set(ABSL_INTERNAL_DLL_FILES
   "base/internal/low_level_alloc.h"
   "base/internal/low_level_scheduling.h"
   "base/internal/per_thread_tls.h"
-  "base/internal/periodic_sampler.cc"
-  "base/internal/periodic_sampler.h"
   "base/internal/pretty_function.h"
   "base/internal/raw_logging.cc"
   "base/internal/raw_logging.h"
@@ -133,6 +129,10 @@ set(ABSL_INTERNAL_DLL_FILES
   "numeric/int128.h"
   "numeric/internal/bits.h"
   "numeric/internal/representation.h"
+  "profiling/internal/exponential_biased.cc"
+  "profiling/internal/exponential_biased.h"
+  "profiling/internal/periodic_sampler.cc"
+  "profiling/internal/periodic_sampler.h"
   "profiling/internal/sample_recorder.h"
   "random/bernoulli_distribution.h"
   "random/beta_distribution.h"

absl/base/BUILD.bazel

@@ -593,75 +593,6 @@ cc_test(
     ],
 )
 
-cc_library(
-    name = "exponential_biased",
-    srcs = ["internal/exponential_biased.cc"],
-    hdrs = ["internal/exponential_biased.h"],
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    visibility = [
-        "//absl:__subpackages__",
-    ],
-    deps = [
-        ":config",
-        ":core_headers",
-    ],
-)
-
-cc_test(
-    name = "exponential_biased_test",
-    size = "small",
-    srcs = ["internal/exponential_biased_test.cc"],
-    copts = ABSL_TEST_COPTS,
-    linkopts = ABSL_DEFAULT_LINKOPTS,
-    visibility = ["//visibility:private"],
-    deps = [
-        ":exponential_biased",
-        "//absl/strings",
-        "@com_google_googletest//:gtest_main",
-    ],
-)
-
-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,

absl/base/CMakeLists.txt

@@ -519,60 +519,6 @@ absl_cc_test(
     GTest::gtest_main
 )
 
-absl_cc_library(
-  NAME
-    exponential_biased
-  SRCS
-    "internal/exponential_biased.cc"
-  HDRS
-    "internal/exponential_biased.h"
-  COPTS
-    ${ABSL_DEFAULT_COPTS}
-  DEPS
-    absl::config
-    absl::core_headers
-)
-
-absl_cc_test(
-  NAME
-    exponential_biased_test
-  SRCS
-    "internal/exponential_biased_test.cc"
-  COPTS
-    ${ABSL_TEST_COPTS}
-  DEPS
-    absl::exponential_biased
-    absl::strings
-    GTest::gmock_main
-)
-
-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
-    GTest::gmock_main
-)
-
 absl_cc_library(
   NAME
     scoped_set_env

absl/base/internal/spinlock.h

@@ -16,13 +16,15 @@
 
 //  Most users requiring mutual exclusion should use Mutex.
 //  SpinLock is provided for use in two situations:
-//   - for use in code that Mutex itself depends on
+//   - for use by Abseil internal code that Mutex itself depends on
 //   - for async signal safety (see below)
 
 // SpinLock is async signal safe.  If a spinlock is used within a signal
 // handler, all code that acquires the lock must ensure that the signal cannot
 // arrive while they are holding the lock.  Typically, this is done by blocking
 // the signal.
+//
+// Threads waiting on a SpinLock may be woken in an arbitrary order.
 
 #ifndef ABSL_BASE_INTERNAL_SPINLOCK_H_
 #define ABSL_BASE_INTERNAL_SPINLOCK_H_

absl/base/internal/spinlock_wait.h

@@ -39,6 +39,8 @@ struct SpinLockWaitTransition {
 // satisfying 0<=i<n && trans[i].done, atomically make the transition,
 // then return the old value of *w.   Make any other atomic transitions
 // where !trans[i].done, but continue waiting.
+//
+// Wakeups for threads blocked on SpinLockWait do not respect priorities.
 uint32_t SpinLockWait(std::atomic<uint32_t> *w, int n,
                       const SpinLockWaitTransition trans[],
                       SchedulingMode scheduling_mode);

absl/container/BUILD.bazel

@@ -510,9 +510,9 @@ cc_library(
         ":have_sse",
         "//absl/base",
         "//absl/base:core_headers",
-        "//absl/base:exponential_biased",
         "//absl/debugging:stacktrace",
         "//absl/memory",
+        "//absl/profiling:exponential_biased",
         "//absl/profiling:sample_recorder",
         "//absl/synchronization",
         "//absl/utility",

absl/container/internal/hashtablez_sampler.cc

@@ -21,10 +21,10 @@
 #include <limits>
 
 #include "absl/base/attributes.h"
-#include "absl/base/internal/exponential_biased.h"
 #include "absl/container/internal/have_sse.h"
 #include "absl/debugging/stacktrace.h"
 #include "absl/memory/memory.h"
+#include "absl/profiling/internal/exponential_biased.h"
 #include "absl/profiling/internal/sample_recorder.h"
 #include "absl/synchronization/mutex.h"
 
@@ -40,7 +40,7 @@ ABSL_CONST_INIT std::atomic<bool> g_hashtablez_enabled{
 ABSL_CONST_INIT std::atomic<int32_t> g_hashtablez_sample_parameter{1 << 10};
 
 #if defined(ABSL_INTERNAL_HASHTABLEZ_SAMPLE)
-ABSL_PER_THREAD_TLS_KEYWORD absl::base_internal::ExponentialBiased
+ABSL_PER_THREAD_TLS_KEYWORD absl::profiling_internal::ExponentialBiased
     g_exponential_biased_generator;
 #endif
 

absl/debugging/BUILD.bazel

@@ -183,6 +183,7 @@ cc_library(
     ],
     copts = ABSL_DEFAULT_COPTS,
     linkopts = ABSL_DEFAULT_LINKOPTS,
+    visibility = ["//visibility:private"],
     deps = [
         "//absl/base:config",
         "//absl/base:core_headers",
@@ -197,6 +198,7 @@ cc_library(
     srcs = ["internal/demangle.cc"],
     hdrs = ["internal/demangle.h"],
     copts = ABSL_DEFAULT_COPTS,
+    visibility = ["//visibility:private"],
     deps = [
         "//absl/base",
         "//absl/base:config",

absl/profiling/BUILD.bazel

@@ -16,6 +16,7 @@ load(
     "//absl:copts/configure_copts.bzl",
     "ABSL_DEFAULT_COPTS",
     "ABSL_DEFAULT_LINKOPTS",
+    "ABSL_TEST_COPTS",
 )
 
 package(default_visibility = ["//visibility:private"])
@@ -51,3 +52,75 @@ cc_test(
         "@com_google_googletest//:gtest_main",
     ],
 )
+
+cc_library(
+    name = "exponential_biased",
+    srcs = ["internal/exponential_biased.cc"],
+    hdrs = ["internal/exponential_biased.h"],
+    linkopts = ABSL_DEFAULT_LINKOPTS,
+    visibility = [
+        "//absl:__subpackages__",
+    ],
+    deps = [
+        "//absl/base:config",
+        "//absl/base:core_headers",
+    ],
+)
+
+cc_test(
+    name = "exponential_biased_test",
+    size = "small",
+    srcs = ["internal/exponential_biased_test.cc"],
+    copts = ABSL_TEST_COPTS,
+    linkopts = ABSL_DEFAULT_LINKOPTS,
+    visibility = ["//visibility:private"],
+    deps = [
+        ":exponential_biased",
+        "//absl/strings",
+        "@com_google_googletest//:gtest_main",
+    ],
+)
+
+cc_library(
+    name = "periodic_sampler",
+    srcs = ["internal/periodic_sampler.cc"],
+    hdrs = ["internal/periodic_sampler.h"],
+    copts = ABSL_DEFAULT_COPTS,
+    linkopts = ABSL_DEFAULT_LINKOPTS,
+    visibility = [
+        "//absl:__subpackages__",
+    ],
+    deps = [
+        ":exponential_biased",
+        "//absl/base:core_headers",
+    ],
+)
+
+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 = [
+        ":periodic_sampler",
+        "//absl/base:core_headers",
+        "@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 = [
+        ":periodic_sampler",
+        "//absl/base:core_headers",
+        "@com_github_google_benchmark//:benchmark_main",
+    ],
+)

absl/profiling/CMakeLists.txt

@@ -37,3 +37,57 @@ absl_cc_test(
     GTest::gmock_main
 )
 
+absl_cc_library(
+  NAME
+    exponential_biased
+  SRCS
+    "internal/exponential_biased.cc"
+  HDRS
+    "internal/exponential_biased.h"
+  COPTS
+    ${ABSL_DEFAULT_COPTS}
+  DEPS
+    absl::config
+    absl::core_headers
+)
+
+absl_cc_test(
+  NAME
+    exponential_biased_test
+  SRCS
+    "internal/exponential_biased_test.cc"
+  COPTS
+    ${ABSL_TEST_COPTS}
+  DEPS
+    absl::exponential_biased
+    absl::strings
+    GTest::gmock_main
+)
+
+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
+    GTest::gmock_main
+)
+