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--
b8e6b64b604449bb51ed0ba8e9439097f3aa8773 by Abseil Team <absl-team@google.com>:

fix typo 'implentation' -> 'implementation'

PiperOrigin-RevId: 311623471

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2b9262a311f3329c8006835a79498edd90568acd by Matt Kulukundis <kfm@google.com>:

Internal cleanup

PiperOrigin-RevId: 311549039

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7507ed3c28113e28f993aa634bd44a9a0d4c4a2c by Derek Mauro <dmauro@google.com>:

Delete LinkerInitialized

Now that all SpinLocks have the same scheduling mode for
their entire lives, the scheduling mode does not need to
be re-tested in the loop in LockSlow.

PiperOrigin-RevId: 311521474

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abf5fae67e21b38cda4083aaafd7012e2c6fbb7d by Andy Getzendanner <durandal@google.com>:

Fix public target name of the random library

Import of https://github.com/abseil/abseil-cpp/pull/684

PiperOrigin-RevId: 311429555
GitOrigin-RevId: b8e6b64b604449bb51ed0ba8e9439097f3aa8773
Change-Id: Ic48f671846bda059cc46f4a0b967cc3b1a733ba0
This commit is contained in:
Abseil Team 2020-05-14 16:04:20 -07:00 • committed by Andy Getz
parent f2bc9d11e8
commit d118d4bb11
6 changed files with 14 additions and 95 deletions
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20
absl/synchronization/internal/mutex_nonprod.inc
View file

@ -209,31 +209,22 @@ class SynchronizationStorage {
// Instances allocated on the heap or on the stack should use the default
// constructor.
SynchronizationStorage()
: is_dynamic_(true), once_() {}
// Instances allocated in static storage (not on the heap, not on the
// stack) should use this constructor.
explicit SynchronizationStorage(base_internal::LinkerInitialized) {}
: destruct_(true), once_() {}
constexpr explicit SynchronizationStorage(absl::ConstInitType)
: is_dynamic_(false), once_(), space_{{0}} {}
: destruct_(false), once_(), space_{{0}} {}
SynchronizationStorage(SynchronizationStorage&) = delete;
SynchronizationStorage& operator=(SynchronizationStorage&) = delete;
~SynchronizationStorage() {
if (is_dynamic_) {
if (destruct_) {
get()->~T();
}
}
// Retrieve the object in storage. This is fast and thread safe, but does
// incur the cost of absl::call_once().
//
// For instances in static storage constructed with the
// LinkerInitialized constructor, may be called at any time without
// regard for order of dynamic initialization or destruction of objects
// in static storage. See the class comment for caveats.
T* get() {
absl::call_once(once_, SynchronizationStorage::Construct, this);
return reinterpret_cast<T*>(&space_);
@ -245,10 +236,7 @@ class SynchronizationStorage {
}
// When true, T's destructor is run when this is destructed.
//
// The LinkerInitialized constructor assumes this value will be set
// false by static initialization.
bool is_dynamic_;
const bool destruct_;
absl::once_flag once_;