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authorVincent Ambo <tazjin@google.com>2020-05-20T01·32+0100
committerVincent Ambo <tazjin@google.com>2020-05-20T01·32+0100
commitfc8dc48020ac5b52731d0828a96ea4d2526c77ba (patch)
tree353204eea3268095a9ad3f5345720f32c2615c69 /third_party/abseil_cpp/absl/base/internal/spinlock_akaros.inc
parentffb2ae54beb5796cd408fbe15d2d2da09ff37adf (diff)
parent768eb2ca2857342673fcd462792ce04b8bac3fa3 (diff)
Add 'third_party/abseil_cpp/' from commit '768eb2ca2857342673fcd462792ce04b8bac3fa3' r/781
git-subtree-dir: third_party/abseil_cpp
git-subtree-mainline: ffb2ae54beb5796cd408fbe15d2d2da09ff37adf
git-subtree-split: 768eb2ca2857342673fcd462792ce04b8bac3fa3
Diffstat (limited to 'third_party/abseil_cpp/absl/base/internal/spinlock_akaros.inc')
-rw-r--r--third_party/abseil_cpp/absl/base/internal/spinlock_akaros.inc35
1 files changed, 35 insertions, 0 deletions
diff --git a/third_party/abseil_cpp/absl/base/internal/spinlock_akaros.inc b/third_party/abseil_cpp/absl/base/internal/spinlock_akaros.inc
new file mode 100644
index 000000000000..bc468940fc5d
--- /dev/null
+++ b/third_party/abseil_cpp/absl/base/internal/spinlock_akaros.inc
@@ -0,0 +1,35 @@
+// Copyright 2017 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.
+//
+// This file is an Akaros-specific part of spinlock_wait.cc
+
+#include <atomic>
+
+#include "absl/base/internal/scheduling_mode.h"
+
+extern "C" {
+
+ABSL_ATTRIBUTE_WEAK void AbslInternalSpinLockDelay(
+    std::atomic<uint32_t>* /* lock_word */, uint32_t /* value */,
+    int /* loop */, absl::base_internal::SchedulingMode /* mode */) {
+  // In Akaros, one must take care not to call anything that could cause a
+  // malloc(), a blocking system call, or a uthread_yield() while holding a
+  // spinlock. Our callers assume will not call into libraries or other
+  // arbitrary code.
+}
+
+ABSL_ATTRIBUTE_WEAK void AbslInternalSpinLockWake(
+    std::atomic<uint32_t>* /* lock_word */, bool /* all */) {}
+
+}  // extern "C"