72 lines
2.3 KiB
C++
72 lines
2.3 KiB
C++
// Copyright 2017 The Abseil Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include <stdlib.h>
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#include <string.h>
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#include "absl/base/dynamic_annotations.h"
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// Compiler-based ThreadSanitizer defines
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// DYNAMIC_ANNOTATIONS_EXTERNAL_IMPL = 1
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// and provides its own definitions of the functions.
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#ifndef DYNAMIC_ANNOTATIONS_EXTERNAL_IMPL
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# define DYNAMIC_ANNOTATIONS_EXTERNAL_IMPL 0
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#endif
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#if DYNAMIC_ANNOTATIONS_EXTERNAL_IMPL == 0 && !defined(__native_client__)
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extern "C" {
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static int GetRunningOnValgrind(void) {
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#ifdef RUNNING_ON_VALGRIND
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if (RUNNING_ON_VALGRIND) return 1;
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#endif
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char *running_on_valgrind_str = getenv("RUNNING_ON_VALGRIND");
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if (running_on_valgrind_str) {
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return strcmp(running_on_valgrind_str, "0") != 0;
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}
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return 0;
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}
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// See the comments in dynamic_annotations.h
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int RunningOnValgrind(void) {
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static volatile int running_on_valgrind = -1;
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int local_running_on_valgrind = running_on_valgrind;
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// C doesn't have thread-safe initialization of statics, and we
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// don't want to depend on pthread_once here, so hack it.
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ANNOTATE_BENIGN_RACE(&running_on_valgrind, "safe hack");
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if (local_running_on_valgrind == -1)
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running_on_valgrind = local_running_on_valgrind = GetRunningOnValgrind();
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return local_running_on_valgrind;
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}
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// See the comments in dynamic_annotations.h
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double ValgrindSlowdown(void) {
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// Same initialization hack as in RunningOnValgrind().
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static volatile double slowdown = 0.0;
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double local_slowdown = slowdown;
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ANNOTATE_BENIGN_RACE(&slowdown, "safe hack");
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if (RunningOnValgrind() == 0) {
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return 1.0;
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}
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if (local_slowdown == 0.0) {
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char *env = getenv("VALGRIND_SLOWDOWN");
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slowdown = local_slowdown = env ? atof(env) : 50.0;
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}
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return local_slowdown;
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}
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} // extern "C"
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#endif // DYNAMIC_ANNOTATIONS_EXTERNAL_IMPL == 0
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