45b80c69ad
This is used by the Java trace wrappers to avoid JNI overhead when trace tags are disabled. Also added a new tag for the input subsystem and view hierarchy. Change-Id: Ia04a507e42a37b1d3bbb19859e6c07a92f4fe9aa
50 lines
1.6 KiB
C++
50 lines
1.6 KiB
C++
/*
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* Copyright (C) 2012 The Android Open Source Project
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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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* http://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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*/
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#include <cutils/properties.h>
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#include <utils/Log.h>
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#include <utils/Trace.h>
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namespace android {
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volatile int32_t Tracer::sIsReady = 0;
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int Tracer::sTraceFD = -1;
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uint64_t Tracer::sEnabledTags = 0;
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Mutex Tracer::sMutex;
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void Tracer::init() {
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Mutex::Autolock lock(sMutex);
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if (!sIsReady) {
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const char* const traceFileName =
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"/sys/kernel/debug/tracing/trace_marker";
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sTraceFD = open(traceFileName, O_WRONLY);
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if (sTraceFD == -1) {
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ALOGE("error opening trace file: %s (%d)", strerror(errno), errno);
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// sEnabledTags remains zero indicating that no tracing can occur
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} else {
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char value[PROPERTY_VALUE_MAX];
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property_get("atrace.tags.enableflags", value, "0");
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sEnabledTags = (strtoll(value, NULL, 0) & ATRACE_TAG_VALID_MASK)
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| ATRACE_TAG_ALWAYS;
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}
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android_atomic_release_store(1, &sIsReady);
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}
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}
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} // namespace andoid
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