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dd24d8e71f
Emitting a signpost for the first time can trigger lazy setup of the logging system, and doing this in the wrong context can cause deadlocks. Check to see if the logging system is already set up, and only emit signposts if it has been to avoid triggering this. As it's hard to determine if the "is it set up?" function is available in the SDK we're building against, only do this in OS builds, as it's not particularly useful in local builds. rdar://124620772
47 lines
1.2 KiB
C++
47 lines
1.2 KiB
C++
//===--- Tracing.cpp - Support code for runtime tracing ------------*- C++ -*-//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2021 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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//
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// Support code for tracing events in the Swift runtime
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//
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//===----------------------------------------------------------------------===//
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#include "Tracing.h"
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#if SWIFT_STDLIB_TRACING
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#define SWIFT_LOG_SUBSYSTEM "com.apple.swift"
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#define SWIFT_LOG_SECTION_SCAN_CATEGORY "SectionScan"
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namespace swift {
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namespace runtime {
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namespace trace {
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os_log_t ScanLog;
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swift::once_t LogsToken;
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bool TracingEnabled;
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void setupLogs(void *unused) {
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if (!shouldEnableTracing()) {
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TracingEnabled = false;
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return;
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}
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TracingEnabled = true;
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ScanLog = os_log_create(SWIFT_LOG_SUBSYSTEM, SWIFT_LOG_SECTION_SCAN_CATEGORY);
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}
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} // namespace trace
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} // namespace runtime
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} // namespace swift
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#endif
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