zig std.debug.write 调用链

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std.debug.print()
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├── std.debug.lockStderr()
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│   ├── Io.lockStderr()
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│   │   ├── Threaded.lockStderr()
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│   │   Threaded.initLockedStderr()
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│   Io.LockedStderr.clear()
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├── Io.Writer.print()
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│   ├── Io.Writer.writeAll()
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│   │   Io.Writer.write()
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│   Io.Writer.printValue()
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│   Io.Writer.writeAll()
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std.debug.unlockStderr()
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├── Io.unlockStderr()
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Threaded.unlockStderr()
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├── Io.Writer.flush()
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│   Writer.defaultFlush()
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│   File.Writer.drain()
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│   File.Writer.drainStreaming()
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│   File.writeStreaming()
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│   Io.operate()
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│   Threaded.operate()
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│   Threaded.fileWriteStreaming()
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│   posix.system.writev() # 这里调用 macos 平台函数
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mutexUnlock()