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//===-- StreamTee.h ------------------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef LLDB_UTILITY_STREAMTEE_H
#define LLDB_UTILITY_STREAMTEE_H
#include <climits>
#include <mutex>
#include "lldb/Utility/Stream.h"
namespace lldb_private {
class StreamTee : public Stream {
public:
StreamTee(bool colors = false)
: Stream(colors), m_streams_mutex(), m_streams() {}
StreamTee(lldb::StreamSP &stream_sp)
: Stream(), m_streams_mutex(), m_streams() {
// No need to lock mutex during construction
if (stream_sp)
m_streams.push_back(stream_sp);
}
StreamTee(lldb::StreamSP &stream_sp, lldb::StreamSP &stream_2_sp)
: Stream(), m_streams_mutex(), m_streams() {
// No need to lock mutex during construction
if (stream_sp)
m_streams.push_back(stream_sp);
if (stream_2_sp)
m_streams.push_back(stream_2_sp);
}
StreamTee(const StreamTee &rhs)
: Stream(rhs), m_streams_mutex(), m_streams() {
// Don't copy until we lock down "rhs"
std::lock_guard<std::recursive_mutex> guard(rhs.m_streams_mutex);
m_streams = rhs.m_streams;
}
~StreamTee() override = default;
StreamTee &operator=(const StreamTee &rhs) {
if (this != &rhs) {
Stream::operator=(rhs);
std::lock(m_streams_mutex, rhs.m_streams_mutex);
std::lock_guard<std::recursive_mutex> lhs_locker(m_streams_mutex,
std::adopt_lock);
std::lock_guard<std::recursive_mutex> rhs_locker(rhs.m_streams_mutex,
std::adopt_lock);
m_streams = rhs.m_streams;
}
return *this;
}
void Flush() override {
std::lock_guard<std::recursive_mutex> guard(m_streams_mutex);
collection::iterator pos, end;
for (pos = m_streams.begin(), end = m_streams.end(); pos != end; ++pos) {
// Allow for our collection to contain NULL streams. This allows the
// StreamTee to be used with hard coded indexes for clients that might
// want N total streams with only a few that are set to valid values.
Stream *strm = pos->get();
if (strm)
strm->Flush();
}
}
size_t AppendStream(const lldb::StreamSP &stream_sp) {
size_t new_idx = m_streams.size();
std::lock_guard<std::recursive_mutex> guard(m_streams_mutex);
m_streams.push_back(stream_sp);
return new_idx;
}
size_t GetNumStreams() const {
size_t result = 0;
{
std::lock_guard<std::recursive_mutex> guard(m_streams_mutex);
result = m_streams.size();
}
return result;
}
lldb::StreamSP GetStreamAtIndex(uint32_t idx) {
lldb::StreamSP stream_sp;
std::lock_guard<std::recursive_mutex> guard(m_streams_mutex);
if (idx < m_streams.size())
stream_sp = m_streams[idx];
return stream_sp;
}
void SetStreamAtIndex(uint32_t idx, const lldb::StreamSP &stream_sp) {
std::lock_guard<std::recursive_mutex> guard(m_streams_mutex);
// Resize our stream vector as necessary to fit as many streams as needed.
// This also allows this class to be used with hard coded indexes that can
// be used contain many streams, not all of which are valid.
if (idx >= m_streams.size())
m_streams.resize(idx + 1);
m_streams[idx] = stream_sp;
}
protected:
typedef std::vector<lldb::StreamSP> collection;
mutable std::recursive_mutex m_streams_mutex;
collection m_streams;
size_t WriteImpl(const void *s, size_t length) override {
std::lock_guard<std::recursive_mutex> guard(m_streams_mutex);
if (m_streams.empty())
return 0;
size_t min_bytes_written = SIZE_MAX;
collection::iterator pos, end;
for (pos = m_streams.begin(), end = m_streams.end(); pos != end; ++pos) {
// Allow for our collection to contain NULL streams. This allows the
// StreamTee to be used with hard coded indexes for clients that might
// want N total streams with only a few that are set to valid values.
Stream *strm = pos->get();
if (strm) {
const size_t bytes_written = strm->Write(s, length);
if (min_bytes_written > bytes_written)
min_bytes_written = bytes_written;
}
}
if (min_bytes_written == SIZE_MAX)
return 0;
return min_bytes_written;
}
};
} // namespace lldb_private
#endif // LLDB_UTILITY_STREAMTEE_H
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