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/*
* SRT - Secure, Reliable, Transport
* Copyright (c) 2018 Haivision Systems Inc.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
*/
#include "verbose.hpp"
#include "sync.h" // srt::sync
namespace Verbose
{
bool on = false;
std::ostream* cverb = &std::cerr;
srt::sync::Mutex vlock;
Log& Log::operator<<(LogNoEol)
{
noeol = true;
if (on)
{
(*cverb) << std::flush;
}
return *this;
}
Log& Log::operator<<(LogLock)
{
lockline = true;
return *this;
}
Log::~Log()
{
if (on && !noeol)
{
if (lockline)
{
// Lock explicitly, as requested, and wait for the opportunity.
vlock.lock();
}
else if (vlock.try_lock())
{
// Successfully locked, so unlock immediately, locking wasn't requested.
vlock.unlock();
}
else
{
// Failed to lock, which means that some other thread has locked it first.
// This means that some other thread wants to print the whole line and doesn't
// want to be disturbed during this process. Lock the thread then as this is
// the only way to wait until it's unlocked. However, do not block your printing
// with locking, because you were not requested to lock (treat this mutex as
// an entry semaphore, which may only occasionally block the whole line).
vlock.lock();
vlock.unlock();
}
(*cverb) << std::endl;
// If lockline is set, the lock was requested and WAS DONE, so unlock.
// Otherwise locking WAS NOT DONE.
if (lockline)
vlock.unlock();
}
}
}
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