solarmutex.cxx

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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 *   Licensed to the Apache Software Foundation (ASF) under one or more
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#include <sal/config.h>
 
#include <comphelper/solarmutex.hxx>
#include <osl/thread.hxx>
 
#include <assert.h>
#include <cstdlib>
 
namespace comphelper {
 
namespace {
    SolarMutex* g_pSolarMutex = nullptr;
}
 
SolarMutex *SolarMutex::get()
{
    return g_pSolarMutex;
}
 
SolarMutex::SolarMutex()
    : m_nCount( 0 )
    , m_aBeforeReleaseHandler( nullptr )
{
    assert(!g_pSolarMutex);
    g_pSolarMutex = this;
}
 
SolarMutex::~SolarMutex()
{
    g_pSolarMutex = nullptr;
}
 
void SolarMutex::doAcquire( const sal_uInt32 nLockCount )
{
    for ( sal_uInt32 n = nLockCount; n ; --n )
        m_aMutex.acquire();
    m_nThreadId = std::this_thread::get_id();
    m_nCount += nLockCount;
}
 
sal_uInt32 SolarMutex::doRelease( bool bUnlockAll )
{
    if ( !IsCurrentThread() )
        std::abort();
    if ( m_nCount == 0 )
        std::abort();
 
    const sal_uInt32 nCount = bUnlockAll ? m_nCount : 1;
    m_nCount -= nCount;
 
    if ( 0 == m_nCount )
    {
        if ( m_aBeforeReleaseHandler )
            m_aBeforeReleaseHandler();
        m_nThreadId = std::thread::id();
    }
 
    for ( sal_uInt32 n = nCount ; n ; --n )
        m_aMutex.release();
 
    return nCount;
}
 
bool SolarMutex::IsCurrentThread() const
{
    return m_nThreadId == std::this_thread::get_id();
}
 
bool SolarMutex::tryToAcquire()
{
    if ( m_aMutex.tryToAcquire() )
    {
        m_nThreadId = std::this_thread::get_id();
        m_nCount++;
        return true;
    }
    else
        return false;
}
 
} // namespace comphelper
 
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