tdf#137544 reduce cost of SolarMutex checking

the  std::thread::id facilities are cheaper than the sal versions

Change-Id: I5ccb7e54f3a1e4d715338faa1e9c0aae9449e46d
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/136800
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

comphelper/source/misc/solarmutex.cxx

@@ -38,7 +38,6 @@ SolarMutex *SolarMutex::get()
 
 SolarMutex::SolarMutex()
     : m_nCount( 0 )
-    , m_nThreadId( 0 )
     , m_aBeforeReleaseHandler( nullptr )
 {
     assert(!g_pSolarMutex);
@@ -54,7 +53,7 @@ void SolarMutex::doAcquire( const sal_uInt32 nLockCount )
 {
     for ( sal_uInt32 n = nLockCount; n ; --n )
         m_aMutex.acquire();
-    m_nThreadId = osl::Thread::getCurrentIdentifier();
+    m_nThreadId = std::this_thread::get_id();
     m_nCount += nLockCount;
 }
 
@@ -72,7 +71,7 @@ sal_uInt32 SolarMutex::doRelease( bool bUnlockAll )
     {
         if ( m_aBeforeReleaseHandler )
             m_aBeforeReleaseHandler();
-        m_nThreadId = 0;
+        m_nThreadId = std::thread::id();
     }
 
     for ( sal_uInt32 n = nCount ; n ; --n )
@@ -83,14 +82,14 @@ sal_uInt32 SolarMutex::doRelease( bool bUnlockAll )
 
 bool SolarMutex::IsCurrentThread() const
 {
-    return m_nThreadId == osl::Thread::getCurrentIdentifier();
+    return m_nThreadId == std::this_thread::get_id();
 }
 
 bool SolarMutex::tryToAcquire()
 {
     if ( m_aMutex.tryToAcquire() )
     {
-        m_nThreadId = osl::Thread::getCurrentIdentifier();
+        m_nThreadId = std::this_thread::get_id();
         m_nCount++;
         return true;
     }

include/comphelper/solarmutex.hxx

@@ -24,8 +24,8 @@
 
 #include <assert.h>
 #include <atomic>
+#include <thread>
 
-#include <osl/thread.h>
 #include <osl/mutex.hxx>
 #include <comphelper/comphelperdllapi.h>
 
@@ -72,7 +72,7 @@ protected:
     sal_uInt32            m_nCount;
 
 private:
-    std::atomic<oslThreadIdentifier> m_nThreadId;
+    std::atomic<std::thread::id> m_nThreadId;
 
     SolarMutex(const SolarMutex&) = delete;
     SolarMutex& operator=(const SolarMutex&) = delete;