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Make critical sections initialization really thread-safe.

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@61419 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Vadim Zeitlin
2009-07-12 17:22:50 +00:00
parent 24723aa565
commit d5e7d2ec11
1 changed files with 24 additions and 24 deletions
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48
src/common/log.cpp
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@@ -77,35 +77,35 @@ namespace
typedef wxVector<wxLogRecord> wxLogRecords;
wxLogRecords gs_bufferedLogRecords;
// define static functions providing access to the critical sections we use
// instead of just using static critical section variables as log functions may
// be used during static initialization and while this is certainly not
// advisable it's still better to not crash (as we'd do if we used a yet
// uninitialized critical section) if it happens
// this macro allows to define an object which will be initialized before any
// other function in this file is called: this is necessary to allow log
// functions to be used during static initialization (this is not advisable
// anyhow but we should at least try to not crash) and to also ensure that they
// are initialized by the time static initialization is done, i.e. before any
// threads are created hopefully
//
// the net effect of all this is that you can use Get##name##CS() function to
// access the critical function without worrying about it being not initialized
//
// see also WX_DEFINE_GLOBAL_CONV2() in src/common/strconv.cpp
#define WX_DEFINE_LOG_CS(name) \
inline wxCriticalSection& Get##name##CS() \
{ \
static wxCriticalSection s_cs##name; \
return s_cs##name; \
} \
\
wxCriticalSection *gs_##name##CSPtr = &Get##name##CS()
// this critical section is used for buffering the messages from threads other
// than main, i.e. it protects all accesses to gs_bufferedLogRecords above
inline wxCriticalSection& GetBackgroundLogCS()
{
static wxCriticalSection s_csBackground;
WX_DEFINE_LOG_CS(BackgroundLog);
return s_csBackground;
}
// this one is used for protecting ms_aTraceMasks from concurrent access
WX_DEFINE_LOG_CS(TraceMask);
inline wxCriticalSection& GetTraceMaskCS()
{
static wxCriticalSection s_csTrace;
return s_csTrace;
}
inline wxCriticalSection& GetLevelsCS()
{
static wxCriticalSection s_csLevels;
return s_csLevels;
}
// and this one is used for gs_componentLevels
WX_DEFINE_LOG_CS(Levels);
} // anonymous namespace