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Locking system overhaul, add condition variables

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This commit simplifies the locking system: CCriticalSection becomes a
simple typedef for boost::interprocess::interprocess_recursive_mutex,
and CCriticalBlock and CTryCriticalBlock are replaced by a templated
CMutexLock, which wraps boost::interprocess::scoped_lock.

By making the lock type a template parameter, some critical sections
can now be changed to non-recursive locks, which support waiting via
condition variables. These are implemented in CWaitableCriticalSection
and WAITABLE_CRITICAL_BLOCK.

CWaitableCriticalSection is a wrapper for a different Boost mutex,
which supports waiting/notification via condition variables. This
should enable us to remove much of the used polling code. Important
is that this mutex is not recursive, so functions that perform the
locking must not call eachother.

Because boost::interprocess::scoped_lock does not support assigning
and copying, I had to revert to the older CRITICAL_BLOCK macros that
use a nested for loop instead of a simple if.
This commit is contained in:
Pieter Wuille
2012-04-02 02:40:41 +02:00
parent b0a7e05a45
commit 712fd182b7
2 changed files with 124 additions and 117 deletions
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56
src/util.cpp
View File

@@ -1193,62 +1193,14 @@ static void pop_lock()
dd_mutex.unlock();
}
void CCriticalSection::Enter(const char* pszName, const char* pszFile, int nLine)
void EnterCritical(const char* pszName, const char* pszFile, int nLine, void* cs)
{
push_lock(this, CLockLocation(pszName, pszFile, nLine));
#ifdef DEBUG_LOCKCONTENTION
bool result = mutex.try_lock();
if (!result)
{
printf("LOCKCONTENTION: %s\n", pszName);
printf("Locker: %s:%d\n", pszFile, nLine);
mutex.lock();
printf("Locked\n");
}
#else
mutex.lock();
#endif
push_lock(cs, CLockLocation(pszName, pszFile, nLine));
}
void CCriticalSection::Leave()
void LeaveCritical()
{
mutex.unlock();
pop_lock();
}
bool CCriticalSection::TryEnter(const char* pszName, const char* pszFile, int nLine)
{
push_lock(this, CLockLocation(pszName, pszFile, nLine));
bool result = mutex.try_lock();
if (!result) pop_lock();
return result;
}
#else
void CCriticalSection::Enter(const char* pszName, const char* pszFile, int nLine)
{
#ifdef DEBUG_LOCKCONTENTION
bool result = mutex.try_lock();
if (!result)
{
printf("LOCKCONTENTION: %s\n", pszName);
printf("Locker: %s:%d\n", pszFile, nLine);
mutex.lock();
}
#else
mutex.lock();
#endif
}
void CCriticalSection::Leave()
{
mutex.unlock();
}
bool CCriticalSection::TryEnter(const char*, const char*, int)
{
bool result = mutex.try_lock();
return result;
}
#endif /* DEBUG_LOCKORDER */