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Use semaphores instead of condition variables

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This commit is contained in:
Pieter Wuille 2012-05-10 18:44:07 +02:00
parent 2692ed3f01
commit c59abe2589
3 changed files with 91 additions and 47 deletions
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66
src/net.cpp
View file

@ -35,7 +35,7 @@ void ThreadOpenAddedConnections2(void* parg);
void ThreadMapPort2(void* parg);
#endif
void ThreadDNSAddressSeed2(void* parg);
bool OpenNetworkConnection(const CAddress& addrConnect, const char *strDest = NULL, bool fOneShot = false);
bool OpenNetworkConnection(const CAddress& addrConnect, CSemaphoreGrant *grantOutbound = NULL, const char *strDest = NULL, bool fOneShot = false);
@ -66,10 +66,7 @@ CCriticalSection cs_vOneShots;
set<CNetAddr> setservAddNodeAddresses;
CCriticalSection cs_setservAddNodeAddresses;
static CWaitableCriticalSection csOutbound;
static int nOutbound = 0;
static CConditionVariable condOutbound;
static CSemaphore *semOutbound = NULL;
void AddOneShot(string strDest)
{
@ -463,10 +460,6 @@ CNode* ConnectNode(CAddress addrConnect, const char *pszDest, int64 nTimeout)
LOCK(cs_vNodes);
vNodes.push_back(pnode);
}
{
WAITABLE_LOCK(csOutbound);
nOutbound++;
}
pnode->nTimeConnected = GetTime();
return pnode;
@ -612,14 +605,8 @@ void ThreadSocketHandler2(void* parg)
// remove from vNodes
vNodes.erase(remove(vNodes.begin(), vNodes.end(), pnode), vNodes.end());
if (!pnode->fInbound)
{
WAITABLE_LOCK(csOutbound);
nOutbound--;
// Connection slot(s) were removed, notify connection creator(s)
NOTIFY(condOutbound);
}
// release outbound grant (if any)
pnode->grantOutbound.Release();
// close socket and cleanup
pnode->CloseSocketDisconnect();
@ -1295,8 +1282,11 @@ void static ProcessOneShot()
vOneShots.pop_front();
}
CAddress addr;
if (!OpenNetworkConnection(addr, strDest.c_str(), true))
AddOneShot(strDest);
CSemaphoreGrant grant(*semOutbound, true);
if (grant) {
if (!OpenNetworkConnection(addr, &grant, strDest.c_str(), true))
AddOneShot(strDest);
}
}
void ThreadOpenConnections2(void* parg)
@ -1312,7 +1302,7 @@ void ThreadOpenConnections2(void* parg)
BOOST_FOREACH(string strAddr, mapMultiArgs["-connect"])
{
CAddress addr;
OpenNetworkConnection(addr, strAddr.c_str());
OpenNetworkConnection(addr, NULL, strAddr.c_str());
for (int i = 0; i < 10 && i < nLoop; i++)
{
Sleep(500);
@ -1335,13 +1325,9 @@ void ThreadOpenConnections2(void* parg)
if (fShutdown)
return;
// Limit outbound connections
int nMaxOutbound = min(MAX_OUTBOUND_CONNECTIONS, (int)GetArg("-maxconnections", 125));
vnThreadsRunning[THREAD_OPENCONNECTIONS]--;
{
WAITABLE_LOCK(csOutbound);
WAIT(condOutbound, fShutdown || nOutbound < nMaxOutbound);
}
CSemaphoreGrant grant(*semOutbound);
vnThreadsRunning[THREAD_OPENCONNECTIONS]++;
if (fShutdown)
return;
@ -1374,11 +1360,15 @@ void ThreadOpenConnections2(void* parg)
// Only connect to one address per a.b.?.? range.
// Do this here so we don't have to critsect vNodes inside mapAddresses critsect.
int nOutbound = 0;
set<vector<unsigned char> > setConnected;
{
LOCK(cs_vNodes);
BOOST_FOREACH(CNode* pnode, vNodes)
BOOST_FOREACH(CNode* pnode, vNodes) {
setConnected.insert(pnode->addr.GetGroup());
if (!pnode->fInbound)
nOutbound++;
}
}
int64 nANow = GetAdjustedTime();
@ -1408,7 +1398,7 @@ void ThreadOpenConnections2(void* parg)
}
if (addrConnect.IsValid())
OpenNetworkConnection(addrConnect);
OpenNetworkConnection(addrConnect, &grant);
}
}
@ -1442,7 +1432,8 @@ void ThreadOpenAddedConnections2(void* parg)
while(!fShutdown) {
BOOST_FOREACH(string& strAddNode, mapMultiArgs["-addnode"]) {
CAddress addr;
OpenNetworkConnection(addr, strAddNode.c_str());
CSemaphoreGrant grant(*semOutbound);
OpenNetworkConnection(addr, &grant, strAddNode.c_str());
Sleep(500);
}
vnThreadsRunning[THREAD_ADDEDCONNECTIONS]--;
@ -1485,7 +1476,8 @@ void ThreadOpenAddedConnections2(void* parg)
}
BOOST_FOREACH(vector<CService>& vserv, vservConnectAddresses)
{
OpenNetworkConnection(CAddress(*(vserv.begin())));
CSemaphoreGrant grant(*semOutbound);
OpenNetworkConnection(CAddress(*(vserv.begin())), &grant);
Sleep(500);
if (fShutdown)
return;
@ -1500,7 +1492,8 @@ void ThreadOpenAddedConnections2(void* parg)
}
}
bool OpenNetworkConnection(const CAddress& addrConnect, const char *strDest, bool fOneShot)
// if succesful, this moves the passed grant to the constructed node
bool OpenNetworkConnection(const CAddress& addrConnect, CSemaphoreGrant *grantOutbound, const char *strDest, bool fOneShot)
{
//
// Initiate outbound network connection
@ -1522,6 +1515,8 @@ bool OpenNetworkConnection(const CAddress& addrConnect, const char *strDest, boo
return false;
if (!pnode)
return false;
if (grantOutbound)
grantOutbound->MoveTo(pnode->grantOutbound);
pnode->fNetworkNode = true;
if (fOneShot)
pnode->fOneShot = true;
@ -1770,6 +1765,12 @@ void StartNode(void* parg)
#endif
#endif
if (semOutbound == NULL) {
// initialize semaphore
int nMaxOutbound = min(MAX_OUTBOUND_CONNECTIONS, (int)GetArg("-maxconnections", 125));
semOutbound = new CSemaphore(nMaxOutbound);
}
if (pnodeLocalHost == NULL)
pnodeLocalHost = new CNode(INVALID_SOCKET, CAddress(CService("127.0.0.1", 0), nLocalServices));
@ -1823,7 +1824,8 @@ bool StopNode()
fShutdown = true;
nTransactionsUpdated++;
int64 nStart = GetTime();
NOTIFY_ALL(condOutbound);
for (int i=0; i<MAX_OUTBOUND_CONNECTIONS; i++)
semOutbound->post();
do
{
int nThreadsRunning = 0;

1
src/net.h
View file

@ -147,6 +147,7 @@ public:
bool fNetworkNode;
bool fSuccessfullyConnected;
bool fDisconnect;
CSemaphoreGrant grantOutbound;
protected:
int nRefCount;

71
src/util.h
View file

@ -23,7 +23,7 @@ typedef int pid_t; /* define for windows compatiblity */
#include <boost/filesystem/path.hpp>
#include <boost/interprocess/sync/interprocess_recursive_mutex.hpp>
#include <boost/interprocess/sync/scoped_lock.hpp>
#include <boost/interprocess/sync/interprocess_condition.hpp>
#include <boost/interprocess/sync/interprocess_semaphore.hpp>
#include <boost/interprocess/sync/lock_options.hpp>
#include <boost/date_time/gregorian/gregorian_types.hpp>
#include <boost/date_time/posix_time/posix_time_types.hpp>
@ -275,24 +275,10 @@ public:
};
typedef CMutexLock<CCriticalSection> CCriticalBlock;
typedef CMutexLock<CWaitableCriticalSection> CWaitableCriticalBlock;
typedef boost::interprocess::interprocess_condition CConditionVariable;
/** Wait for a given condition inside a WAITABLE_CRITICAL_BLOCK */
#define WAIT(name,condition) \
do { while(!(condition)) { (name).wait(waitablecriticalblock.GetLock()); } } while(0)
/** Notify waiting threads that a condition may hold now */
#define NOTIFY(name) \
do { (name).notify_one(); } while(0)
#define NOTIFY_ALL(name) \
do { (name).notify_all(); } while(0)
#define LOCK(cs) CCriticalBlock criticalblock(cs, #cs, __FILE__, __LINE__)
#define LOCK2(cs1,cs2) CCriticalBlock criticalblock1(cs1, #cs1, __FILE__, __LINE__),criticalblock2(cs2, #cs2, __FILE__, __LINE__)
#define TRY_LOCK(cs,name) CCriticalBlock name(cs, #cs, __FILE__, __LINE__, true)
#define WAITABLE_LOCK(cs) CWaitableCriticalBlock waitablecriticalblock(cs, #cs, __FILE__, __LINE__)
#define ENTER_CRITICAL_SECTION(cs) \
{ \
@ -306,6 +292,61 @@ typedef boost::interprocess::interprocess_condition CConditionVariable;
LeaveCritical(); \
}
typedef boost::interprocess::interprocess_semaphore CSemaphore;
/** RAII-style semaphore lock */
class CSemaphoreGrant
{
private:
CSemaphore *sem;
bool fHaveGrant;
public:
void Acquire() {
if (fHaveGrant)
return;
sem->wait();
fHaveGrant = true;
}
void Release() {
if (!fHaveGrant)
return;
sem->post();
fHaveGrant = false;
}
bool TryAcquire() {
if (!fHaveGrant && sem->try_wait())
fHaveGrant = true;
return fHaveGrant;
}
void MoveTo(CSemaphoreGrant &grant) {
grant.Release();
grant.sem = sem;
grant.fHaveGrant = fHaveGrant;
sem = NULL;
fHaveGrant = false;
}
CSemaphoreGrant() : sem(NULL), fHaveGrant(false) {}
CSemaphoreGrant(CSemaphore &sema, bool fTry = false) : sem(&sema), fHaveGrant(false) {
if (fTry)
TryAcquire();
else
Acquire();
}
~CSemaphoreGrant() {
Release();
}
operator bool() {
return fHaveGrant;
}
};
inline std::string i64tostr(int64 n)
{