Split synchronization mechanisms from util.{h,cpp}

bitcoin-qt.pro

@@ -109,6 +109,7 @@ HEADERS += src/qt/bitcoingui.h \
     src/bignum.h \
     src/checkpoints.h \
     src/compat.h \
+    src/sync.h \
     src/util.h \
     src/uint256.h \
     src/serialize.h \
@@ -172,6 +173,7 @@ SOURCES += src/qt/bitcoin.cpp src/qt/bitcoingui.cpp \
     src/qt/editaddressdialog.cpp \
     src/qt/bitcoinaddressvalidator.cpp \
     src/version.cpp \
+    src/sync.cpp \
     src/util.cpp \
     src/netbase.cpp \
     src/key.cpp \

src/addrman.h

@@ -7,6 +7,7 @@
 #include "netbase.h"
 #include "protocol.h"
 #include "util.h"
+#include "sync.h"
 
 
 #include <map>

src/keystore.h

@@ -6,7 +6,7 @@
 #define BITCOIN_KEYSTORE_H
 
 #include "crypter.h"
-#include "util.h"
+#include "sync.h"
 #include "base58.h"
 
 class CScript;

src/main.h

@@ -6,6 +6,7 @@
 #define BITCOIN_MAIN_H
 
 #include "bignum.h"
+#include "sync.h"
 #include "net.h"
 #include "script.h"
 

src/makefile.linux-mingw

@@ -61,6 +61,7 @@ OBJS= \
     obj/bitcoinrpc.o \
     obj/rpcdump.o \
     obj/script.o \
+    obj/sync.o \
     obj/util.o \
     obj/wallet.o \
     obj/walletdb.o \

src/makefile.mingw

@@ -58,6 +58,7 @@ OBJS= \
     obj/bitcoinrpc.o \
     obj/rpcdump.o \
     obj/script.o \
+    obj/sync.o \
     obj/util.o \
     obj/wallet.o \
     obj/walletdb.o \

src/makefile.osx

@@ -85,6 +85,7 @@ OBJS= \
     obj/bitcoinrpc.o \
     obj/rpcdump.o \
     obj/script.o \
+    obj/sync.o \
     obj/util.o \
     obj/wallet.o \
     obj/walletdb.o \

src/makefile.unix

@@ -102,6 +102,7 @@ OBJS= \
     obj/bitcoinrpc.o \
     obj/rpcdump.o \
     obj/script.o \
+    obj/sync.o \
     obj/util.o \
     obj/wallet.o \
     obj/walletdb.o \

src/qt/messagepage.cpp

@@ -10,7 +10,6 @@
 #include "main.h"
 #include "wallet.h"
 #include "init.h"
-#include "util.h"
 
 #include "messagepage.h"
 #include "ui_messagepage.h"

src/qt/qtipcserver.cpp

@@ -8,7 +8,6 @@
 #include <boost/date_time/posix_time/posix_time.hpp>
 
 #include "ui_interface.h"
-#include "util.h"
 #include "qtipcserver.h"
 
 using namespace boost::interprocess;

src/sync.cpp

@@ -0,0 +1,119 @@
+// Copyright (c) 2011-2012 The Bitcoin developers
+// Distributed under the MIT/X11 software license, see the accompanying
+// file license.txt or http://www.opensource.org/licenses/mit-license.php.
+
+#include "sync.h"
+
+
+
+#ifdef DEBUG_LOCKORDER
+//
+// Early deadlock detection.
+// Problem being solved:
+//    Thread 1 locks  A, then B, then C
+//    Thread 2 locks  D, then C, then A
+//     --> may result in deadlock between the two threads, depending on when they run.
+// Solution implemented here:
+// Keep track of pairs of locks: (A before B), (A before C), etc.
+// Complain if any thread trys to lock in a different order.
+//
+
+struct CLockLocation
+{
+    CLockLocation(const char* pszName, const char* pszFile, int nLine)
+    {
+        mutexName = pszName;
+        sourceFile = pszFile;
+        sourceLine = nLine;
+    }
+
+    std::string ToString() const
+    {
+        return mutexName+"  "+sourceFile+":"+itostr(sourceLine);
+    }
+
+private:
+    std::string mutexName;
+    std::string sourceFile;
+    int sourceLine;
+};
+
+typedef std::vector< std::pair<void*, CLockLocation> > LockStack;
+
+static boost::interprocess::interprocess_mutex dd_mutex;
+static std::map<std::pair<void*, void*>, LockStack> lockorders;
+static boost::thread_specific_ptr<LockStack> lockstack;
+
+
+static void potential_deadlock_detected(const std::pair<void*, void*>& mismatch, const LockStack& s1, const LockStack& s2)
+{
+    printf("POTENTIAL DEADLOCK DETECTED\n");
+    printf("Previous lock order was:\n");
+    BOOST_FOREACH(const PAIRTYPE(void*, CLockLocation)& i, s2)
+    {
+        if (i.first == mismatch.first) printf(" (1)");
+        if (i.first == mismatch.second) printf(" (2)");
+        printf(" %s\n", i.second.ToString().c_str());
+    }
+    printf("Current lock order is:\n");
+    BOOST_FOREACH(const PAIRTYPE(void*, CLockLocation)& i, s1)
+    {
+        if (i.first == mismatch.first) printf(" (1)");
+        if (i.first == mismatch.second) printf(" (2)");
+        printf(" %s\n", i.second.ToString().c_str());
+    }
+}
+
+static void push_lock(void* c, const CLockLocation& locklocation, bool fTry)
+{
+    bool fOrderOK = true;
+    if (lockstack.get() == NULL)
+        lockstack.reset(new LockStack);
+
+    if (fDebug) printf("Locking: %s\n", locklocation.ToString().c_str());
+    dd_mutex.lock();
+
+    (*lockstack).push_back(std::make_pair(c, locklocation));
+
+    if (!fTry) BOOST_FOREACH(const PAIRTYPE(void*, CLockLocation)& i, (*lockstack))
+    {
+        if (i.first == c) break;
+
+        std::pair<void*, void*> p1 = std::make_pair(i.first, c);
+        if (lockorders.count(p1))
+            continue;
+        lockorders[p1] = (*lockstack);
+
+        std::pair<void*, void*> p2 = std::make_pair(c, i.first);
+        if (lockorders.count(p2))
+        {
+            potential_deadlock_detected(p1, lockorders[p2], lockorders[p1]);
+            break;
+        }
+    }
+    dd_mutex.unlock();
+}
+
+static void pop_lock()
+{
+    if (fDebug) 
+    {
+        const CLockLocation& locklocation = (*lockstack).rbegin()->second;
+        printf("Unlocked: %s\n", locklocation.ToString().c_str());
+    }
+    dd_mutex.lock();
+    (*lockstack).pop_back();
+    dd_mutex.unlock();
+}
+
+void EnterCritical(const char* pszName, const char* pszFile, int nLine, void* cs, bool fTry)
+{
+    push_lock(cs, CLockLocation(pszName, pszFile, nLine), fTry);
+}
+
+void LeaveCritical()
+{
+    pop_lock();
+}
+
+#endif /* DEBUG_LOCKORDER */

src/sync.h

@@ -0,0 +1,216 @@
+// Copyright (c) 2009-2010 Satoshi Nakamoto
+// Copyright (c) 2009-2012 The Bitcoin developers
+// Distributed under the MIT/X11 software license, see the accompanying
+// file license.txt or http://www.opensource.org/licenses/mit-license.php.
+#ifndef BITCOIN_SYNC_H
+#define BITCOIN_SYNC_H
+
+#include <boost/interprocess/sync/interprocess_recursive_mutex.hpp>
+#include <boost/interprocess/sync/scoped_lock.hpp>
+#include <boost/interprocess/sync/interprocess_semaphore.hpp>
+#include <boost/interprocess/sync/lock_options.hpp>
+
+
+
+
+/** Wrapped boost mutex: supports recursive locking, but no waiting  */
+typedef boost::interprocess::interprocess_recursive_mutex CCriticalSection;
+
+/** Wrapped boost mutex: supports waiting but not recursive locking */
+typedef boost::interprocess::interprocess_mutex CWaitableCriticalSection;
+
+#ifdef DEBUG_LOCKORDER
+void EnterCritical(const char* pszName, const char* pszFile, int nLine, void* cs, bool fTry = false);
+void LeaveCritical();
+#else
+void static inline EnterCritical(const char* pszName, const char* pszFile, int nLine, void* cs, bool fTry = false) {}
+void static inline LeaveCritical() {}
+#endif
+
+/** Wrapper around boost::interprocess::scoped_lock */
+template<typename Mutex>
+class CMutexLock
+{
+private:
+    boost::interprocess::scoped_lock<Mutex> lock;
+public:
+
+    void Enter(const char* pszName, const char* pszFile, int nLine)
+    {
+        if (!lock.owns())
+        {
+            EnterCritical(pszName, pszFile, nLine, (void*)(lock.mutex()));
+#ifdef DEBUG_LOCKCONTENTION
+            if (!lock.try_lock())
+            {
+                printf("LOCKCONTENTION: %s\n", pszName);
+                printf("Locker: %s:%d\n", pszFile, nLine);
+#endif
+            lock.lock();
+#ifdef DEBUG_LOCKCONTENTION
+            }
+#endif
+        }
+    }
+
+    void Leave()
+    {
+        if (lock.owns())
+        {
+            lock.unlock();
+            LeaveCritical();
+        }
+    }
+
+    bool TryEnter(const char* pszName, const char* pszFile, int nLine)
+    {
+        if (!lock.owns())
+        {
+            EnterCritical(pszName, pszFile, nLine, (void*)(lock.mutex()), true);
+            lock.try_lock();
+            if (!lock.owns())
+                LeaveCritical();
+        }
+        return lock.owns();
+    }
+
+    CMutexLock(Mutex& mutexIn, const char* pszName, const char* pszFile, int nLine, bool fTry = false) : lock(mutexIn, boost::interprocess::defer_lock)
+    {
+        if (fTry)
+            TryEnter(pszName, pszFile, nLine);
+        else
+            Enter(pszName, pszFile, nLine);
+    }
+
+    ~CMutexLock()
+    {
+        if (lock.owns())
+            LeaveCritical();
+    }
+
+    operator bool()
+    {
+        return lock.owns();
+    }
+
+    boost::interprocess::scoped_lock<Mutex> &GetLock()
+    {
+        return lock;
+    }
+};
+
+typedef CMutexLock<CCriticalSection> CCriticalBlock;
+
+#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 ENTER_CRITICAL_SECTION(cs) \
+    { \
+        EnterCritical(#cs, __FILE__, __LINE__, (void*)(&cs)); \
+        (cs).lock(); \
+    }
+
+#define LEAVE_CRITICAL_SECTION(cs) \
+    { \
+        (cs).unlock(); \
+        LeaveCritical(); \
+    }
+
+#ifdef MAC_OSX
+// boost::interprocess::interprocess_semaphore seems to spinlock on OSX; prefer polling instead
+class CSemaphore
+{
+private:
+    CCriticalSection cs;
+    int val;
+
+public:
+    CSemaphore(int init) : val(init) {}
+
+    void wait() {
+        do {
+            {
+                LOCK(cs);
+                if (val>0) {
+                    val--;
+                    return;
+                }
+            }
+            Sleep(100);
+        } while(1);
+    }
+
+    bool try_wait() {
+        LOCK(cs);
+        if (val>0) {
+            val--;
+            return true;
+        }
+        return false;
+    }
+
+    void post() {
+        LOCK(cs);
+        val++;
+    }
+};
+#else
+typedef boost::interprocess::interprocess_semaphore CSemaphore;
+#endif
+
+/** 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;
+    }
+};
+#endif
+

src/util.cpp

@@ -4,6 +4,7 @@
 // file license.txt or http://www.opensource.org/licenses/mit-license.php.
 
 #include "util.h"
+#include "sync.h"
 #include "strlcpy.h"
 #include "version.h"
 #include "ui_interface.h"
@@ -23,8 +24,6 @@ namespace boost {
 #include <boost/program_options/parsers.hpp>
 #include <boost/filesystem.hpp>
 #include <boost/filesystem/fstream.hpp>
-#include <boost/interprocess/sync/interprocess_mutex.hpp>
-#include <boost/interprocess/sync/interprocess_recursive_mutex.hpp>
 #include <boost/foreach.hpp>
 #include <openssl/crypto.h>
 #include <openssl/rand.h>
@@ -71,13 +70,14 @@ bool fLogTimestamps = false;
 CMedianFilter<int64> vTimeOffsets(200,0);
 
 // Init openssl library multithreading support
-static boost::interprocess::interprocess_mutex** ppmutexOpenSSL;
+static CCriticalSection** ppmutexOpenSSL;
 void locking_callback(int mode, int i, const char* file, int line)
 {
-    if (mode & CRYPTO_LOCK)
-        ppmutexOpenSSL[i]->lock();
-    else
-        ppmutexOpenSSL[i]->unlock();
+    if (mode & CRYPTO_LOCK) {
+        ENTER_CRITICAL_SECTION(*ppmutexOpenSSL[i]);
+    } else {
+        LEAVE_CRITICAL_SECTION(*ppmutexOpenSSL[i]);
+    }
 }
 
 // Init
@@ -87,9 +87,9 @@ public:
     CInit()
     {
         // Init openssl library multithreading support
-        ppmutexOpenSSL = (boost::interprocess::interprocess_mutex**)OPENSSL_malloc(CRYPTO_num_locks() * sizeof(boost::interprocess::interprocess_mutex*));
+        ppmutexOpenSSL = (CCriticalSection**)OPENSSL_malloc(CRYPTO_num_locks() * sizeof(CCriticalSection*));
         for (int i = 0; i < CRYPTO_num_locks(); i++)
-            ppmutexOpenSSL[i] = new boost::interprocess::interprocess_mutex();
+            ppmutexOpenSSL[i] = new CCriticalSection();
         CRYPTO_set_locking_callback(locking_callback);
 
 #ifdef WIN32
@@ -1221,117 +1221,3 @@ bool GetStartOnSystemStartup() { return false; }
 bool SetStartOnSystemStartup(bool fAutoStart) { return false; }
 
 #endif
-
-
-
-#ifdef DEBUG_LOCKORDER
-//
-// Early deadlock detection.
-// Problem being solved:
-//    Thread 1 locks  A, then B, then C
-//    Thread 2 locks  D, then C, then A
-//     --> may result in deadlock between the two threads, depending on when they run.
-// Solution implemented here:
-// Keep track of pairs of locks: (A before B), (A before C), etc.
-// Complain if any thread trys to lock in a different order.
-//
-
-struct CLockLocation
-{
-    CLockLocation(const char* pszName, const char* pszFile, int nLine)
-    {
-        mutexName = pszName;
-        sourceFile = pszFile;
-        sourceLine = nLine;
-    }
-
-    std::string ToString() const
-    {
-        return mutexName+"  "+sourceFile+":"+itostr(sourceLine);
-    }
-
-private:
-    std::string mutexName;
-    std::string sourceFile;
-    int sourceLine;
-};
-
-typedef std::vector< std::pair<void*, CLockLocation> > LockStack;
-
-static boost::interprocess::interprocess_mutex dd_mutex;
-static std::map<std::pair<void*, void*>, LockStack> lockorders;
-static boost::thread_specific_ptr<LockStack> lockstack;
-
-
-static void potential_deadlock_detected(const std::pair<void*, void*>& mismatch, const LockStack& s1, const LockStack& s2)
-{
-    printf("POTENTIAL DEADLOCK DETECTED\n");
-    printf("Previous lock order was:\n");
-    BOOST_FOREACH(const PAIRTYPE(void*, CLockLocation)& i, s2)
-    {
-        if (i.first == mismatch.first) printf(" (1)");
-        if (i.first == mismatch.second) printf(" (2)");
-        printf(" %s\n", i.second.ToString().c_str());
-    }
-    printf("Current lock order is:\n");
-    BOOST_FOREACH(const PAIRTYPE(void*, CLockLocation)& i, s1)
-    {
-        if (i.first == mismatch.first) printf(" (1)");
-        if (i.first == mismatch.second) printf(" (2)");
-        printf(" %s\n", i.second.ToString().c_str());
-    }
-}
-
-static void push_lock(void* c, const CLockLocation& locklocation, bool fTry)
-{
-    bool fOrderOK = true;
-    if (lockstack.get() == NULL)
-        lockstack.reset(new LockStack);
-
-    if (fDebug) printf("Locking: %s\n", locklocation.ToString().c_str());
-    dd_mutex.lock();
-
-    (*lockstack).push_back(std::make_pair(c, locklocation));
-
-    if (!fTry) BOOST_FOREACH(const PAIRTYPE(void*, CLockLocation)& i, (*lockstack))
-    {
-        if (i.first == c) break;
-
-        std::pair<void*, void*> p1 = std::make_pair(i.first, c);
-        if (lockorders.count(p1))
-            continue;
-        lockorders[p1] = (*lockstack);
-
-        std::pair<void*, void*> p2 = std::make_pair(c, i.first);
-        if (lockorders.count(p2))
-        {
-            potential_deadlock_detected(p1, lockorders[p2], lockorders[p1]);
-            break;
-        }
-    }
-    dd_mutex.unlock();
-}
-
-static void pop_lock()
-{
-    if (fDebug) 
-    {
-        const CLockLocation& locklocation = (*lockstack).rbegin()->second;
-        printf("Unlocked: %s\n", locklocation.ToString().c_str());
-    }
-    dd_mutex.lock();
-    (*lockstack).pop_back();
-    dd_mutex.unlock();
-}
-
-void EnterCritical(const char* pszName, const char* pszFile, int nLine, void* cs, bool fTry)
-{
-    push_lock(cs, CLockLocation(pszName, pszFile, nLine), fTry);
-}
-
-void LeaveCritical()
-{
-    pop_lock();
-}
-
-#endif /* DEBUG_LOCKORDER */

src/util.h

@@ -21,10 +21,6 @@ typedef int pid_t; /* define for windows compatiblity */
 #include <boost/thread.hpp>
 #include <boost/filesystem.hpp>
 #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_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>
 
@@ -188,206 +184,6 @@ void AddTimeData(const CNetAddr& ip, int64 nTime);
 
 
 
-/** Wrapped boost mutex: supports recursive locking, but no waiting  */
-typedef boost::interprocess::interprocess_recursive_mutex CCriticalSection;
-
-/** Wrapped boost mutex: supports waiting but not recursive locking */
-typedef boost::interprocess::interprocess_mutex CWaitableCriticalSection;
-
-#ifdef DEBUG_LOCKORDER
-void EnterCritical(const char* pszName, const char* pszFile, int nLine, void* cs, bool fTry = false);
-void LeaveCritical();
-#else
-void static inline EnterCritical(const char* pszName, const char* pszFile, int nLine, void* cs, bool fTry = false) {}
-void static inline LeaveCritical() {}
-#endif
-
-/** Wrapper around boost::interprocess::scoped_lock */
-template<typename Mutex>
-class CMutexLock
-{
-private:
-    boost::interprocess::scoped_lock<Mutex> lock;
-public:
-
-    void Enter(const char* pszName, const char* pszFile, int nLine)
-    {
-        if (!lock.owns())
-        {
-            EnterCritical(pszName, pszFile, nLine, (void*)(lock.mutex()));
-#ifdef DEBUG_LOCKCONTENTION
-            if (!lock.try_lock())
-            {
-                printf("LOCKCONTENTION: %s\n", pszName);
-                printf("Locker: %s:%d\n", pszFile, nLine);
-#endif
-            lock.lock();
-#ifdef DEBUG_LOCKCONTENTION
-            }
-#endif
-        }
-    }
-
-    void Leave()
-    {
-        if (lock.owns())
-        {
-            lock.unlock();
-            LeaveCritical();
-        }
-    }
-
-    bool TryEnter(const char* pszName, const char* pszFile, int nLine)
-    {
-        if (!lock.owns())
-        {
-            EnterCritical(pszName, pszFile, nLine, (void*)(lock.mutex()), true);
-            lock.try_lock();
-            if (!lock.owns())
-                LeaveCritical();
-        }
-        return lock.owns();
-    }
-
-    CMutexLock(Mutex& mutexIn, const char* pszName, const char* pszFile, int nLine, bool fTry = false) : lock(mutexIn, boost::interprocess::defer_lock)
-    {
-        if (fTry)
-            TryEnter(pszName, pszFile, nLine);
-        else
-            Enter(pszName, pszFile, nLine);
-    }
-
-    ~CMutexLock()
-    {
-        if (lock.owns())
-            LeaveCritical();
-    }
-
-    operator bool()
-    {
-        return lock.owns();
-    }
-
-    boost::interprocess::scoped_lock<Mutex> &GetLock()
-    {
-        return lock;
-    }
-};
-
-typedef CMutexLock<CCriticalSection> CCriticalBlock;
-
-#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 ENTER_CRITICAL_SECTION(cs) \
-    { \
-        EnterCritical(#cs, __FILE__, __LINE__, (void*)(&cs)); \
-        (cs).lock(); \
-    }
-
-#define LEAVE_CRITICAL_SECTION(cs) \
-    { \
-        (cs).unlock(); \
-        LeaveCritical(); \
-    }
-
-#ifdef MAC_OSX
-// boost::interprocess::interprocess_semaphore seems to spinlock on OSX; prefer polling instead
-class CSemaphore
-{
-private:
-    CCriticalSection cs;
-    int val;
-
-public:
-    CSemaphore(int init) : val(init) {}
-
-    void wait() {
-        do {
-            {
-                LOCK(cs);
-                if (val>0) {
-                    val--;
-                    return;
-                }
-            }
-            Sleep(100);
-        } while(1);
-    }
-
-    bool try_wait() {
-        LOCK(cs);
-        if (val>0) {
-            val--;
-            return true;
-        }
-        return false;
-    }
-
-    void post() {
-        LOCK(cs);
-        val++;
-    }
-};
-#else
-typedef boost::interprocess::interprocess_semaphore CSemaphore;
-#endif
-
-/** 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)
 {
     return strprintf("%"PRI64d, n);