Ticket #11798: patch.2.diff

boost/thread/pthread/shared_mutex.hpp

@@ -24 +24 @@
 
 #include <boost/config/abi_prefix.hpp>
 
+#if defined BOOST_THREAD_USE_PTHREAD_RWLOCKS
+#include <stdexcept>
+#include <pthread.h>
+#endif
+
 namespace boost
 {
     class shared_mutex
@@ -162 +167 @@
         boost::condition_variable exclusive_cond;
         boost::condition_variable upgrade_cond;
 
+#if defined BOOST_THREAD_PTHREAD_USE_RWLOCKS
+        pthread_rwlock_t rw_lock;
+#endif
+
         void release_waiters()
         {
             exclusive_cond.notify_one();
@@ -174 +183 @@
 
         shared_mutex()
         {
+#if defined BOOST_THREAD_PTHREAD_USE_RWLOCKS
+            int ret = 0;
+#if defined(__linux__)
+            // Linux rwlocks are by default writer-starving
+            pthread_rwlockattr_t attr;
+            ret = pthread_rwlockattr_init(&attr);
+            if (ret)
+            {
+                throw std::runtime_error("pthread_rwlockattr_init faild");
+            }
+            ret = pthread_rwlockattr_setkind_np(&attr,
+                PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP);
+            if (ret)
+            {
+                throw std::runtime_error("pthread_rwlockattr_setkind_np failed");
+            }
+            ret = pthread_rwlock_init(&lock_, &attr);
+            if (ret)
+            {
+                throw std::runtime_error("pthread_rwlock_init failed");
+            }
+            ret = pthread_rwlockattr_destroy(&attr);
+            if (ret)
+            {
+                throw std::runtime_error("pthread_rwlockattr_destroy failed");
+            }
+#else
+            ret = pthread_rwlock_init(&lock_, NULL);
+            if (ret)
+            {
+                throw std::runtime_error("pthread_rwlock_init failed");
+            }
+#endif
+#endif
         }
 
         ~shared_mutex()
         {
+#if defined BOOST_THREAD_PTHREAD_USE_RWLOCKS
+            int ret = pthread_rwlock_destroy(&lock_);
+            if (ret)
+            {
+                throw std::runtime_error("pthread_rwlock_destroy failed");
+            }
+#endif
         }
 
         void lock_shared()
         {
+#if defined BOOST_THREAD_USE_PTHREAD_RWLOCKS
+            int ret = pthread_rwlock_rdlock(&rw_lock);
+            if (ret)
+            {
+                throw std::runtime_error("pthread_rwlock_rdlock failed");
+            }
+#else
 #if defined BOOST_THREAD_PROVIDES_INTERRUPTIONS
             boost::this_thread::disable_interruption do_not_disturb;
 #endif
@@ -191 +248 @@
                 shared_cond.wait(lk);
             }
             state.lock_shared();
+#endif
         }
 
         bool try_lock_shared()
         {
+#if definet BOOST_THREAD_USE_PTHREAD_RWLOCKS
+            int ret = pthread_rwlock_tryrdlock(&rw_lock);
+            if (!ret)
+            {
+                return true;
+            }
+            else if (ret == EBUSY)
+            {
+                return false;
+            }
+            throw std::runtime_error("pthread_rwlock_tryrdlock failed");
+#else
             boost::unique_lock<boost::mutex> lk(state_change);
 
             if(!state.can_lock_shared())
@@ -203 +273 @@
             }
             state.lock_shared();
             return true;
+#endif
         }
 
 #if defined BOOST_THREAD_USES_DATETIME
@@ -258 +329 @@
 #endif
         void unlock_shared()
         {
+#if defined BOOST_THREAD_USE_PTHREAD_RWLOCKS
+            int ret = pthread_rwlock_unlock(&rw_lock);
+            if (ret)
+            {
+                throw std::runtime_error("pthread_rwlock_unlock failed");
+            }
+#else
             boost::unique_lock<boost::mutex> lk(state_change);
             state.assert_lock_shared();
             state.unlock_shared();
@@ -279 +357 @@
                 }
                 release_waiters();
             }
+#endif
         }
 
         void lock()
         {
+#if defined BOOST_THREAD_USE_PTHREAD_RWLOCKS
+            int ret = pthread_rwlock_wrlock(&rw_lock);
+            if (ret)
+            {
+                throw std::runtime_error("pthread_rwlock_wrlock failed");
+            }
+#else
 #if defined BOOST_THREAD_PROVIDES_INTERRUPTIONS
             boost::this_thread::disable_interruption do_not_disturb;
 #endif
@@ -294 +380 @@
                 exclusive_cond.wait(lk);
             }
             state.exclusive=true;
+#endif
         }
 
 #if defined BOOST_THREAD_USES_DATETIME
@@ -363 +450 @@
 
         bool try_lock()
         {
+#if defined BOOST_THREAD_USE_PTHREAD_RWLOCKS
+            int ret = pthread_rwlock_trywrlock(&rw_lock);
+            if (!ret)
+            {
+                return true;
+            }
+            else if (ret == EBUSY)
+            {
+                return false;
+            }
+            throw std::runtime_error("pthread_rwlock_trywrlock failed");
+#else
             boost::unique_lock<boost::mutex> lk(state_change);
 
             if(state.shared_count || state.exclusive)
@@ -374 +473 @@
                 state.exclusive=true;
                 return true;
             }
-
+#endif
         }
 
         void unlock()
         {
+#if defined BOOST_THREAD_USE_PTHREAD_RWLOCKS
+            int ret = pthread_rwlock_unlock(&rw_lock);
+            if (ret)
+            {
+                throw std::runtime_error("pthread_rwlock_unlock failed");
+            }
+#else
             boost::unique_lock<boost::mutex> lk(state_change);
             state.assert_locked();
             state.exclusive=false;
             state.exclusive_waiting_blocked=false;
             state.assert_free();
             release_waiters();
+#endif
         }
 
         void lock_upgrade()