* cygwin.din: Add pthread_rwlock_destroy, pthread_rwlock_init,

pthread_rwlock_rdlock, pthread_rwlock_tryrdlock,
pthread_rwlock_wrlock, pthread_rwlock_trywrlock,
pthread_rwlock_unlock, pthread_rwlockattr_init,
pthread_rwlockattr_getpshared, pthread_rwlockattr_setpshared,
and pthread_rwlockattr_destroy.
* include/cygwin/version.h: Bump API minor number.
* include/pthread.h (PTHREAD_RWLOCK_INITIALIZER): Define a
reasonable value.
Add prototypes for pthread_rwlock_destroy, pthread_rwlock_init,
pthread_rwlock_rdlock, pthread_rwlock_tryrdlock,
pthread_rwlock_wrlock, pthread_rwlock_trywrlock,
pthread_rwlock_unlock, pthread_rwlockattr_init,
pthread_rwlockattr_getpshared, pthread_rwlockattr_setpshared,
and pthread_rwlockattr_destroy.
* thread.h (PTHREAD_ONCE_MAGIC): Remove superflous semicolon.
(PTHREAD_RWLOCK_MAGIC): New define.
(PTHREAD_RWLOCKATTR_MAGIC): Ditto.
(pthread_rwlockattr): New class.
(pthread_rwlock): Ditto.
(MTinterface::rwlocks): New member.
(MTinterface::MTinterface): Initialize rwlocks.
Add prototypes for __pthread_rwlock_destroy,
__pthread_rwlock_wrlock, __pthread_rwlock_trywrlock,
__pthread_rwlock_unlock, __pthread_rwlockattr_init,
__pthread_rwlockattr_getpshared, __pthread_rwlockattr_setpshared,
and __pthread_rwlockattr_destroy.
* thread.cc (MTinterface::Init): Initialize rwlock internal mutex.
(MTinterface::fixup_after_fork): Fixup rwlocks after fork.
(pthread_rwlockattr::isGoodObject): Implement.
(pthread_rwlockattr::pthread_rwlockattr): Ditto.
(pthread_rwlockattr::~pthread_rwlockattr): Ditto.
(pthread_rwlock::initMutex): Ditto.
(pthread_rwlock::pthread_rwlock): Ditto.
(pthread_rwlock::~pthread_rwlock): Ditto.
(pthread_rwlock::RdLock): Ditto.
(pthread_rwlock::TryRdLock): Ditto.
(pthread_rwlock::WrLock): Ditto.
(pthread_rwlock::TryWrLock): Ditto.
(pthread_rwlock::UnLock): Ditto.
(pthread_rwlock::addReader): Ditto.
(pthread_rwlock::removeReader): Ditto.
(pthread_rwlock::lookupReader): Ditto.
(pthread_rwlock::RdLockCleanup): Ditto.
(pthread_rwlock::WrLockCleanup): Ditto.
(pthread_rwlock::fixup_after_fork): Ditto.
(pthread_rwlock::isGoodObject): Ditto.
(pthread_rwlock::isGoodInitializer): Ditto.
(pthread_rwlock::isGoodInitializerOrObject): Ditto.
(pthread_rwlock::isGoodInitializerOrBadObject): Ditto.
(__pthread_rwlock_destroy): Ditto.
(pthread_rwlock::init): Ditto.
(__pthread_rwlock_rdlock): Ditto.
(__pthread_rwlock_tryrdlock): Ditto.
(__pthread_rwlock_wrlock): Ditto.
(__pthread_rwlock_trywrlock): Ditto.

winsup/cygwin/pthread.cc

@@ -388,6 +388,74 @@ pthread_condattr_setpshared (pthread_condattr_t * attr, int pshared)
   return __pthread_condattr_setpshared (attr, pshared);
 }
 
+/* RW Locks */
+int
+pthread_rwlock_destroy (pthread_rwlock_t *rwlock)
+{
+  return __pthread_rwlock_destroy (rwlock);
+}
+
+int
+pthread_rwlock_init (pthread_rwlock_t *rwlock, const pthread_rwlockattr_t *attr)
+{
+  return pthread_rwlock::init (rwlock, attr);
+}
+
+int
+pthread_rwlock_rdlock (pthread_rwlock_t *rwlock)
+{
+  return __pthread_rwlock_rdlock (rwlock);
+}
+
+int
+pthread_rwlock_tryrdlock (pthread_rwlock_t *rwlock)
+{
+  return __pthread_rwlock_tryrdlock (rwlock);
+}
+
+int
+pthread_rwlock_wrlock (pthread_rwlock_t *rwlock)
+{
+  return __pthread_rwlock_wrlock (rwlock);
+}
+
+int
+pthread_rwlock_trywrlock (pthread_rwlock_t *rwlock)
+{
+  return __pthread_rwlock_trywrlock (rwlock);
+}
+
+int
+pthread_rwlock_unlock (pthread_rwlock_t *rwlock)
+{
+  return __pthread_rwlock_unlock (rwlock);
+}
+
+int
+pthread_rwlockattr_init (pthread_rwlockattr_t *rwlockattr)
+{
+  return __pthread_rwlockattr_init (rwlockattr);
+}
+
+int
+pthread_rwlockattr_getpshared (const pthread_rwlockattr_t *attr,
+                               int *pshared)
+{
+  return __pthread_rwlockattr_getpshared (attr, pshared);
+}
+
+int
+pthread_rwlockattr_setpshared (pthread_rwlockattr_t *attr, int pshared)
+{
+  return __pthread_rwlockattr_setpshared (attr, pshared);
+}
+
+int
+pthread_rwlockattr_destroy (pthread_rwlockattr_t *rwlockattr)
+{
+  return __pthread_rwlockattr_destroy (rwlockattr);
+}
+
 /* Scheduling */
 
 int