Add support for Solaris thread library.

From-SVN: r25028

libstdc++/stl/stl_alloc.h

@@ -58,7 +58,8 @@
 #  define __RESTRICT
 #endif
 
-#if !defined(__STL_PTHREADS) && !defined(_NOTHREADS) \
+#if !defined(__STL_PTHREADS) && !defined(__STL_SOLTHREADS) \
+ && !defined(_NOTHREADS) \
  && !defined(__STL_SGI_THREADS) && !defined(__STL_WIN32THREADS)
 #   define _NOTHREADS
 #endif
@@ -75,6 +76,15 @@
 #   define __NODE_ALLOCATOR_THREADS true
 #   define __VOLATILE volatile  // Needed at -O3 on SGI
 # endif
+# ifdef __STL_SOLTHREADS
+#   include <thread.h>
+#   define __NODE_ALLOCATOR_LOCK \
+	if (threads) mutex_lock(&_S_node_allocator_lock)
+#   define __NODE_ALLOCATOR_UNLOCK \
+        if (threads) mutex_unlock(&_S_node_allocator_lock)
+#   define __NODE_ALLOCATOR_THREADS true
+#   define __VOLATILE
+# endif
 # ifdef __STL_WIN32THREADS
     // The lock needs to be initialized by constructing an allocator
     // objects of the right type.  We do that here explicitly for alloc.
@@ -358,6 +368,10 @@ private:
     static pthread_mutex_t _S_node_allocator_lock;
 # endif
 
+# ifdef __STL_SOLTHREADS
+    static mutex_t _S_node_allocator_lock;
+# endif
+
 # ifdef __STL_WIN32THREADS
     static CRITICAL_SECTION _S_node_allocator_lock;
     static bool _S_node_allocator_lock_initialized;
@@ -567,6 +581,13 @@ __default_alloc_template<threads, inst>::reallocate(void* __p,
         = PTHREAD_MUTEX_INITIALIZER;
 #endif
 
+#ifdef __STL_SOLTHREADS
+    template <bool __threads, int __inst>
+    mutex_t
+    __default_alloc_template<__threads, __inst>::_S_node_allocator_lock
+        = DEFAULTMUTEX;
+#endif
+
 #ifdef __STL_WIN32THREADS
     template <bool __threads, int __inst>
     CRITICAL_SECTION