Use

Use
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Chapter 28. Concurrency

Use

Typical usage of the last two constructs is demonstrated as follows: +

+#include <ext/concurrence.h>
+
+namespace
+{
+  __gnu_cxx::__mutex safe_base_mutex;
+} // anonymous namespace
+
+namespace other
+{
+  void
+  foo()
+  {
+    __gnu_cxx::__scoped_lock sentry(safe_base_mutex);
+    for (int i = 0; i < max;  ++i)
+      {
+	_Safe_iterator_base* __old = __iter;
+	__iter = __iter-<_M_next;
+	__old-<_M_detach_single();
+      }
+}
+

In this sample code, an anonymous namespace is used to keep +the __mutex private to the compilation unit, +and __scoped_lock is used to guard access to the critical +section within the for loop, locking the mutex on creation and freeing +the mutex as control moves out of this block. +

Several exception classes are used to keep track of +concurrence-related errors. These classes +are: __concurrence_lock_error, __concurrence_unlock_error, __concurrence_wait_error, +and __concurrence_broadcast_error. +

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