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FreeBSD porting fixes, patch by maho@openoffice.org

--- Python-3.3.0/Python/thread_pthread.h	2012-11-28 09:00:41.097955124 +0000
+++ Python-3.3.0/Python/thread_pthread.h	2012-11-28 09:01:13.018329351 +0000
@@ -238,6 +238,9 @@
 {
     pthread_t th;
     int status;
+#ifdef __FreeBSD__
+	sigset_t set, oset;
+#endif
 #if defined(THREAD_STACK_SIZE) || defined(PTHREAD_SYSTEM_SCHED_SUPPORTED)
     pthread_attr_t attrs;
 #endif
@@ -277,6 +280,10 @@
     callback->func = func;
     callback->arg = arg;
 
+#ifdef __FreeBSD__
+	sigfillset(&set);
+	SET_THREAD_SIGMASK(SIG_BLOCK, &set, &oset);
+#endif
     status = pthread_create(&th,
 #if defined(THREAD_STACK_SIZE) || defined(PTHREAD_SYSTEM_SCHED_SUPPORTED)
                              &attrs,
@@ -285,6 +292,9 @@
 #endif
                              pythread_wrapper, callback);
 
+#ifdef __FreeBSD__
+	SET_THREAD_SIGMASK(SIG_SETMASK, &oset, NULL);
+#endif
 #if defined(THREAD_STACK_SIZE) || defined(PTHREAD_SYSTEM_SCHED_SUPPORTED)
     pthread_attr_destroy(&attrs);
 #endif