initial import

from
http://www.informit.com/store/programming-with-posix-threads-9780201633924

cond_attr.c

@@ -0,0 +1,34 @@
+/*
+ * cond_attr.c
+ *
+ * main() creates a condition variable using a non-default attributes object,
+ * cond_attr. If the implementation supports the pshared attribute, the
+ * condition variable is created "process private". (Note that, to create a
+ * "process shared" condition variable, the pthread_cond_t itself must be
+ * placed in shared memory that is accessible to all threads using the
+ * condition variable.)
+ */
+#include <pthread.h>
+#include "errors.h"
+
+pthread_cond_t cond;
+
+int main (int argc, char *argv[])
+{
+    pthread_condattr_t cond_attr;
+    int status;
+
+    status = pthread_condattr_init (&cond_attr);
+    if (status != 0)
+        err_abort (status, "Create attr");
+#ifdef _POSIX_THREAD_PROCESS_SHARED
+    status = pthread_condattr_setpshared (
+        &cond_attr, PTHREAD_PROCESS_PRIVATE);
+    if (status != 0)
+        err_abort (status, "Set pshared");
+#endif
+    status = pthread_cond_init (&cond, &cond_attr);
+    if (status != 0)
+        err_abort (status, "Init cond");
+    return 0;
+}