initial import

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

thread_error.c

@@ -0,0 +1,29 @@
+/*
+ * thread_error.c
+ *
+ * Demonstrate detection of errors from a typical POSIX 1003.1c-1995
+ * function, pthread_join.
+ */
+#include <pthread.h>
+#include <stdio.h>
+#include <errno.h>
+
+int main (int argc, char *argv[])
+{
+    pthread_t thread;
+    int status;
+
+    /*
+     * Attempt to join with an uninitialized thread ID. On most
+     * implementations, this will return an ESRCH error code. If
+     * the local (and uninitialized) pthread_t happens to be a valid
+     * thread ID, it is almost certainly that of the initial thread,
+     * which is running main(). In that case, your Pthreads
+     * implementation may either return EDEADLK (self-deadlock),
+     * or it may hang. If it hangs, quit and try again.
+     */
+    status = pthread_join (thread, NULL);
+    if (status != 0)
+        fprintf (stderr, "error %d: %s\n", status, strerror (status));
+    return status;
+}