nptl: Avoid expected SIGALRM in most tests [BZ #20432]

Before this change, several tests did not detect early deadlocks
because they used SIGALRM as the expected signal, and they ran
for the full default TIMEOUT seconds.

This commit adds a new delayed_exit function to the test skeleton,
along with several error-checking wrappers to pthread functions.
Additional error checking is introduced into several tests.

1 files changed, 7 insertions, 10 deletions

diff --git a/nptl/tst-mutex6.c b/nptl/tst-mutex6.c
index 1940687fee..3e989d8f55 100644
--- a/nptl/tst-mutex6.c
+++ b/nptl/tst-mutex6.c
@@ -23,6 +23,11 @@
 #include <errno.h>
 #include <stdbool.h>
 
+#ifndef TEST_FUNCTION
+static int do_test (void);
+# define TEST_FUNCTION do_test ()
+#endif
+#include "../test-skeleton.c"
 
 #ifndef ATTR
 pthread_mutexattr_t *attr;
@@ -62,18 +67,10 @@ do_test (void)
       return 1;
     }
 
-  /* Set an alarm for 1 second.  The wrapper will expect this.  */
-  alarm (1);
-
+  delayed_exit (1);
   /* This call should never return.  */
-  pthread_mutex_lock (&m);
+  xpthread_mutex_lock (&m);
 
   puts ("2nd mutex_lock returned");
   return 1;
 }
-
-#define EXPECTED_SIGNAL SIGALRM
-#ifndef TEST_FUNCTION
-# define TEST_FUNCTION do_test ()
-#endif
-#include "../test-skeleton.c"