@@ -217,7 +217,7 @@ tests = tst-typesizes \
tst-cond14 tst-cond15 tst-cond16 tst-cond17 tst-cond18 tst-cond19
\
tst-cond20 tst-cond21 tst-cond22 tst-cond23 tst-cond24 tst-cond25
\
tst-cond-except \
- tst-condpi1 \
+ tst-condpi1 tst-condpi2 \
tst-robust1 tst-robust2 tst-robust3 tst-robust4 tst-robust5 \
tst-robust6 tst-robust7 tst-robust8 tst-robust9 \
tst-robustpi1 tst-robustpi2 tst-robustpi3 tst-robustpi4
tst-robustpi5 \
new file mode 100644
@@ -0,0 +1,290 @@
+/* Copyright (C) 2002, 2010, 2013 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Darren Hart <dvhltc@us.ibm.com>
+ Based on pthread_cond_hang.c by Dinakar Guniguntala <dino@in.ibm.com>
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#include <error.h>
+#include <errno.h>
+#include <pthread.h>
+#include <sched.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <sys/time.h>
+#include <unistd.h>
+
+#define LOW_PRIO 1
+#define MED_PRIO 2
+#define HIGH_PRIO 3
+#define MAIN_PRIO 4
+
+static pthread_cond_t race_var;
+static pthread_mutex_t race_mut;
+
+static pthread_cond_t sig1, sig2, sig3;
+static pthread_mutex_t m1, m2, m3;
+
+static volatile unsigned int done = 0;
+
+static void *
+low_tf (void *p)
+{
+ int err;
+
+ /* Wait for do_test to start all the threads. */
+ err = pthread_mutex_lock (&m1);
+ if (err != 0)
+ error (EXIT_FAILURE, err, "low_tf: failed to lock m1");
+ err = pthread_cond_wait (&sig1, &m1);
+ if (err != 0)
+ error (EXIT_FAILURE, err, "low_tf: cond_wait failed on sig1");
+
+ err = pthread_mutex_lock (&race_mut);
+ if (err != 0)
+ error (EXIT_FAILURE, err, "low_tf: failed to lock race_mut");
+
+ puts ("low_tf: locked");
+
+ /* Signal the high_tf that we have the race_mut, it will preempt us
until it
+ * blocks on race_mut. */
+ err = pthread_cond_signal (&sig2);
+ if (err != 0)
+ error (EXIT_FAILURE, err, "low_tf: failed to signal sig2");
+
+ /* pthread_cond_wait() holds the cond_lock when it unlocks race_mut.
high_tf
+ will preempt us before we can release the cond_lock. It will signal
med_tf
+ which will continue to block us after high_tf tries to block on
race_var if
+ it isn't PTHREAD_PRIO_INHERIT, and the cond_lock will never be
released. */
+ err = pthread_cond_wait (&race_var, &race_mut);
+ if (err != 0)
+ error (EXIT_FAILURE, err, "low_tf: cond_wait failed on race_var");
+
+ puts ("low_tf: done waiting");
+
+ err = pthread_mutex_unlock (&race_mut);
+ if (err != 0)
+ error (EXIT_FAILURE, err, "low_tf: failed to unlock race_mut");
+
+ return NULL;
+}
+
+static void *
+high_tf (void *p)
+{
+ int err;
+
+ err = pthread_mutex_lock (&m2);
+ if (err != 0)
+ error (EXIT_FAILURE, err, "high_tf: failed to lock m2");
+
+ /* Wait for low_tf to take race_mut and signal us. We will preempt
low_tf
+ * until we block on race_mut below. */
+ err = pthread_cond_wait (&sig2, &m2);
+ if (err != 0)
+ error (EXIT_FAILURE, err, "high_tf: cond_wait failed on sig2");
+
+ /* Wait for low_tf to release the lock as it waits on race_var. */
+ err = pthread_mutex_lock (&race_mut);
+ if (err != 0)
+ error (EXIT_FAILURE, err, "high_tf: failed to lock race_mut");
+
+ puts ("high_tf: locked");
+
+ /* Signal the med_tf to start spinning. */
+ err = pthread_cond_signal (&sig3);
+ if (err != 0)
+ error (EXIT_FAILURE, err, "high_tf: failed to signal sig3");
+
+ /* If the race_var isn't PTHREAD_PRIO_INHERIT, we will block on the
+ race_var cond_lock waiting for the low_tf to release it in it's
+ pthread_cond_wait(&race_var, &race_mut) call. */
+ err = pthread_cond_wait (&race_var, &race_mut);
+ if (err != 0)
+ error (EXIT_FAILURE, err, "high_tf: cond_wait failed on race_var");
+
+ puts ("high_tf: done waiting");
+
+ err = pthread_mutex_unlock (&race_mut);
+ if (err != 0)
+ error (EXIT_FAILURE, err, "high_tf: failed to unlock race_mut");
+
+ done = 1;
+ return NULL;
+}
+
+static void *
+med_tf (void *p)
+{
+ int err;
+
+ err = pthread_mutex_lock (&m3);
+ if (err != 0)
+ error (EXIT_FAILURE, err, "med_tf: failed to lock m3");
+
+ /* Wait for high_tf to signal us. */
+ err = pthread_cond_wait (&sig3, &m3);
+ if (err != 0)
+ error (EXIT_FAILURE, err, "med_tf: cond_wait failed on sig3");
+
+ puts ("med_tf: spinning");
+
+ while (!done)
+ /* Busy wait to block low threads. */;
+
+ puts ("med_tf: done spinning");
+
+ return NULL;
+}
+
+static int
+do_test (void)
+{
+ pthread_t low_thread;
+ pthread_t med_thread;
+ pthread_t high_thread;
+ struct sched_param param;
+ pthread_attr_t attr;
+ pthread_mutexattr_t m_attr;
+ pthread_condattr_t c_attr;
+ cpu_set_t cset;
+
+ int err;
+
+
+ /* Initialize mutexes and condvars. */
+
+ err = pthread_attr_init (&attr);
+ if (err != 0)
+ error (EXIT_FAILURE, err, "parent: failed to init pthread_attr");
+ err = pthread_attr_setinheritsched (&attr, PTHREAD_EXPLICIT_SCHED);
+ if (err != 0)
+ error (EXIT_FAILURE, err, "parent: failed to set attr inheritsched");
+ err = pthread_attr_setschedpolicy (&attr, SCHED_FIFO);
+ if (err != 0)
+ error (EXIT_FAILURE, err, "parent: failed to set attr schedpolicy");
+
+ err = pthread_condattr_init (&c_attr);
+ if (err != 0)
+ error (EXIT_FAILURE, err, "parent: failed to init condattr");
+
+ err = pthread_condattr_setprotocol_np (&c_attr, PTHREAD_PRIO_INHERIT);
+ if (err != 0)
+ error (EXIT_FAILURE, err, "parent: failed to set condattr protocol");
+
+ err = pthread_cond_init (&sig1, &c_attr);
+ if (err != 0)
+ error (EXIT_FAILURE, err, "parent: failed to init cond sig1");
+ err = pthread_cond_init (&sig2, &c_attr);
+ if (err != 0)
+ error (EXIT_FAILURE, err, "parent: failed to init cond sig2");
+ err = pthread_cond_init (&sig3, &c_attr);
+ if (err != 0)
+ error (EXIT_FAILURE, err, "parent: failed to init cond sig3");
+ err = pthread_cond_init (&race_var, &c_attr);
+ if (err != 0)
+ error (EXIT_FAILURE, err, "parent: failed to init cond race_var");
+
+ err = pthread_mutexattr_init (&m_attr);
+ if (err != 0)
+ error (EXIT_FAILURE, err, "parent: failed to init mutexattr");
+ err = pthread_mutexattr_setprotocol (&m_attr, PTHREAD_PRIO_INHERIT);
+ if (err != 0)
+ error (EXIT_FAILURE, err, "parent: failed to set mutexattr
protocol");
+ err = pthread_mutex_init (&m1, &m_attr);
+ if (err != 0)
+ error (EXIT_FAILURE, err, "parent: failed to init mutex m1");
+ err = pthread_mutex_init (&m2, &m_attr);
+ if (err != 0)
+ error (EXIT_FAILURE, err, "parent: failed to init mutex m2");
+ err = pthread_mutex_init (&m3, &m_attr);
+ if (err != 0)
+ error (EXIT_FAILURE, err, "parent: failed to init mutex m3");
+ err = pthread_mutex_init (&race_mut, &m_attr);
+ if (err != 0)
+ error (EXIT_FAILURE, err, "parent: failed to init mutex race_mut");
+
+ /* Setup scheduling parameters and create threads. */
+ param.sched_priority = MAIN_PRIO;
+ err = sched_setscheduler (0, SCHED_FIFO, ¶m);
+ if (err != 0)
+ error (EXIT_FAILURE, err, "parent: failed to set scheduler policy");
+
+ CPU_ZERO (&cset);
+ CPU_SET (0, &cset);
+ err = sched_setaffinity (0, sizeof (cpu_set_t), &cset);
+ if (err != 0)
+ error (EXIT_FAILURE, err, "parent: failed to set CPU affinity");
+
+ param.sched_priority = LOW_PRIO;
+ err = pthread_attr_setschedparam (&attr, ¶m);
+ if (err != 0)
+ error (EXIT_FAILURE, err, "parent: failed to set sched param for
low_tf");
+ err = pthread_create (&low_thread, &attr, low_tf, (void*)NULL);
+ if (err != 0)
+ error (EXIT_FAILURE, err, "parent: failed to create low_tf");
+
+ param.sched_priority = MED_PRIO;
+ err = pthread_attr_setschedparam (&attr, ¶m);
+ if (err != 0)
+ error (EXIT_FAILURE, err, "parent: failed to set sched param for
med_tf");
+ pthread_create (&med_thread, &attr, med_tf, (void*)NULL);
+ if (err != 0)
+ error (EXIT_FAILURE, err, "parent: failed to create med_tf");
+
+ param.sched_priority = HIGH_PRIO;
+ err = pthread_attr_setschedparam (&attr, ¶m);
+ if (err != 0)
+ error (EXIT_FAILURE, err, "parent: failed to set sched param for
high_tf");
+ err = pthread_create (&high_thread, &attr, high_tf, (void*)NULL);
+ if (err != 0)
+ error (EXIT_FAILURE, err, "parent: failed to create high_tf");
+
+ /* Wait for the threads to start and block on their respective
condvars. */
+ usleep (1000);
+ err = pthread_cond_signal (&sig1);
+ if (err != 0)
+ error (EXIT_FAILURE, err, "parent: failed to signal condition");
+
+ /* Wake low_tf and high_tf, allowing them to complete. If race_var is
not
+ PTHREAD_PRIO_INHERIT, low_tf will not have released the race_var
cond_lock
+ and neither thread will have waited on race_var. */
+ usleep (1000);
+ err = pthread_cond_broadcast (&race_var);
+ if (err != 0)
+ error (EXIT_FAILURE, err, "parent: failed to broadcast condition");
+
+ /* Wait for threads to complete. */
+ err = pthread_join (low_thread, (void**) NULL);
+ if (err != 0)
+ error (EXIT_FAILURE, err, "join of low_tf failed");
+ err = pthread_join (med_thread, (void**) NULL);
+ if (err != 0)
+ error (EXIT_FAILURE, err, "join of med_tf failed");