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Diffstat (limited to 'nptl/test-mutex-printers.c')
| -rw-r--r-- | nptl/test-mutex-printers.c | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/nptl/test-mutex-printers.c b/nptl/test-mutex-printers.c new file mode 100644 index 0000000000..b973e82840 --- /dev/null +++ b/nptl/test-mutex-printers.c @@ -0,0 +1,151 @@ +/* Helper program for testing the pthread_mutex_t pretty printer. + + Copyright (C) 2016 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + 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/>. */ + +/* Keep the calls to the pthread_* functions on separate lines to make it easy + to advance through the program using the gdb 'next' command. */ + +#include <stdlib.h> +#include <errno.h> +#include <pthread.h> + +#define PASS 0 +#define FAIL 1 + +static int test_status_destroyed (pthread_mutex_t *mutex); +static int test_status_no_robust (pthread_mutex_t *mutex, + pthread_mutexattr_t *attr); +static int test_status_robust (pthread_mutex_t *mutex, + pthread_mutexattr_t *attr); +static int test_locking_state_robust (pthread_mutex_t *mutex); +static void *thread_func (void *arg); +static int test_recursive_locks (pthread_mutex_t *mutex, + pthread_mutexattr_t *attr); + +int +main (void) +{ + pthread_mutex_t mutex; + pthread_mutexattr_t attr; + int result = FAIL; + + if (pthread_mutexattr_init (&attr) == 0 + && test_status_destroyed (&mutex) == PASS + && test_status_no_robust (&mutex, &attr) == PASS + && test_status_robust (&mutex, &attr) == PASS + && test_recursive_locks (&mutex, &attr) == PASS) + result = PASS; + /* Else, one of the pthread_mutex* functions failed. */ + + return result; +} + +/* Initializes MUTEX, then destroys it. */ +static int +test_status_destroyed (pthread_mutex_t *mutex) +{ + int result = FAIL; + + if (pthread_mutex_init (mutex, NULL) == 0 + && pthread_mutex_destroy (mutex) == 0) + result = PASS; /* Test status (destroyed). */ + + return result; +} + +/* Tests locking of non-robust mutexes. */ +static int +test_status_no_robust (pthread_mutex_t *mutex, pthread_mutexattr_t *attr) +{ + int result = FAIL; + + if (pthread_mutexattr_setrobust (attr, PTHREAD_MUTEX_STALLED) == 0 + && pthread_mutex_init (mutex, attr) == 0 + && pthread_mutex_lock (mutex) == 0 /* Test status (non-robust). */ + && pthread_mutex_unlock (mutex) == 0 + && pthread_mutex_destroy (mutex) == 0) + result = PASS; + + return result; +} + +/* Tests locking of robust mutexes. */ +static int +test_status_robust (pthread_mutex_t *mutex, pthread_mutexattr_t *attr) +{ + int result = FAIL; + + if (pthread_mutexattr_setrobust (attr, PTHREAD_MUTEX_ROBUST) == 0 + && pthread_mutex_init (mutex, attr) == 0 + && test_locking_state_robust (mutex) == PASS /* Test status (robust). */ + && pthread_mutex_destroy (mutex) == 0) + result = PASS; + + return result; +} + +/* Tests locking and state corruption of robust mutexes. We'll mark it as + inconsistent, then not recoverable. */ +static int +test_locking_state_robust (pthread_mutex_t *mutex) +{ + int result = FAIL; + pthread_t thread; + + if (pthread_create (&thread, NULL, thread_func, mutex) == 0 /* Create. */ + && pthread_join (thread, NULL) == 0 + && pthread_mutex_lock (mutex) == EOWNERDEAD /* Test locking (robust). */ + && pthread_mutex_unlock (mutex) == 0) + result = PASS; + + return result; +} + +/* Function to be called by the child thread when testing robust mutexes. */ +static void * +thread_func (void *arg) +{ + pthread_mutex_t *mutex = (pthread_mutex_t *)arg; + + if (pthread_mutex_lock (mutex) != 0) /* Thread function. */ + exit (FAIL); + + /* Thread terminates without unlocking the mutex, thus marking it as + inconsistent. */ + return NULL; +} + +/* Tests locking the mutex multiple times in a row. */ +static int +test_recursive_locks (pthread_mutex_t *mutex, pthread_mutexattr_t *attr) +{ + int result = FAIL; + + if (pthread_mutexattr_settype (attr, PTHREAD_MUTEX_RECURSIVE) == 0 + && pthread_mutex_init (mutex, attr) == 0 + && pthread_mutex_lock (mutex) == 0 + && pthread_mutex_lock (mutex) == 0 + && pthread_mutex_lock (mutex) == 0 /* Test recursive locks. */ + && pthread_mutex_unlock (mutex) == 0 + && pthread_mutex_unlock (mutex) == 0 + && pthread_mutex_unlock (mutex) == 0 + && pthread_mutex_destroy (mutex) == 0) + result = PASS; + + return result; +} |