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403b4feb | 1 | /* Testing race while enabling lock elision. |
04277e02 | 2 | Copyright (C) 2018-2019 Free Software Foundation, Inc. |
403b4feb SL |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, see | |
17 | <http://www.gnu.org/licenses/>. */ | |
18 | #include <stdio.h> | |
19 | #include <stdlib.h> | |
20 | #include <stdint.h> | |
21 | #include <pthread.h> | |
22 | #include <unistd.h> | |
23 | #include <getopt.h> | |
24 | #include <support/support.h> | |
25 | #include <support/xthread.h> | |
26 | ||
27 | static pthread_barrier_t barrier; | |
28 | static pthread_mutex_t mutex; | |
29 | static long long int iteration_count = 1000000; | |
30 | static unsigned int thread_count = 3; | |
31 | ||
32 | static void * | |
33 | thr_func (void *arg) | |
34 | { | |
35 | long long int i; | |
36 | for (i = 0; i < iteration_count; i++) | |
37 | { | |
38 | if ((uintptr_t) arg == 0) | |
39 | { | |
40 | xpthread_mutex_destroy (&mutex); | |
41 | xpthread_mutex_init (&mutex, NULL); | |
42 | } | |
43 | ||
44 | xpthread_barrier_wait (&barrier); | |
45 | ||
46 | /* Test if enabling lock elision works if it is enabled concurrently. | |
47 | There was a race in FORCE_ELISION macro which leads to either | |
48 | pthread_mutex_destroy returning EBUSY as the owner was recorded | |
49 | by pthread_mutex_lock - in "normal mutex" code path - but was not | |
50 | resetted in pthread_mutex_unlock - in "elision" code path. | |
51 | Or it leads to the assertion in nptl/pthread_mutex_lock.c: | |
52 | assert (mutex->__data.__owner == 0); | |
53 | Please ensure that the test is run with lock elision: | |
54 | export GLIBC_TUNABLES=glibc.elision.enable=1 */ | |
55 | xpthread_mutex_lock (&mutex); | |
56 | xpthread_mutex_unlock (&mutex); | |
57 | ||
58 | xpthread_barrier_wait (&barrier); | |
59 | } | |
60 | return NULL; | |
61 | } | |
62 | ||
63 | static int | |
64 | do_test (void) | |
65 | { | |
66 | unsigned int i; | |
67 | printf ("Starting %d threads to run %lld iterations.\n", | |
68 | thread_count, iteration_count); | |
69 | ||
70 | pthread_t *threads = xmalloc (thread_count * sizeof (pthread_t)); | |
71 | xpthread_barrier_init (&barrier, NULL, thread_count); | |
72 | xpthread_mutex_init (&mutex, NULL); | |
73 | ||
74 | for (i = 0; i < thread_count; i++) | |
75 | threads[i] = xpthread_create (NULL, thr_func, (void *) (uintptr_t) i); | |
76 | ||
77 | for (i = 0; i < thread_count; i++) | |
78 | xpthread_join (threads[i]); | |
79 | ||
80 | xpthread_barrier_destroy (&barrier); | |
81 | free (threads); | |
82 | ||
83 | return EXIT_SUCCESS; | |
84 | } | |
85 | ||
86 | #define OPT_ITERATIONS 10000 | |
87 | #define OPT_THREADS 10001 | |
88 | #define CMDLINE_OPTIONS \ | |
89 | { "iterations", required_argument, NULL, OPT_ITERATIONS }, \ | |
90 | { "threads", required_argument, NULL, OPT_THREADS }, | |
91 | static void | |
92 | cmdline_process (int c) | |
93 | { | |
94 | long long int arg = strtoll (optarg, NULL, 0); | |
95 | switch (c) | |
96 | { | |
97 | case OPT_ITERATIONS: | |
98 | if (arg > 0) | |
99 | iteration_count = arg; | |
100 | break; | |
101 | case OPT_THREADS: | |
102 | if (arg > 0 && arg < 100) | |
103 | thread_count = arg; | |
104 | break; | |
105 | } | |
106 | } | |
107 | #define CMDLINE_PROCESS cmdline_process | |
108 | #define TIMEOUT 50 | |
109 | #include <support/test-driver.c> |