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1 | #include <pthread.h> | |
2 | #include <stdlib.h> | |
3 | #include <string.h> | |
4 | #include <unistd.h> | |
5 | #include <stdbool.h> | |
6 | #include <errno.h> | |
7 | #include <TargetConditionals.h> | |
8 | ||
9 | #include <pthread/pthread_spis.h> | |
10 | ||
11 | #include <sys/sysctl.h> | |
12 | ||
13 | #include "darwintest_defaults.h" | |
14 | #include <darwintest_multiprocess.h> | |
15 | ||
16 | struct context { | |
17 | pthread_mutex_t mutex; | |
18 | long value; | |
19 | long count; | |
20 | }; | |
21 | ||
22 | static void *test_thread(void *ptr) { | |
23 | int res; | |
24 | long old; | |
25 | struct context *context = ptr; | |
26 | ||
27 | int i = 0; | |
28 | char *str; | |
29 | ||
30 | do { | |
31 | bool try = i++ & 1; | |
32 | ||
33 | if (!try){ | |
34 | str = "pthread_mutex_lock"; | |
35 | res = pthread_mutex_lock(&context->mutex); | |
36 | } else { | |
37 | str = "pthread_mutex_trylock"; | |
38 | res = pthread_mutex_trylock(&context->mutex); | |
39 | } | |
40 | if (res != 0) { | |
41 | if (try && res == EBUSY) { | |
42 | continue; | |
43 | } | |
44 | T_ASSERT_POSIX_ZERO(res, "[%ld] %s", context->count, str); | |
45 | } | |
46 | ||
47 | old = __sync_fetch_and_or(&context->value, 1); | |
48 | if ((old & 1) != 0) { | |
49 | T_FAIL("[%ld] OR %lx\n", context->count, old); | |
50 | } | |
51 | ||
52 | old = __sync_fetch_and_and(&context->value, 0); | |
53 | if ((old & 1) == 0) { | |
54 | T_FAIL("[%ld] AND %lx\n", context->count, old); | |
55 | } | |
56 | ||
57 | res = pthread_mutex_unlock(&context->mutex); | |
58 | if (res) { | |
59 | T_ASSERT_POSIX_ZERO(res, "[%ld] pthread_mutex_lock", context->count); | |
60 | } | |
61 | } while (__sync_fetch_and_sub(&context->count, 1) > 0); | |
62 | ||
63 | T_PASS("thread completed successfully"); | |
64 | ||
65 | return NULL; | |
66 | } | |
67 | ||
68 | T_DECL(mutex, "pthread_mutex", | |
69 | T_META_ALL_VALID_ARCHS(YES)) | |
70 | { | |
71 | struct context context = { | |
72 | .mutex = PTHREAD_MUTEX_INITIALIZER, | |
73 | .value = 0, | |
74 | .count = 1000000, | |
75 | }; | |
76 | int i; | |
77 | int res; | |
78 | int threads = 8; | |
79 | pthread_t p[threads]; | |
80 | for (i = 0; i < threads; ++i) { | |
81 | res = pthread_create(&p[i], NULL, test_thread, &context); | |
82 | T_ASSERT_POSIX_ZERO(res, "pthread_create()"); | |
83 | } | |
84 | for (i = 0; i < threads; ++i) { | |
85 | res = pthread_join(p[i], NULL); | |
86 | T_ASSERT_POSIX_ZERO(res, "pthread_join()"); | |
87 | } | |
88 | } | |
89 | ||
90 | static void | |
91 | check_process_default_mutex_policy(int expected_policy) | |
92 | { | |
93 | pthread_mutexattr_t mattr; | |
94 | T_EXPECT_POSIX_ZERO(pthread_mutexattr_init(&mattr), "pthread_mutexattr_init()"); | |
95 | ||
96 | int policy; | |
97 | T_EXPECT_POSIX_ZERO(pthread_mutexattr_getpolicy_np(&mattr, &policy), | |
98 | "pthread_mutexattr_getpolicy_np()"); | |
99 | T_LOG("policy was %d", policy); | |
100 | T_EXPECT_EQ(policy, expected_policy, "Saw the expected default policy"); | |
101 | ||
102 | T_EXPECT_POSIX_ZERO(pthread_mutexattr_destroy(&mattr), "pthread_mutexattr_destroy()"); | |
103 | } | |
104 | ||
105 | T_DECL(mutex_default_policy, | |
106 | "Tests that the default mutex policy is firstfit") | |
107 | { | |
108 | check_process_default_mutex_policy(_PTHREAD_MUTEX_POLICY_FIRSTFIT); | |
109 | } | |
110 | ||
111 | T_DECL(mutex_default_policy_sysctl, | |
112 | "Tests that setting the policy sysctl changes the default policy") | |
113 | { | |
114 | int fairshare_default = _PTHREAD_MUTEX_POLICY_FAIRSHARE; | |
115 | T_EXPECT_POSIX_ZERO( | |
116 | sysctlbyname("kern.pthread_mutex_default_policy", NULL, NULL, &fairshare_default, sizeof(fairshare_default)), | |
117 | "Changed the default policy sysctl to fairshare"); | |
118 | ||
119 | dt_helper_t helper = dt_child_helper("mutex_default_policy_sysctl_helper"); | |
120 | dt_run_helpers(&helper, 1, 5); | |
121 | } | |
122 | ||
123 | T_HELPER_DECL(mutex_default_policy_sysctl_helper, "sysctl helper") | |
124 | { | |
125 | check_process_default_mutex_policy(_PTHREAD_MUTEX_POLICY_FAIRSHARE); | |
126 | ||
127 | int default_default = _PTHREAD_MUTEX_POLICY_FIRSTFIT; | |
128 | T_EXPECT_POSIX_ZERO( | |
129 | sysctlbyname("kern.pthread_mutex_default_policy", NULL, NULL, &default_default, sizeof(default_default)), | |
130 | "Restored the default policy to firstfit"); | |
131 | ||
132 | T_END; | |
133 | } | |
134 | ||
135 | T_DECL(mutex_default_policy_envvar, | |
136 | "Tests that setting the policy environment variable changes the default policy", | |
137 | T_META_ENVVAR("PTHREAD_MUTEX_DEFAULT_POLICY=1")) | |
138 | { | |
139 | check_process_default_mutex_policy(_PTHREAD_MUTEX_POLICY_FAIRSHARE); | |
140 | } | |
141 | ||
142 | static void * | |
143 | mutex_as_semaphore_signaller(void *arg) | |
144 | { | |
145 | pthread_mutex_t *mtx = arg; | |
146 | int rc = pthread_mutex_unlock(mtx); | |
147 | T_ASSERT_POSIX_ZERO(rc, "unlock"); | |
148 | ||
149 | return NULL; | |
150 | } | |
151 | ||
152 | T_DECL(mutex_as_semaphore_lock_owned, "Recursively lock a normal mutex to use as a semaphore") | |
153 | { | |
154 | pthread_t signaller; | |
155 | pthread_mutex_t mtx = PTHREAD_MUTEX_INITIALIZER; | |
156 | int rc = pthread_mutex_lock(&mtx); | |
157 | T_ASSERT_POSIX_ZERO(rc, "lock"); | |
158 | ||
159 | rc = pthread_create(&signaller, NULL, mutex_as_semaphore_signaller, &mtx); | |
160 | T_ASSERT_POSIX_ZERO(rc, "create"); | |
161 | ||
162 | rc = pthread_mutex_lock(&mtx); | |
163 | T_ASSERT_POSIX_ZERO(rc, "recursive lock"); | |
164 | ||
165 | rc = pthread_join(signaller, NULL); | |
166 | T_ASSERT_POSIX_ZERO(rc, "join"); | |
167 | ||
168 | T_END; | |
169 | } |