1 | /* |
2 | * Copyright 2010-2018 Amazon.com, Inc. or its affiliates. All Rights Reserved. |
3 | * |
4 | * Licensed under the Apache License, Version 2.0 (the "License"). |
5 | * You may not use this file except in compliance with the License. |
6 | * A copy of the License is located at |
7 | * |
8 | * http://aws.amazon.com/apache2.0 |
9 | * |
10 | * or in the "license" file accompanying this file. This file is distributed |
11 | * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either |
12 | * express or implied. See the License for the specific language governing |
13 | * permissions and limitations under the License. |
14 | */ |
15 | |
16 | #include <aws/common/thread.h> |
17 | |
18 | #include <aws/common/clock.h> |
19 | |
20 | #include <errno.h> |
21 | #include <limits.h> |
22 | #include <time.h> |
23 | |
24 | static struct aws_thread_options s_default_options = { |
25 | /* this will make sure platform default stack size is used. */ |
26 | .stack_size = 0}; |
27 | |
28 | struct thread_atexit_callback { |
29 | aws_thread_atexit_fn *callback; |
30 | void *user_data; |
31 | struct thread_atexit_callback *next; |
32 | }; |
33 | |
34 | struct thread_wrapper { |
35 | struct aws_allocator *allocator; |
36 | void (*func)(void *arg); |
37 | void *arg; |
38 | struct thread_atexit_callback *atexit; |
39 | void (*call_once)(void *); |
40 | void *once_arg; |
41 | }; |
42 | |
43 | static AWS_THREAD_LOCAL struct thread_wrapper *tl_wrapper = NULL; |
44 | |
45 | static void *thread_fn(void *arg) { |
46 | struct thread_wrapper wrapper = *(struct thread_wrapper *)arg; |
47 | struct aws_allocator *allocator = wrapper.allocator; |
48 | tl_wrapper = &wrapper; |
49 | wrapper.func(wrapper.arg); |
50 | |
51 | struct thread_atexit_callback *exit_callback_data = wrapper.atexit; |
52 | aws_mem_release(allocator, arg); |
53 | |
54 | while (exit_callback_data) { |
55 | aws_thread_atexit_fn *exit_callback = exit_callback_data->callback; |
56 | void *exit_callback_user_data = exit_callback_data->user_data; |
57 | struct thread_atexit_callback *next_exit_callback_data = exit_callback_data->next; |
58 | |
59 | aws_mem_release(allocator, exit_callback_data); |
60 | |
61 | exit_callback(exit_callback_user_data); |
62 | exit_callback_data = next_exit_callback_data; |
63 | } |
64 | tl_wrapper = NULL; |
65 | |
66 | return NULL; |
67 | } |
68 | |
69 | const struct aws_thread_options *aws_default_thread_options(void) { |
70 | return &s_default_options; |
71 | } |
72 | |
73 | void aws_thread_clean_up(struct aws_thread *thread) { |
74 | if (thread->detach_state == AWS_THREAD_JOINABLE) { |
75 | pthread_detach(thread->thread_id); |
76 | } |
77 | } |
78 | |
79 | static void s_call_once(void) { |
80 | tl_wrapper->call_once(tl_wrapper->once_arg); |
81 | } |
82 | |
83 | void aws_thread_call_once(aws_thread_once *flag, void (*call_once)(void *), void *user_data) { |
84 | // If this is a non-aws_thread, then gin up a temp thread wrapper |
85 | struct thread_wrapper temp_wrapper; |
86 | if (!tl_wrapper) { |
87 | tl_wrapper = &temp_wrapper; |
88 | } |
89 | |
90 | tl_wrapper->call_once = call_once; |
91 | tl_wrapper->once_arg = user_data; |
92 | pthread_once(flag, s_call_once); |
93 | |
94 | if (tl_wrapper == &temp_wrapper) { |
95 | tl_wrapper = NULL; |
96 | } |
97 | } |
98 | |
99 | int aws_thread_init(struct aws_thread *thread, struct aws_allocator *allocator) { |
100 | thread->allocator = allocator; |
101 | thread->thread_id = 0; |
102 | thread->detach_state = AWS_THREAD_NOT_CREATED; |
103 | |
104 | return AWS_OP_SUCCESS; |
105 | } |
106 | |
107 | int aws_thread_launch( |
108 | struct aws_thread *thread, |
109 | void (*func)(void *arg), |
110 | void *arg, |
111 | const struct aws_thread_options *options) { |
112 | |
113 | pthread_attr_t attributes; |
114 | pthread_attr_t *attributes_ptr = NULL; |
115 | int attr_return = 0; |
116 | int allocation_failed = 0; |
117 | |
118 | if (options) { |
119 | attr_return = pthread_attr_init(&attributes); |
120 | |
121 | if (attr_return) { |
122 | goto cleanup; |
123 | } |
124 | |
125 | attributes_ptr = &attributes; |
126 | |
127 | if (options->stack_size > PTHREAD_STACK_MIN) { |
128 | attr_return = pthread_attr_setstacksize(attributes_ptr, options->stack_size); |
129 | |
130 | if (attr_return) { |
131 | goto cleanup; |
132 | } |
133 | } |
134 | } |
135 | |
136 | struct thread_wrapper *wrapper = |
137 | (struct thread_wrapper *)aws_mem_calloc(thread->allocator, 1, sizeof(struct thread_wrapper)); |
138 | |
139 | if (!wrapper) { |
140 | allocation_failed = 1; |
141 | goto cleanup; |
142 | } |
143 | |
144 | wrapper->allocator = thread->allocator; |
145 | wrapper->func = func; |
146 | wrapper->arg = arg; |
147 | attr_return = pthread_create(&thread->thread_id, attributes_ptr, thread_fn, (void *)wrapper); |
148 | |
149 | if (attr_return) { |
150 | goto cleanup; |
151 | } |
152 | |
153 | thread->detach_state = AWS_THREAD_JOINABLE; |
154 | |
155 | cleanup: |
156 | if (attributes_ptr) { |
157 | pthread_attr_destroy(attributes_ptr); |
158 | } |
159 | |
160 | if (attr_return == EINVAL) { |
161 | return aws_raise_error(AWS_ERROR_THREAD_INVALID_SETTINGS); |
162 | } |
163 | |
164 | if (attr_return == EAGAIN) { |
165 | return aws_raise_error(AWS_ERROR_THREAD_INSUFFICIENT_RESOURCE); |
166 | } |
167 | |
168 | if (attr_return == EPERM) { |
169 | return aws_raise_error(AWS_ERROR_THREAD_NO_PERMISSIONS); |
170 | } |
171 | |
172 | if (allocation_failed || attr_return == ENOMEM) { |
173 | return aws_raise_error(AWS_ERROR_OOM); |
174 | } |
175 | |
176 | return AWS_OP_SUCCESS; |
177 | } |
178 | |
179 | uint64_t aws_thread_get_id(struct aws_thread *thread) { |
180 | return (uintptr_t)thread->thread_id; |
181 | } |
182 | |
183 | enum aws_thread_detach_state aws_thread_get_detach_state(struct aws_thread *thread) { |
184 | return thread->detach_state; |
185 | } |
186 | |
187 | int aws_thread_join(struct aws_thread *thread) { |
188 | if (thread->detach_state == AWS_THREAD_JOINABLE) { |
189 | int err_no = pthread_join(thread->thread_id, 0); |
190 | |
191 | if (err_no) { |
192 | if (err_no == EINVAL) { |
193 | return aws_raise_error(AWS_ERROR_THREAD_NOT_JOINABLE); |
194 | } |
195 | if (err_no == ESRCH) { |
196 | return aws_raise_error(AWS_ERROR_THREAD_NO_SUCH_THREAD_ID); |
197 | } |
198 | if (err_no == EDEADLK) { |
199 | return aws_raise_error(AWS_ERROR_THREAD_DEADLOCK_DETECTED); |
200 | } |
201 | } |
202 | |
203 | thread->detach_state = AWS_THREAD_JOIN_COMPLETED; |
204 | } |
205 | |
206 | return AWS_OP_SUCCESS; |
207 | } |
208 | |
209 | uint64_t aws_thread_current_thread_id(void) { |
210 | return (uintptr_t)pthread_self(); |
211 | } |
212 | |
213 | void aws_thread_current_sleep(uint64_t nanos) { |
214 | uint64_t nano = 0; |
215 | time_t seconds = (time_t)aws_timestamp_convert(nanos, AWS_TIMESTAMP_NANOS, AWS_TIMESTAMP_SECS, &nano); |
216 | |
217 | struct timespec tm = { |
218 | .tv_sec = seconds, |
219 | .tv_nsec = (long)nano, |
220 | }; |
221 | struct timespec output; |
222 | |
223 | nanosleep(&tm, &output); |
224 | } |
225 | |
226 | int aws_thread_current_at_exit(aws_thread_atexit_fn *callback, void *user_data) { |
227 | if (!tl_wrapper) { |
228 | return aws_raise_error(AWS_ERROR_THREAD_NOT_JOINABLE); |
229 | } |
230 | |
231 | struct thread_atexit_callback *cb = aws_mem_calloc(tl_wrapper->allocator, 1, sizeof(struct thread_atexit_callback)); |
232 | if (!cb) { |
233 | return AWS_OP_ERR; |
234 | } |
235 | cb->callback = callback; |
236 | cb->user_data = user_data; |
237 | cb->next = tl_wrapper->atexit; |
238 | tl_wrapper->atexit = cb; |
239 | return AWS_OP_SUCCESS; |
240 | } |
241 | |