The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2007 The Android Open Source Project |
| 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 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
The Android Open Source Project | 9adf84a | 2009-03-05 14:34:35 -0800 | [diff] [blame] | 17 | // #define LOG_NDEBUG 0 |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 18 | #define LOG_TAG "libutils.threads" |
| 19 | |
| 20 | #include <utils/threads.h> |
| 21 | #include <utils/Log.h> |
| 22 | |
Dianne Hackborn | 8c6cedc | 2009-12-07 17:59:37 -0800 | [diff] [blame] | 23 | #include <cutils/sched_policy.h> |
Dianne Hackborn | 7b0d45c | 2010-09-03 17:07:07 -0700 | [diff] [blame] | 24 | #include <cutils/properties.h> |
Dianne Hackborn | 8c6cedc | 2009-12-07 17:59:37 -0800 | [diff] [blame] | 25 | |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 26 | #include <stdio.h> |
| 27 | #include <stdlib.h> |
| 28 | #include <memory.h> |
| 29 | #include <errno.h> |
| 30 | #include <assert.h> |
| 31 | #include <unistd.h> |
| 32 | |
| 33 | #if defined(HAVE_PTHREADS) |
| 34 | # include <pthread.h> |
| 35 | # include <sched.h> |
| 36 | # include <sys/resource.h> |
Glenn Kasten | ba699cb | 2011-07-11 15:59:22 -0700 | [diff] [blame^] | 37 | #ifdef HAVE_ANDROID_OS |
| 38 | # include <bionic_pthread.h> |
| 39 | #endif |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 40 | #elif defined(HAVE_WIN32_THREADS) |
| 41 | # include <windows.h> |
| 42 | # include <stdint.h> |
| 43 | # include <process.h> |
| 44 | # define HAVE_CREATETHREAD // Cygwin, vs. HAVE__BEGINTHREADEX for MinGW |
| 45 | #endif |
| 46 | |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 47 | #if defined(HAVE_PRCTL) |
| 48 | #include <sys/prctl.h> |
| 49 | #endif |
| 50 | |
| 51 | /* |
| 52 | * =========================================================================== |
| 53 | * Thread wrappers |
| 54 | * =========================================================================== |
| 55 | */ |
| 56 | |
| 57 | using namespace android; |
| 58 | |
| 59 | // ---------------------------------------------------------------------------- |
| 60 | #if defined(HAVE_PTHREADS) |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 61 | // ---------------------------------------------------------------------------- |
| 62 | |
| 63 | /* |
Dianne Hackborn | 7b0d45c | 2010-09-03 17:07:07 -0700 | [diff] [blame] | 64 | * Create and run a new thread. |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 65 | * |
| 66 | * We create it "detached", so it cleans up after itself. |
| 67 | */ |
| 68 | |
| 69 | typedef void* (*android_pthread_entry)(void*); |
| 70 | |
Dianne Hackborn | 9c82c48 | 2010-09-09 15:50:18 -0700 | [diff] [blame] | 71 | static pthread_once_t gDoSchedulingGroupOnce = PTHREAD_ONCE_INIT; |
| 72 | static bool gDoSchedulingGroup = true; |
| 73 | |
| 74 | static void checkDoSchedulingGroup(void) { |
| 75 | char buf[PROPERTY_VALUE_MAX]; |
| 76 | int len = property_get("debug.sys.noschedgroups", buf, ""); |
| 77 | if (len > 0) { |
| 78 | int temp; |
| 79 | if (sscanf(buf, "%d", &temp) == 1) { |
| 80 | gDoSchedulingGroup = temp == 0; |
| 81 | } |
| 82 | } |
| 83 | } |
| 84 | |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 85 | struct thread_data_t { |
| 86 | thread_func_t entryFunction; |
| 87 | void* userData; |
| 88 | int priority; |
| 89 | char * threadName; |
| 90 | |
| 91 | // we use this trampoline when we need to set the priority with |
Glenn Kasten | ba699cb | 2011-07-11 15:59:22 -0700 | [diff] [blame^] | 92 | // nice/setpriority, and name with prctl. |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 93 | static int trampoline(const thread_data_t* t) { |
| 94 | thread_func_t f = t->entryFunction; |
| 95 | void* u = t->userData; |
| 96 | int prio = t->priority; |
| 97 | char * name = t->threadName; |
| 98 | delete t; |
| 99 | setpriority(PRIO_PROCESS, 0, prio); |
Dianne Hackborn | 9c82c48 | 2010-09-09 15:50:18 -0700 | [diff] [blame] | 100 | pthread_once(&gDoSchedulingGroupOnce, checkDoSchedulingGroup); |
| 101 | if (gDoSchedulingGroup) { |
| 102 | if (prio >= ANDROID_PRIORITY_BACKGROUND) { |
| 103 | set_sched_policy(androidGetTid(), SP_BACKGROUND); |
| 104 | } else { |
| 105 | set_sched_policy(androidGetTid(), SP_FOREGROUND); |
| 106 | } |
| 107 | } |
| 108 | |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 109 | if (name) { |
| 110 | #if defined(HAVE_PRCTL) |
| 111 | // Mac OS doesn't have this, and we build libutil for the host too |
| 112 | int hasAt = 0; |
| 113 | int hasDot = 0; |
| 114 | char *s = name; |
| 115 | while (*s) { |
| 116 | if (*s == '.') hasDot = 1; |
| 117 | else if (*s == '@') hasAt = 1; |
| 118 | s++; |
| 119 | } |
| 120 | int len = s - name; |
| 121 | if (len < 15 || hasAt || !hasDot) { |
| 122 | s = name; |
| 123 | } else { |
| 124 | s = name + len - 15; |
| 125 | } |
| 126 | prctl(PR_SET_NAME, (unsigned long) s, 0, 0, 0); |
| 127 | #endif |
| 128 | free(name); |
| 129 | } |
| 130 | return f(u); |
| 131 | } |
| 132 | }; |
| 133 | |
| 134 | int androidCreateRawThreadEtc(android_thread_func_t entryFunction, |
| 135 | void *userData, |
| 136 | const char* threadName, |
| 137 | int32_t threadPriority, |
| 138 | size_t threadStackSize, |
| 139 | android_thread_id_t *threadId) |
| 140 | { |
| 141 | pthread_attr_t attr; |
| 142 | pthread_attr_init(&attr); |
| 143 | pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); |
| 144 | |
| 145 | #ifdef HAVE_ANDROID_OS /* valgrind is rejecting RT-priority create reqs */ |
| 146 | if (threadPriority != PRIORITY_DEFAULT || threadName != NULL) { |
Glenn Kasten | ba699cb | 2011-07-11 15:59:22 -0700 | [diff] [blame^] | 147 | // Now that the pthread_t has a method to find the associated |
| 148 | // android_thread_id_t (pid) from pthread_t, it would be possible to avoid |
| 149 | // this trampoline in some cases as the parent could set the properties |
| 150 | // for the child. However, there would be a race condition because the |
| 151 | // child becomes ready immediately, and it doesn't work for the name. |
| 152 | // prctl(PR_SET_NAME) only works for self; prctl(PR_SET_THREAD_NAME) was |
| 153 | // proposed but not yet accepted. |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 154 | thread_data_t* t = new thread_data_t; |
| 155 | t->priority = threadPriority; |
| 156 | t->threadName = threadName ? strdup(threadName) : NULL; |
| 157 | t->entryFunction = entryFunction; |
| 158 | t->userData = userData; |
| 159 | entryFunction = (android_thread_func_t)&thread_data_t::trampoline; |
| 160 | userData = t; |
| 161 | } |
| 162 | #endif |
| 163 | |
| 164 | if (threadStackSize) { |
| 165 | pthread_attr_setstacksize(&attr, threadStackSize); |
| 166 | } |
| 167 | |
| 168 | errno = 0; |
| 169 | pthread_t thread; |
| 170 | int result = pthread_create(&thread, &attr, |
| 171 | (android_pthread_entry)entryFunction, userData); |
Le-Chun Wu | 3919950 | 2011-07-14 14:27:18 -0700 | [diff] [blame] | 172 | pthread_attr_destroy(&attr); |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 173 | if (result != 0) { |
Steve Block | e6f43dd | 2012-01-06 19:20:56 +0000 | [diff] [blame] | 174 | ALOGE("androidCreateRawThreadEtc failed (entry=%p, res=%d, errno=%d)\n" |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 175 | "(android threadPriority=%d)", |
| 176 | entryFunction, result, errno, threadPriority); |
| 177 | return 0; |
| 178 | } |
| 179 | |
Glenn Kasten | d9e1bb7 | 2011-06-02 08:59:28 -0700 | [diff] [blame] | 180 | // Note that *threadID is directly available to the parent only, as it is |
| 181 | // assigned after the child starts. Use memory barrier / lock if the child |
| 182 | // or other threads also need access. |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 183 | if (threadId != NULL) { |
| 184 | *threadId = (android_thread_id_t)thread; // XXX: this is not portable |
| 185 | } |
| 186 | return 1; |
| 187 | } |
| 188 | |
Glenn Kasten | ba699cb | 2011-07-11 15:59:22 -0700 | [diff] [blame^] | 189 | #ifdef HAVE_ANDROID_OS |
| 190 | static pthread_t android_thread_id_t_to_pthread(android_thread_id_t thread) |
| 191 | { |
| 192 | return (pthread_t) thread; |
| 193 | } |
| 194 | #endif |
| 195 | |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 196 | android_thread_id_t androidGetThreadId() |
| 197 | { |
| 198 | return (android_thread_id_t)pthread_self(); |
| 199 | } |
| 200 | |
| 201 | // ---------------------------------------------------------------------------- |
| 202 | #elif defined(HAVE_WIN32_THREADS) |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 203 | // ---------------------------------------------------------------------------- |
| 204 | |
| 205 | /* |
| 206 | * Trampoline to make us __stdcall-compliant. |
| 207 | * |
| 208 | * We're expected to delete "vDetails" when we're done. |
| 209 | */ |
| 210 | struct threadDetails { |
| 211 | int (*func)(void*); |
| 212 | void* arg; |
| 213 | }; |
| 214 | static __stdcall unsigned int threadIntermediary(void* vDetails) |
| 215 | { |
| 216 | struct threadDetails* pDetails = (struct threadDetails*) vDetails; |
| 217 | int result; |
| 218 | |
| 219 | result = (*(pDetails->func))(pDetails->arg); |
| 220 | |
| 221 | delete pDetails; |
| 222 | |
Steve Block | 9f76015 | 2011-10-12 17:27:03 +0100 | [diff] [blame] | 223 | ALOG(LOG_VERBOSE, "thread", "thread exiting\n"); |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 224 | return (unsigned int) result; |
| 225 | } |
| 226 | |
| 227 | /* |
| 228 | * Create and run a new thread. |
| 229 | */ |
| 230 | static bool doCreateThread(android_thread_func_t fn, void* arg, android_thread_id_t *id) |
| 231 | { |
| 232 | HANDLE hThread; |
| 233 | struct threadDetails* pDetails = new threadDetails; // must be on heap |
| 234 | unsigned int thrdaddr; |
| 235 | |
| 236 | pDetails->func = fn; |
| 237 | pDetails->arg = arg; |
| 238 | |
| 239 | #if defined(HAVE__BEGINTHREADEX) |
| 240 | hThread = (HANDLE) _beginthreadex(NULL, 0, threadIntermediary, pDetails, 0, |
| 241 | &thrdaddr); |
| 242 | if (hThread == 0) |
| 243 | #elif defined(HAVE_CREATETHREAD) |
| 244 | hThread = CreateThread(NULL, 0, |
| 245 | (LPTHREAD_START_ROUTINE) threadIntermediary, |
| 246 | (void*) pDetails, 0, (DWORD*) &thrdaddr); |
| 247 | if (hThread == NULL) |
| 248 | #endif |
| 249 | { |
Steve Block | 9f76015 | 2011-10-12 17:27:03 +0100 | [diff] [blame] | 250 | ALOG(LOG_WARN, "thread", "WARNING: thread create failed\n"); |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 251 | return false; |
| 252 | } |
| 253 | |
| 254 | #if defined(HAVE_CREATETHREAD) |
| 255 | /* close the management handle */ |
| 256 | CloseHandle(hThread); |
| 257 | #endif |
| 258 | |
| 259 | if (id != NULL) { |
| 260 | *id = (android_thread_id_t)thrdaddr; |
| 261 | } |
| 262 | |
| 263 | return true; |
| 264 | } |
| 265 | |
| 266 | int androidCreateRawThreadEtc(android_thread_func_t fn, |
| 267 | void *userData, |
| 268 | const char* threadName, |
| 269 | int32_t threadPriority, |
| 270 | size_t threadStackSize, |
| 271 | android_thread_id_t *threadId) |
| 272 | { |
| 273 | return doCreateThread( fn, userData, threadId); |
| 274 | } |
| 275 | |
| 276 | android_thread_id_t androidGetThreadId() |
| 277 | { |
| 278 | return (android_thread_id_t)GetCurrentThreadId(); |
| 279 | } |
| 280 | |
| 281 | // ---------------------------------------------------------------------------- |
| 282 | #else |
| 283 | #error "Threads not supported" |
| 284 | #endif |
| 285 | |
| 286 | // ---------------------------------------------------------------------------- |
| 287 | |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 288 | int androidCreateThread(android_thread_func_t fn, void* arg) |
| 289 | { |
| 290 | return createThreadEtc(fn, arg); |
| 291 | } |
| 292 | |
| 293 | int androidCreateThreadGetID(android_thread_func_t fn, void *arg, android_thread_id_t *id) |
| 294 | { |
| 295 | return createThreadEtc(fn, arg, "android:unnamed_thread", |
| 296 | PRIORITY_DEFAULT, 0, id); |
| 297 | } |
| 298 | |
| 299 | static android_create_thread_fn gCreateThreadFn = androidCreateRawThreadEtc; |
| 300 | |
| 301 | int androidCreateThreadEtc(android_thread_func_t entryFunction, |
| 302 | void *userData, |
| 303 | const char* threadName, |
| 304 | int32_t threadPriority, |
| 305 | size_t threadStackSize, |
| 306 | android_thread_id_t *threadId) |
| 307 | { |
| 308 | return gCreateThreadFn(entryFunction, userData, threadName, |
| 309 | threadPriority, threadStackSize, threadId); |
| 310 | } |
| 311 | |
| 312 | void androidSetCreateThreadFunc(android_create_thread_fn func) |
| 313 | { |
| 314 | gCreateThreadFn = func; |
| 315 | } |
| 316 | |
Dianne Hackborn | 8c6cedc | 2009-12-07 17:59:37 -0800 | [diff] [blame] | 317 | pid_t androidGetTid() |
| 318 | { |
| 319 | #ifdef HAVE_GETTID |
| 320 | return gettid(); |
| 321 | #else |
| 322 | return getpid(); |
| 323 | #endif |
| 324 | } |
| 325 | |
| 326 | int androidSetThreadSchedulingGroup(pid_t tid, int grp) |
| 327 | { |
| 328 | if (grp > ANDROID_TGROUP_MAX || grp < 0) { |
| 329 | return BAD_VALUE; |
| 330 | } |
| 331 | |
Dianne Hackborn | d0aecce | 2009-12-08 19:45:59 -0800 | [diff] [blame] | 332 | #if defined(HAVE_PTHREADS) |
Dianne Hackborn | 7b0d45c | 2010-09-03 17:07:07 -0700 | [diff] [blame] | 333 | pthread_once(&gDoSchedulingGroupOnce, checkDoSchedulingGroup); |
| 334 | if (gDoSchedulingGroup) { |
Glenn Kasten | ce63396 | 2011-06-22 17:42:23 -0700 | [diff] [blame] | 335 | // set_sched_policy does not support tid == 0 |
| 336 | if (tid == 0) { |
| 337 | tid = androidGetTid(); |
| 338 | } |
Dianne Hackborn | 7b0d45c | 2010-09-03 17:07:07 -0700 | [diff] [blame] | 339 | if (set_sched_policy(tid, (grp == ANDROID_TGROUP_BG_NONINTERACT) ? |
| 340 | SP_BACKGROUND : SP_FOREGROUND)) { |
| 341 | return PERMISSION_DENIED; |
| 342 | } |
Dianne Hackborn | 8c6cedc | 2009-12-07 17:59:37 -0800 | [diff] [blame] | 343 | } |
Dianne Hackborn | d0aecce | 2009-12-08 19:45:59 -0800 | [diff] [blame] | 344 | #endif |
Dianne Hackborn | 8c6cedc | 2009-12-07 17:59:37 -0800 | [diff] [blame] | 345 | |
| 346 | return NO_ERROR; |
| 347 | } |
| 348 | |
| 349 | int androidSetThreadPriority(pid_t tid, int pri) |
| 350 | { |
| 351 | int rc = 0; |
Dianne Hackborn | d0aecce | 2009-12-08 19:45:59 -0800 | [diff] [blame] | 352 | |
| 353 | #if defined(HAVE_PTHREADS) |
Dianne Hackborn | 8c6cedc | 2009-12-07 17:59:37 -0800 | [diff] [blame] | 354 | int lasterr = 0; |
| 355 | |
Dianne Hackborn | 7b0d45c | 2010-09-03 17:07:07 -0700 | [diff] [blame] | 356 | pthread_once(&gDoSchedulingGroupOnce, checkDoSchedulingGroup); |
| 357 | if (gDoSchedulingGroup) { |
Glenn Kasten | f0c4125 | 2011-06-14 10:35:34 -0700 | [diff] [blame] | 358 | // set_sched_policy does not support tid == 0 |
| 359 | int policy_tid; |
| 360 | if (tid == 0) { |
| 361 | policy_tid = androidGetTid(); |
| 362 | } else { |
| 363 | policy_tid = tid; |
| 364 | } |
Dianne Hackborn | 7b0d45c | 2010-09-03 17:07:07 -0700 | [diff] [blame] | 365 | if (pri >= ANDROID_PRIORITY_BACKGROUND) { |
Glenn Kasten | f0c4125 | 2011-06-14 10:35:34 -0700 | [diff] [blame] | 366 | rc = set_sched_policy(policy_tid, SP_BACKGROUND); |
Dianne Hackborn | 7b0d45c | 2010-09-03 17:07:07 -0700 | [diff] [blame] | 367 | } else if (getpriority(PRIO_PROCESS, tid) >= ANDROID_PRIORITY_BACKGROUND) { |
Glenn Kasten | f0c4125 | 2011-06-14 10:35:34 -0700 | [diff] [blame] | 368 | rc = set_sched_policy(policy_tid, SP_FOREGROUND); |
Dianne Hackborn | 7b0d45c | 2010-09-03 17:07:07 -0700 | [diff] [blame] | 369 | } |
Dianne Hackborn | 8c6cedc | 2009-12-07 17:59:37 -0800 | [diff] [blame] | 370 | } |
| 371 | |
| 372 | if (rc) { |
| 373 | lasterr = errno; |
| 374 | } |
| 375 | |
| 376 | if (setpriority(PRIO_PROCESS, tid, pri) < 0) { |
| 377 | rc = INVALID_OPERATION; |
| 378 | } else { |
| 379 | errno = lasterr; |
| 380 | } |
Dianne Hackborn | c5b1389 | 2009-12-08 16:38:01 -0800 | [diff] [blame] | 381 | #endif |
Dianne Hackborn | 8c6cedc | 2009-12-07 17:59:37 -0800 | [diff] [blame] | 382 | |
| 383 | return rc; |
| 384 | } |
| 385 | |
Andreas Huber | 1d60b96 | 2011-09-15 12:21:40 -0700 | [diff] [blame] | 386 | int androidGetThreadPriority(pid_t tid) { |
Andreas Huber | 9dbb77d | 2011-09-16 11:47:13 -0700 | [diff] [blame] | 387 | #if defined(HAVE_PTHREADS) |
Andreas Huber | 1d60b96 | 2011-09-15 12:21:40 -0700 | [diff] [blame] | 388 | return getpriority(PRIO_PROCESS, tid); |
Andreas Huber | 9dbb77d | 2011-09-16 11:47:13 -0700 | [diff] [blame] | 389 | #else |
| 390 | return ANDROID_PRIORITY_NORMAL; |
| 391 | #endif |
Andreas Huber | 1d60b96 | 2011-09-15 12:21:40 -0700 | [diff] [blame] | 392 | } |
| 393 | |
Glenn Kasten | 4fb2427 | 2011-06-22 16:20:37 -0700 | [diff] [blame] | 394 | int androidGetThreadSchedulingGroup(pid_t tid) |
| 395 | { |
| 396 | int ret = ANDROID_TGROUP_DEFAULT; |
| 397 | |
| 398 | #if defined(HAVE_PTHREADS) |
| 399 | // convention is to not call get/set_sched_policy methods if disabled by property |
| 400 | pthread_once(&gDoSchedulingGroupOnce, checkDoSchedulingGroup); |
| 401 | if (gDoSchedulingGroup) { |
| 402 | SchedPolicy policy; |
| 403 | // get_sched_policy does not support tid == 0 |
| 404 | if (tid == 0) { |
| 405 | tid = androidGetTid(); |
| 406 | } |
| 407 | if (get_sched_policy(tid, &policy) < 0) { |
| 408 | ret = INVALID_OPERATION; |
| 409 | } else { |
| 410 | switch (policy) { |
| 411 | case SP_BACKGROUND: |
| 412 | ret = ANDROID_TGROUP_BG_NONINTERACT; |
| 413 | break; |
| 414 | case SP_FOREGROUND: |
| 415 | ret = ANDROID_TGROUP_FG_BOOST; |
| 416 | break; |
| 417 | default: |
| 418 | // should not happen, as enum SchedPolicy does not have any other values |
| 419 | ret = INVALID_OPERATION; |
| 420 | break; |
| 421 | } |
| 422 | } |
| 423 | } |
| 424 | #endif |
| 425 | |
| 426 | return ret; |
| 427 | } |
| 428 | |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 429 | namespace android { |
| 430 | |
| 431 | /* |
| 432 | * =========================================================================== |
| 433 | * Mutex class |
| 434 | * =========================================================================== |
| 435 | */ |
| 436 | |
Mathias Agopian | ec0f1f6 | 2009-07-12 23:11:20 -0700 | [diff] [blame] | 437 | #if defined(HAVE_PTHREADS) |
| 438 | // implemented as inlines in threads.h |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 439 | #elif defined(HAVE_WIN32_THREADS) |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 440 | |
| 441 | Mutex::Mutex() |
| 442 | { |
| 443 | HANDLE hMutex; |
| 444 | |
| 445 | assert(sizeof(hMutex) == sizeof(mState)); |
| 446 | |
| 447 | hMutex = CreateMutex(NULL, FALSE, NULL); |
| 448 | mState = (void*) hMutex; |
| 449 | } |
| 450 | |
| 451 | Mutex::Mutex(const char* name) |
| 452 | { |
| 453 | // XXX: name not used for now |
| 454 | HANDLE hMutex; |
| 455 | |
David 'Digit' Turner | 429db15 | 2009-08-01 00:20:17 +0200 | [diff] [blame] | 456 | assert(sizeof(hMutex) == sizeof(mState)); |
| 457 | |
| 458 | hMutex = CreateMutex(NULL, FALSE, NULL); |
| 459 | mState = (void*) hMutex; |
| 460 | } |
| 461 | |
| 462 | Mutex::Mutex(int type, const char* name) |
| 463 | { |
| 464 | // XXX: type and name not used for now |
| 465 | HANDLE hMutex; |
| 466 | |
| 467 | assert(sizeof(hMutex) == sizeof(mState)); |
| 468 | |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 469 | hMutex = CreateMutex(NULL, FALSE, NULL); |
| 470 | mState = (void*) hMutex; |
| 471 | } |
| 472 | |
| 473 | Mutex::~Mutex() |
| 474 | { |
| 475 | CloseHandle((HANDLE) mState); |
| 476 | } |
| 477 | |
| 478 | status_t Mutex::lock() |
| 479 | { |
| 480 | DWORD dwWaitResult; |
| 481 | dwWaitResult = WaitForSingleObject((HANDLE) mState, INFINITE); |
| 482 | return dwWaitResult != WAIT_OBJECT_0 ? -1 : NO_ERROR; |
| 483 | } |
| 484 | |
| 485 | void Mutex::unlock() |
| 486 | { |
| 487 | if (!ReleaseMutex((HANDLE) mState)) |
Steve Block | 9f76015 | 2011-10-12 17:27:03 +0100 | [diff] [blame] | 488 | ALOG(LOG_WARN, "thread", "WARNING: bad result from unlocking mutex\n"); |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 489 | } |
| 490 | |
| 491 | status_t Mutex::tryLock() |
| 492 | { |
| 493 | DWORD dwWaitResult; |
| 494 | |
| 495 | dwWaitResult = WaitForSingleObject((HANDLE) mState, 0); |
| 496 | if (dwWaitResult != WAIT_OBJECT_0 && dwWaitResult != WAIT_TIMEOUT) |
Steve Block | 9f76015 | 2011-10-12 17:27:03 +0100 | [diff] [blame] | 497 | ALOG(LOG_WARN, "thread", "WARNING: bad result from try-locking mutex\n"); |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 498 | return (dwWaitResult == WAIT_OBJECT_0) ? 0 : -1; |
| 499 | } |
| 500 | |
| 501 | #else |
| 502 | #error "Somebody forgot to implement threads for this platform." |
| 503 | #endif |
| 504 | |
| 505 | |
| 506 | /* |
| 507 | * =========================================================================== |
| 508 | * Condition class |
| 509 | * =========================================================================== |
| 510 | */ |
| 511 | |
Mathias Agopian | ec0f1f6 | 2009-07-12 23:11:20 -0700 | [diff] [blame] | 512 | #if defined(HAVE_PTHREADS) |
| 513 | // implemented as inlines in threads.h |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 514 | #elif defined(HAVE_WIN32_THREADS) |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 515 | |
| 516 | /* |
| 517 | * Windows doesn't have a condition variable solution. It's possible |
| 518 | * to create one, but it's easy to get it wrong. For a discussion, and |
| 519 | * the origin of this implementation, see: |
| 520 | * |
| 521 | * http://www.cs.wustl.edu/~schmidt/win32-cv-1.html |
| 522 | * |
| 523 | * The implementation shown on the page does NOT follow POSIX semantics. |
| 524 | * As an optimization they require acquiring the external mutex before |
| 525 | * calling signal() and broadcast(), whereas POSIX only requires grabbing |
| 526 | * it before calling wait(). The implementation here has been un-optimized |
| 527 | * to have the correct behavior. |
| 528 | */ |
| 529 | typedef struct WinCondition { |
| 530 | // Number of waiting threads. |
| 531 | int waitersCount; |
| 532 | |
| 533 | // Serialize access to waitersCount. |
| 534 | CRITICAL_SECTION waitersCountLock; |
| 535 | |
| 536 | // Semaphore used to queue up threads waiting for the condition to |
| 537 | // become signaled. |
| 538 | HANDLE sema; |
| 539 | |
| 540 | // An auto-reset event used by the broadcast/signal thread to wait |
| 541 | // for all the waiting thread(s) to wake up and be released from |
| 542 | // the semaphore. |
| 543 | HANDLE waitersDone; |
| 544 | |
| 545 | // This mutex wouldn't be necessary if we required that the caller |
| 546 | // lock the external mutex before calling signal() and broadcast(). |
| 547 | // I'm trying to mimic pthread semantics though. |
| 548 | HANDLE internalMutex; |
| 549 | |
| 550 | // Keeps track of whether we were broadcasting or signaling. This |
| 551 | // allows us to optimize the code if we're just signaling. |
| 552 | bool wasBroadcast; |
| 553 | |
| 554 | status_t wait(WinCondition* condState, HANDLE hMutex, nsecs_t* abstime) |
| 555 | { |
| 556 | // Increment the wait count, avoiding race conditions. |
| 557 | EnterCriticalSection(&condState->waitersCountLock); |
| 558 | condState->waitersCount++; |
| 559 | //printf("+++ wait: incr waitersCount to %d (tid=%ld)\n", |
| 560 | // condState->waitersCount, getThreadId()); |
| 561 | LeaveCriticalSection(&condState->waitersCountLock); |
| 562 | |
| 563 | DWORD timeout = INFINITE; |
| 564 | if (abstime) { |
| 565 | nsecs_t reltime = *abstime - systemTime(); |
| 566 | if (reltime < 0) |
| 567 | reltime = 0; |
| 568 | timeout = reltime/1000000; |
| 569 | } |
| 570 | |
| 571 | // Atomically release the external mutex and wait on the semaphore. |
| 572 | DWORD res = |
| 573 | SignalObjectAndWait(hMutex, condState->sema, timeout, FALSE); |
| 574 | |
| 575 | //printf("+++ wait: awake (tid=%ld)\n", getThreadId()); |
| 576 | |
| 577 | // Reacquire lock to avoid race conditions. |
| 578 | EnterCriticalSection(&condState->waitersCountLock); |
| 579 | |
| 580 | // No longer waiting. |
| 581 | condState->waitersCount--; |
| 582 | |
| 583 | // Check to see if we're the last waiter after a broadcast. |
| 584 | bool lastWaiter = (condState->wasBroadcast && condState->waitersCount == 0); |
| 585 | |
| 586 | //printf("+++ wait: lastWaiter=%d (wasBc=%d wc=%d)\n", |
| 587 | // lastWaiter, condState->wasBroadcast, condState->waitersCount); |
| 588 | |
| 589 | LeaveCriticalSection(&condState->waitersCountLock); |
| 590 | |
| 591 | // If we're the last waiter thread during this particular broadcast |
| 592 | // then signal broadcast() that we're all awake. It'll drop the |
| 593 | // internal mutex. |
| 594 | if (lastWaiter) { |
| 595 | // Atomically signal the "waitersDone" event and wait until we |
| 596 | // can acquire the internal mutex. We want to do this in one step |
| 597 | // because it ensures that everybody is in the mutex FIFO before |
| 598 | // any thread has a chance to run. Without it, another thread |
| 599 | // could wake up, do work, and hop back in ahead of us. |
| 600 | SignalObjectAndWait(condState->waitersDone, condState->internalMutex, |
| 601 | INFINITE, FALSE); |
| 602 | } else { |
| 603 | // Grab the internal mutex. |
| 604 | WaitForSingleObject(condState->internalMutex, INFINITE); |
| 605 | } |
| 606 | |
| 607 | // Release the internal and grab the external. |
| 608 | ReleaseMutex(condState->internalMutex); |
| 609 | WaitForSingleObject(hMutex, INFINITE); |
| 610 | |
| 611 | return res == WAIT_OBJECT_0 ? NO_ERROR : -1; |
| 612 | } |
| 613 | } WinCondition; |
| 614 | |
| 615 | /* |
| 616 | * Constructor. Set up the WinCondition stuff. |
| 617 | */ |
| 618 | Condition::Condition() |
| 619 | { |
| 620 | WinCondition* condState = new WinCondition; |
| 621 | |
| 622 | condState->waitersCount = 0; |
| 623 | condState->wasBroadcast = false; |
| 624 | // semaphore: no security, initial value of 0 |
| 625 | condState->sema = CreateSemaphore(NULL, 0, 0x7fffffff, NULL); |
| 626 | InitializeCriticalSection(&condState->waitersCountLock); |
| 627 | // auto-reset event, not signaled initially |
| 628 | condState->waitersDone = CreateEvent(NULL, FALSE, FALSE, NULL); |
| 629 | // used so we don't have to lock external mutex on signal/broadcast |
| 630 | condState->internalMutex = CreateMutex(NULL, FALSE, NULL); |
| 631 | |
| 632 | mState = condState; |
| 633 | } |
| 634 | |
| 635 | /* |
| 636 | * Destructor. Free Windows resources as well as our allocated storage. |
| 637 | */ |
| 638 | Condition::~Condition() |
| 639 | { |
| 640 | WinCondition* condState = (WinCondition*) mState; |
| 641 | if (condState != NULL) { |
| 642 | CloseHandle(condState->sema); |
| 643 | CloseHandle(condState->waitersDone); |
| 644 | delete condState; |
| 645 | } |
| 646 | } |
| 647 | |
| 648 | |
| 649 | status_t Condition::wait(Mutex& mutex) |
| 650 | { |
| 651 | WinCondition* condState = (WinCondition*) mState; |
| 652 | HANDLE hMutex = (HANDLE) mutex.mState; |
| 653 | |
| 654 | return ((WinCondition*)mState)->wait(condState, hMutex, NULL); |
| 655 | } |
| 656 | |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 657 | status_t Condition::waitRelative(Mutex& mutex, nsecs_t reltime) |
| 658 | { |
David 'Digit' Turner | 429db15 | 2009-08-01 00:20:17 +0200 | [diff] [blame] | 659 | WinCondition* condState = (WinCondition*) mState; |
| 660 | HANDLE hMutex = (HANDLE) mutex.mState; |
| 661 | nsecs_t absTime = systemTime()+reltime; |
| 662 | |
| 663 | return ((WinCondition*)mState)->wait(condState, hMutex, &absTime); |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 664 | } |
| 665 | |
| 666 | /* |
| 667 | * Signal the condition variable, allowing one thread to continue. |
| 668 | */ |
| 669 | void Condition::signal() |
| 670 | { |
| 671 | WinCondition* condState = (WinCondition*) mState; |
| 672 | |
| 673 | // Lock the internal mutex. This ensures that we don't clash with |
| 674 | // broadcast(). |
| 675 | WaitForSingleObject(condState->internalMutex, INFINITE); |
| 676 | |
| 677 | EnterCriticalSection(&condState->waitersCountLock); |
| 678 | bool haveWaiters = (condState->waitersCount > 0); |
| 679 | LeaveCriticalSection(&condState->waitersCountLock); |
| 680 | |
| 681 | // If no waiters, then this is a no-op. Otherwise, knock the semaphore |
| 682 | // down a notch. |
| 683 | if (haveWaiters) |
| 684 | ReleaseSemaphore(condState->sema, 1, 0); |
| 685 | |
| 686 | // Release internal mutex. |
| 687 | ReleaseMutex(condState->internalMutex); |
| 688 | } |
| 689 | |
| 690 | /* |
| 691 | * Signal the condition variable, allowing all threads to continue. |
| 692 | * |
| 693 | * First we have to wake up all threads waiting on the semaphore, then |
| 694 | * we wait until all of the threads have actually been woken before |
| 695 | * releasing the internal mutex. This ensures that all threads are woken. |
| 696 | */ |
| 697 | void Condition::broadcast() |
| 698 | { |
| 699 | WinCondition* condState = (WinCondition*) mState; |
| 700 | |
| 701 | // Lock the internal mutex. This keeps the guys we're waking up |
| 702 | // from getting too far. |
| 703 | WaitForSingleObject(condState->internalMutex, INFINITE); |
| 704 | |
| 705 | EnterCriticalSection(&condState->waitersCountLock); |
| 706 | bool haveWaiters = false; |
| 707 | |
| 708 | if (condState->waitersCount > 0) { |
| 709 | haveWaiters = true; |
| 710 | condState->wasBroadcast = true; |
| 711 | } |
| 712 | |
| 713 | if (haveWaiters) { |
| 714 | // Wake up all the waiters. |
| 715 | ReleaseSemaphore(condState->sema, condState->waitersCount, 0); |
| 716 | |
| 717 | LeaveCriticalSection(&condState->waitersCountLock); |
| 718 | |
| 719 | // Wait for all awakened threads to acquire the counting semaphore. |
| 720 | // The last guy who was waiting sets this. |
| 721 | WaitForSingleObject(condState->waitersDone, INFINITE); |
| 722 | |
| 723 | // Reset wasBroadcast. (No crit section needed because nobody |
| 724 | // else can wake up to poke at it.) |
| 725 | condState->wasBroadcast = 0; |
| 726 | } else { |
| 727 | // nothing to do |
| 728 | LeaveCriticalSection(&condState->waitersCountLock); |
| 729 | } |
| 730 | |
| 731 | // Release internal mutex. |
| 732 | ReleaseMutex(condState->internalMutex); |
| 733 | } |
| 734 | |
| 735 | #else |
| 736 | #error "condition variables not supported on this platform" |
| 737 | #endif |
| 738 | |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 739 | // ---------------------------------------------------------------------------- |
| 740 | |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 741 | /* |
| 742 | * This is our thread object! |
| 743 | */ |
| 744 | |
| 745 | Thread::Thread(bool canCallJava) |
| 746 | : mCanCallJava(canCallJava), |
| 747 | mThread(thread_id_t(-1)), |
| 748 | mLock("Thread::mLock"), |
| 749 | mStatus(NO_ERROR), |
| 750 | mExitPending(false), mRunning(false) |
Glenn Kasten | 7e453a5 | 2011-02-01 11:32:29 -0800 | [diff] [blame] | 751 | #ifdef HAVE_ANDROID_OS |
| 752 | , mTid(-1) |
| 753 | #endif |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 754 | { |
| 755 | } |
| 756 | |
| 757 | Thread::~Thread() |
| 758 | { |
| 759 | } |
| 760 | |
| 761 | status_t Thread::readyToRun() |
| 762 | { |
| 763 | return NO_ERROR; |
| 764 | } |
| 765 | |
| 766 | status_t Thread::run(const char* name, int32_t priority, size_t stack) |
| 767 | { |
| 768 | Mutex::Autolock _l(mLock); |
| 769 | |
| 770 | if (mRunning) { |
| 771 | // thread already started |
| 772 | return INVALID_OPERATION; |
| 773 | } |
| 774 | |
| 775 | // reset status and exitPending to their default value, so we can |
| 776 | // try again after an error happened (either below, or in readyToRun()) |
| 777 | mStatus = NO_ERROR; |
| 778 | mExitPending = false; |
| 779 | mThread = thread_id_t(-1); |
| 780 | |
| 781 | // hold a strong reference on ourself |
| 782 | mHoldSelf = this; |
| 783 | |
The Android Open Source Project | 9adf84a | 2009-03-05 14:34:35 -0800 | [diff] [blame] | 784 | mRunning = true; |
| 785 | |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 786 | bool res; |
| 787 | if (mCanCallJava) { |
| 788 | res = createThreadEtc(_threadLoop, |
| 789 | this, name, priority, stack, &mThread); |
| 790 | } else { |
| 791 | res = androidCreateRawThreadEtc(_threadLoop, |
| 792 | this, name, priority, stack, &mThread); |
| 793 | } |
| 794 | |
| 795 | if (res == false) { |
| 796 | mStatus = UNKNOWN_ERROR; // something happened! |
| 797 | mRunning = false; |
| 798 | mThread = thread_id_t(-1); |
The Android Open Source Project | 9adf84a | 2009-03-05 14:34:35 -0800 | [diff] [blame] | 799 | mHoldSelf.clear(); // "this" may have gone away after this. |
| 800 | |
| 801 | return UNKNOWN_ERROR; |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 802 | } |
| 803 | |
The Android Open Source Project | 9adf84a | 2009-03-05 14:34:35 -0800 | [diff] [blame] | 804 | // Do not refer to mStatus here: The thread is already running (may, in fact |
| 805 | // already have exited with a valid mStatus result). The NO_ERROR indication |
| 806 | // here merely indicates successfully starting the thread and does not |
| 807 | // imply successful termination/execution. |
| 808 | return NO_ERROR; |
Glenn Kasten | 7e453a5 | 2011-02-01 11:32:29 -0800 | [diff] [blame] | 809 | |
| 810 | // Exiting scope of mLock is a memory barrier and allows new thread to run |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 811 | } |
| 812 | |
| 813 | int Thread::_threadLoop(void* user) |
| 814 | { |
| 815 | Thread* const self = static_cast<Thread*>(user); |
Glenn Kasten | 7e453a5 | 2011-02-01 11:32:29 -0800 | [diff] [blame] | 816 | |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 817 | sp<Thread> strong(self->mHoldSelf); |
| 818 | wp<Thread> weak(strong); |
| 819 | self->mHoldSelf.clear(); |
| 820 | |
Kenny Root | af1cf07 | 2011-02-16 10:13:53 -0800 | [diff] [blame] | 821 | #ifdef HAVE_ANDROID_OS |
Mathias Agopian | 4de4ebf | 2009-09-09 02:38:13 -0700 | [diff] [blame] | 822 | // this is very useful for debugging with gdb |
| 823 | self->mTid = gettid(); |
| 824 | #endif |
| 825 | |
The Android Open Source Project | 9adf84a | 2009-03-05 14:34:35 -0800 | [diff] [blame] | 826 | bool first = true; |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 827 | |
| 828 | do { |
The Android Open Source Project | 9adf84a | 2009-03-05 14:34:35 -0800 | [diff] [blame] | 829 | bool result; |
| 830 | if (first) { |
| 831 | first = false; |
| 832 | self->mStatus = self->readyToRun(); |
| 833 | result = (self->mStatus == NO_ERROR); |
| 834 | |
Glenn Kasten | 7e453a5 | 2011-02-01 11:32:29 -0800 | [diff] [blame] | 835 | if (result && !self->exitPending()) { |
The Android Open Source Project | 9adf84a | 2009-03-05 14:34:35 -0800 | [diff] [blame] | 836 | // Binder threads (and maybe others) rely on threadLoop |
| 837 | // running at least once after a successful ::readyToRun() |
| 838 | // (unless, of course, the thread has already been asked to exit |
| 839 | // at that point). |
| 840 | // This is because threads are essentially used like this: |
| 841 | // (new ThreadSubclass())->run(); |
| 842 | // The caller therefore does not retain a strong reference to |
| 843 | // the thread and the thread would simply disappear after the |
| 844 | // successful ::readyToRun() call instead of entering the |
| 845 | // threadLoop at least once. |
| 846 | result = self->threadLoop(); |
| 847 | } |
| 848 | } else { |
| 849 | result = self->threadLoop(); |
| 850 | } |
| 851 | |
Glenn Kasten | 7e453a5 | 2011-02-01 11:32:29 -0800 | [diff] [blame] | 852 | // establish a scope for mLock |
| 853 | { |
| 854 | Mutex::Autolock _l(self->mLock); |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 855 | if (result == false || self->mExitPending) { |
| 856 | self->mExitPending = true; |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 857 | self->mRunning = false; |
Eric Laurent | a017d5b | 2011-01-04 11:58:04 -0800 | [diff] [blame] | 858 | // clear thread ID so that requestExitAndWait() does not exit if |
| 859 | // called by a new thread using the same thread ID as this one. |
| 860 | self->mThread = thread_id_t(-1); |
Glenn Kasten | 7e453a5 | 2011-02-01 11:32:29 -0800 | [diff] [blame] | 861 | // note that interested observers blocked in requestExitAndWait are |
| 862 | // awoken by broadcast, but blocked on mLock until break exits scope |
Mathias Agopian | 4de4ebf | 2009-09-09 02:38:13 -0700 | [diff] [blame] | 863 | self->mThreadExitedCondition.broadcast(); |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 864 | break; |
| 865 | } |
Glenn Kasten | 7e453a5 | 2011-02-01 11:32:29 -0800 | [diff] [blame] | 866 | } |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 867 | |
| 868 | // Release our strong reference, to let a chance to the thread |
| 869 | // to die a peaceful death. |
| 870 | strong.clear(); |
Mathias Agopian | 4de4ebf | 2009-09-09 02:38:13 -0700 | [diff] [blame] | 871 | // And immediately, re-acquire a strong reference for the next loop |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 872 | strong = weak.promote(); |
| 873 | } while(strong != 0); |
| 874 | |
| 875 | return 0; |
| 876 | } |
| 877 | |
| 878 | void Thread::requestExit() |
| 879 | { |
Glenn Kasten | 7e453a5 | 2011-02-01 11:32:29 -0800 | [diff] [blame] | 880 | Mutex::Autolock _l(mLock); |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 881 | mExitPending = true; |
| 882 | } |
| 883 | |
| 884 | status_t Thread::requestExitAndWait() |
| 885 | { |
Glenn Kasten | d9e1bb7 | 2011-06-02 08:59:28 -0700 | [diff] [blame] | 886 | Mutex::Autolock _l(mLock); |
The Android Open Source Project | 9adf84a | 2009-03-05 14:34:35 -0800 | [diff] [blame] | 887 | if (mThread == getThreadId()) { |
Steve Block | 32397c1 | 2012-01-05 23:22:43 +0000 | [diff] [blame] | 888 | ALOGW( |
The Android Open Source Project | 9adf84a | 2009-03-05 14:34:35 -0800 | [diff] [blame] | 889 | "Thread (this=%p): don't call waitForExit() from this " |
| 890 | "Thread object's thread. It's a guaranteed deadlock!", |
| 891 | this); |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 892 | |
The Android Open Source Project | 9adf84a | 2009-03-05 14:34:35 -0800 | [diff] [blame] | 893 | return WOULD_BLOCK; |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 894 | } |
The Android Open Source Project | 9adf84a | 2009-03-05 14:34:35 -0800 | [diff] [blame] | 895 | |
Glenn Kasten | d9e1bb7 | 2011-06-02 08:59:28 -0700 | [diff] [blame] | 896 | mExitPending = true; |
The Android Open Source Project | 9adf84a | 2009-03-05 14:34:35 -0800 | [diff] [blame] | 897 | |
The Android Open Source Project | 9adf84a | 2009-03-05 14:34:35 -0800 | [diff] [blame] | 898 | while (mRunning == true) { |
| 899 | mThreadExitedCondition.wait(mLock); |
| 900 | } |
Glenn Kasten | 7e453a5 | 2011-02-01 11:32:29 -0800 | [diff] [blame] | 901 | // This next line is probably not needed any more, but is being left for |
| 902 | // historical reference. Note that each interested party will clear flag. |
The Android Open Source Project | 9adf84a | 2009-03-05 14:34:35 -0800 | [diff] [blame] | 903 | mExitPending = false; |
| 904 | |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 905 | return mStatus; |
| 906 | } |
| 907 | |
Glenn Kasten | 58e012d | 2011-06-23 12:55:29 -0700 | [diff] [blame] | 908 | status_t Thread::join() |
| 909 | { |
| 910 | Mutex::Autolock _l(mLock); |
| 911 | if (mThread == getThreadId()) { |
Steve Block | 32397c1 | 2012-01-05 23:22:43 +0000 | [diff] [blame] | 912 | ALOGW( |
Glenn Kasten | 58e012d | 2011-06-23 12:55:29 -0700 | [diff] [blame] | 913 | "Thread (this=%p): don't call join() from this " |
| 914 | "Thread object's thread. It's a guaranteed deadlock!", |
| 915 | this); |
| 916 | |
| 917 | return WOULD_BLOCK; |
| 918 | } |
| 919 | |
| 920 | while (mRunning == true) { |
| 921 | mThreadExitedCondition.wait(mLock); |
| 922 | } |
| 923 | |
| 924 | return mStatus; |
| 925 | } |
| 926 | |
Glenn Kasten | ba699cb | 2011-07-11 15:59:22 -0700 | [diff] [blame^] | 927 | #ifdef HAVE_ANDROID_OS |
| 928 | pid_t Thread::getTid() const |
| 929 | { |
| 930 | // mTid is not defined until the child initializes it, and the caller may need it earlier |
| 931 | Mutex::Autolock _l(mLock); |
| 932 | pid_t tid; |
| 933 | if (mRunning) { |
| 934 | pthread_t pthread = android_thread_id_t_to_pthread(mThread); |
| 935 | tid = __pthread_gettid(pthread); |
| 936 | } else { |
| 937 | ALOGW("Thread (this=%p): getTid() is undefined before run()", this); |
| 938 | tid = -1; |
| 939 | } |
| 940 | return tid; |
| 941 | } |
| 942 | #endif |
| 943 | |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 944 | bool Thread::exitPending() const |
| 945 | { |
Glenn Kasten | 7e453a5 | 2011-02-01 11:32:29 -0800 | [diff] [blame] | 946 | Mutex::Autolock _l(mLock); |
The Android Open Source Project | edbf3b6 | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 947 | return mExitPending; |
| 948 | } |
| 949 | |
| 950 | |
| 951 | |
| 952 | }; // namespace android |