src/system/libroot/posix/pthread/pthread.cpp

   1 /*
   2  * Copyright 2008-2009, Axel Dörfler, axeld@pinc-software.de.
   3  * Copyright 2006, Jérôme Duval. All rights reserved.
   4  * Distributed under the terms of the MIT License.
   5  */
   6
   7
   8 #include "pthread_private.h"
   9
  10 #include <signal.h>
  11 #include <stdlib.h>
  12 #include <string.h>
  13
  14 #include <TLS.h>
  15
  16 #include <syscall_utils.h>
  17
  18 #include <libroot_private.h>
  19 #include <syscalls.h>
  20 #include <thread_defs.h>
  21 #include <tls.h>
  22
  23 #include <user_thread.h>
  24
  25
  26 static const pthread_attr pthread_attr_default = {
  27         PTHREAD_CREATE_JOINABLE,
  28         B_NORMAL_PRIORITY,
  29         USER_STACK_SIZE,
  30         USER_STACK_GUARD_SIZE
  31 };
  32
  33
  34 static pthread_thread sMainThread;
  35 static int sConcurrencyLevel;
  36
  37
  38 static status_t
  39 pthread_thread_entry(void*, void* _thread)
  40 {
  41         pthread_thread* thread = (pthread_thread*)_thread;
  42
  43         pthread_exit(thread->entry(thread->entry_argument));
  44         return 0;
  45 }
  46
  47
  48 // #pragma mark - private API
  49
  50
  51 void
  52 __pthread_destroy_thread(void)
  53 {
  54         pthread_thread* thread = pthread_self();
  55
  56         // call cleanup handlers
  57         while (true) {
  58                 struct __pthread_cleanup_handler* handler
  59                         = __pthread_cleanup_pop_handler();
  60                 if (handler == NULL)
  61                         break;
  62
  63                 handler->function(handler->argument);
  64         }
  65
  66         __pthread_key_call_destructors(thread);
  67
  68         if ((atomic_or(&thread->flags, THREAD_DEAD) & THREAD_DETACHED) != 0)
  69                 free(thread);
  70 }
  71
  72
  73 pthread_thread*
  74 __allocate_pthread(void* (*entry)(void*), void *data)
  75 {
  76         pthread_thread* thread = (pthread_thread*)malloc(sizeof(pthread_thread));
  77         if (thread == NULL)
  78                 return NULL;
  79
  80         __init_pthread(thread, entry, data);
  81
  82         return thread;
  83 }
  84
  85
  86 void
  87 __init_pthread(pthread_thread* thread, void* (*entry)(void*), void* data)
  88 {
  89         thread->entry = entry;
  90         thread->entry_argument = data;
  91         thread->exit_value = NULL;
  92         thread->cleanup_handlers = NULL;
  93         thread->flags = THREAD_CANCEL_ENABLED;
  94                 // thread cancellation enabled, but deferred
  95
  96         memset(thread->specific, 0, sizeof(thread->specific));
  97 }
  98
  99
 100 status_t
 101 __pthread_init_creation_attributes(const pthread_attr_t* pthreadAttributes,
 102         pthread_t thread, status_t (*entryFunction)(void*, void*),
 103         void* argument1, void* argument2, const char* name,
 104         thread_creation_attributes* attributes)
 105 {
 106         const pthread_attr* attr = NULL;
 107         if (pthreadAttributes == NULL) {
 108                 attr = &pthread_attr_default;
 109         } else {
 110                 attr = *pthreadAttributes;
 111                 if (attr == NULL)
 112                         return EINVAL;
 113         }
 114
 115         attributes->entry = entryFunction;
 116         attributes->name = name;
 117         attributes->priority = attr->sched_priority;
 118         attributes->args1 = argument1;
 119         attributes->args2 = argument2;
 120         attributes->stack_address = NULL;
 121         attributes->stack_size = attr->stack_size;
 122         attributes->guard_size = attr->guard_size;
 123         attributes->pthread = thread;
 124         attributes->flags = 0;
 125
 126         if (thread != NULL && attr->detach_state == PTHREAD_CREATE_DETACHED)
 127                 thread->flags |= THREAD_DETACHED;
 128
 129         return B_OK;
 130 }
 131
 132
 133 // #pragma mark - public API
 134
 135
 136 int
 137 pthread_create(pthread_t* _thread, const pthread_attr_t* attr,
 138         void* (*startRoutine)(void*), void* arg)
 139 {
 140         if (_thread == NULL)
 141                 return EINVAL;
 142
 143         pthread_thread* thread = __allocate_pthread(startRoutine, arg);
 144         if (thread == NULL)
 145                 return EAGAIN;
 146
 147         thread_creation_attributes attributes;
 148         status_t error = __pthread_init_creation_attributes(attr, thread,
 149                 &pthread_thread_entry, NULL, thread, "pthread func", &attributes);
 150         if (error != B_OK) {
 151                 free(thread);
 152                 return error;
 153         }
 154
 155         thread->id = _kern_spawn_thread(&attributes);
 156         if (thread->id < 0) {
 157                 // stupid error code but demanded by POSIX
 158                 free(thread);
 159                 return EAGAIN;
 160         }
 161
 162         __set_stack_protection();
 163         resume_thread(thread->id);
 164         *_thread = thread;
 165
 166         return 0;
 167 }
 168
 169
 170 pthread_t
 171 pthread_self(void)
 172 {
 173         pthread_thread* thread = get_user_thread()->pthread;
 174         if (thread == NULL)
 175                 return &sMainThread;
 176
 177         return thread;
 178 }
 179
 180
 181 int
 182 pthread_equal(pthread_t t1, pthread_t t2)
 183 {
 184         return t1 == t2;
 185 }
 186
 187
 188 int
 189 pthread_join(pthread_t thread, void** _value)
 190 {
 191         status_t dummy;
 192         status_t error;
 193         do {
 194                 error = wait_for_thread(thread->id, &dummy);
 195         } while (error == B_INTERRUPTED);
 196
 197         if (error == B_BAD_THREAD_ID)
 198                 RETURN_AND_TEST_CANCEL(ESRCH);
 199
 200         if (_value != NULL)
 201                 *_value = thread->exit_value;
 202
 203         if ((atomic_or(&thread->flags, THREAD_DETACHED) & THREAD_DEAD) != 0)
 204                 free(thread);
 205
 206         RETURN_AND_TEST_CANCEL(error);
 207 }
 208
 209
 210 void
 211 pthread_exit(void* value)
 212 {
 213         pthread_self()->exit_value = value;
 214         exit_thread(B_OK);
 215 }
 216
 217
 218 int
 219 pthread_kill(pthread_t thread, int sig)
 220 {
 221         status_t status = send_signal(thread->id, (uint)sig);
 222         if (status != B_OK) {
 223                 if (status == B_BAD_THREAD_ID)
 224                         return ESRCH;
 225
 226                 return status;
 227         }
 228
 229         return 0;
 230 }
 231
 232
 233 int
 234 pthread_detach(pthread_t thread)
 235 {
 236         int32 flags;
 237
 238         if (thread == NULL)
 239                 return EINVAL;
 240
 241         flags = atomic_or(&thread->flags, THREAD_DETACHED);
 242         if ((flags & THREAD_DETACHED) != 0)
 243                 return 0;
 244
 245         if ((flags & THREAD_DEAD) != 0)
 246                 free(thread);
 247
 248         return 0;
 249 }
 250
 251
 252 int
 253 pthread_getconcurrency(void)
 254 {
 255         return sConcurrencyLevel;
 256 }
 257
 258
 259 int
 260 pthread_setconcurrency(int newLevel)
 261 {
 262         if (newLevel < 0)
 263                 return EINVAL;
 264
 265         sConcurrencyLevel = newLevel;
 266         return 0;
 267 }
 268
 269
 270 int
 271 pthread_getschedparam(pthread_t thread, int *policy, struct sched_param *param)
 272 {
 273         thread_info info;
 274         status_t status = _kern_get_thread_info(thread->id, &info);
 275         if (status == B_BAD_THREAD_ID)
 276                 return ESRCH;
 277         param->sched_priority = info.priority;
 278         if (policy != NULL)
 279                 *policy = SCHED_RR;
 280         return 0;
 281 }
 282
 283
 284 int
 285 pthread_setschedparam(pthread_t thread, int policy,
 286         const struct sched_param *param)
 287 {
 288         status_t status;
 289         if (policy != SCHED_RR)
 290                 return ENOTSUP;
 291         status = _kern_set_thread_priority(thread->id, param->sched_priority);
 292         if (status == B_BAD_THREAD_ID)
 293                 return ESRCH;
 294         return status;
 295 }
 296
 297
 298 // #pragma mark - Haiku thread API bridge
 299
 300
 301 thread_id
 302 get_pthread_thread_id(pthread_t thread)
 303 {
 304         return thread->id;
 305 }