Mercurial > nand-ecoscentric
annotate packages/kernel/current/src/common/thread.cxx @ 3403:8c8767bb9a62 default tip
devs/nand/micron_mt29: Remove defunct references (in comments) to mt29f2g08_oob_ecc.
| author | Ross Younger <wry@ecoscentric.com> |
|---|---|
| date | Sun, 18 Jan 2015 17:59:01 +1300 |
| parents | 041821fb5427 |
| children |
| rev | line source |
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| 0 | 1 //========================================================================== |
| 2 // | |
| 2 | 3 // common/thread.cxx |
| 0 | 4 // |
| 2 | 5 // Thread class implementations |
| 0 | 6 // |
| 7 //========================================================================== | |
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8 // ####ECOSGPLCOPYRIGHTBEGIN#### |
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9 // ------------------------------------------- |
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10 // This file is part of eCos, the Embedded Configurable Operating System. |
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11 // Copyright (C) 1998, 1999, 2000, 2001, 2002, 2009 Free Software Foundation, Inc. |
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12 // |
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13 // eCos is free software; you can redistribute it and/or modify it under |
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14 // the terms of the GNU General Public License as published by the Free |
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15 // Software Foundation; either version 2 or (at your option) any later |
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16 // version. |
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17 // |
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18 // eCos is distributed in the hope that it will be useful, but WITHOUT |
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19 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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20 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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21 // for more details. |
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22 // |
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23 // You should have received a copy of the GNU General Public License |
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24 // along with eCos; if not, write to the Free Software Foundation, Inc., |
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25 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
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208
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26 // |
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27 // As a special exception, if other files instantiate templates or use |
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28 // macros or inline functions from this file, or you compile this file |
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29 // and link it with other works to produce a work based on this file, |
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30 // this file does not by itself cause the resulting work to be covered by |
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31 // the GNU General Public License. However the source code for this file |
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32 // must still be made available in accordance with section (3) of the GNU |
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33 // General Public License v2. |
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34 // |
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35 // This exception does not invalidate any other reasons why a work based |
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36 // on this file might be covered by the GNU General Public License. |
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37 // ------------------------------------------- |
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38 // ####ECOSGPLCOPYRIGHTEND#### |
| 0 | 39 //========================================================================== |
| 40 //#####DESCRIPTIONBEGIN#### | |
| 41 // | |
| 2 | 42 // Author(s): nickg |
| 43 // Contributors: nickg | |
| 44 // Date: 1997-09-15 | |
| 45 // Purpose: Thread class implementation | |
| 46 // Description: This file contains the definitions of the thread class | |
| 0 | 47 // member functions that are common to all thread implementations. |
| 48 // | |
| 49 //####DESCRIPTIONEND#### | |
| 50 // | |
| 51 //========================================================================== | |
| 52 | |
| 53 #include <pkgconf/kernel.h> // kernel configuration file | |
| 54 | |
| 2 | 55 #include <cyg/hal/hal_arch.h> // HAL_REORDER_BARRIER & |
| 56 // CYGNUM_HAL_STACK_SIZE_TYPICAL | |
| 57 | |
| 0 | 58 #include <cyg/kernel/ktypes.h> // base kernel types |
| 59 #include <cyg/infra/cyg_trac.h> // tracing macros | |
| 60 #include <cyg/infra/cyg_ass.h> // assertion macros | |
| 61 #include <cyg/kernel/instrmnt.h> // instrumentation | |
| 62 | |
| 63 #include <cyg/kernel/thread.hxx> // our header | |
| 64 | |
| 65 #include <cyg/kernel/intr.hxx> // Interrupt support | |
| 66 | |
| 67 #include <cyg/kernel/thread.inl> // thread inlines | |
| 68 #include <cyg/kernel/sched.inl> // scheduler inlines | |
| 69 #include <cyg/kernel/clock.inl> // clock inlines | |
| 70 | |
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71 #ifdef CYGDBG_KERNEL_THREADS_STACK_MEASUREMENT_VERBOSE_EXIT |
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72 #include <cyg/infra/diag.h> |
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73 #endif |
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74 |
| 0 | 75 // ========================================================================= |
| 76 // Cyg_HardwareThread members | |
| 77 | |
| 78 // ------------------------------------------------------------------------- | |
| 79 // Thread entry point. | |
| 80 // This is inserted as the PC value in all initial thread contexts. | |
| 81 // It does some housekeeping and then calls the real entry point. | |
| 82 | |
| 83 void | |
| 84 Cyg_HardwareThread::thread_entry( Cyg_Thread *thread ) | |
| 85 { | |
| 86 CYG_REPORT_FUNCTION(); | |
| 87 | |
| 2117 | 88 // Call the scheduler to do any housekeeping |
| 89 Cyg_Scheduler::scheduler.thread_entry( thread ); | |
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90 |
| 0 | 91 // Call entry point in a loop. |
| 92 for(;;) | |
| 93 { | |
| 94 thread->entry_point(thread->entry_data); | |
| 95 thread->exit(); | |
| 96 } | |
| 97 } | |
| 98 | |
| 99 // ========================================================================= | |
| 100 // Cyg_Thread members | |
| 101 | |
| 102 // ------------------------------------------------------------------------- | |
| 103 // Statics and thread list functions | |
| 104 | |
| 105 #ifdef CYGVAR_KERNEL_THREADS_LIST | |
| 106 | |
| 107 // List of all extant threads | |
| 108 Cyg_Thread *Cyg_Thread::thread_list = 0; | |
| 109 | |
| 110 inline void | |
| 111 Cyg_Thread::add_to_list( void ) | |
| 112 { | |
| 113 // Add thread to housekeeping list | |
| 114 Cyg_Scheduler::lock(); | |
| 115 | |
| 116 if( thread_list == 0 ) | |
| 117 list_next = this; | |
| 118 else { | |
| 119 Cyg_Thread *prev = thread_list; | |
| 120 do { | |
| 121 if ( this == prev ) | |
| 122 break; // found it already! | |
| 123 prev = prev->list_next; | |
| 124 } while ( prev != thread_list ); | |
| 125 if ( this != prev ) { | |
| 126 // insert it in the list: | |
| 127 list_next = thread_list->list_next; | |
| 128 thread_list->list_next = this; | |
| 129 } | |
| 130 } | |
| 131 thread_list = this; | |
| 132 | |
| 133 Cyg_Scheduler::unlock(); | |
| 134 } | |
| 135 | |
| 136 inline void | |
| 137 Cyg_Thread::remove_from_list( void ) | |
| 138 { | |
| 139 // remove thread from housekeeping list | |
| 140 Cyg_Scheduler::lock(); | |
| 141 | |
| 142 Cyg_Thread *prev = thread_list; | |
| 143 | |
| 144 do { | |
| 145 if( prev->list_next == this ) { | |
| 146 prev->list_next = list_next; | |
| 147 if( thread_list == this ) | |
| 148 thread_list = list_next; | |
| 149 break; | |
| 150 } | |
| 151 prev = prev->list_next; | |
| 152 } while ( prev != thread_list ); | |
| 153 | |
| 154 Cyg_Scheduler::unlock(); | |
| 155 } | |
| 156 | |
| 157 #endif | |
| 158 | |
| 159 static cyg_uint16 next_unique_id = 1; | |
| 160 | |
| 161 // ------------------------------------------------------------------------- | |
| 162 // Magic new operator to allow the thread constructor to be | |
| 163 // recalled. | |
| 164 | |
| 165 inline void * | |
| 166 operator new(size_t size, Cyg_Thread *ptr) | |
| 167 { return (void *)ptr; }; | |
| 168 | |
| 169 // Constructor | |
| 170 | |
| 171 Cyg_Thread::Cyg_Thread( | |
| 172 CYG_ADDRWORD sched_info, // Scheduling parameter(s) | |
| 173 cyg_thread_entry *entry, // entry point function | |
| 174 CYG_ADDRWORD entry_data, // entry data | |
| 175 char *name_arg, // thread name cookie | |
| 176 CYG_ADDRESS stack_base, // stack base, NULL = allocate | |
| 177 cyg_ucount32 stack_size // stack size, 0 = use default | |
| 178 ) | |
| 179 : Cyg_HardwareThread(entry, entry_data, stack_size, stack_base), | |
| 180 Cyg_SchedThread(this, sched_info) | |
| 181 #ifdef CYGFUN_KERNEL_THREADS_TIMER | |
| 182 ,timer(this) | |
| 183 #endif | |
| 184 { | |
| 185 CYG_REPORT_FUNCTION(); | |
| 186 | |
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187 CYG_INSTRUMENT_THREAD(CREATE,this,0); |
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188 |
| 0 | 189 // Start the thread in suspended state. |
| 190 state = SUSPENDED; | |
| 191 suspend_count = 1; | |
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192 wakeup_count = 0; |
| 0 | 193 |
| 194 // Initialize sleep_reason which is used by kill, release | |
| 195 sleep_reason = NONE; | |
| 196 wake_reason = NONE; | |
| 197 | |
| 198 // Assign a 16 bit id to the thread. | |
| 199 unique_id = next_unique_id++; | |
| 200 | |
| 201 #ifdef CYGVAR_KERNEL_THREADS_DATA | |
| 202 // Zero all per-thread data entries. | |
| 203 for( int i = 0; i < CYGNUM_KERNEL_THREADS_DATA_MAX; i++ ) | |
| 204 thread_data[i] = 0; | |
| 205 #endif | |
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206 #ifdef CYGSEM_KERNEL_THREADS_DESTRUCTORS_PER_THREAD |
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207 for (int j=0; j<CYGNUM_KERNEL_THREADS_DESTRUCTORS; j++) { |
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208 destructors[j].fn = NULL; |
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209 } |
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210 #endif |
| 0 | 211 #ifdef CYGVAR_KERNEL_THREADS_NAME |
| 212 name = name_arg; | |
| 213 #endif | |
| 214 #ifdef CYGVAR_KERNEL_THREADS_LIST | |
| 215 // Add thread to housekeeping list | |
| 216 add_to_list(); | |
| 217 #endif | |
| 218 | |
| 219 Cyg_Scheduler::scheduler.register_thread(this); | |
| 220 | |
| 221 init_context(this); | |
| 222 | |
| 223 CYG_REPORT_RETURN(); | |
| 224 } | |
| 225 | |
| 226 | |
| 227 // ------------------------------------------------------------------------- | |
| 228 // Re-initialize this thread. | |
| 229 // We do this by re-invoking the constructor with the original | |
| 230 // arguments, which are still available in the object. | |
| 231 | |
| 232 void | |
| 233 Cyg_Thread::reinitialize() | |
| 234 { | |
| 235 CYG_REPORT_FUNCTION(); | |
| 236 | |
| 237 CYG_ASSERTCLASS( this, "Bad thread"); | |
| 238 CYG_ASSERT( this != Cyg_Scheduler::get_current_thread(), | |
| 239 "Attempt to reinitialize current thread"); | |
| 240 CYG_ASSERT( get_current_queue() == NULL , "Thread is still on a queue"); | |
| 241 | |
| 242 #ifdef CYGFUN_KERNEL_THREADS_TIMER | |
| 243 // Clear the timeout. It is irrelevant whether there was | |
| 244 // actually a timeout pending. | |
| 245 timer.disable(); | |
| 246 #endif | |
| 247 | |
| 248 // Ensure the scheduler has let go of us. | |
| 249 Cyg_Scheduler::scheduler.deregister_thread(this); | |
| 250 | |
| 251 cyg_priority pri = get_priority(); | |
| 252 #ifdef CYGVAR_KERNEL_THREADS_NAME | |
| 253 char * name_arg = name; | |
| 254 #else | |
| 255 char * name_arg = NULL; | |
| 256 #endif | |
| 257 | |
| 258 new(this) Cyg_Thread( pri, | |
| 259 entry_point, entry_data, | |
| 260 name_arg, | |
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261 get_stack_base(), get_stack_size() ); |
| 0 | 262 // the constructor re-registers the thread with the scheduler. |
| 263 | |
| 264 CYG_ASSERTCLASS( this, "Thread corrupted by reinitialize"); | |
| 265 | |
| 266 CYG_REPORT_RETURN(); | |
| 267 } | |
| 268 | |
| 269 // ------------------------------------------------------------------------- | |
| 270 // Destructor. | |
| 271 | |
| 272 Cyg_Thread::~Cyg_Thread() | |
| 273 { | |
| 274 CYG_REPORT_FUNCTION(); | |
| 275 | |
| 276 Cyg_Scheduler::scheduler.deregister_thread(this); | |
| 277 | |
| 278 #ifdef CYGVAR_KERNEL_THREADS_LIST | |
| 279 // Remove thread from housekeeping list. | |
| 280 remove_from_list(); | |
| 281 #endif | |
| 282 | |
| 460 | 283 // Zero the unique_id to render this thread inconsistent. |
| 284 unique_id = 0; | |
| 285 | |
| 0 | 286 CYG_REPORT_RETURN(); |
| 287 } | |
| 288 | |
| 289 // ------------------------------------------------------------------------- | |
| 290 // Thread consistency checker. | |
| 291 | |
| 292 #ifdef CYGDBG_USE_ASSERTS | |
| 293 | |
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294 cyg_bool |
| 2 | 295 Cyg_Thread::check_this( cyg_assert_class_zeal zeal) const |
| 0 | 296 { |
| 297 // CYG_REPORT_FUNCTION(); | |
| 298 | |
| 299 // check that we have a non-NULL pointer first | |
| 300 if( this == NULL ) return false; | |
| 301 | |
| 302 switch( zeal ) | |
| 303 { | |
| 304 case cyg_system_test: | |
| 305 case cyg_extreme: | |
| 306 case cyg_thorough: | |
| 307 if( (state & SUSPENDED) && (suspend_count == 0) ) return false; | |
| 308 case cyg_quick: | |
| 2 | 309 // Check that the stackpointer is within its limits. |
| 310 // Note: This does not check the current stackpointer value | |
| 311 // of the executing thread. | |
| 312 if( (stack_ptr > (stack_base + stack_size)) || | |
| 313 (stack_ptr < stack_base) ) return false; | |
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314 #ifdef CYGFUN_KERNEL_THREADS_STACK_LIMIT |
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315 if( stack_ptr < stack_limit ) return false; |
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316 #endif |
| 0 | 317 case cyg_trivial: |
| 318 case cyg_none: | |
| 319 default: | |
| 320 break; | |
| 321 }; | |
| 322 | |
| 323 return true; | |
| 324 } | |
| 325 | |
| 326 #endif | |
| 327 | |
| 328 // ------------------------------------------------------------------------- | |
| 329 // Put the thread to sleep. | |
| 330 // This can only be called by the current thread on itself, hence | |
| 331 // it is a static function. | |
| 332 | |
| 333 void | |
| 334 Cyg_Thread::sleep() | |
| 335 { | |
| 336 CYG_REPORT_FUNCTION(); | |
| 337 | |
| 338 Cyg_Thread *current = Cyg_Scheduler::get_current_thread(); | |
| 339 | |
| 340 CYG_ASSERTCLASS( current, "Bad current thread" ); | |
| 341 | |
| 342 CYG_INSTRUMENT_THREAD(SLEEP,current,0); | |
| 343 | |
| 344 // Prevent preemption | |
| 345 Cyg_Scheduler::lock(); | |
| 346 | |
| 347 // If running, remove from run qs | |
| 348 if ( current->state == RUNNING ) | |
| 349 Cyg_Scheduler::scheduler.rem_thread(current); | |
| 350 | |
| 351 // Set the state | |
| 352 current->state |= SLEEPING; | |
| 353 | |
| 354 // Unlock the scheduler and switch threads | |
| 355 Cyg_Scheduler::unlock(); | |
| 356 | |
| 357 CYG_REPORT_RETURN(); | |
| 358 } | |
| 359 | |
| 360 // ------------------------------------------------------------------------- | |
| 361 // Awaken the thread from sleep. | |
| 362 | |
| 363 void | |
| 364 Cyg_Thread::wake() | |
| 365 { | |
| 366 CYG_REPORT_FUNCTION(); | |
| 367 | |
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368 CYG_INSTRUMENT_THREAD(WAKE,this,Cyg_Scheduler::get_current_thread()); |
| 0 | 369 |
| 370 // Prevent preemption | |
| 371 Cyg_Scheduler::lock(); | |
| 372 | |
| 373 if( 0 != (state & SLEEPSET) ) | |
| 374 { | |
| 375 // Set the state | |
| 376 state &= ~SLEEPSET; | |
| 377 | |
| 378 // remove from any queue we were on | |
| 379 remove(); | |
| 380 | |
| 381 // If the thread is now runnable, return it to run queue | |
| 382 if( state == RUNNING ) | |
| 383 Cyg_Scheduler::scheduler.add_thread(this); | |
| 384 | |
| 385 } | |
| 386 | |
| 387 // Unlock the scheduler and maybe switch threads | |
| 388 Cyg_Scheduler::unlock(); | |
| 389 | |
| 390 CYG_REPORT_RETURN(); | |
| 391 } | |
| 392 | |
| 393 // ------------------------------------------------------------------------- | |
| 394 // Put the thread to sleep, with wakeup count. | |
| 395 // This can only be called by the current thread on itself, hence | |
| 396 // it is a static function. | |
| 397 | |
| 398 void | |
| 399 Cyg_Thread::counted_sleep() | |
| 400 { | |
| 401 CYG_REPORT_FUNCTION(); | |
| 402 | |
| 403 Cyg_Thread *current = Cyg_Scheduler::get_current_thread(); | |
| 404 | |
| 405 CYG_ASSERTCLASS( current, "Bad current thread" ); | |
| 406 | |
| 407 CYG_INSTRUMENT_THREAD(SLEEP,current,0); | |
| 408 | |
| 409 // Prevent preemption | |
| 410 Cyg_Scheduler::lock(); | |
| 411 | |
| 412 if ( 0 == current->wakeup_count ) { | |
| 413 set_sleep_reason( Cyg_Thread::WAIT ); | |
| 414 current->sleep(); // prepare to sleep | |
| 415 current->state |= COUNTSLEEP; // Set the state | |
| 416 } | |
| 417 else | |
| 418 // there is a queued wakeup, do not sleep | |
| 419 current->wakeup_count--; | |
| 420 | |
| 421 // Unlock the scheduler and switch threads | |
| 422 Cyg_Scheduler::unlock(); | |
| 423 | |
| 424 // and deal with anything we must do when we return | |
| 425 switch( current->wake_reason ) { | |
| 426 case DESTRUCT: | |
| 427 case EXIT: | |
| 428 current->exit(); | |
| 429 break; | |
| 430 | |
| 431 default: | |
| 432 break; | |
| 433 } | |
| 434 | |
| 435 CYG_REPORT_RETURN(); | |
| 436 } | |
| 437 | |
| 438 // ------------------------------------------------------------------------- | |
| 439 // Put the thread to sleep for a delay, with wakeup count. | |
| 440 // This can only be called by the current thread on itself, hence | |
| 441 // it is a static function. | |
| 442 | |
| 443 #ifdef CYGFUN_KERNEL_THREADS_TIMER | |
| 444 void | |
| 445 Cyg_Thread::counted_sleep( cyg_tick_count delay ) | |
| 446 { | |
| 447 CYG_REPORT_FUNCTION(); | |
| 448 | |
| 449 Cyg_Thread *current = Cyg_Scheduler::get_current_thread(); | |
| 450 | |
| 451 CYG_ASSERTCLASS( current, "Bad current thread" ); | |
| 452 | |
| 453 CYG_INSTRUMENT_THREAD(SLEEP,current,0); | |
| 454 | |
| 455 // Prevent preemption | |
| 456 Cyg_Scheduler::lock(); | |
| 457 | |
| 458 if ( 0 == current->wakeup_count ) { | |
| 459 | |
| 460 // Set the timer (once outside any waiting loop.) | |
| 461 set_timer( Cyg_Clock::real_time_clock->current_value()+delay, | |
| 462 Cyg_Thread::TIMEOUT ); | |
| 463 | |
| 464 // If the timeout is in the past, the wake reason will have been | |
| 465 // set to something other than NONE already. | |
| 466 | |
| 467 if( current->get_wake_reason() == Cyg_Thread::NONE ) | |
| 468 { | |
| 469 set_sleep_reason( Cyg_Thread::TIMEOUT ); | |
| 470 current->sleep(); // prepare to sleep | |
| 471 current->state |= COUNTSLEEP; // Set the state | |
| 472 | |
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473 Cyg_Scheduler::reschedule(); |
| 0 | 474 |
| 475 // clear the timer; if it actually fired, no worries. | |
| 476 clear_timer(); | |
| 477 } | |
| 478 } | |
| 479 else | |
| 480 // there is a queued wakeup, do not sleep | |
| 481 current->wakeup_count--; | |
| 482 | |
| 483 // Unlock the scheduler and switch threads | |
| 484 Cyg_Scheduler::unlock(); | |
| 485 | |
| 486 // and deal with anything we must do when we return | |
| 487 switch( current->wake_reason ) { | |
| 488 case DESTRUCT: | |
| 489 case EXIT: | |
| 490 current->exit(); | |
| 491 break; | |
| 492 | |
| 493 default: | |
| 494 break; | |
| 495 } | |
| 496 | |
| 497 CYG_REPORT_RETURN(); | |
| 498 } | |
| 499 #endif | |
| 500 | |
| 501 // ------------------------------------------------------------------------- | |
| 502 // Awaken the thread from sleep. | |
| 503 | |
| 504 void | |
| 505 Cyg_Thread::counted_wake() | |
| 506 { | |
| 507 CYG_REPORT_FUNCTION(); | |
| 508 | |
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509 CYG_INSTRUMENT_THREAD(WAKE,this,Cyg_Scheduler::get_current_thread()); |
| 0 | 510 |
| 511 // Prevent preemption | |
| 512 Cyg_Scheduler::lock(); | |
| 513 | |
| 514 if ( 0 == (state & COUNTSLEEP) ) // already awake, or waiting: | |
| 515 wakeup_count++; // not in a counted sleep anyway. | |
| 516 else { | |
| 517 sleep_reason = NONE; | |
| 518 wake_reason = DONE; | |
| 519 wake(); // and awaken the thread | |
| 520 } | |
| 521 | |
| 522 #ifdef CYGNUM_KERNEL_MAX_COUNTED_WAKE_COUNT_ASSERT | |
| 523 CYG_ASSERT( CYGNUM_KERNEL_MAX_COUNTED_WAKE_COUNT_ASSERT > wakeup_count, | |
| 524 "wakeup_count overflow" ); | |
| 525 #endif | |
| 526 | |
| 527 // Unlock the scheduler and maybe switch threads | |
| 528 Cyg_Scheduler::unlock(); | |
| 529 | |
| 530 CYG_REPORT_RETURN(); | |
| 531 } | |
| 532 | |
| 533 // ------------------------------------------------------------------------- | |
| 534 // Cancel wakeups for this thread and return how many were pending | |
| 535 cyg_uint32 | |
| 536 Cyg_Thread::cancel_counted_wake() | |
| 537 { | |
| 538 CYG_REPORT_FUNCTION(); | |
| 539 | |
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540 CYG_INSTRUMENT_THREAD(WAKE,this,Cyg_Scheduler::get_current_thread()); |
| 0 | 541 |
| 542 // Prevent preemption | |
| 543 Cyg_Scheduler::lock(); | |
| 544 | |
| 545 cyg_uint32 result = wakeup_count; | |
| 546 wakeup_count = 0; | |
| 547 | |
| 548 // Unlock the scheduler | |
| 549 Cyg_Scheduler::unlock(); | |
| 550 | |
| 551 CYG_REPORT_RETVAL( result ); | |
| 552 return result; | |
| 553 } | |
| 554 | |
| 555 // ------------------------------------------------------------------------- | |
| 556 // Suspend thread. Increment suspend count and deschedule thread | |
| 557 // if still running. | |
| 558 | |
| 559 void | |
| 560 Cyg_Thread::suspend() | |
| 561 { | |
| 562 CYG_REPORT_FUNCTION(); | |
| 563 | |
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564 CYG_INSTRUMENT_THREAD(SUSPEND,this,Cyg_Scheduler::get_current_thread()); |
| 0 | 565 |
| 566 // Prevent preemption | |
| 567 Cyg_Scheduler::lock(); | |
| 568 | |
| 569 suspend_count++; | |
| 570 | |
| 571 #ifdef CYGNUM_KERNEL_MAX_SUSPEND_COUNT_ASSERT | |
| 572 CYG_ASSERT( CYGNUM_KERNEL_MAX_SUSPEND_COUNT_ASSERT > suspend_count, | |
| 573 "suspend_count overflow" ); | |
| 574 #endif | |
| 575 | |
| 576 // If running, remove from run qs | |
| 577 if( state == RUNNING ) | |
| 578 Cyg_Scheduler::scheduler.rem_thread(this); | |
| 579 | |
| 580 // Set the state | |
| 581 state |= SUSPENDED; | |
| 582 | |
| 583 // Unlock the scheduler and maybe switch threads | |
| 584 Cyg_Scheduler::unlock(); | |
| 585 | |
| 586 CYG_REPORT_RETURN(); | |
| 587 } | |
| 588 | |
| 589 // ------------------------------------------------------------------------- | |
| 590 // Resume thread. Decrement suspend count and reschedule if it | |
| 591 // is zero. | |
| 592 | |
| 593 void | |
| 594 Cyg_Thread::resume() | |
| 595 { | |
| 596 CYG_REPORT_FUNCTION(); | |
| 597 | |
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598 CYG_INSTRUMENT_THREAD(RESUME,this,Cyg_Scheduler::get_current_thread()); |
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599 |
| 0 | 600 // Prevent preemption |
| 601 Cyg_Scheduler::lock(); | |
| 602 | |
| 603 // If we are about to zero the count, clear the state bit and | |
| 604 // reschedule the thread if possible. | |
| 605 | |
| 606 if( suspend_count == 1 ) | |
| 607 { | |
| 608 suspend_count = 0; | |
| 609 | |
| 610 CYG_ASSERT( (state & SUSPENDED) != 0, "SUSPENDED bit not set" ); | |
| 611 | |
| 612 // Set the state | |
| 613 state &= ~SUSPENDED; | |
| 614 | |
| 615 // Return thread to scheduler if runnable | |
| 616 if( state == RUNNING ) | |
| 617 Cyg_Scheduler::scheduler.add_thread(this); | |
| 618 } | |
| 619 else | |
| 620 if( suspend_count > 0 ) | |
| 621 suspend_count--; | |
| 622 // else ignore attempt to resume | |
| 623 | |
| 624 // Unlock the scheduler and maybe switch threads | |
| 625 Cyg_Scheduler::unlock(); | |
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626 |
| 0 | 627 CYG_REPORT_RETURN(); |
| 628 } | |
| 629 | |
| 630 // ------------------------------------------------------------------------- | |
| 631 // Forced Resume thread. Zero suspend count and reschedule... | |
| 632 | |
| 633 void | |
| 634 Cyg_Thread::force_resume() | |
| 635 { | |
| 636 CYG_REPORT_FUNCTION(); | |
| 637 | |
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638 CYG_INSTRUMENT_THREAD(RESUME,this,Cyg_Scheduler::get_current_thread()); |
| 0 | 639 |
| 640 // Prevent preemption | |
| 641 Cyg_Scheduler::lock(); | |
| 642 | |
| 643 // If we are about to zero the count, clear the state bit and | |
| 644 // reschedule the thread if possible. | |
| 645 | |
| 646 if ( 0 < suspend_count ) { | |
| 647 suspend_count = 0; | |
| 648 | |
| 649 CYG_ASSERT( (state & SUSPENDED) != 0, "SUSPENDED bit not set" ); | |
| 650 | |
| 651 // Set the state | |
| 652 state &= ~SUSPENDED; | |
| 653 | |
| 654 // Return thread to scheduler if runnable | |
| 655 if( state == RUNNING ) | |
| 656 Cyg_Scheduler::scheduler.add_thread(this); | |
| 657 } | |
| 658 | |
| 659 // Unlock the scheduler and maybe switch threads | |
| 660 Cyg_Scheduler::unlock(); | |
| 661 CYG_REPORT_RETURN(); | |
| 662 } | |
| 663 | |
| 664 // ------------------------------------------------------------------------- | |
| 665 // Force thread to wake up from a sleep with a wake_reason of | |
| 666 // BREAK. It is the responsibility of the woken thread to detect | |
| 667 // the release() and do the right thing. | |
| 668 | |
| 669 void | |
| 670 Cyg_Thread::release() | |
| 671 { | |
| 672 CYG_REPORT_FUNCTION(); | |
| 673 // Prevent preemption | |
| 674 Cyg_Scheduler::lock(); | |
| 675 | |
| 676 // If the thread is in any of the sleep states, set the | |
| 677 // wake reason and wake it up. | |
| 678 | |
| 679 switch( sleep_reason ) | |
| 680 { | |
| 681 | |
| 682 case NONE: | |
| 683 // The thread is not sleeping for any reason, do nothing. | |
| 684 // drop through... | |
| 685 | |
| 686 case DESTRUCT: | |
| 687 case BREAK: | |
| 688 case EXIT: | |
| 689 case DONE: | |
| 690 // Do nothing in any of these cases. They are here to | |
| 691 // keep the compiler happy. | |
| 692 | |
| 693 Cyg_Scheduler::unlock(); | |
| 694 CYG_REPORT_RETURN(); | |
| 695 return; | |
| 696 | |
| 697 case WAIT: | |
| 698 // The thread was waiting for some sync object to do | |
| 699 // something. | |
| 700 // drop through... | |
| 701 | |
| 702 case TIMEOUT: | |
| 703 // The thread was waiting on a sync object with a timeout. | |
| 704 // drop through... | |
| 705 | |
| 706 case DELAY: | |
| 707 // The thread was simply delaying, unless it has been | |
| 708 // woken up for some other reason, wake it now. | |
| 709 sleep_reason = NONE; | |
| 710 wake_reason = BREAK; | |
| 711 break; | |
| 712 } | |
| 713 | |
| 714 wake(); | |
| 715 | |
| 716 // Allow preemption | |
| 717 Cyg_Scheduler::unlock(); | |
| 718 | |
| 719 CYG_REPORT_RETURN(); | |
| 720 } | |
| 721 | |
| 722 // ------------------------------------------------------------------------- | |
| 723 // Exit thread. This puts the thread into EXITED state. | |
| 724 | |
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725 #ifdef CYGPKG_KERNEL_THREADS_DESTRUCTORS |
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726 #ifndef CYGSEM_KERNEL_THREADS_DESTRUCTORS_PER_THREAD |
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727 Cyg_Thread::Cyg_Destructor_Entry |
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728 Cyg_Thread::destructors[ CYGNUM_KERNEL_THREADS_DESTRUCTORS ]; |
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729 #endif |
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730 #endif |
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731 |
| 0 | 732 void |
| 733 Cyg_Thread::exit() | |
| 734 { | |
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735 CYG_REPORT_FUNCTION(); |
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736 |
| 0 | 737 // The thread should never return from this function. |
| 738 | |
| 739 Cyg_Thread *self = Cyg_Thread::self(); | |
| 740 | |
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741 #ifdef CYGPKG_KERNEL_THREADS_DESTRUCTORS |
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742 cyg_ucount16 i; |
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743 for (i=0; i<CYGNUM_KERNEL_THREADS_DESTRUCTORS; i++) { |
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744 if (NULL != self->destructors[i].fn) { |
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745 destructor_fn fn = self->destructors[i].fn; |
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746 CYG_ADDRWORD data = self->destructors[i].data; |
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747 fn(data); |
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748 } |
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749 } |
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750 #endif |
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751 #ifdef CYGDBG_KERNEL_THREADS_STACK_MEASUREMENT_VERBOSE_EXIT |
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752 diag_printf( "Stack usage for thread %08x: %d\n", self, |
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753 self->measure_stack_usage() ); |
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754 #endif |
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755 |
| 0 | 756 Cyg_Scheduler::lock(); |
| 757 | |
| 758 // clear the timer; if there was none, no worries. | |
| 759 clear_timer(); | |
| 760 | |
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761 // It is possible that we have already been killed by another |
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762 // thread, in which case we do not want to try and take ourself |
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763 // out of the scheduler again. |
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764 if( self->state != EXITED ) |
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765 { |
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766 self->state = EXITED; |
| 0 | 767 |
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768 Cyg_Scheduler::scheduler.rem_thread(self); |
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769 } |
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770 |
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771 Cyg_Scheduler::reschedule(); |
| 0 | 772 } |
| 773 | |
| 774 // ------------------------------------------------------------------------- | |
| 775 // Kill thread. Force the thread into EXITED state externally, or | |
| 776 // make it wake up and call exit(). | |
| 777 | |
| 778 void | |
| 779 Cyg_Thread::kill() | |
| 780 { | |
| 781 CYG_REPORT_FUNCTION(); | |
| 782 // If this is called by the current thread on itself, | |
| 783 // just call exit(), which is what he should have done | |
| 784 // in the first place. | |
| 785 if( this == Cyg_Scheduler::get_current_thread() ) | |
| 786 exit(); | |
| 787 | |
| 788 // Prevent preemption | |
| 789 Cyg_Scheduler::lock(); | |
| 790 | |
| 791 // We are killing someone else. Find out what state he is | |
| 792 // in and force him to wakeup and call exit(). | |
| 793 | |
| 794 force_resume(); // this is necessary for when | |
| 795 // he is asleep AND suspended. | |
| 796 #ifdef CYGFUN_KERNEL_THREADS_TIMER | |
| 797 timer.disable(); // and make sure the timer | |
| 798 // does not persist. | |
| 799 #endif | |
| 800 | |
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801 if ( EXIT != wake_reason ) switch( sleep_reason ) { |
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802 // Only do any of this if the thread is not in pending death already: |
| 0 | 803 |
| 804 case NONE: | |
| 805 // The thread is not sleeping for any reason, it must be | |
| 806 // on a run queue. | |
| 807 // We can safely deschedule and set its state. | |
| 808 if( state == RUNNING ) Cyg_Scheduler::scheduler.rem_thread(this); | |
| 809 state = EXITED; | |
| 810 break; | |
| 811 | |
| 812 case DESTRUCT: | |
| 813 case BREAK: | |
| 814 case EXIT: | |
| 815 case DONE: | |
| 816 // Do nothing in any of these cases. They are here to | |
| 817 // keep the compiler happy. | |
| 818 | |
| 819 Cyg_Scheduler::unlock(); | |
| 820 CYG_REPORT_RETURN(); | |
| 821 return; | |
| 822 | |
| 823 case WAIT: | |
| 824 // The thread was waiting for some sync object to do | |
| 825 // something. | |
| 826 // drop through... | |
| 827 | |
| 828 case TIMEOUT: | |
| 829 // The thread was waiting on a sync object with a timeout. | |
| 830 // drop through... | |
| 831 | |
| 832 case DELAY: | |
| 833 // The thread was simply delaying, unless it has been | |
| 834 // woken up for some other reason, wake it now. | |
| 835 sleep_reason = NONE; | |
| 836 wake_reason = EXIT; | |
| 837 break; | |
| 838 } | |
| 839 | |
| 840 wake(); | |
| 841 | |
| 842 // Allow preemption | |
| 843 Cyg_Scheduler::unlock(); | |
| 844 CYG_REPORT_RETURN(); | |
| 845 } | |
| 846 | |
| 847 // ------------------------------------------------------------------------- | |
| 848 // Set thread priority | |
| 849 | |
| 850 #ifdef CYGIMP_THREAD_PRIORITY | |
| 851 | |
| 852 void | |
| 853 Cyg_Thread::set_priority( cyg_priority new_priority ) | |
| 854 { | |
| 855 CYG_REPORT_FUNCTION(); | |
| 856 | |
| 857 // CYG_ASSERT( new_priority >= CYG_THREAD_MAX_PRIORITY, "Priority out of range"); | |
| 858 // CYG_ASSERT( new_priority <= CYG_THREAD_MIN_PRIORITY, "Priority out of range"); | |
| 859 | |
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860 CYG_INSTRUMENT_THREAD(PRIORITY,this,new_priority); |
| 0 | 861 |
| 862 // Prevent preemption | |
| 863 Cyg_Scheduler::lock(); | |
| 864 | |
| 865 Cyg_ThreadQueue *queue = NULL; | |
| 866 | |
| 867 // If running, remove from run qs | |
| 868 if( state == RUNNING ) | |
| 869 Cyg_Scheduler::scheduler.rem_thread(this); | |
| 870 else if( state & SLEEPING ) | |
| 871 { | |
| 872 // Remove thread from current queue. | |
| 873 queue = get_current_queue(); | |
| 874 // if indeed we are on a queue | |
| 875 if ( NULL != queue ) { | |
| 876 CYG_CHECK_DATA_PTR(queue, "Bad queue pointer"); | |
| 877 remove(); | |
| 878 } | |
| 879 } | |
| 880 | |
| 881 Cyg_Scheduler::scheduler.deregister_thread(this); | |
| 882 | |
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883 #if CYGINT_KERNEL_SCHEDULER_UNIQUE_PRIORITIES |
| 0 | 884 |
| 885 // Check that there are no other threads at this priority. | |
| 886 // If so, leave is as it is. | |
| 887 | |
| 888 CYG_ASSERT( Cyg_Scheduler::scheduler.unique(new_priority), "Priority not unique"); | |
| 889 | |
| 890 if( Cyg_Scheduler::scheduler.unique(new_priority) ) | |
| 891 priority = new_priority; | |
| 892 | |
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893 #else // !CYGINT_KERNEL_SCHEDULER_UNIQUE_PRIORITIES |
| 0 | 894 |
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895 #ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_SIMPLE |
| 0 | 896 |
| 897 // When we have priority inheritance, we must update the original | |
| 898 // priority and not the inherited one. If the new priority is | |
| 899 // better than the current inherited one, then use that | |
| 900 // immediately. We remain in inherited state to avoid problems | |
| 901 // with multiple mutex inheritances. | |
| 902 | |
| 903 if( priority_inherited ) | |
| 904 { | |
| 905 original_priority = new_priority; | |
| 906 if( priority > new_priority ) priority = new_priority; | |
| 907 } | |
| 908 else priority = new_priority; | |
| 909 | |
| 910 #else | |
| 911 | |
| 912 priority = new_priority; | |
| 913 | |
| 914 #endif | |
| 915 | |
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916 #endif // CYGINT_KERNEL_SCHEDULER_UNIQUE_PRIORITIES |
| 0 | 917 |
| 918 Cyg_Scheduler::scheduler.register_thread(this); | |
| 919 | |
| 920 // Return thread to scheduler if runnable | |
| 921 if( state == RUNNING ) | |
| 922 Cyg_Scheduler::scheduler.add_thread(this); | |
| 923 else if ( state & SLEEPING ) | |
| 924 { | |
| 925 // return to current queue | |
| 926 // if indeed we are on a queue | |
| 927 if ( NULL != queue ) { | |
| 928 CYG_CHECK_DATA_PTR(queue, "Bad queue pointer"); | |
| 929 queue->enqueue(this); | |
| 930 } | |
| 931 } | |
| 932 | |
| 933 // If the current thread is being reprioritized, set the | |
| 934 // reschedule flag to ensure that it gets rescheduled if | |
| 935 // necessary. (Strictly we only need to do this if the new | |
| 936 // priority is less than that of some other runnable thread, in | |
| 937 // practice checking that is as expensive as what the scheduler | |
| 938 // will do anyway). | |
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939 // If it is not the current thread then we need to see whether |
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940 // it is more worthy of execution than any current thread and |
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941 // rescheduled if necessary. |
| 0 | 942 |
| 943 if( this == Cyg_Scheduler::get_current_thread() ) | |
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944 Cyg_Scheduler::set_need_reschedule(); |
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945 else Cyg_Scheduler::set_need_reschedule(this); |
| 0 | 946 |
| 947 // Unlock the scheduler and maybe switch threads | |
| 948 Cyg_Scheduler::unlock(); | |
| 949 CYG_REPORT_RETURN(); | |
| 950 } | |
| 951 | |
| 952 #endif | |
| 953 | |
| 954 | |
| 955 // ------------------------------------------------------------------------- | |
| 956 // Thread delay function | |
| 957 | |
| 958 void | |
| 959 Cyg_Thread::delay( cyg_tick_count delay) | |
| 960 { | |
| 961 CYG_REPORT_FUNCTION(); | |
| 962 | |
| 2 | 963 #ifdef CYGFUN_KERNEL_THREADS_TIMER |
| 0 | 964 |
| 965 CYG_INSTRUMENT_THREAD(DELAY,this,delay); | |
| 966 | |
| 967 // Prevent preemption | |
| 968 Cyg_Scheduler::lock(); | |
| 969 | |
| 970 sleep(); | |
| 971 | |
| 972 set_timer( Cyg_Clock::real_time_clock->current_value()+delay, DELAY ); | |
| 973 | |
| 974 // Unlock the scheduler and maybe switch threads | |
| 975 Cyg_Scheduler::unlock(); | |
| 976 | |
| 977 // Clear the timeout. It is irrelevant whether the alarm has | |
| 978 // actually gone off or not. | |
| 979 clear_timer(); | |
| 980 | |
| 981 // and deal with anything else we must do when we return | |
| 982 switch( wake_reason ) { | |
| 983 case DESTRUCT: | |
| 984 case EXIT: | |
| 985 exit(); | |
| 986 break; | |
| 987 | |
| 988 default: | |
| 989 break; | |
| 990 } | |
| 991 #endif | |
| 992 CYG_REPORT_RETURN(); | |
| 993 } | |
| 994 | |
| 995 // ------------------------------------------------------------------------- | |
| 996 // | |
| 997 | |
| 998 #ifdef CYGPKG_KERNEL_EXCEPTIONS | |
| 999 | |
| 1000 void | |
| 1001 Cyg_Thread::deliver_exception( | |
| 1002 cyg_code exception_number, // exception being raised | |
| 1003 CYG_ADDRWORD exception_info // exception specific info | |
| 1004 ) | |
| 1005 { | |
| 1006 if( this == Cyg_Scheduler::get_current_thread() ) | |
| 1007 { | |
| 1008 // Delivering to current thread, probably as a result | |
| 1009 // of a real hardware exception. Simply invoke the appropriate | |
| 1010 // handler. | |
| 1011 | |
| 1012 exception_control.deliver_exception( exception_number, exception_info ); | |
| 1013 } | |
| 1014 #ifdef CYGIMP_EXCEPTION_ASYNC | |
| 1015 else | |
| 1016 { | |
| 1017 // Delivering to another thread, probably as a result of one thread | |
| 1018 // invoking this function on another thread. Adjust the other thread's | |
| 1019 // state to make it execute the exception routine when it next runs. | |
| 1020 | |
| 1021 // At present there is an unresolved problem here. We do not know what | |
| 1022 // state the destination thread is in. It may not be a suitable point at | |
| 1023 // which to invoke an exception routine. In most cases the exception | |
| 1024 // routine will be run in the scheduler thread switch code, where the world is | |
| 1025 // in an inconsistent state. We really need to run the routine at the | |
| 1026 // end of unlock_inner(). However this would add extra code to the scheduler, | |
| 1027 // and require a way of storing pending exceptions. So for now this option is | |
| 1028 // disabled and not yet implemented, it may never be. | |
| 1029 | |
| 1030 } | |
| 1031 #endif | |
| 1032 } | |
| 1033 | |
| 1034 #endif | |
| 1035 | |
| 1036 // ------------------------------------------------------------------------- | |
| 1037 // Per-thread data support | |
| 1038 | |
| 1039 #ifdef CYGVAR_KERNEL_THREADS_DATA | |
| 1040 | |
| 1041 // Set the data map bits for each free slot in the data array. | |
| 1042 cyg_ucount32 Cyg_Thread::thread_data_map = (~CYGNUM_KERNEL_THREADS_DATA_ALL) & | |
|
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1043 (1+(((cyg_ucount32)(1<<(CYGNUM_KERNEL_THREADS_DATA_MAX-1))-1)<<1)); |
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1044 // the second expression is equivalent to ((1<<CYGNUM_KERNEL_THREADS_DATA_MAX)-1); |
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1045 // but avoids overflow. The compiler will compile to a constant just fine. |
| 0 | 1046 |
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1047 Cyg_Thread::cyg_data_index |
| 0 | 1048 Cyg_Thread::new_data_index() |
| 1049 { | |
| 1050 Cyg_Scheduler::lock(); | |
| 1051 | |
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1052 Cyg_Thread::cyg_data_index index; |
| 0 | 1053 |
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1054 if (0 == thread_data_map) |
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1055 return -1; |
| 0 | 1056 |
| 1057 // find ls set bit | |
| 1058 HAL_LSBIT_INDEX( index, thread_data_map ); | |
| 1059 | |
| 1060 // clear the bit | |
| 1061 thread_data_map &= ~(1<<index); | |
| 1062 | |
| 1063 Cyg_Scheduler::unlock(); | |
| 1064 | |
| 1065 return index; | |
| 1066 } | |
| 1067 | |
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1068 void Cyg_Thread::free_data_index( Cyg_Thread::cyg_data_index index ) |
| 0 | 1069 { |
| 1070 Cyg_Scheduler::lock(); | |
| 1071 | |
| 1072 thread_data_map |= (1<<index); | |
| 1073 | |
| 1074 Cyg_Scheduler::unlock(); | |
| 1075 } | |
| 1076 | |
| 1077 | |
| 1078 #endif | |
| 1079 | |
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1080 // ------------------------------------------------------------------------- |
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1081 // Allocate some memory at the lower end of the stack |
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1082 // by moving the stack limit pointer. |
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1083 |
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1084 #if defined(CYGFUN_KERNEL_THREADS_STACK_LIMIT) && \ |
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1085 defined(CYGFUN_KERNEL_THREADS_STACK_CHECKING) |
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1086 // if not doing stack checking, implementation can be found in thread.inl |
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1087 // This implementation puts the magic buffer area (to watch for overruns |
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1088 // *above* the stack limit, i.e. there is no official demarcation between |
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1089 // the stack and the buffer. But that's okay if you think about it... having |
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1090 // a demarcation would not accomplish anything more. |
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1091 void *Cyg_HardwareThread::increment_stack_limit( cyg_ucount32 size ) |
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1092 { |
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1093 void *ret = (void *)stack_limit; |
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1094 |
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1095 // First lock the scheduler because we're going to be tinkering with |
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1096 // the check data |
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1097 Cyg_Scheduler::lock(); |
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1098 |
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1099 // if we've inc'd the limit before, it will be off by the check data |
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1100 // size, so lets correct it |
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1101 if (stack_limit != stack_base) |
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1102 stack_limit -= CYGNUM_KERNEL_THREADS_STACK_CHECK_DATA_SIZE; |
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1103 stack_limit += size; |
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1104 |
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1105 // determine base of check data by rounding up to nearest word aligned |
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1106 // address if not already aligned |
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1107 cyg_uint32 *p = (cyg_uint32 *)((stack_limit + 3) & ~3); |
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1108 // i.e. + sizeof(cyg_uint32)-1) & ~(sizeof(cyg_uint32)-1); |
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1109 cyg_ucount32 i; |
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1110 cyg_uint32 sig = (cyg_uint32)this; |
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1111 |
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1112 for ( i = 0; |
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1113 i < CYGNUM_KERNEL_THREADS_STACK_CHECK_DATA_SIZE/sizeof(cyg_uint32); |
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1114 i++ ) { |
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1115 p[i] = (sig ^ (i * 0x01010101)); |
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1116 } |
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1117 |
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1118 // increment limit by the check size. Note this will not necessarily |
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1119 // reach the end of the check data. But that doesn't really matter. |
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1120 // Doing this allows better checking of the saved stack pointer in |
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1121 // Cyg_Thread::check_this() |
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1122 stack_limit += CYGNUM_KERNEL_THREADS_STACK_CHECK_DATA_SIZE; |
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1123 |
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1124 Cyg_Scheduler::unlock(); |
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1125 |
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1126 return ret; |
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1127 } |
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1128 #endif |
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1129 |
| 0 | 1130 // ========================================================================= |
| 1131 // Cyg_ThreadTimer member functions | |
| 1132 | |
| 1133 // ------------------------------------------------------------------------- | |
| 1134 // Timer alarm function. Inspect the sleep_reason and if necessary wake | |
| 1135 // up the thread with an appropriate wake_reason. | |
| 1136 | |
| 1137 #ifdef CYGFUN_KERNEL_THREADS_TIMER | |
| 1138 | |
| 1139 void | |
| 1140 Cyg_ThreadTimer::alarm( | |
| 1141 Cyg_Alarm *alarm, | |
| 1142 CYG_ADDRWORD data | |
| 1143 ) | |
| 1144 { | |
| 1145 CYG_REPORT_FUNCTION(); | |
| 1146 | |
| 1147 Cyg_ThreadTimer *self = (Cyg_ThreadTimer *)data; | |
| 1148 Cyg_Thread *thread = self->thread; | |
| 1149 | |
| 1150 CYG_INSTRUMENT_THREAD(ALARM, 0, 0); | |
| 1151 | |
| 1152 Cyg_Scheduler::lock(); | |
| 1153 | |
| 1154 Cyg_Thread::cyg_reason sleep_reason = thread->get_sleep_reason(); | |
| 1155 | |
| 1156 switch( sleep_reason ) { | |
| 1157 | |
| 1158 case Cyg_Thread::DESTRUCT: | |
| 1159 case Cyg_Thread::BREAK: | |
| 1160 case Cyg_Thread::EXIT: | |
| 1161 case Cyg_Thread::NONE: | |
| 1162 case Cyg_Thread::WAIT: | |
| 1163 case Cyg_Thread::DONE: | |
| 1164 // Do nothing in any of these cases. Most are here to | |
| 1165 // keep the compiler happy. | |
| 1166 Cyg_Scheduler::unlock(); | |
| 1167 CYG_REPORT_RETURN(); | |
| 1168 return; | |
| 1169 | |
| 1170 case Cyg_Thread::DELAY: | |
| 1171 // The thread was simply delaying, unless it has been | |
| 1172 // woken up for some other reason, wake it now. | |
| 1173 thread->set_wake_reason(Cyg_Thread::DONE); | |
| 1174 break; | |
| 1175 | |
| 1176 case Cyg_Thread::TIMEOUT: | |
| 1177 // The thread has timed out, set the wake reason to | |
| 1178 // TIMEOUT and restart. | |
| 1179 thread->set_wake_reason(Cyg_Thread::TIMEOUT); | |
| 1180 break; | |
| 1181 } | |
| 1182 | |
| 1183 thread->wake(); | |
| 1184 | |
| 1185 Cyg_Scheduler::unlock(); | |
| 1186 CYG_REPORT_RETURN(); | |
| 1187 } | |
| 1188 | |
| 1189 #endif | |
| 1190 | |
| 1191 // ========================================================================= | |
| 1192 // The Idle thread | |
| 1193 // The idle thread is implemented as a single instance of the | |
| 1194 // Cyg_IdleThread class. This is so that it can be initialized before | |
| 1195 // main in a static constructor. | |
| 1196 | |
| 1197 // ------------------------------------------------------------------------- | |
| 1198 // Data definitions | |
| 1199 | |
| 1200 // stack | |
| 2 | 1201 #ifdef CYGNUM_HAL_STACK_SIZE_MINIMUM |
| 1202 # ifdef CYGNUM_KERNEL_THREADS_IDLE_STACK_SIZE | |
| 1203 # if CYGNUM_KERNEL_THREADS_IDLE_STACK_SIZE < CYGNUM_HAL_STACK_SIZE_MINIMUM | |
| 0 | 1204 |
| 2 | 1205 // then override the configured stack size |
| 1206 # undef CYGNUM_KERNEL_THREADS_IDLE_STACK_SIZE | |
| 1207 # define CYGNUM_KERNEL_THREADS_IDLE_STACK_SIZE CYGNUM_HAL_STACK_SIZE_MINIMUM | |
| 1208 | |
| 1209 # endif // CYGNUM_KERNEL_THREADS_IDLE_STACK_SIZE < CYGNUM_HAL_STACK_SIZE_MINIMUM | |
| 1210 # endif // CYGNUM_KERNEL_THREADS_IDLE_STACK_SIZE | |
| 1211 #endif // CYGNUM_HAL_STACK_SIZE_MINIMUM | |
| 1212 | |
| 0 | 1213 // Loop counter for debugging/housekeeping |
| 3023 | 1214 cyg_uint32 volatile idle_thread_loops[CYGNUM_KERNEL_CPU_MAX]; |
| 0 | 1215 |
| 2117 | 1216 static char idle_thread_stack[CYGNUM_KERNEL_CPU_MAX][CYGNUM_KERNEL_THREADS_IDLE_STACK_SIZE]; |
| 1217 | |
| 0 | 1218 // ------------------------------------------------------------------------- |
| 1219 // Idle thread code. | |
| 1220 | |
| 1221 void | |
| 1222 idle_thread_main( CYG_ADDRESS data ) | |
| 1223 { | |
| 1224 CYG_REPORT_FUNCTION(); | |
| 1225 | |
| 1226 for(;;) | |
| 1227 { | |
|
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1228 idle_thread_loops[CYG_KERNEL_CPU_THIS()]++; |
| 0 | 1229 |
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1230 HAL_IDLE_THREAD_ACTION(idle_thread_loops[CYG_KERNEL_CPU_THIS()]); |
| 0 | 1231 |
|
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1232 CYG_ASSERT( Cyg_Scheduler::get_sched_lock() == 0, "Scheduler lock not zero" ); |
| 0 | 1233 #if 0 |
| 1234 // For testing, it is useful to be able to fake | |
| 1235 // clock interrupts in the idle thread. | |
| 1236 | |
| 1237 Cyg_Clock::real_time_clock->tick(); | |
| 1238 #endif | |
| 1239 #ifdef CYGIMP_IDLE_THREAD_YIELD | |
| 1240 // In single priority and non-preemptive systems, | |
| 1241 // the idle thread should yield repeatedly to | |
| 1242 // other threads. | |
| 1243 Cyg_Thread::yield(); | |
| 1244 #endif | |
| 1245 } | |
| 1246 } | |
| 1247 | |
| 1248 // ------------------------------------------------------------------------- | |
| 1249 // Idle thread class | |
| 1250 | |
| 1251 class Cyg_IdleThread : public Cyg_Thread | |
| 1252 { | |
| 1253 public: | |
|
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1254 Cyg_IdleThread(); |
| 0 | 1255 |
| 1256 }; | |
| 1257 | |
| 1258 // ------------------------------------------------------------------------- | |
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1259 // Instantiate the idle thread |
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1260 |
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1261 Cyg_IdleThread idle_thread[CYGNUM_KERNEL_CPU_MAX] CYG_INIT_PRIORITY( IDLE_THREAD ); |
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1262 |
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1263 // ------------------------------------------------------------------------- |
| 0 | 1264 // Idle threads constructor |
| 1265 | |
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1266 Cyg_IdleThread::Cyg_IdleThread() |
| 0 | 1267 : Cyg_Thread( CYG_THREAD_MIN_PRIORITY, |
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1268 idle_thread_main, |
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1269 0, |
| 2404 | 1270 (char *)"Idle Thread", |
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1271 (CYG_ADDRESS)idle_thread_stack[this-&idle_thread[0]], |
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1272 CYGNUM_KERNEL_THREADS_IDLE_STACK_SIZE) |
| 0 | 1273 { |
| 1274 CYG_REPORT_FUNCTION(); | |
| 1275 | |
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1276 // Call into scheduler to set up this thread as the default |
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1277 // current thread for its CPU. |
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1278 |
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1279 Cyg_Scheduler::scheduler.set_idle_thread( this, this-&idle_thread[0] ); |
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1280 |
| 0 | 1281 CYG_REPORT_RETURN(); |
| 1282 } | |
| 1283 | |
| 1284 // ------------------------------------------------------------------------- | |
| 1285 // EOF common/thread.cxx |