Mercurial > ecos-v3_0-branch
annotate packages/kernel/current/src/common/thread.cxx @ 2119:1406c9fadbf3
* src/sched/sched.cxx (thread_entry): Fixed a bug which could
cause a thread to be started with a non-zero scheduler lock. The
previous code only decremented it by 1 so if the previous thread
was executing with the lock > 1 the thread ended up with a
non-zero lock. This is fixed by decrementing the lock in a loop
until it reaches zero.
* src/common/thread.cxx (idle_thread_main): Added an assert for a
non-zero scheduler lock.
| author | nickg |
|---|---|
| date | Thu, 19 Jan 2006 17:53:58 +0000 |
| parents | 5d7f57fd1729 |
| children | ef95b9adfb61 |
| rev | line source |
|---|---|
| 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 Red Hat, 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 version. |
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16 // |
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17 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY |
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18 // WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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19 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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20 // for more details. |
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21 // |
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22 // You should have received a copy of the GNU General Public License along |
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23 // with eCos; if not, write to the Free Software Foundation, Inc., |
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24 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. |
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25 // |
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26 // As a special exception, if other files instantiate templates or use macros |
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27 // or inline functions from this file, or you compile this file and link it |
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28 // with other works to produce a work based on this file, this file does not |
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29 // by itself cause the resulting work to be covered by the GNU General Public |
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30 // License. However the source code for this file must still be made available |
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31 // in accordance with section (3) of the GNU General Public License. |
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32 // |
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33 // This exception does not invalidate any other reasons why a work based on |
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34 // this file might be covered by the GNU General Public License. |
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35 // |
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36 // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc. |
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37 // at http://sources.redhat.com/ecos/ecos-license/ |
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208
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38 // ------------------------------------------- |
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39 //####ECOSGPLCOPYRIGHTEND#### |
| 0 | 40 //========================================================================== |
| 41 //#####DESCRIPTIONBEGIN#### | |
| 42 // | |
| 2 | 43 // Author(s): nickg |
| 44 // Contributors: nickg | |
| 45 // Date: 1997-09-15 | |
| 46 // Purpose: Thread class implementation | |
| 47 // Description: This file contains the definitions of the thread class | |
| 0 | 48 // member functions that are common to all thread implementations. |
| 49 // | |
| 50 //####DESCRIPTIONEND#### | |
| 51 // | |
| 52 //========================================================================== | |
| 53 | |
| 54 #include <pkgconf/kernel.h> // kernel configuration file | |
| 55 | |
| 2 | 56 #include <cyg/hal/hal_arch.h> // HAL_REORDER_BARRIER & |
| 57 // CYGNUM_HAL_STACK_SIZE_TYPICAL | |
| 58 | |
| 0 | 59 #include <cyg/kernel/ktypes.h> // base kernel types |
| 60 #include <cyg/infra/cyg_trac.h> // tracing macros | |
| 61 #include <cyg/infra/cyg_ass.h> // assertion macros | |
| 62 #include <cyg/kernel/instrmnt.h> // instrumentation | |
| 63 | |
| 64 #include <cyg/kernel/thread.hxx> // our header | |
| 65 | |
| 66 #include <cyg/kernel/intr.hxx> // Interrupt support | |
| 67 | |
| 68 #include <cyg/kernel/thread.inl> // thread inlines | |
| 69 #include <cyg/kernel/sched.inl> // scheduler inlines | |
| 70 #include <cyg/kernel/clock.inl> // clock inlines | |
| 71 | |
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72 #ifdef CYGDBG_KERNEL_THREADS_STACK_MEASUREMENT_VERBOSE_EXIT |
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73 #include <cyg/infra/diag.h> |
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74 #endif |
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75 |
| 0 | 76 // ========================================================================= |
| 77 // Cyg_HardwareThread members | |
| 78 | |
| 79 // ------------------------------------------------------------------------- | |
| 80 // Thread entry point. | |
| 81 // This is inserted as the PC value in all initial thread contexts. | |
| 82 // It does some housekeeping and then calls the real entry point. | |
| 83 | |
| 84 void | |
| 85 Cyg_HardwareThread::thread_entry( Cyg_Thread *thread ) | |
| 86 { | |
| 87 CYG_REPORT_FUNCTION(); | |
| 88 | |
| 2117 | 89 // Call the scheduler to do any housekeeping |
| 90 Cyg_Scheduler::scheduler.thread_entry( thread ); | |
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91 |
| 0 | 92 // Call entry point in a loop. |
| 93 for(;;) | |
| 94 { | |
| 95 thread->entry_point(thread->entry_data); | |
| 96 thread->exit(); | |
| 97 } | |
| 98 } | |
| 99 | |
| 100 // ========================================================================= | |
| 101 // Cyg_Thread members | |
| 102 | |
| 103 // ------------------------------------------------------------------------- | |
| 104 // Statics and thread list functions | |
| 105 | |
| 106 #ifdef CYGVAR_KERNEL_THREADS_LIST | |
| 107 | |
| 108 // List of all extant threads | |
| 109 Cyg_Thread *Cyg_Thread::thread_list = 0; | |
| 110 | |
| 111 inline void | |
| 112 Cyg_Thread::add_to_list( void ) | |
| 113 { | |
| 114 // Add thread to housekeeping list | |
| 115 Cyg_Scheduler::lock(); | |
| 116 | |
| 117 if( thread_list == 0 ) | |
| 118 list_next = this; | |
| 119 else { | |
| 120 Cyg_Thread *prev = thread_list; | |
| 121 do { | |
| 122 if ( this == prev ) | |
| 123 break; // found it already! | |
| 124 prev = prev->list_next; | |
| 125 } while ( prev != thread_list ); | |
| 126 if ( this != prev ) { | |
| 127 // insert it in the list: | |
| 128 list_next = thread_list->list_next; | |
| 129 thread_list->list_next = this; | |
| 130 } | |
| 131 } | |
| 132 thread_list = this; | |
| 133 | |
| 134 Cyg_Scheduler::unlock(); | |
| 135 } | |
| 136 | |
| 137 inline void | |
| 138 Cyg_Thread::remove_from_list( void ) | |
| 139 { | |
| 140 // remove thread from housekeeping list | |
| 141 Cyg_Scheduler::lock(); | |
| 142 | |
| 143 Cyg_Thread *prev = thread_list; | |
| 144 | |
| 145 do { | |
| 146 if( prev->list_next == this ) { | |
| 147 prev->list_next = list_next; | |
| 148 if( thread_list == this ) | |
| 149 thread_list = list_next; | |
| 150 break; | |
| 151 } | |
| 152 prev = prev->list_next; | |
| 153 } while ( prev != thread_list ); | |
| 154 | |
| 155 Cyg_Scheduler::unlock(); | |
| 156 } | |
| 157 | |
| 158 #endif | |
| 159 | |
| 160 static cyg_uint16 next_unique_id = 1; | |
| 161 | |
| 162 // ------------------------------------------------------------------------- | |
| 163 // Magic new operator to allow the thread constructor to be | |
| 164 // recalled. | |
| 165 | |
| 166 inline void * | |
| 167 operator new(size_t size, Cyg_Thread *ptr) | |
| 168 { return (void *)ptr; }; | |
| 169 | |
| 170 // Constructor | |
| 171 | |
| 172 Cyg_Thread::Cyg_Thread( | |
| 173 CYG_ADDRWORD sched_info, // Scheduling parameter(s) | |
| 174 cyg_thread_entry *entry, // entry point function | |
| 175 CYG_ADDRWORD entry_data, // entry data | |
| 176 char *name_arg, // thread name cookie | |
| 177 CYG_ADDRESS stack_base, // stack base, NULL = allocate | |
| 178 cyg_ucount32 stack_size // stack size, 0 = use default | |
| 179 ) | |
| 180 : Cyg_HardwareThread(entry, entry_data, stack_size, stack_base), | |
| 181 Cyg_SchedThread(this, sched_info) | |
| 182 #ifdef CYGFUN_KERNEL_THREADS_TIMER | |
| 183 ,timer(this) | |
| 184 #endif | |
| 185 { | |
| 186 CYG_REPORT_FUNCTION(); | |
| 187 | |
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188 CYG_INSTRUMENT_THREAD(CREATE,this,0); |
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189 |
| 0 | 190 // Start the thread in suspended state. |
| 191 state = SUSPENDED; | |
| 192 suspend_count = 1; | |
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193 wakeup_count = 0; |
| 0 | 194 |
| 195 // Initialize sleep_reason which is used by kill, release | |
| 196 sleep_reason = NONE; | |
| 197 wake_reason = NONE; | |
| 198 | |
| 199 // Assign a 16 bit id to the thread. | |
| 200 unique_id = next_unique_id++; | |
| 201 | |
| 202 #ifdef CYGVAR_KERNEL_THREADS_DATA | |
| 203 // Zero all per-thread data entries. | |
| 204 for( int i = 0; i < CYGNUM_KERNEL_THREADS_DATA_MAX; i++ ) | |
| 205 thread_data[i] = 0; | |
| 206 #endif | |
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207 #ifdef CYGSEM_KERNEL_THREADS_DESTRUCTORS_PER_THREAD |
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208 for (int j=0; j<CYGNUM_KERNEL_THREADS_DESTRUCTORS; j++) { |
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209 destructors[j].fn = NULL; |
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210 } |
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211 #endif |
| 0 | 212 #ifdef CYGVAR_KERNEL_THREADS_NAME |
| 213 name = name_arg; | |
| 214 #endif | |
| 215 #ifdef CYGVAR_KERNEL_THREADS_LIST | |
| 216 // Add thread to housekeeping list | |
| 217 add_to_list(); | |
| 218 #endif | |
| 219 | |
| 220 Cyg_Scheduler::scheduler.register_thread(this); | |
| 221 | |
| 222 init_context(this); | |
| 223 | |
| 224 CYG_REPORT_RETURN(); | |
| 225 } | |
| 226 | |
| 227 | |
| 228 // ------------------------------------------------------------------------- | |
| 229 // Re-initialize this thread. | |
| 230 // We do this by re-invoking the constructor with the original | |
| 231 // arguments, which are still available in the object. | |
| 232 | |
| 233 void | |
| 234 Cyg_Thread::reinitialize() | |
| 235 { | |
| 236 CYG_REPORT_FUNCTION(); | |
| 237 | |
| 238 CYG_ASSERTCLASS( this, "Bad thread"); | |
| 239 CYG_ASSERT( this != Cyg_Scheduler::get_current_thread(), | |
| 240 "Attempt to reinitialize current thread"); | |
| 241 CYG_ASSERT( get_current_queue() == NULL , "Thread is still on a queue"); | |
| 242 | |
| 243 #ifdef CYGFUN_KERNEL_THREADS_TIMER | |
| 244 // Clear the timeout. It is irrelevant whether there was | |
| 245 // actually a timeout pending. | |
| 246 timer.disable(); | |
| 247 #endif | |
| 248 | |
| 249 // Ensure the scheduler has let go of us. | |
| 250 Cyg_Scheduler::scheduler.deregister_thread(this); | |
| 251 | |
| 252 cyg_priority pri = get_priority(); | |
| 253 #ifdef CYGVAR_KERNEL_THREADS_NAME | |
| 254 char * name_arg = name; | |
| 255 #else | |
| 256 char * name_arg = NULL; | |
| 257 #endif | |
| 258 | |
| 259 new(this) Cyg_Thread( pri, | |
| 260 entry_point, entry_data, | |
| 261 name_arg, | |
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262 get_stack_base(), get_stack_size() ); |
| 0 | 263 // the constructor re-registers the thread with the scheduler. |
| 264 | |
| 265 CYG_ASSERTCLASS( this, "Thread corrupted by reinitialize"); | |
| 266 | |
| 267 CYG_REPORT_RETURN(); | |
| 268 } | |
| 269 | |
| 270 // ------------------------------------------------------------------------- | |
| 271 // Destructor. | |
| 272 | |
| 273 Cyg_Thread::~Cyg_Thread() | |
| 274 { | |
| 275 CYG_REPORT_FUNCTION(); | |
| 276 | |
| 277 Cyg_Scheduler::scheduler.deregister_thread(this); | |
| 278 | |
| 279 #ifdef CYGVAR_KERNEL_THREADS_LIST | |
| 280 // Remove thread from housekeeping list. | |
| 281 remove_from_list(); | |
| 282 #endif | |
| 283 | |
| 460 | 284 // Zero the unique_id to render this thread inconsistent. |
| 285 unique_id = 0; | |
| 286 | |
| 0 | 287 CYG_REPORT_RETURN(); |
| 288 } | |
| 289 | |
| 290 // ------------------------------------------------------------------------- | |
| 291 // Thread consistency checker. | |
| 292 | |
| 293 #ifdef CYGDBG_USE_ASSERTS | |
| 294 | |
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295 cyg_bool |
| 2 | 296 Cyg_Thread::check_this( cyg_assert_class_zeal zeal) const |
| 0 | 297 { |
| 298 // CYG_REPORT_FUNCTION(); | |
| 299 | |
| 300 // check that we have a non-NULL pointer first | |
| 301 if( this == NULL ) return false; | |
| 302 | |
| 303 switch( zeal ) | |
| 304 { | |
| 305 case cyg_system_test: | |
| 306 case cyg_extreme: | |
| 307 case cyg_thorough: | |
| 308 if( (state & SUSPENDED) && (suspend_count == 0) ) return false; | |
| 309 case cyg_quick: | |
| 2 | 310 // Check that the stackpointer is within its limits. |
| 311 // Note: This does not check the current stackpointer value | |
| 312 // of the executing thread. | |
| 313 if( (stack_ptr > (stack_base + stack_size)) || | |
| 314 (stack_ptr < stack_base) ) return false; | |
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315 #ifdef CYGFUN_KERNEL_THREADS_STACK_LIMIT |
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316 if( stack_ptr < stack_limit ) return false; |
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317 #endif |
| 0 | 318 case cyg_trivial: |
| 319 case cyg_none: | |
| 320 default: | |
| 321 break; | |
| 322 }; | |
| 323 | |
| 324 return true; | |
| 325 } | |
| 326 | |
| 327 #endif | |
| 328 | |
| 329 // ------------------------------------------------------------------------- | |
| 330 // Put the thread to sleep. | |
| 331 // This can only be called by the current thread on itself, hence | |
| 332 // it is a static function. | |
| 333 | |
| 334 void | |
| 335 Cyg_Thread::sleep() | |
| 336 { | |
| 337 CYG_REPORT_FUNCTION(); | |
| 338 | |
| 339 Cyg_Thread *current = Cyg_Scheduler::get_current_thread(); | |
| 340 | |
| 341 CYG_ASSERTCLASS( current, "Bad current thread" ); | |
| 342 | |
| 343 CYG_INSTRUMENT_THREAD(SLEEP,current,0); | |
| 344 | |
| 345 // Prevent preemption | |
| 346 Cyg_Scheduler::lock(); | |
| 347 | |
| 348 // If running, remove from run qs | |
| 349 if ( current->state == RUNNING ) | |
| 350 Cyg_Scheduler::scheduler.rem_thread(current); | |
| 351 | |
| 352 // Set the state | |
| 353 current->state |= SLEEPING; | |
| 354 | |
| 355 // Unlock the scheduler and switch threads | |
| 356 Cyg_Scheduler::unlock(); | |
| 357 | |
| 358 CYG_REPORT_RETURN(); | |
| 359 } | |
| 360 | |
| 361 // ------------------------------------------------------------------------- | |
| 362 // Awaken the thread from sleep. | |
| 363 | |
| 364 void | |
| 365 Cyg_Thread::wake() | |
| 366 { | |
| 367 CYG_REPORT_FUNCTION(); | |
| 368 | |
| 369 CYG_INSTRUMENT_THREAD(WAKE,this,Cyg_Scheduler::current_thread); | |
| 370 | |
| 371 // Prevent preemption | |
| 372 Cyg_Scheduler::lock(); | |
| 373 | |
| 374 if( 0 != (state & SLEEPSET) ) | |
| 375 { | |
| 376 // Set the state | |
| 377 state &= ~SLEEPSET; | |
| 378 | |
| 379 // remove from any queue we were on | |
| 380 remove(); | |
| 381 | |
| 382 // If the thread is now runnable, return it to run queue | |
| 383 if( state == RUNNING ) | |
| 384 Cyg_Scheduler::scheduler.add_thread(this); | |
| 385 | |
| 386 } | |
| 387 | |
| 388 // Unlock the scheduler and maybe switch threads | |
| 389 Cyg_Scheduler::unlock(); | |
| 390 | |
| 391 CYG_REPORT_RETURN(); | |
| 392 } | |
| 393 | |
| 394 // ------------------------------------------------------------------------- | |
| 395 // Put the thread to sleep, with wakeup count. | |
| 396 // This can only be called by the current thread on itself, hence | |
| 397 // it is a static function. | |
| 398 | |
| 399 void | |
| 400 Cyg_Thread::counted_sleep() | |
| 401 { | |
| 402 CYG_REPORT_FUNCTION(); | |
| 403 | |
| 404 Cyg_Thread *current = Cyg_Scheduler::get_current_thread(); | |
| 405 | |
| 406 CYG_ASSERTCLASS( current, "Bad current thread" ); | |
| 407 | |
| 408 CYG_INSTRUMENT_THREAD(SLEEP,current,0); | |
| 409 | |
| 410 // Prevent preemption | |
| 411 Cyg_Scheduler::lock(); | |
| 412 | |
| 413 if ( 0 == current->wakeup_count ) { | |
| 414 set_sleep_reason( Cyg_Thread::WAIT ); | |
| 415 current->sleep(); // prepare to sleep | |
| 416 current->state |= COUNTSLEEP; // Set the state | |
| 417 } | |
| 418 else | |
| 419 // there is a queued wakeup, do not sleep | |
| 420 current->wakeup_count--; | |
| 421 | |
| 422 // Unlock the scheduler and switch threads | |
| 423 Cyg_Scheduler::unlock(); | |
| 424 | |
| 425 // and deal with anything we must do when we return | |
| 426 switch( current->wake_reason ) { | |
| 427 case DESTRUCT: | |
| 428 case EXIT: | |
| 429 current->exit(); | |
| 430 break; | |
| 431 | |
| 432 default: | |
| 433 break; | |
| 434 } | |
| 435 | |
| 436 CYG_REPORT_RETURN(); | |
| 437 } | |
| 438 | |
| 439 // ------------------------------------------------------------------------- | |
| 440 // Put the thread to sleep for a delay, with wakeup count. | |
| 441 // This can only be called by the current thread on itself, hence | |
| 442 // it is a static function. | |
| 443 | |
| 444 #ifdef CYGFUN_KERNEL_THREADS_TIMER | |
| 445 void | |
| 446 Cyg_Thread::counted_sleep( cyg_tick_count delay ) | |
| 447 { | |
| 448 CYG_REPORT_FUNCTION(); | |
| 449 | |
| 450 Cyg_Thread *current = Cyg_Scheduler::get_current_thread(); | |
| 451 | |
| 452 CYG_ASSERTCLASS( current, "Bad current thread" ); | |
| 453 | |
| 454 CYG_INSTRUMENT_THREAD(SLEEP,current,0); | |
| 455 | |
| 456 // Prevent preemption | |
| 457 Cyg_Scheduler::lock(); | |
| 458 | |
| 459 if ( 0 == current->wakeup_count ) { | |
| 460 | |
| 461 // Set the timer (once outside any waiting loop.) | |
| 462 set_timer( Cyg_Clock::real_time_clock->current_value()+delay, | |
| 463 Cyg_Thread::TIMEOUT ); | |
| 464 | |
| 465 // If the timeout is in the past, the wake reason will have been | |
| 466 // set to something other than NONE already. | |
| 467 | |
| 468 if( current->get_wake_reason() == Cyg_Thread::NONE ) | |
| 469 { | |
| 470 set_sleep_reason( Cyg_Thread::TIMEOUT ); | |
| 471 current->sleep(); // prepare to sleep | |
| 472 current->state |= COUNTSLEEP; // Set the state | |
| 473 | |
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474 Cyg_Scheduler::reschedule(); |
| 0 | 475 |
| 476 // clear the timer; if it actually fired, no worries. | |
| 477 clear_timer(); | |
| 478 } | |
| 479 } | |
| 480 else | |
| 481 // there is a queued wakeup, do not sleep | |
| 482 current->wakeup_count--; | |
| 483 | |
| 484 // Unlock the scheduler and switch threads | |
| 485 Cyg_Scheduler::unlock(); | |
| 486 | |
| 487 // and deal with anything we must do when we return | |
| 488 switch( current->wake_reason ) { | |
| 489 case DESTRUCT: | |
| 490 case EXIT: | |
| 491 current->exit(); | |
| 492 break; | |
| 493 | |
| 494 default: | |
| 495 break; | |
| 496 } | |
| 497 | |
| 498 CYG_REPORT_RETURN(); | |
| 499 } | |
| 500 #endif | |
| 501 | |
| 502 // ------------------------------------------------------------------------- | |
| 503 // Awaken the thread from sleep. | |
| 504 | |
| 505 void | |
| 506 Cyg_Thread::counted_wake() | |
| 507 { | |
| 508 CYG_REPORT_FUNCTION(); | |
| 509 | |
| 510 CYG_INSTRUMENT_THREAD(WAKE,this,Cyg_Scheduler::current_thread); | |
| 511 | |
| 512 // Prevent preemption | |
| 513 Cyg_Scheduler::lock(); | |
| 514 | |
| 515 if ( 0 == (state & COUNTSLEEP) ) // already awake, or waiting: | |
| 516 wakeup_count++; // not in a counted sleep anyway. | |
| 517 else { | |
| 518 sleep_reason = NONE; | |
| 519 wake_reason = DONE; | |
| 520 wake(); // and awaken the thread | |
| 521 } | |
| 522 | |
| 523 #ifdef CYGNUM_KERNEL_MAX_COUNTED_WAKE_COUNT_ASSERT | |
| 524 CYG_ASSERT( CYGNUM_KERNEL_MAX_COUNTED_WAKE_COUNT_ASSERT > wakeup_count, | |
| 525 "wakeup_count overflow" ); | |
| 526 #endif | |
| 527 | |
| 528 // Unlock the scheduler and maybe switch threads | |
| 529 Cyg_Scheduler::unlock(); | |
| 530 | |
| 531 CYG_REPORT_RETURN(); | |
| 532 } | |
| 533 | |
| 534 // ------------------------------------------------------------------------- | |
| 535 // Cancel wakeups for this thread and return how many were pending | |
| 536 cyg_uint32 | |
| 537 Cyg_Thread::cancel_counted_wake() | |
| 538 { | |
| 539 CYG_REPORT_FUNCTION(); | |
| 540 | |
| 541 CYG_INSTRUMENT_THREAD(WAKE,this,Cyg_Scheduler::current_thread); | |
| 542 | |
| 543 // Prevent preemption | |
| 544 Cyg_Scheduler::lock(); | |
| 545 | |
| 546 cyg_uint32 result = wakeup_count; | |
| 547 wakeup_count = 0; | |
| 548 | |
| 549 // Unlock the scheduler | |
| 550 Cyg_Scheduler::unlock(); | |
| 551 | |
| 552 CYG_REPORT_RETVAL( result ); | |
| 553 return result; | |
| 554 } | |
| 555 | |
| 556 // ------------------------------------------------------------------------- | |
| 557 // Suspend thread. Increment suspend count and deschedule thread | |
| 558 // if still running. | |
| 559 | |
| 560 void | |
| 561 Cyg_Thread::suspend() | |
| 562 { | |
| 563 CYG_REPORT_FUNCTION(); | |
| 564 | |
| 565 CYG_INSTRUMENT_THREAD(SUSPEND,this,Cyg_Scheduler::current_thread); | |
| 566 | |
| 567 // Prevent preemption | |
| 568 Cyg_Scheduler::lock(); | |
| 569 | |
| 570 suspend_count++; | |
| 571 | |
| 572 #ifdef CYGNUM_KERNEL_MAX_SUSPEND_COUNT_ASSERT | |
| 573 CYG_ASSERT( CYGNUM_KERNEL_MAX_SUSPEND_COUNT_ASSERT > suspend_count, | |
| 574 "suspend_count overflow" ); | |
| 575 #endif | |
| 576 | |
| 577 // If running, remove from run qs | |
| 578 if( state == RUNNING ) | |
| 579 Cyg_Scheduler::scheduler.rem_thread(this); | |
| 580 | |
| 581 // Set the state | |
| 582 state |= SUSPENDED; | |
| 583 | |
| 584 // Unlock the scheduler and maybe switch threads | |
| 585 Cyg_Scheduler::unlock(); | |
| 586 | |
| 587 CYG_REPORT_RETURN(); | |
| 588 } | |
| 589 | |
| 590 // ------------------------------------------------------------------------- | |
| 591 // Resume thread. Decrement suspend count and reschedule if it | |
| 592 // is zero. | |
| 593 | |
| 594 void | |
| 595 Cyg_Thread::resume() | |
| 596 { | |
| 597 CYG_REPORT_FUNCTION(); | |
| 598 | |
| 599 CYG_INSTRUMENT_THREAD(RESUME,this,Cyg_Scheduler::current_thread); | |
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600 |
| 0 | 601 // Prevent preemption |
| 602 Cyg_Scheduler::lock(); | |
| 603 | |
| 604 // If we are about to zero the count, clear the state bit and | |
| 605 // reschedule the thread if possible. | |
| 606 | |
| 607 if( suspend_count == 1 ) | |
| 608 { | |
| 609 suspend_count = 0; | |
| 610 | |
| 611 CYG_ASSERT( (state & SUSPENDED) != 0, "SUSPENDED bit not set" ); | |
| 612 | |
| 613 // Set the state | |
| 614 state &= ~SUSPENDED; | |
| 615 | |
| 616 // Return thread to scheduler if runnable | |
| 617 if( state == RUNNING ) | |
| 618 Cyg_Scheduler::scheduler.add_thread(this); | |
| 619 } | |
| 620 else | |
| 621 if( suspend_count > 0 ) | |
| 622 suspend_count--; | |
| 623 // else ignore attempt to resume | |
| 624 | |
| 625 // Unlock the scheduler and maybe switch threads | |
| 626 Cyg_Scheduler::unlock(); | |
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627 |
| 0 | 628 CYG_REPORT_RETURN(); |
| 629 } | |
| 630 | |
| 631 // ------------------------------------------------------------------------- | |
| 632 // Forced Resume thread. Zero suspend count and reschedule... | |
| 633 | |
| 634 void | |
| 635 Cyg_Thread::force_resume() | |
| 636 { | |
| 637 CYG_REPORT_FUNCTION(); | |
| 638 | |
| 639 CYG_INSTRUMENT_THREAD(RESUME,this,Cyg_Scheduler::current_thread); | |
| 640 | |
| 641 // Prevent preemption | |
| 642 Cyg_Scheduler::lock(); | |
| 643 | |
| 644 // If we are about to zero the count, clear the state bit and | |
| 645 // reschedule the thread if possible. | |
| 646 | |
| 647 if ( 0 < suspend_count ) { | |
| 648 suspend_count = 0; | |
| 649 | |
| 650 CYG_ASSERT( (state & SUSPENDED) != 0, "SUSPENDED bit not set" ); | |
| 651 | |
| 652 // Set the state | |
| 653 state &= ~SUSPENDED; | |
| 654 | |
| 655 // Return thread to scheduler if runnable | |
| 656 if( state == RUNNING ) | |
| 657 Cyg_Scheduler::scheduler.add_thread(this); | |
| 658 } | |
| 659 | |
| 660 // Unlock the scheduler and maybe switch threads | |
| 661 Cyg_Scheduler::unlock(); | |
| 662 CYG_REPORT_RETURN(); | |
| 663 } | |
| 664 | |
| 665 // ------------------------------------------------------------------------- | |
| 666 // Force thread to wake up from a sleep with a wake_reason of | |
| 667 // BREAK. It is the responsibility of the woken thread to detect | |
| 668 // the release() and do the right thing. | |
| 669 | |
| 670 void | |
| 671 Cyg_Thread::release() | |
| 672 { | |
| 673 CYG_REPORT_FUNCTION(); | |
| 674 // Prevent preemption | |
| 675 Cyg_Scheduler::lock(); | |
| 676 | |
| 677 // If the thread is in any of the sleep states, set the | |
| 678 // wake reason and wake it up. | |
| 679 | |
| 680 switch( sleep_reason ) | |
| 681 { | |
| 682 | |
| 683 case NONE: | |
| 684 // The thread is not sleeping for any reason, do nothing. | |
| 685 // drop through... | |
| 686 | |
| 687 case DESTRUCT: | |
| 688 case BREAK: | |
| 689 case EXIT: | |
| 690 case DONE: | |
| 691 // Do nothing in any of these cases. They are here to | |
| 692 // keep the compiler happy. | |
| 693 | |
| 694 Cyg_Scheduler::unlock(); | |
| 695 CYG_REPORT_RETURN(); | |
| 696 return; | |
| 697 | |
| 698 case WAIT: | |
| 699 // The thread was waiting for some sync object to do | |
| 700 // something. | |
| 701 // drop through... | |
| 702 | |
| 703 case TIMEOUT: | |
| 704 // The thread was waiting on a sync object with a timeout. | |
| 705 // drop through... | |
| 706 | |
| 707 case DELAY: | |
| 708 // The thread was simply delaying, unless it has been | |
| 709 // woken up for some other reason, wake it now. | |
| 710 sleep_reason = NONE; | |
| 711 wake_reason = BREAK; | |
| 712 break; | |
| 713 } | |
| 714 | |
| 715 wake(); | |
| 716 | |
| 717 // Allow preemption | |
| 718 Cyg_Scheduler::unlock(); | |
| 719 | |
| 720 CYG_REPORT_RETURN(); | |
| 721 } | |
| 722 | |
| 723 // ------------------------------------------------------------------------- | |
| 724 // Exit thread. This puts the thread into EXITED state. | |
| 725 | |
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726 #ifdef CYGPKG_KERNEL_THREADS_DESTRUCTORS |
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727 #ifndef CYGSEM_KERNEL_THREADS_DESTRUCTORS_PER_THREAD |
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728 Cyg_Thread::Cyg_Destructor_Entry |
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729 Cyg_Thread::destructors[ CYGNUM_KERNEL_THREADS_DESTRUCTORS ]; |
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730 #endif |
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731 #endif |
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732 |
| 0 | 733 void |
| 734 Cyg_Thread::exit() | |
| 735 { | |
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736 CYG_REPORT_FUNCTION(); |
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737 |
| 0 | 738 // The thread should never return from this function. |
| 739 | |
| 740 Cyg_Thread *self = Cyg_Thread::self(); | |
| 741 | |
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742 #ifdef CYGPKG_KERNEL_THREADS_DESTRUCTORS |
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743 cyg_ucount16 i; |
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744 for (i=0; i<CYGNUM_KERNEL_THREADS_DESTRUCTORS; i++) { |
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745 if (NULL != self->destructors[i].fn) { |
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746 destructor_fn fn = self->destructors[i].fn; |
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747 CYG_ADDRWORD data = self->destructors[i].data; |
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748 fn(data); |
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749 } |
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750 } |
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751 #endif |
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752 #ifdef CYGDBG_KERNEL_THREADS_STACK_MEASUREMENT_VERBOSE_EXIT |
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753 diag_printf( "Stack usage for thread %08x: %d\n", self, |
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754 self->measure_stack_usage() ); |
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755 #endif |
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756 |
| 0 | 757 Cyg_Scheduler::lock(); |
| 758 | |
| 759 // clear the timer; if there was none, no worries. | |
| 760 clear_timer(); | |
| 761 | |
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762 // It is possible that we have already been killed by another |
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763 // thread, in which case we do not want to try and take ourself |
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764 // out of the scheduler again. |
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765 if( self->state != EXITED ) |
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766 { |
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767 self->state = EXITED; |
| 0 | 768 |
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769 Cyg_Scheduler::scheduler.rem_thread(self); |
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770 } |
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771 |
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772 Cyg_Scheduler::reschedule(); |
| 0 | 773 } |
| 774 | |
| 775 // ------------------------------------------------------------------------- | |
| 776 // Kill thread. Force the thread into EXITED state externally, or | |
| 777 // make it wake up and call exit(). | |
| 778 | |
| 779 void | |
| 780 Cyg_Thread::kill() | |
| 781 { | |
| 782 CYG_REPORT_FUNCTION(); | |
| 783 // If this is called by the current thread on itself, | |
| 784 // just call exit(), which is what he should have done | |
| 785 // in the first place. | |
| 786 if( this == Cyg_Scheduler::get_current_thread() ) | |
| 787 exit(); | |
| 788 | |
| 789 // Prevent preemption | |
| 790 Cyg_Scheduler::lock(); | |
| 791 | |
| 792 // We are killing someone else. Find out what state he is | |
| 793 // in and force him to wakeup and call exit(). | |
| 794 | |
| 795 force_resume(); // this is necessary for when | |
| 796 // he is asleep AND suspended. | |
| 797 #ifdef CYGFUN_KERNEL_THREADS_TIMER | |
| 798 timer.disable(); // and make sure the timer | |
| 799 // does not persist. | |
| 800 #endif | |
| 801 | |
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802 if ( EXIT != wake_reason ) switch( sleep_reason ) { |
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803 // Only do any of this if the thread is not in pending death already: |
| 0 | 804 |
| 805 case NONE: | |
| 806 // The thread is not sleeping for any reason, it must be | |
| 807 // on a run queue. | |
| 808 // We can safely deschedule and set its state. | |
| 809 if( state == RUNNING ) Cyg_Scheduler::scheduler.rem_thread(this); | |
| 810 state = EXITED; | |
| 811 break; | |
| 812 | |
| 813 case DESTRUCT: | |
| 814 case BREAK: | |
| 815 case EXIT: | |
| 816 case DONE: | |
| 817 // Do nothing in any of these cases. They are here to | |
| 818 // keep the compiler happy. | |
| 819 | |
| 820 Cyg_Scheduler::unlock(); | |
| 821 CYG_REPORT_RETURN(); | |
| 822 return; | |
| 823 | |
| 824 case WAIT: | |
| 825 // The thread was waiting for some sync object to do | |
| 826 // something. | |
| 827 // drop through... | |
| 828 | |
| 829 case TIMEOUT: | |
| 830 // The thread was waiting on a sync object with a timeout. | |
| 831 // drop through... | |
| 832 | |
| 833 case DELAY: | |
| 834 // The thread was simply delaying, unless it has been | |
| 835 // woken up for some other reason, wake it now. | |
| 836 sleep_reason = NONE; | |
| 837 wake_reason = EXIT; | |
| 838 break; | |
| 839 } | |
| 840 | |
| 841 wake(); | |
| 842 | |
| 843 // Allow preemption | |
| 844 Cyg_Scheduler::unlock(); | |
| 845 CYG_REPORT_RETURN(); | |
| 846 } | |
| 847 | |
| 848 // ------------------------------------------------------------------------- | |
| 849 // Set thread priority | |
| 850 | |
| 851 #ifdef CYGIMP_THREAD_PRIORITY | |
| 852 | |
| 853 void | |
| 854 Cyg_Thread::set_priority( cyg_priority new_priority ) | |
| 855 { | |
| 856 CYG_REPORT_FUNCTION(); | |
| 857 | |
| 858 // CYG_ASSERT( new_priority >= CYG_THREAD_MAX_PRIORITY, "Priority out of range"); | |
| 859 // CYG_ASSERT( new_priority <= CYG_THREAD_MIN_PRIORITY, "Priority out of range"); | |
| 860 | |
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861 CYG_INSTRUMENT_THREAD(PRIORITY,this,new_priority); |
| 0 | 862 |
| 863 // Prevent preemption | |
| 864 Cyg_Scheduler::lock(); | |
| 865 | |
| 866 Cyg_ThreadQueue *queue = NULL; | |
| 867 | |
| 868 // If running, remove from run qs | |
| 869 if( state == RUNNING ) | |
| 870 Cyg_Scheduler::scheduler.rem_thread(this); | |
| 871 else if( state & SLEEPING ) | |
| 872 { | |
| 873 // Remove thread from current queue. | |
| 874 queue = get_current_queue(); | |
| 875 // if indeed we are on a queue | |
| 876 if ( NULL != queue ) { | |
| 877 CYG_CHECK_DATA_PTR(queue, "Bad queue pointer"); | |
| 878 remove(); | |
| 879 } | |
| 880 } | |
| 881 | |
| 882 Cyg_Scheduler::scheduler.deregister_thread(this); | |
| 883 | |
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884 #if CYGINT_KERNEL_SCHEDULER_UNIQUE_PRIORITIES |
| 0 | 885 |
| 886 // Check that there are no other threads at this priority. | |
| 887 // If so, leave is as it is. | |
| 888 | |
| 889 CYG_ASSERT( Cyg_Scheduler::scheduler.unique(new_priority), "Priority not unique"); | |
| 890 | |
| 891 if( Cyg_Scheduler::scheduler.unique(new_priority) ) | |
| 892 priority = new_priority; | |
| 893 | |
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894 #else // !CYGINT_KERNEL_SCHEDULER_UNIQUE_PRIORITIES |
| 0 | 895 |
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896 #ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_SIMPLE |
| 0 | 897 |
| 898 // When we have priority inheritance, we must update the original | |
| 899 // priority and not the inherited one. If the new priority is | |
| 900 // better than the current inherited one, then use that | |
| 901 // immediately. We remain in inherited state to avoid problems | |
| 902 // with multiple mutex inheritances. | |
| 903 | |
| 904 if( priority_inherited ) | |
| 905 { | |
| 906 original_priority = new_priority; | |
| 907 if( priority > new_priority ) priority = new_priority; | |
| 908 } | |
| 909 else priority = new_priority; | |
| 910 | |
| 911 #else | |
| 912 | |
| 913 priority = new_priority; | |
| 914 | |
| 915 #endif | |
| 916 | |
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917 #endif // CYGINT_KERNEL_SCHEDULER_UNIQUE_PRIORITIES |
| 0 | 918 |
| 919 Cyg_Scheduler::scheduler.register_thread(this); | |
| 920 | |
| 921 // Return thread to scheduler if runnable | |
| 922 if( state == RUNNING ) | |
| 923 Cyg_Scheduler::scheduler.add_thread(this); | |
| 924 else if ( state & SLEEPING ) | |
| 925 { | |
| 926 // return to current queue | |
| 927 // if indeed we are on a queue | |
| 928 if ( NULL != queue ) { | |
| 929 CYG_CHECK_DATA_PTR(queue, "Bad queue pointer"); | |
| 930 queue->enqueue(this); | |
| 931 } | |
| 932 } | |
| 933 | |
| 934 // If the current thread is being reprioritized, set the | |
| 935 // reschedule flag to ensure that it gets rescheduled if | |
| 936 // necessary. (Strictly we only need to do this if the new | |
| 937 // priority is less than that of some other runnable thread, in | |
| 938 // practice checking that is as expensive as what the scheduler | |
| 939 // will do anyway). | |
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940 // If it is not the current thread then we need to see whether |
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941 // it is more worthy of execution than any current thread and |
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942 // rescheduled if necessary. |
| 0 | 943 |
| 944 if( this == Cyg_Scheduler::get_current_thread() ) | |
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945 Cyg_Scheduler::set_need_reschedule(); |
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946 else Cyg_Scheduler::set_need_reschedule(this); |
| 0 | 947 |
| 948 // Unlock the scheduler and maybe switch threads | |
| 949 Cyg_Scheduler::unlock(); | |
| 950 CYG_REPORT_RETURN(); | |
| 951 } | |
| 952 | |
| 953 #endif | |
| 954 | |
| 955 | |
| 956 // ------------------------------------------------------------------------- | |
| 957 // Thread delay function | |
| 958 | |
| 959 void | |
| 960 Cyg_Thread::delay( cyg_tick_count delay) | |
| 961 { | |
| 962 CYG_REPORT_FUNCTION(); | |
| 963 | |
| 2 | 964 #ifdef CYGFUN_KERNEL_THREADS_TIMER |
| 0 | 965 |
| 966 CYG_INSTRUMENT_THREAD(DELAY,this,delay); | |
| 967 | |
| 968 // Prevent preemption | |
| 969 Cyg_Scheduler::lock(); | |
| 970 | |
| 971 sleep(); | |
| 972 | |
| 973 set_timer( Cyg_Clock::real_time_clock->current_value()+delay, DELAY ); | |
| 974 | |
| 975 // Unlock the scheduler and maybe switch threads | |
| 976 Cyg_Scheduler::unlock(); | |
| 977 | |
| 978 // Clear the timeout. It is irrelevant whether the alarm has | |
| 979 // actually gone off or not. | |
| 980 clear_timer(); | |
| 981 | |
| 982 // and deal with anything else we must do when we return | |
| 983 switch( wake_reason ) { | |
| 984 case DESTRUCT: | |
| 985 case EXIT: | |
| 986 exit(); | |
| 987 break; | |
| 988 | |
| 989 default: | |
| 990 break; | |
| 991 } | |
| 992 #endif | |
| 993 CYG_REPORT_RETURN(); | |
| 994 } | |
| 995 | |
| 996 // ------------------------------------------------------------------------- | |
| 997 // | |
| 998 | |
| 999 #ifdef CYGPKG_KERNEL_EXCEPTIONS | |
| 1000 | |
| 1001 void | |
| 1002 Cyg_Thread::deliver_exception( | |
| 1003 cyg_code exception_number, // exception being raised | |
| 1004 CYG_ADDRWORD exception_info // exception specific info | |
| 1005 ) | |
| 1006 { | |
| 1007 if( this == Cyg_Scheduler::get_current_thread() ) | |
| 1008 { | |
| 1009 // Delivering to current thread, probably as a result | |
| 1010 // of a real hardware exception. Simply invoke the appropriate | |
| 1011 // handler. | |
| 1012 | |
| 1013 exception_control.deliver_exception( exception_number, exception_info ); | |
| 1014 } | |
| 1015 #ifdef CYGIMP_EXCEPTION_ASYNC | |
| 1016 else | |
| 1017 { | |
| 1018 // Delivering to another thread, probably as a result of one thread | |
| 1019 // invoking this function on another thread. Adjust the other thread's | |
| 1020 // state to make it execute the exception routine when it next runs. | |
| 1021 | |
| 1022 // At present there is an unresolved problem here. We do not know what | |
| 1023 // state the destination thread is in. It may not be a suitable point at | |
| 1024 // which to invoke an exception routine. In most cases the exception | |
| 1025 // routine will be run in the scheduler thread switch code, where the world is | |
| 1026 // in an inconsistent state. We really need to run the routine at the | |
| 1027 // end of unlock_inner(). However this would add extra code to the scheduler, | |
| 1028 // and require a way of storing pending exceptions. So for now this option is | |
| 1029 // disabled and not yet implemented, it may never be. | |
| 1030 | |
| 1031 } | |
| 1032 #endif | |
| 1033 } | |
| 1034 | |
| 1035 #endif | |
| 1036 | |
| 1037 // ------------------------------------------------------------------------- | |
| 1038 // Per-thread data support | |
| 1039 | |
| 1040 #ifdef CYGVAR_KERNEL_THREADS_DATA | |
| 1041 | |
| 1042 // Set the data map bits for each free slot in the data array. | |
| 1043 cyg_ucount32 Cyg_Thread::thread_data_map = (~CYGNUM_KERNEL_THREADS_DATA_ALL) & | |
|
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1044 (1+(((cyg_ucount32)(1<<(CYGNUM_KERNEL_THREADS_DATA_MAX-1))-1)<<1)); |
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1045 // the second expression is equivalent to ((1<<CYGNUM_KERNEL_THREADS_DATA_MAX)-1); |
|
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1046 // but avoids overflow. The compiler will compile to a constant just fine. |
| 0 | 1047 |
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1048 Cyg_Thread::cyg_data_index |
| 0 | 1049 Cyg_Thread::new_data_index() |
| 1050 { | |
| 1051 Cyg_Scheduler::lock(); | |
| 1052 | |
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1053 Cyg_Thread::cyg_data_index index; |
| 0 | 1054 |
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1055 if (0 == thread_data_map) |
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1056 return -1; |
| 0 | 1057 |
| 1058 // find ls set bit | |
| 1059 HAL_LSBIT_INDEX( index, thread_data_map ); | |
| 1060 | |
| 1061 // clear the bit | |
| 1062 thread_data_map &= ~(1<<index); | |
| 1063 | |
| 1064 Cyg_Scheduler::unlock(); | |
| 1065 | |
| 1066 return index; | |
| 1067 } | |
| 1068 | |
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1069 void Cyg_Thread::free_data_index( Cyg_Thread::cyg_data_index index ) |
| 0 | 1070 { |
| 1071 Cyg_Scheduler::lock(); | |
| 1072 | |
| 1073 thread_data_map |= (1<<index); | |
| 1074 | |
| 1075 Cyg_Scheduler::unlock(); | |
| 1076 } | |
| 1077 | |
| 1078 | |
| 1079 #endif | |
| 1080 | |
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1081 // ------------------------------------------------------------------------- |
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1082 // Allocate some memory at the lower end of the stack |
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1083 // by moving the stack limit pointer. |
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1084 |
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1085 #if defined(CYGFUN_KERNEL_THREADS_STACK_LIMIT) && \ |
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1086 defined(CYGFUN_KERNEL_THREADS_STACK_CHECKING) |
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1087 // if not doing stack checking, implementation can be found in thread.inl |
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1088 // This implementation puts the magic buffer area (to watch for overruns |
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1089 // *above* the stack limit, i.e. there is no official demarcation between |
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1090 // the stack and the buffer. But that's okay if you think about it... having |
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1091 // a demarcation would not accomplish anything more. |
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1092 void *Cyg_HardwareThread::increment_stack_limit( cyg_ucount32 size ) |
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1093 { |
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1094 void *ret = (void *)stack_limit; |
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1095 |
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1096 // First lock the scheduler because we're going to be tinkering with |
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1097 // the check data |
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1098 Cyg_Scheduler::lock(); |
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1099 |
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1100 // if we've inc'd the limit before, it will be off by the check data |
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1101 // size, so lets correct it |
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1102 if (stack_limit != stack_base) |
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1103 stack_limit -= CYGNUM_KERNEL_THREADS_STACK_CHECK_DATA_SIZE; |
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1104 stack_limit += size; |
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1105 |
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1106 // determine base of check data by rounding up to nearest word aligned |
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1107 // address if not already aligned |
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1108 cyg_uint32 *p = (cyg_uint32 *)((stack_limit + 3) & ~3); |
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1109 // i.e. + sizeof(cyg_uint32)-1) & ~(sizeof(cyg_uint32)-1); |
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1110 cyg_ucount32 i; |
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1111 cyg_uint32 sig = (cyg_uint32)this; |
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1112 |
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1113 for ( i = 0; |
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1114 i < CYGNUM_KERNEL_THREADS_STACK_CHECK_DATA_SIZE/sizeof(cyg_uint32); |
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1115 i++ ) { |
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1116 p[i] = (sig ^ (i * 0x01010101)); |
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1117 } |
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1118 |
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1119 // increment limit by the check size. Note this will not necessarily |
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1120 // reach the end of the check data. But that doesn't really matter. |
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1121 // Doing this allows better checking of the saved stack pointer in |
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1122 // Cyg_Thread::check_this() |
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1123 stack_limit += CYGNUM_KERNEL_THREADS_STACK_CHECK_DATA_SIZE; |
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1124 |
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1125 Cyg_Scheduler::unlock(); |
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1126 |
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1127 return ret; |
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1128 } |
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1129 #endif |
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1130 |
| 0 | 1131 // ========================================================================= |
| 1132 // Cyg_ThreadTimer member functions | |
| 1133 | |
| 1134 // ------------------------------------------------------------------------- | |
| 1135 // Timer alarm function. Inspect the sleep_reason and if necessary wake | |
| 1136 // up the thread with an appropriate wake_reason. | |
| 1137 | |
| 1138 #ifdef CYGFUN_KERNEL_THREADS_TIMER | |
| 1139 | |
| 1140 void | |
| 1141 Cyg_ThreadTimer::alarm( | |
| 1142 Cyg_Alarm *alarm, | |
| 1143 CYG_ADDRWORD data | |
| 1144 ) | |
| 1145 { | |
| 1146 CYG_REPORT_FUNCTION(); | |
| 1147 | |
| 1148 Cyg_ThreadTimer *self = (Cyg_ThreadTimer *)data; | |
| 1149 Cyg_Thread *thread = self->thread; | |
| 1150 | |
| 1151 CYG_INSTRUMENT_THREAD(ALARM, 0, 0); | |
| 1152 | |
| 1153 Cyg_Scheduler::lock(); | |
| 1154 | |
| 1155 Cyg_Thread::cyg_reason sleep_reason = thread->get_sleep_reason(); | |
| 1156 | |
| 1157 switch( sleep_reason ) { | |
| 1158 | |
| 1159 case Cyg_Thread::DESTRUCT: | |
| 1160 case Cyg_Thread::BREAK: | |
| 1161 case Cyg_Thread::EXIT: | |
| 1162 case Cyg_Thread::NONE: | |
| 1163 case Cyg_Thread::WAIT: | |
| 1164 case Cyg_Thread::DONE: | |
| 1165 // Do nothing in any of these cases. Most are here to | |
| 1166 // keep the compiler happy. | |
| 1167 Cyg_Scheduler::unlock(); | |
| 1168 CYG_REPORT_RETURN(); | |
| 1169 return; | |
| 1170 | |
| 1171 case Cyg_Thread::DELAY: | |
| 1172 // The thread was simply delaying, unless it has been | |
| 1173 // woken up for some other reason, wake it now. | |
| 1174 thread->set_wake_reason(Cyg_Thread::DONE); | |
| 1175 break; | |
| 1176 | |
| 1177 case Cyg_Thread::TIMEOUT: | |
| 1178 // The thread has timed out, set the wake reason to | |
| 1179 // TIMEOUT and restart. | |
| 1180 thread->set_wake_reason(Cyg_Thread::TIMEOUT); | |
| 1181 break; | |
| 1182 } | |
| 1183 | |
| 1184 thread->wake(); | |
| 1185 | |
| 1186 Cyg_Scheduler::unlock(); | |
| 1187 CYG_REPORT_RETURN(); | |
| 1188 } | |
| 1189 | |
| 1190 #endif | |
| 1191 | |
| 1192 // ========================================================================= | |
| 1193 // The Idle thread | |
| 1194 // The idle thread is implemented as a single instance of the | |
| 1195 // Cyg_IdleThread class. This is so that it can be initialized before | |
| 1196 // main in a static constructor. | |
| 1197 | |
| 1198 // ------------------------------------------------------------------------- | |
| 1199 // Data definitions | |
| 1200 | |
| 1201 // stack | |
| 2 | 1202 #ifdef CYGNUM_HAL_STACK_SIZE_MINIMUM |
| 1203 # ifdef CYGNUM_KERNEL_THREADS_IDLE_STACK_SIZE | |
| 1204 # if CYGNUM_KERNEL_THREADS_IDLE_STACK_SIZE < CYGNUM_HAL_STACK_SIZE_MINIMUM | |
| 0 | 1205 |
| 2 | 1206 // then override the configured stack size |
| 1207 # undef CYGNUM_KERNEL_THREADS_IDLE_STACK_SIZE | |
| 1208 # define CYGNUM_KERNEL_THREADS_IDLE_STACK_SIZE CYGNUM_HAL_STACK_SIZE_MINIMUM | |
| 1209 | |
| 1210 # endif // CYGNUM_KERNEL_THREADS_IDLE_STACK_SIZE < CYGNUM_HAL_STACK_SIZE_MINIMUM | |
| 1211 # endif // CYGNUM_KERNEL_THREADS_IDLE_STACK_SIZE | |
| 1212 #endif // CYGNUM_HAL_STACK_SIZE_MINIMUM | |
| 1213 | |
| 0 | 1214 // Loop counter for debugging/housekeeping |
|
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1215 cyg_uint32 idle_thread_loops[CYGNUM_KERNEL_CPU_MAX]; |
| 0 | 1216 |
| 2117 | 1217 static char idle_thread_stack[CYGNUM_KERNEL_CPU_MAX][CYGNUM_KERNEL_THREADS_IDLE_STACK_SIZE]; |
| 1218 | |
| 0 | 1219 // ------------------------------------------------------------------------- |
| 1220 // Idle thread code. | |
| 1221 | |
| 1222 void | |
| 1223 idle_thread_main( CYG_ADDRESS data ) | |
| 1224 { | |
| 1225 CYG_REPORT_FUNCTION(); | |
| 1226 | |
| 1227 for(;;) | |
| 1228 { | |
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1229 idle_thread_loops[CYG_KERNEL_CPU_THIS()]++; |
| 0 | 1230 |
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1231 HAL_IDLE_THREAD_ACTION(idle_thread_loops[CYG_KERNEL_CPU_THIS()]); |
| 0 | 1232 |
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2119
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1233 CYG_ASSERT( Cyg_Scheduler::get_sched_lock() == 0, "Scheduler lock not zero" ); |
| 0 | 1234 #if 0 |
| 1235 // For testing, it is useful to be able to fake | |
| 1236 // clock interrupts in the idle thread. | |
| 1237 | |
| 1238 Cyg_Clock::real_time_clock->tick(); | |
| 1239 #endif | |
| 1240 #ifdef CYGIMP_IDLE_THREAD_YIELD | |
| 1241 // In single priority and non-preemptive systems, | |
| 1242 // the idle thread should yield repeatedly to | |
| 1243 // other threads. | |
| 1244 Cyg_Thread::yield(); | |
| 1245 #endif | |
| 1246 } | |
| 1247 } | |
| 1248 | |
| 1249 // ------------------------------------------------------------------------- | |
| 1250 // Idle thread class | |
| 1251 | |
| 1252 class Cyg_IdleThread : public Cyg_Thread | |
| 1253 { | |
| 1254 public: | |
|
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1255 Cyg_IdleThread(); |
| 0 | 1256 |
| 1257 }; | |
| 1258 | |
| 1259 // ------------------------------------------------------------------------- | |
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1260 // Instantiate the idle thread |
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1261 |
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1262 Cyg_IdleThread idle_thread[CYGNUM_KERNEL_CPU_MAX] CYG_INIT_PRIORITY( IDLE_THREAD ); |
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1263 |
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1264 // ------------------------------------------------------------------------- |
| 0 | 1265 // Idle threads constructor |
| 1266 | |
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1267 Cyg_IdleThread::Cyg_IdleThread() |
| 0 | 1268 : Cyg_Thread( CYG_THREAD_MIN_PRIORITY, |
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1269 idle_thread_main, |
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1270 0, |
| 0 | 1271 "Idle Thread", |
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1272 (CYG_ADDRESS)idle_thread_stack[this-&idle_thread[0]], |
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1273 CYGNUM_KERNEL_THREADS_IDLE_STACK_SIZE) |
| 0 | 1274 { |
| 1275 CYG_REPORT_FUNCTION(); | |
| 1276 | |
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1277 // Call into scheduler to set up this thread as the default |
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1278 // current thread for its CPU. |
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1279 |
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1280 Cyg_Scheduler::scheduler.set_idle_thread( this, this-&idle_thread[0] ); |
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1281 |
| 0 | 1282 CYG_REPORT_RETURN(); |
| 1283 } | |
| 1284 | |
| 1285 // ------------------------------------------------------------------------- | |
| 1286 // EOF common/thread.cxx |