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annotate packages/kernel/current/src/common/thread.cxx @ 1777:c16341b1bac6 default tip
* Added execute permissions to files missed in conversion from CVS
| author | alexs |
|---|---|
| date | Mon, 12 Oct 2009 02:26:09 +0100 |
| parents | 7002f6e48db9 |
| 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 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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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 | |
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89 Cyg_Scheduler::scheduler.clear_need_reschedule(); // finished rescheduling |
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90 Cyg_Scheduler::scheduler.set_current_thread(thread); // restore current thread pointer |
| 0 | 91 |
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92 CYG_INSTRUMENT_THREAD(ENTER,thread,0); |
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93 |
| 0 | 94 #ifdef CYGSEM_KERNEL_SCHED_TIMESLICE |
| 95 // Reset the timeslice counter so that this thread gets a full | |
| 96 // quantum. | |
| 97 Cyg_Scheduler::reset_timeslice_count(); | |
| 98 #endif | |
| 99 | |
| 100 // Zero the lock | |
| 2 | 101 HAL_REORDER_BARRIER (); // Prevent the compiler from moving |
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102 Cyg_Scheduler::zero_sched_lock(); // the assignment into the code above. |
| 2 | 103 HAL_REORDER_BARRIER(); |
| 0 | 104 |
| 105 // Call entry point in a loop. | |
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106 |
| 0 | 107 for(;;) |
| 108 { | |
| 109 thread->entry_point(thread->entry_data); | |
| 110 thread->exit(); | |
| 111 } | |
| 112 } | |
| 113 | |
| 114 // ========================================================================= | |
| 115 // Cyg_Thread members | |
| 116 | |
| 117 // ------------------------------------------------------------------------- | |
| 118 // Statics and thread list functions | |
| 119 | |
| 120 #ifdef CYGVAR_KERNEL_THREADS_LIST | |
| 121 | |
| 122 // List of all extant threads | |
| 123 Cyg_Thread *Cyg_Thread::thread_list = 0; | |
| 124 | |
| 125 inline void | |
| 126 Cyg_Thread::add_to_list( void ) | |
| 127 { | |
| 128 // Add thread to housekeeping list | |
| 129 Cyg_Scheduler::lock(); | |
| 130 | |
| 131 if( thread_list == 0 ) | |
| 132 list_next = this; | |
| 133 else { | |
| 134 Cyg_Thread *prev = thread_list; | |
| 135 do { | |
| 136 if ( this == prev ) | |
| 137 break; // found it already! | |
| 138 prev = prev->list_next; | |
| 139 } while ( prev != thread_list ); | |
| 140 if ( this != prev ) { | |
| 141 // insert it in the list: | |
| 142 list_next = thread_list->list_next; | |
| 143 thread_list->list_next = this; | |
| 144 } | |
| 145 } | |
| 146 thread_list = this; | |
| 147 | |
| 148 Cyg_Scheduler::unlock(); | |
| 149 } | |
| 150 | |
| 151 inline void | |
| 152 Cyg_Thread::remove_from_list( void ) | |
| 153 { | |
| 154 // remove thread from housekeeping list | |
| 155 Cyg_Scheduler::lock(); | |
| 156 | |
| 157 Cyg_Thread *prev = thread_list; | |
| 158 | |
| 159 do { | |
| 160 if( prev->list_next == this ) { | |
| 161 prev->list_next = list_next; | |
| 162 if( thread_list == this ) | |
| 163 thread_list = list_next; | |
| 164 break; | |
| 165 } | |
| 166 prev = prev->list_next; | |
| 167 } while ( prev != thread_list ); | |
| 168 | |
| 169 Cyg_Scheduler::unlock(); | |
| 170 } | |
| 171 | |
| 172 #endif | |
| 173 | |
| 174 static cyg_uint16 next_unique_id = 1; | |
| 175 | |
| 176 // ------------------------------------------------------------------------- | |
| 177 // Magic new operator to allow the thread constructor to be | |
| 178 // recalled. | |
| 179 | |
| 180 inline void * | |
| 181 operator new(size_t size, Cyg_Thread *ptr) | |
| 182 { return (void *)ptr; }; | |
| 183 | |
| 184 // Constructor | |
| 185 | |
| 186 Cyg_Thread::Cyg_Thread( | |
| 187 CYG_ADDRWORD sched_info, // Scheduling parameter(s) | |
| 188 cyg_thread_entry *entry, // entry point function | |
| 189 CYG_ADDRWORD entry_data, // entry data | |
| 190 char *name_arg, // thread name cookie | |
| 191 CYG_ADDRESS stack_base, // stack base, NULL = allocate | |
| 192 cyg_ucount32 stack_size // stack size, 0 = use default | |
| 193 ) | |
| 194 : Cyg_HardwareThread(entry, entry_data, stack_size, stack_base), | |
| 195 Cyg_SchedThread(this, sched_info) | |
| 196 #ifdef CYGFUN_KERNEL_THREADS_TIMER | |
| 197 ,timer(this) | |
| 198 #endif | |
| 199 { | |
| 200 CYG_REPORT_FUNCTION(); | |
| 201 | |
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202 CYG_INSTRUMENT_THREAD(CREATE,this,0); |
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203 |
| 0 | 204 // Start the thread in suspended state. |
| 205 state = SUSPENDED; | |
| 206 suspend_count = 1; | |
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207 wakeup_count = 0; |
| 0 | 208 |
| 209 // Initialize sleep_reason which is used by kill, release | |
| 210 sleep_reason = NONE; | |
| 211 wake_reason = NONE; | |
| 212 | |
| 213 // Assign a 16 bit id to the thread. | |
| 214 unique_id = next_unique_id++; | |
| 215 | |
| 216 #ifdef CYGVAR_KERNEL_THREADS_DATA | |
| 217 // Zero all per-thread data entries. | |
| 218 for( int i = 0; i < CYGNUM_KERNEL_THREADS_DATA_MAX; i++ ) | |
| 219 thread_data[i] = 0; | |
| 220 #endif | |
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221 #ifdef CYGSEM_KERNEL_THREADS_DESTRUCTORS_PER_THREAD |
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222 for (int j=0; j<CYGNUM_KERNEL_THREADS_DESTRUCTORS; j++) { |
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223 destructors[j].fn = NULL; |
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224 } |
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225 #endif |
| 0 | 226 #ifdef CYGVAR_KERNEL_THREADS_NAME |
| 227 name = name_arg; | |
| 228 #endif | |
| 229 #ifdef CYGVAR_KERNEL_THREADS_LIST | |
| 230 // Add thread to housekeeping list | |
| 231 add_to_list(); | |
| 232 #endif | |
| 233 | |
| 234 Cyg_Scheduler::scheduler.register_thread(this); | |
| 235 | |
| 236 init_context(this); | |
| 237 | |
| 238 CYG_REPORT_RETURN(); | |
| 239 } | |
| 240 | |
| 241 | |
| 242 // ------------------------------------------------------------------------- | |
| 243 // Re-initialize this thread. | |
| 244 // We do this by re-invoking the constructor with the original | |
| 245 // arguments, which are still available in the object. | |
| 246 | |
| 247 void | |
| 248 Cyg_Thread::reinitialize() | |
| 249 { | |
| 250 CYG_REPORT_FUNCTION(); | |
| 251 | |
| 252 CYG_ASSERTCLASS( this, "Bad thread"); | |
| 253 CYG_ASSERT( this != Cyg_Scheduler::get_current_thread(), | |
| 254 "Attempt to reinitialize current thread"); | |
| 255 CYG_ASSERT( get_current_queue() == NULL , "Thread is still on a queue"); | |
| 256 | |
| 257 #ifdef CYGFUN_KERNEL_THREADS_TIMER | |
| 258 // Clear the timeout. It is irrelevant whether there was | |
| 259 // actually a timeout pending. | |
| 260 timer.disable(); | |
| 261 #endif | |
| 262 | |
| 263 // Ensure the scheduler has let go of us. | |
| 264 Cyg_Scheduler::scheduler.deregister_thread(this); | |
| 265 | |
| 266 cyg_priority pri = get_priority(); | |
| 267 #ifdef CYGVAR_KERNEL_THREADS_NAME | |
| 268 char * name_arg = name; | |
| 269 #else | |
| 270 char * name_arg = NULL; | |
| 271 #endif | |
| 272 | |
| 273 new(this) Cyg_Thread( pri, | |
| 274 entry_point, entry_data, | |
| 275 name_arg, | |
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276 get_stack_base(), get_stack_size() ); |
| 0 | 277 // the constructor re-registers the thread with the scheduler. |
| 278 | |
| 279 CYG_ASSERTCLASS( this, "Thread corrupted by reinitialize"); | |
| 280 | |
| 281 CYG_REPORT_RETURN(); | |
| 282 } | |
| 283 | |
| 284 // ------------------------------------------------------------------------- | |
| 285 // Destructor. | |
| 286 | |
| 287 Cyg_Thread::~Cyg_Thread() | |
| 288 { | |
| 289 CYG_REPORT_FUNCTION(); | |
| 290 | |
| 291 Cyg_Scheduler::scheduler.deregister_thread(this); | |
| 292 | |
| 293 #ifdef CYGVAR_KERNEL_THREADS_LIST | |
| 294 // Remove thread from housekeeping list. | |
| 295 remove_from_list(); | |
| 296 #endif | |
| 297 | |
| 460 | 298 // Zero the unique_id to render this thread inconsistent. |
| 299 unique_id = 0; | |
| 300 | |
| 0 | 301 CYG_REPORT_RETURN(); |
| 302 } | |
| 303 | |
| 304 // ------------------------------------------------------------------------- | |
| 305 // Thread consistency checker. | |
| 306 | |
| 307 #ifdef CYGDBG_USE_ASSERTS | |
| 308 | |
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309 cyg_bool |
| 2 | 310 Cyg_Thread::check_this( cyg_assert_class_zeal zeal) const |
| 0 | 311 { |
| 312 // CYG_REPORT_FUNCTION(); | |
| 313 | |
| 314 // check that we have a non-NULL pointer first | |
| 315 if( this == NULL ) return false; | |
| 316 | |
| 317 switch( zeal ) | |
| 318 { | |
| 319 case cyg_system_test: | |
| 320 case cyg_extreme: | |
| 321 case cyg_thorough: | |
| 322 if( (state & SUSPENDED) && (suspend_count == 0) ) return false; | |
| 323 case cyg_quick: | |
| 2 | 324 // Check that the stackpointer is within its limits. |
| 325 // Note: This does not check the current stackpointer value | |
| 326 // of the executing thread. | |
| 327 if( (stack_ptr > (stack_base + stack_size)) || | |
| 328 (stack_ptr < stack_base) ) return false; | |
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329 #ifdef CYGFUN_KERNEL_THREADS_STACK_LIMIT |
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330 if( stack_ptr < stack_limit ) return false; |
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331 #endif |
| 0 | 332 case cyg_trivial: |
| 333 case cyg_none: | |
| 334 default: | |
| 335 break; | |
| 336 }; | |
| 337 | |
| 338 return true; | |
| 339 } | |
| 340 | |
| 341 #endif | |
| 342 | |
| 343 // ------------------------------------------------------------------------- | |
| 344 // Put the thread to sleep. | |
| 345 // This can only be called by the current thread on itself, hence | |
| 346 // it is a static function. | |
| 347 | |
| 348 void | |
| 349 Cyg_Thread::sleep() | |
| 350 { | |
| 351 CYG_REPORT_FUNCTION(); | |
| 352 | |
| 353 Cyg_Thread *current = Cyg_Scheduler::get_current_thread(); | |
| 354 | |
| 355 CYG_ASSERTCLASS( current, "Bad current thread" ); | |
| 356 | |
| 357 CYG_INSTRUMENT_THREAD(SLEEP,current,0); | |
| 358 | |
| 359 // Prevent preemption | |
| 360 Cyg_Scheduler::lock(); | |
| 361 | |
| 362 // If running, remove from run qs | |
| 363 if ( current->state == RUNNING ) | |
| 364 Cyg_Scheduler::scheduler.rem_thread(current); | |
| 365 | |
| 366 // Set the state | |
| 367 current->state |= SLEEPING; | |
| 368 | |
| 369 // Unlock the scheduler and switch threads | |
| 370 Cyg_Scheduler::unlock(); | |
| 371 | |
| 372 CYG_REPORT_RETURN(); | |
| 373 } | |
| 374 | |
| 375 // ------------------------------------------------------------------------- | |
| 376 // Awaken the thread from sleep. | |
| 377 | |
| 378 void | |
| 379 Cyg_Thread::wake() | |
| 380 { | |
| 381 CYG_REPORT_FUNCTION(); | |
| 382 | |
| 383 CYG_INSTRUMENT_THREAD(WAKE,this,Cyg_Scheduler::current_thread); | |
| 384 | |
| 385 // Prevent preemption | |
| 386 Cyg_Scheduler::lock(); | |
| 387 | |
| 388 if( 0 != (state & SLEEPSET) ) | |
| 389 { | |
| 390 // Set the state | |
| 391 state &= ~SLEEPSET; | |
| 392 | |
| 393 // remove from any queue we were on | |
| 394 remove(); | |
| 395 | |
| 396 // If the thread is now runnable, return it to run queue | |
| 397 if( state == RUNNING ) | |
| 398 Cyg_Scheduler::scheduler.add_thread(this); | |
| 399 | |
| 400 } | |
| 401 | |
| 402 // Unlock the scheduler and maybe switch threads | |
| 403 Cyg_Scheduler::unlock(); | |
| 404 | |
| 405 CYG_REPORT_RETURN(); | |
| 406 } | |
| 407 | |
| 408 // ------------------------------------------------------------------------- | |
| 409 // Put the thread to sleep, with wakeup count. | |
| 410 // This can only be called by the current thread on itself, hence | |
| 411 // it is a static function. | |
| 412 | |
| 413 void | |
| 414 Cyg_Thread::counted_sleep() | |
| 415 { | |
| 416 CYG_REPORT_FUNCTION(); | |
| 417 | |
| 418 Cyg_Thread *current = Cyg_Scheduler::get_current_thread(); | |
| 419 | |
| 420 CYG_ASSERTCLASS( current, "Bad current thread" ); | |
| 421 | |
| 422 CYG_INSTRUMENT_THREAD(SLEEP,current,0); | |
| 423 | |
| 424 // Prevent preemption | |
| 425 Cyg_Scheduler::lock(); | |
| 426 | |
| 427 if ( 0 == current->wakeup_count ) { | |
| 428 set_sleep_reason( Cyg_Thread::WAIT ); | |
| 429 current->sleep(); // prepare to sleep | |
| 430 current->state |= COUNTSLEEP; // Set the state | |
| 431 } | |
| 432 else | |
| 433 // there is a queued wakeup, do not sleep | |
| 434 current->wakeup_count--; | |
| 435 | |
| 436 // Unlock the scheduler and switch threads | |
| 437 Cyg_Scheduler::unlock(); | |
| 438 | |
| 439 // and deal with anything we must do when we return | |
| 440 switch( current->wake_reason ) { | |
| 441 case DESTRUCT: | |
| 442 case EXIT: | |
| 443 current->exit(); | |
| 444 break; | |
| 445 | |
| 446 default: | |
| 447 break; | |
| 448 } | |
| 449 | |
| 450 CYG_REPORT_RETURN(); | |
| 451 } | |
| 452 | |
| 453 // ------------------------------------------------------------------------- | |
| 454 // Put the thread to sleep for a delay, with wakeup count. | |
| 455 // This can only be called by the current thread on itself, hence | |
| 456 // it is a static function. | |
| 457 | |
| 458 #ifdef CYGFUN_KERNEL_THREADS_TIMER | |
| 459 void | |
| 460 Cyg_Thread::counted_sleep( cyg_tick_count delay ) | |
| 461 { | |
| 462 CYG_REPORT_FUNCTION(); | |
| 463 | |
| 464 Cyg_Thread *current = Cyg_Scheduler::get_current_thread(); | |
| 465 | |
| 466 CYG_ASSERTCLASS( current, "Bad current thread" ); | |
| 467 | |
| 468 CYG_INSTRUMENT_THREAD(SLEEP,current,0); | |
| 469 | |
| 470 // Prevent preemption | |
| 471 Cyg_Scheduler::lock(); | |
| 472 | |
| 473 if ( 0 == current->wakeup_count ) { | |
| 474 | |
| 475 // Set the timer (once outside any waiting loop.) | |
| 476 set_timer( Cyg_Clock::real_time_clock->current_value()+delay, | |
| 477 Cyg_Thread::TIMEOUT ); | |
| 478 | |
| 479 // If the timeout is in the past, the wake reason will have been | |
| 480 // set to something other than NONE already. | |
| 481 | |
| 482 if( current->get_wake_reason() == Cyg_Thread::NONE ) | |
| 483 { | |
| 484 set_sleep_reason( Cyg_Thread::TIMEOUT ); | |
| 485 current->sleep(); // prepare to sleep | |
| 486 current->state |= COUNTSLEEP; // Set the state | |
| 487 | |
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488 Cyg_Scheduler::reschedule(); |
| 0 | 489 |
| 490 // clear the timer; if it actually fired, no worries. | |
| 491 clear_timer(); | |
| 492 } | |
| 493 } | |
| 494 else | |
| 495 // there is a queued wakeup, do not sleep | |
| 496 current->wakeup_count--; | |
| 497 | |
| 498 // Unlock the scheduler and switch threads | |
| 499 Cyg_Scheduler::unlock(); | |
| 500 | |
| 501 // and deal with anything we must do when we return | |
| 502 switch( current->wake_reason ) { | |
| 503 case DESTRUCT: | |
| 504 case EXIT: | |
| 505 current->exit(); | |
| 506 break; | |
| 507 | |
| 508 default: | |
| 509 break; | |
| 510 } | |
| 511 | |
| 512 CYG_REPORT_RETURN(); | |
| 513 } | |
| 514 #endif | |
| 515 | |
| 516 // ------------------------------------------------------------------------- | |
| 517 // Awaken the thread from sleep. | |
| 518 | |
| 519 void | |
| 520 Cyg_Thread::counted_wake() | |
| 521 { | |
| 522 CYG_REPORT_FUNCTION(); | |
| 523 | |
| 524 CYG_INSTRUMENT_THREAD(WAKE,this,Cyg_Scheduler::current_thread); | |
| 525 | |
| 526 // Prevent preemption | |
| 527 Cyg_Scheduler::lock(); | |
| 528 | |
| 529 if ( 0 == (state & COUNTSLEEP) ) // already awake, or waiting: | |
| 530 wakeup_count++; // not in a counted sleep anyway. | |
| 531 else { | |
| 532 sleep_reason = NONE; | |
| 533 wake_reason = DONE; | |
| 534 wake(); // and awaken the thread | |
| 535 } | |
| 536 | |
| 537 #ifdef CYGNUM_KERNEL_MAX_COUNTED_WAKE_COUNT_ASSERT | |
| 538 CYG_ASSERT( CYGNUM_KERNEL_MAX_COUNTED_WAKE_COUNT_ASSERT > wakeup_count, | |
| 539 "wakeup_count overflow" ); | |
| 540 #endif | |
| 541 | |
| 542 // Unlock the scheduler and maybe switch threads | |
| 543 Cyg_Scheduler::unlock(); | |
| 544 | |
| 545 CYG_REPORT_RETURN(); | |
| 546 } | |
| 547 | |
| 548 // ------------------------------------------------------------------------- | |
| 549 // Cancel wakeups for this thread and return how many were pending | |
| 550 cyg_uint32 | |
| 551 Cyg_Thread::cancel_counted_wake() | |
| 552 { | |
| 553 CYG_REPORT_FUNCTION(); | |
| 554 | |
| 555 CYG_INSTRUMENT_THREAD(WAKE,this,Cyg_Scheduler::current_thread); | |
| 556 | |
| 557 // Prevent preemption | |
| 558 Cyg_Scheduler::lock(); | |
| 559 | |
| 560 cyg_uint32 result = wakeup_count; | |
| 561 wakeup_count = 0; | |
| 562 | |
| 563 // Unlock the scheduler | |
| 564 Cyg_Scheduler::unlock(); | |
| 565 | |
| 566 CYG_REPORT_RETVAL( result ); | |
| 567 return result; | |
| 568 } | |
| 569 | |
| 570 // ------------------------------------------------------------------------- | |
| 571 // Suspend thread. Increment suspend count and deschedule thread | |
| 572 // if still running. | |
| 573 | |
| 574 void | |
| 575 Cyg_Thread::suspend() | |
| 576 { | |
| 577 CYG_REPORT_FUNCTION(); | |
| 578 | |
| 579 CYG_INSTRUMENT_THREAD(SUSPEND,this,Cyg_Scheduler::current_thread); | |
| 580 | |
| 581 // Prevent preemption | |
| 582 Cyg_Scheduler::lock(); | |
| 583 | |
| 584 suspend_count++; | |
| 585 | |
| 586 #ifdef CYGNUM_KERNEL_MAX_SUSPEND_COUNT_ASSERT | |
| 587 CYG_ASSERT( CYGNUM_KERNEL_MAX_SUSPEND_COUNT_ASSERT > suspend_count, | |
| 588 "suspend_count overflow" ); | |
| 589 #endif | |
| 590 | |
| 591 // If running, remove from run qs | |
| 592 if( state == RUNNING ) | |
| 593 Cyg_Scheduler::scheduler.rem_thread(this); | |
| 594 | |
| 595 // Set the state | |
| 596 state |= SUSPENDED; | |
| 597 | |
| 598 // Unlock the scheduler and maybe switch threads | |
| 599 Cyg_Scheduler::unlock(); | |
| 600 | |
| 601 CYG_REPORT_RETURN(); | |
| 602 } | |
| 603 | |
| 604 // ------------------------------------------------------------------------- | |
| 605 // Resume thread. Decrement suspend count and reschedule if it | |
| 606 // is zero. | |
| 607 | |
| 608 void | |
| 609 Cyg_Thread::resume() | |
| 610 { | |
| 611 CYG_REPORT_FUNCTION(); | |
| 612 | |
| 613 CYG_INSTRUMENT_THREAD(RESUME,this,Cyg_Scheduler::current_thread); | |
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614 |
| 0 | 615 // Prevent preemption |
| 616 Cyg_Scheduler::lock(); | |
| 617 | |
| 618 // If we are about to zero the count, clear the state bit and | |
| 619 // reschedule the thread if possible. | |
| 620 | |
| 621 if( suspend_count == 1 ) | |
| 622 { | |
| 623 suspend_count = 0; | |
| 624 | |
| 625 CYG_ASSERT( (state & SUSPENDED) != 0, "SUSPENDED bit not set" ); | |
| 626 | |
| 627 // Set the state | |
| 628 state &= ~SUSPENDED; | |
| 629 | |
| 630 // Return thread to scheduler if runnable | |
| 631 if( state == RUNNING ) | |
| 632 Cyg_Scheduler::scheduler.add_thread(this); | |
| 633 } | |
| 634 else | |
| 635 if( suspend_count > 0 ) | |
| 636 suspend_count--; | |
| 637 // else ignore attempt to resume | |
| 638 | |
| 639 // Unlock the scheduler and maybe switch threads | |
| 640 Cyg_Scheduler::unlock(); | |
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641 |
| 0 | 642 CYG_REPORT_RETURN(); |
| 643 } | |
| 644 | |
| 645 // ------------------------------------------------------------------------- | |
| 646 // Forced Resume thread. Zero suspend count and reschedule... | |
| 647 | |
| 648 void | |
| 649 Cyg_Thread::force_resume() | |
| 650 { | |
| 651 CYG_REPORT_FUNCTION(); | |
| 652 | |
| 653 CYG_INSTRUMENT_THREAD(RESUME,this,Cyg_Scheduler::current_thread); | |
| 654 | |
| 655 // Prevent preemption | |
| 656 Cyg_Scheduler::lock(); | |
| 657 | |
| 658 // If we are about to zero the count, clear the state bit and | |
| 659 // reschedule the thread if possible. | |
| 660 | |
| 661 if ( 0 < suspend_count ) { | |
| 662 suspend_count = 0; | |
| 663 | |
| 664 CYG_ASSERT( (state & SUSPENDED) != 0, "SUSPENDED bit not set" ); | |
| 665 | |
| 666 // Set the state | |
| 667 state &= ~SUSPENDED; | |
| 668 | |
| 669 // Return thread to scheduler if runnable | |
| 670 if( state == RUNNING ) | |
| 671 Cyg_Scheduler::scheduler.add_thread(this); | |
| 672 } | |
| 673 | |
| 674 // Unlock the scheduler and maybe switch threads | |
| 675 Cyg_Scheduler::unlock(); | |
| 676 CYG_REPORT_RETURN(); | |
| 677 } | |
| 678 | |
| 679 // ------------------------------------------------------------------------- | |
| 680 // Force thread to wake up from a sleep with a wake_reason of | |
| 681 // BREAK. It is the responsibility of the woken thread to detect | |
| 682 // the release() and do the right thing. | |
| 683 | |
| 684 void | |
| 685 Cyg_Thread::release() | |
| 686 { | |
| 687 CYG_REPORT_FUNCTION(); | |
| 688 // Prevent preemption | |
| 689 Cyg_Scheduler::lock(); | |
| 690 | |
| 691 // If the thread is in any of the sleep states, set the | |
| 692 // wake reason and wake it up. | |
| 693 | |
| 694 switch( sleep_reason ) | |
| 695 { | |
| 696 | |
| 697 case NONE: | |
| 698 // The thread is not sleeping for any reason, do nothing. | |
| 699 // drop through... | |
| 700 | |
| 701 case DESTRUCT: | |
| 702 case BREAK: | |
| 703 case EXIT: | |
| 704 case DONE: | |
| 705 // Do nothing in any of these cases. They are here to | |
| 706 // keep the compiler happy. | |
| 707 | |
| 708 Cyg_Scheduler::unlock(); | |
| 709 CYG_REPORT_RETURN(); | |
| 710 return; | |
| 711 | |
| 712 case WAIT: | |
| 713 // The thread was waiting for some sync object to do | |
| 714 // something. | |
| 715 // drop through... | |
| 716 | |
| 717 case TIMEOUT: | |
| 718 // The thread was waiting on a sync object with a timeout. | |
| 719 // drop through... | |
| 720 | |
| 721 case DELAY: | |
| 722 // The thread was simply delaying, unless it has been | |
| 723 // woken up for some other reason, wake it now. | |
| 724 sleep_reason = NONE; | |
| 725 wake_reason = BREAK; | |
| 726 break; | |
| 727 } | |
| 728 | |
| 729 wake(); | |
| 730 | |
| 731 // Allow preemption | |
| 732 Cyg_Scheduler::unlock(); | |
| 733 | |
| 734 CYG_REPORT_RETURN(); | |
| 735 } | |
| 736 | |
| 737 // ------------------------------------------------------------------------- | |
| 738 // Exit thread. This puts the thread into EXITED state. | |
| 739 | |
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740 #ifdef CYGPKG_KERNEL_THREADS_DESTRUCTORS |
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741 #ifndef CYGSEM_KERNEL_THREADS_DESTRUCTORS_PER_THREAD |
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742 Cyg_Thread::Cyg_Destructor_Entry |
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743 Cyg_Thread::destructors[ CYGNUM_KERNEL_THREADS_DESTRUCTORS ]; |
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744 #endif |
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745 #endif |
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746 |
| 0 | 747 void |
| 748 Cyg_Thread::exit() | |
| 749 { | |
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750 CYG_REPORT_FUNCTION(); |
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751 |
| 0 | 752 // The thread should never return from this function. |
| 753 | |
| 754 Cyg_Thread *self = Cyg_Thread::self(); | |
| 755 | |
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756 #ifdef CYGPKG_KERNEL_THREADS_DESTRUCTORS |
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757 cyg_ucount16 i; |
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758 for (i=0; i<CYGNUM_KERNEL_THREADS_DESTRUCTORS; i++) { |
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759 if (NULL != self->destructors[i].fn) { |
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760 destructor_fn fn = self->destructors[i].fn; |
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761 CYG_ADDRWORD data = self->destructors[i].data; |
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762 fn(data); |
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763 } |
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764 } |
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765 #endif |
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766 #ifdef CYGDBG_KERNEL_THREADS_STACK_MEASUREMENT_VERBOSE_EXIT |
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767 diag_printf( "Stack usage for thread %08x: %d\n", self, |
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768 self->measure_stack_usage() ); |
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769 #endif |
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770 |
| 0 | 771 Cyg_Scheduler::lock(); |
| 772 | |
| 773 // clear the timer; if there was none, no worries. | |
| 774 clear_timer(); | |
| 775 | |
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776 // It is possible that we have already been killed by another |
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777 // thread, in which case we do not want to try and take ourself |
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778 // out of the scheduler again. |
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779 if( self->state != EXITED ) |
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780 { |
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781 self->state = EXITED; |
| 0 | 782 |
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783 Cyg_Scheduler::scheduler.rem_thread(self); |
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784 } |
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785 |
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786 Cyg_Scheduler::reschedule(); |
| 0 | 787 } |
| 788 | |
| 789 // ------------------------------------------------------------------------- | |
| 790 // Kill thread. Force the thread into EXITED state externally, or | |
| 791 // make it wake up and call exit(). | |
| 792 | |
| 793 void | |
| 794 Cyg_Thread::kill() | |
| 795 { | |
| 796 CYG_REPORT_FUNCTION(); | |
| 797 // If this is called by the current thread on itself, | |
| 798 // just call exit(), which is what he should have done | |
| 799 // in the first place. | |
| 800 if( this == Cyg_Scheduler::get_current_thread() ) | |
| 801 exit(); | |
| 802 | |
| 803 // Prevent preemption | |
| 804 Cyg_Scheduler::lock(); | |
| 805 | |
| 806 // We are killing someone else. Find out what state he is | |
| 807 // in and force him to wakeup and call exit(). | |
| 808 | |
| 809 force_resume(); // this is necessary for when | |
| 810 // he is asleep AND suspended. | |
| 811 #ifdef CYGFUN_KERNEL_THREADS_TIMER | |
| 812 timer.disable(); // and make sure the timer | |
| 813 // does not persist. | |
| 814 #endif | |
| 815 | |
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816 if ( EXIT != wake_reason ) switch( sleep_reason ) { |
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817 // Only do any of this if the thread is not in pending death already: |
| 0 | 818 |
| 819 case NONE: | |
| 820 // The thread is not sleeping for any reason, it must be | |
| 821 // on a run queue. | |
| 822 // We can safely deschedule and set its state. | |
| 823 if( state == RUNNING ) Cyg_Scheduler::scheduler.rem_thread(this); | |
| 824 state = EXITED; | |
| 825 break; | |
| 826 | |
| 827 case DESTRUCT: | |
| 828 case BREAK: | |
| 829 case EXIT: | |
| 830 case DONE: | |
| 831 // Do nothing in any of these cases. They are here to | |
| 832 // keep the compiler happy. | |
| 833 | |
| 834 Cyg_Scheduler::unlock(); | |
| 835 CYG_REPORT_RETURN(); | |
| 836 return; | |
| 837 | |
| 838 case WAIT: | |
| 839 // The thread was waiting for some sync object to do | |
| 840 // something. | |
| 841 // drop through... | |
| 842 | |
| 843 case TIMEOUT: | |
| 844 // The thread was waiting on a sync object with a timeout. | |
| 845 // drop through... | |
| 846 | |
| 847 case DELAY: | |
| 848 // The thread was simply delaying, unless it has been | |
| 849 // woken up for some other reason, wake it now. | |
| 850 sleep_reason = NONE; | |
| 851 wake_reason = EXIT; | |
| 852 break; | |
| 853 } | |
| 854 | |
| 855 wake(); | |
| 856 | |
| 857 // Allow preemption | |
| 858 Cyg_Scheduler::unlock(); | |
| 859 CYG_REPORT_RETURN(); | |
| 860 } | |
| 861 | |
| 862 // ------------------------------------------------------------------------- | |
| 863 // Set thread priority | |
| 864 | |
| 865 #ifdef CYGIMP_THREAD_PRIORITY | |
| 866 | |
| 867 void | |
| 868 Cyg_Thread::set_priority( cyg_priority new_priority ) | |
| 869 { | |
| 870 CYG_REPORT_FUNCTION(); | |
| 871 | |
| 872 // CYG_ASSERT( new_priority >= CYG_THREAD_MAX_PRIORITY, "Priority out of range"); | |
| 873 // CYG_ASSERT( new_priority <= CYG_THREAD_MIN_PRIORITY, "Priority out of range"); | |
| 874 | |
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875 CYG_INSTRUMENT_THREAD(PRIORITY,this,new_priority); |
| 0 | 876 |
| 877 // Prevent preemption | |
| 878 Cyg_Scheduler::lock(); | |
| 879 | |
| 880 Cyg_ThreadQueue *queue = NULL; | |
| 881 | |
| 882 // If running, remove from run qs | |
| 883 if( state == RUNNING ) | |
| 884 Cyg_Scheduler::scheduler.rem_thread(this); | |
| 885 else if( state & SLEEPING ) | |
| 886 { | |
| 887 // Remove thread from current queue. | |
| 888 queue = get_current_queue(); | |
| 889 // if indeed we are on a queue | |
| 890 if ( NULL != queue ) { | |
| 891 CYG_CHECK_DATA_PTR(queue, "Bad queue pointer"); | |
| 892 remove(); | |
| 893 } | |
| 894 } | |
| 895 | |
| 896 Cyg_Scheduler::scheduler.deregister_thread(this); | |
| 897 | |
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898 #if CYGINT_KERNEL_SCHEDULER_UNIQUE_PRIORITIES |
| 0 | 899 |
| 900 // Check that there are no other threads at this priority. | |
| 901 // If so, leave is as it is. | |
| 902 | |
| 903 CYG_ASSERT( Cyg_Scheduler::scheduler.unique(new_priority), "Priority not unique"); | |
| 904 | |
| 905 if( Cyg_Scheduler::scheduler.unique(new_priority) ) | |
| 906 priority = new_priority; | |
| 907 | |
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908 #else // !CYGINT_KERNEL_SCHEDULER_UNIQUE_PRIORITIES |
| 0 | 909 |
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910 #ifdef CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_SIMPLE |
| 0 | 911 |
| 912 // When we have priority inheritance, we must update the original | |
| 913 // priority and not the inherited one. If the new priority is | |
| 914 // better than the current inherited one, then use that | |
| 915 // immediately. We remain in inherited state to avoid problems | |
| 916 // with multiple mutex inheritances. | |
| 917 | |
| 918 if( priority_inherited ) | |
| 919 { | |
| 920 original_priority = new_priority; | |
| 921 if( priority > new_priority ) priority = new_priority; | |
| 922 } | |
| 923 else priority = new_priority; | |
| 924 | |
| 925 #else | |
| 926 | |
| 927 priority = new_priority; | |
| 928 | |
| 929 #endif | |
| 930 | |
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931 #endif // CYGINT_KERNEL_SCHEDULER_UNIQUE_PRIORITIES |
| 0 | 932 |
| 933 Cyg_Scheduler::scheduler.register_thread(this); | |
| 934 | |
| 935 // Return thread to scheduler if runnable | |
| 936 if( state == RUNNING ) | |
| 937 Cyg_Scheduler::scheduler.add_thread(this); | |
| 938 else if ( state & SLEEPING ) | |
| 939 { | |
| 940 // return to current queue | |
| 941 // if indeed we are on a queue | |
| 942 if ( NULL != queue ) { | |
| 943 CYG_CHECK_DATA_PTR(queue, "Bad queue pointer"); | |
| 944 queue->enqueue(this); | |
| 945 } | |
| 946 } | |
| 947 | |
| 948 // If the current thread is being reprioritized, set the | |
| 949 // reschedule flag to ensure that it gets rescheduled if | |
| 950 // necessary. (Strictly we only need to do this if the new | |
| 951 // priority is less than that of some other runnable thread, in | |
| 952 // practice checking that is as expensive as what the scheduler | |
| 953 // will do anyway). | |
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954 // If it is not the current thread then we need to see whether |
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955 // it is more worthy of execution than any current thread and |
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956 // rescheduled if necessary. |
| 0 | 957 |
| 958 if( this == Cyg_Scheduler::get_current_thread() ) | |
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959 Cyg_Scheduler::set_need_reschedule(); |
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960 else Cyg_Scheduler::set_need_reschedule(this); |
| 0 | 961 |
| 962 // Unlock the scheduler and maybe switch threads | |
| 963 Cyg_Scheduler::unlock(); | |
| 964 CYG_REPORT_RETURN(); | |
| 965 } | |
| 966 | |
| 967 #endif | |
| 968 | |
| 969 | |
| 970 // ------------------------------------------------------------------------- | |
| 971 // Thread delay function | |
| 972 | |
| 973 void | |
| 974 Cyg_Thread::delay( cyg_tick_count delay) | |
| 975 { | |
| 976 CYG_REPORT_FUNCTION(); | |
| 977 | |
| 2 | 978 #ifdef CYGFUN_KERNEL_THREADS_TIMER |
| 0 | 979 |
| 980 CYG_INSTRUMENT_THREAD(DELAY,this,delay); | |
| 981 | |
| 982 // Prevent preemption | |
| 983 Cyg_Scheduler::lock(); | |
| 984 | |
| 985 sleep(); | |
| 986 | |
| 987 set_timer( Cyg_Clock::real_time_clock->current_value()+delay, DELAY ); | |
| 988 | |
| 989 // Unlock the scheduler and maybe switch threads | |
| 990 Cyg_Scheduler::unlock(); | |
| 991 | |
| 992 // Clear the timeout. It is irrelevant whether the alarm has | |
| 993 // actually gone off or not. | |
| 994 clear_timer(); | |
| 995 | |
| 996 // and deal with anything else we must do when we return | |
| 997 switch( wake_reason ) { | |
| 998 case DESTRUCT: | |
| 999 case EXIT: | |
| 1000 exit(); | |
| 1001 break; | |
| 1002 | |
| 1003 default: | |
| 1004 break; | |
| 1005 } | |
| 1006 #endif | |
| 1007 CYG_REPORT_RETURN(); | |
| 1008 } | |
| 1009 | |
| 1010 // ------------------------------------------------------------------------- | |
| 1011 // | |
| 1012 | |
| 1013 #ifdef CYGPKG_KERNEL_EXCEPTIONS | |
| 1014 | |
| 1015 void | |
| 1016 Cyg_Thread::deliver_exception( | |
| 1017 cyg_code exception_number, // exception being raised | |
| 1018 CYG_ADDRWORD exception_info // exception specific info | |
| 1019 ) | |
| 1020 { | |
| 1021 if( this == Cyg_Scheduler::get_current_thread() ) | |
| 1022 { | |
| 1023 // Delivering to current thread, probably as a result | |
| 1024 // of a real hardware exception. Simply invoke the appropriate | |
| 1025 // handler. | |
| 1026 | |
| 1027 exception_control.deliver_exception( exception_number, exception_info ); | |
| 1028 } | |
| 1029 #ifdef CYGIMP_EXCEPTION_ASYNC | |
| 1030 else | |
| 1031 { | |
| 1032 // Delivering to another thread, probably as a result of one thread | |
| 1033 // invoking this function on another thread. Adjust the other thread's | |
| 1034 // state to make it execute the exception routine when it next runs. | |
| 1035 | |
| 1036 // At present there is an unresolved problem here. We do not know what | |
| 1037 // state the destination thread is in. It may not be a suitable point at | |
| 1038 // which to invoke an exception routine. In most cases the exception | |
| 1039 // routine will be run in the scheduler thread switch code, where the world is | |
| 1040 // in an inconsistent state. We really need to run the routine at the | |
| 1041 // end of unlock_inner(). However this would add extra code to the scheduler, | |
| 1042 // and require a way of storing pending exceptions. So for now this option is | |
| 1043 // disabled and not yet implemented, it may never be. | |
| 1044 | |
| 1045 } | |
| 1046 #endif | |
| 1047 } | |
| 1048 | |
| 1049 #endif | |
| 1050 | |
| 1051 // ------------------------------------------------------------------------- | |
| 1052 // Per-thread data support | |
| 1053 | |
| 1054 #ifdef CYGVAR_KERNEL_THREADS_DATA | |
| 1055 | |
| 1056 // Set the data map bits for each free slot in the data array. | |
| 1057 cyg_ucount32 Cyg_Thread::thread_data_map = (~CYGNUM_KERNEL_THREADS_DATA_ALL) & | |
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1058 (1+(((cyg_ucount32)(1<<(CYGNUM_KERNEL_THREADS_DATA_MAX-1))-1)<<1)); |
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1059 // the second expression is equivalent to ((1<<CYGNUM_KERNEL_THREADS_DATA_MAX)-1); |
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1060 // but avoids overflow. The compiler will compile to a constant just fine. |
| 0 | 1061 |
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1062 Cyg_Thread::cyg_data_index |
| 0 | 1063 Cyg_Thread::new_data_index() |
| 1064 { | |
| 1065 Cyg_Scheduler::lock(); | |
| 1066 | |
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1067 Cyg_Thread::cyg_data_index index; |
| 0 | 1068 |
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1069 if (0 == thread_data_map) |
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1070 return -1; |
| 0 | 1071 |
| 1072 // find ls set bit | |
| 1073 HAL_LSBIT_INDEX( index, thread_data_map ); | |
| 1074 | |
| 1075 // clear the bit | |
| 1076 thread_data_map &= ~(1<<index); | |
| 1077 | |
| 1078 Cyg_Scheduler::unlock(); | |
| 1079 | |
| 1080 return index; | |
| 1081 } | |
| 1082 | |
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1083 void Cyg_Thread::free_data_index( Cyg_Thread::cyg_data_index index ) |
| 0 | 1084 { |
| 1085 Cyg_Scheduler::lock(); | |
| 1086 | |
| 1087 thread_data_map |= (1<<index); | |
| 1088 | |
| 1089 Cyg_Scheduler::unlock(); | |
| 1090 } | |
| 1091 | |
| 1092 | |
| 1093 #endif | |
| 1094 | |
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1095 // ------------------------------------------------------------------------- |
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1096 // Allocate some memory at the lower end of the stack |
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1097 // by moving the stack limit pointer. |
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1098 |
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1099 #if defined(CYGFUN_KERNEL_THREADS_STACK_LIMIT) && \ |
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1100 defined(CYGFUN_KERNEL_THREADS_STACK_CHECKING) |
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1101 // if not doing stack checking, implementation can be found in thread.inl |
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1102 // This implementation puts the magic buffer area (to watch for overruns |
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1103 // *above* the stack limit, i.e. there is no official demarcation between |
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1104 // the stack and the buffer. But that's okay if you think about it... having |
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1105 // a demarcation would not accomplish anything more. |
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1106 void *Cyg_HardwareThread::increment_stack_limit( cyg_ucount32 size ) |
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1107 { |
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1108 void *ret = (void *)stack_limit; |
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1109 |
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1110 // First lock the scheduler because we're going to be tinkering with |
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1111 // the check data |
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1112 Cyg_Scheduler::lock(); |
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1113 |
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1114 // if we've inc'd the limit before, it will be off by the check data |
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1115 // size, so lets correct it |
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1116 if (stack_limit != stack_base) |
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1117 stack_limit -= CYGNUM_KERNEL_THREADS_STACK_CHECK_DATA_SIZE; |
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1118 stack_limit += size; |
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1119 |
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1120 // determine base of check data by rounding up to nearest word aligned |
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1121 // address if not already aligned |
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1122 cyg_uint32 *p = (cyg_uint32 *)((stack_limit + 3) & ~3); |
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1123 // i.e. + sizeof(cyg_uint32)-1) & ~(sizeof(cyg_uint32)-1); |
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1124 cyg_ucount32 i; |
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1125 cyg_uint32 sig = (cyg_uint32)this; |
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1126 |
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1127 for ( i = 0; |
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1128 i < CYGNUM_KERNEL_THREADS_STACK_CHECK_DATA_SIZE/sizeof(cyg_uint32); |
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1129 i++ ) { |
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1130 p[i] = (sig ^ (i * 0x01010101)); |
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1131 } |
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1132 |
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1133 // increment limit by the check size. Note this will not necessarily |
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1134 // reach the end of the check data. But that doesn't really matter. |
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1135 // Doing this allows better checking of the saved stack pointer in |
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1136 // Cyg_Thread::check_this() |
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1137 stack_limit += CYGNUM_KERNEL_THREADS_STACK_CHECK_DATA_SIZE; |
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1138 |
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1139 Cyg_Scheduler::unlock(); |
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1140 |
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1141 return ret; |
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1142 } |
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1143 #endif |
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1144 |
| 0 | 1145 // ========================================================================= |
| 1146 // Cyg_ThreadTimer member functions | |
| 1147 | |
| 1148 // ------------------------------------------------------------------------- | |
| 1149 // Timer alarm function. Inspect the sleep_reason and if necessary wake | |
| 1150 // up the thread with an appropriate wake_reason. | |
| 1151 | |
| 1152 #ifdef CYGFUN_KERNEL_THREADS_TIMER | |
| 1153 | |
| 1154 void | |
| 1155 Cyg_ThreadTimer::alarm( | |
| 1156 Cyg_Alarm *alarm, | |
| 1157 CYG_ADDRWORD data | |
| 1158 ) | |
| 1159 { | |
| 1160 CYG_REPORT_FUNCTION(); | |
| 1161 | |
| 1162 Cyg_ThreadTimer *self = (Cyg_ThreadTimer *)data; | |
| 1163 Cyg_Thread *thread = self->thread; | |
| 1164 | |
| 1165 CYG_INSTRUMENT_THREAD(ALARM, 0, 0); | |
| 1166 | |
| 1167 Cyg_Scheduler::lock(); | |
| 1168 | |
| 1169 Cyg_Thread::cyg_reason sleep_reason = thread->get_sleep_reason(); | |
| 1170 | |
| 1171 switch( sleep_reason ) { | |
| 1172 | |
| 1173 case Cyg_Thread::DESTRUCT: | |
| 1174 case Cyg_Thread::BREAK: | |
| 1175 case Cyg_Thread::EXIT: | |
| 1176 case Cyg_Thread::NONE: | |
| 1177 case Cyg_Thread::WAIT: | |
| 1178 case Cyg_Thread::DONE: | |
| 1179 // Do nothing in any of these cases. Most are here to | |
| 1180 // keep the compiler happy. | |
| 1181 Cyg_Scheduler::unlock(); | |
| 1182 CYG_REPORT_RETURN(); | |
| 1183 return; | |
| 1184 | |
| 1185 case Cyg_Thread::DELAY: | |
| 1186 // The thread was simply delaying, unless it has been | |
| 1187 // woken up for some other reason, wake it now. | |
| 1188 thread->set_wake_reason(Cyg_Thread::DONE); | |
| 1189 break; | |
| 1190 | |
| 1191 case Cyg_Thread::TIMEOUT: | |
| 1192 // The thread has timed out, set the wake reason to | |
| 1193 // TIMEOUT and restart. | |
| 1194 thread->set_wake_reason(Cyg_Thread::TIMEOUT); | |
| 1195 break; | |
| 1196 } | |
| 1197 | |
| 1198 thread->wake(); | |
| 1199 | |
| 1200 Cyg_Scheduler::unlock(); | |
| 1201 CYG_REPORT_RETURN(); | |
| 1202 } | |
| 1203 | |
| 1204 #endif | |
| 1205 | |
| 1206 // ========================================================================= | |
| 1207 // The Idle thread | |
| 1208 // The idle thread is implemented as a single instance of the | |
| 1209 // Cyg_IdleThread class. This is so that it can be initialized before | |
| 1210 // main in a static constructor. | |
| 1211 | |
| 1212 // ------------------------------------------------------------------------- | |
| 1213 // Data definitions | |
| 1214 | |
| 1215 // stack | |
| 2 | 1216 #ifdef CYGNUM_HAL_STACK_SIZE_MINIMUM |
| 1217 # ifdef CYGNUM_KERNEL_THREADS_IDLE_STACK_SIZE | |
| 1218 # if CYGNUM_KERNEL_THREADS_IDLE_STACK_SIZE < CYGNUM_HAL_STACK_SIZE_MINIMUM | |
| 0 | 1219 |
| 2 | 1220 // then override the configured stack size |
| 1221 # undef CYGNUM_KERNEL_THREADS_IDLE_STACK_SIZE | |
| 1222 # define CYGNUM_KERNEL_THREADS_IDLE_STACK_SIZE CYGNUM_HAL_STACK_SIZE_MINIMUM | |
| 1223 | |
| 1224 # endif // CYGNUM_KERNEL_THREADS_IDLE_STACK_SIZE < CYGNUM_HAL_STACK_SIZE_MINIMUM | |
| 1225 # endif // CYGNUM_KERNEL_THREADS_IDLE_STACK_SIZE | |
| 1226 #endif // CYGNUM_HAL_STACK_SIZE_MINIMUM | |
| 1227 | |
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1228 static char idle_thread_stack[CYGNUM_KERNEL_CPU_MAX][CYGNUM_KERNEL_THREADS_IDLE_STACK_SIZE]; |
| 0 | 1229 |
| 1230 // Loop counter for debugging/housekeeping | |
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1231 cyg_uint32 idle_thread_loops[CYGNUM_KERNEL_CPU_MAX]; |
| 0 | 1232 |
| 1233 // ------------------------------------------------------------------------- | |
| 1234 // Idle thread code. | |
| 1235 | |
| 1236 void | |
| 1237 idle_thread_main( CYG_ADDRESS data ) | |
| 1238 { | |
| 1239 CYG_REPORT_FUNCTION(); | |
| 1240 | |
| 1241 for(;;) | |
| 1242 { | |
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1243 idle_thread_loops[CYG_KERNEL_CPU_THIS()]++; |
| 0 | 1244 |
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1245 HAL_IDLE_THREAD_ACTION(idle_thread_loops[CYG_KERNEL_CPU_THIS()]); |
| 0 | 1246 |
| 1247 #if 0 | |
| 1248 // For testing, it is useful to be able to fake | |
| 1249 // clock interrupts in the idle thread. | |
| 1250 | |
| 1251 Cyg_Clock::real_time_clock->tick(); | |
| 1252 #endif | |
| 1253 #ifdef CYGIMP_IDLE_THREAD_YIELD | |
| 1254 // In single priority and non-preemptive systems, | |
| 1255 // the idle thread should yield repeatedly to | |
| 1256 // other threads. | |
| 1257 Cyg_Thread::yield(); | |
| 1258 #endif | |
| 1259 } | |
| 1260 } | |
| 1261 | |
| 1262 // ------------------------------------------------------------------------- | |
| 1263 // Idle thread class | |
| 1264 | |
| 1265 class Cyg_IdleThread : public Cyg_Thread | |
| 1266 { | |
| 1267 public: | |
|
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1268 Cyg_IdleThread(); |
| 0 | 1269 |
| 1270 }; | |
| 1271 | |
| 1272 // ------------------------------------------------------------------------- | |
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1273 // Instantiate the idle thread |
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1274 |
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1275 Cyg_IdleThread idle_thread[CYGNUM_KERNEL_CPU_MAX] CYG_INIT_PRIORITY( IDLE_THREAD ); |
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1276 |
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1277 // ------------------------------------------------------------------------- |
| 0 | 1278 // Idle threads constructor |
| 1279 | |
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1280 Cyg_IdleThread::Cyg_IdleThread() |
| 0 | 1281 : Cyg_Thread( CYG_THREAD_MIN_PRIORITY, |
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1282 idle_thread_main, |
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1283 0, |
| 0 | 1284 "Idle Thread", |
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1285 (CYG_ADDRESS)idle_thread_stack[this-&idle_thread[0]], |
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1286 CYGNUM_KERNEL_THREADS_IDLE_STACK_SIZE) |
| 0 | 1287 { |
| 1288 CYG_REPORT_FUNCTION(); | |
| 1289 | |
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1290 // Call into scheduler to set up this thread as the default |
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1291 // current thread for its CPU. |
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1292 |
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1293 Cyg_Scheduler::scheduler.set_idle_thread( this, this-&idle_thread[0] ); |
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1294 |
| 0 | 1295 CYG_REPORT_RETURN(); |
| 1296 } | |
| 1297 | |
| 1298 // ------------------------------------------------------------------------- | |
| 1299 // EOF common/thread.cxx |