Navigation
- Accueil
- Présentation :
- FAQ
- Bugs et errata
- Contributions de lecteurs
- Téléchargements
- LXR (référencement des sources)
- Mailing-list
- Liens et Projets reliés
Site hébergé par :
Site hébergé par :
|
[ source navigation ] [ diff markup ] [ identifier search ] [ general search ] |
|||
|
||||
001 /* Copyright (C) 2004,2005 David Decotigny 001 /* Copyright (C) 2004,2005 David Decotigny 002 002 003 This program is free software; you can redi 003 This program is free software; you can redistribute it and/or 004 modify it under the terms of the GNU Genera 004 modify it under the terms of the GNU General Public License 005 as published by the Free Software Foundatio 005 as published by the Free Software Foundation; either version 2 006 of the License, or (at your option) any lat 006 of the License, or (at your option) any later version. 007 007 008 This program is distributed in the hope tha 008 This program is distributed in the hope that it will be useful, 009 but WITHOUT ANY WARRANTY; without even the 009 but WITHOUT ANY WARRANTY; without even the implied warranty of 010 MERCHANTABILITY or FITNESS FOR A PARTICULAR 010 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 011 GNU General Public License for more details 011 GNU General Public License for more details. 012 012 013 You should have received a copy of the GNU 013 You should have received a copy of the GNU General Public License 014 along with this program; if not, write to t 014 along with this program; if not, write to the Free Software 015 Foundation, Inc., 59 Temple Place - Suite 3 015 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 016 USA. 016 USA. 017 */ 017 */ 018 #ifndef _SOS_THREAD_H_ 018 #ifndef _SOS_THREAD_H_ 019 #define _SOS_THREAD_H_ 019 #define _SOS_THREAD_H_ 020 020 021 /** 021 /** 022 * @file thread.h 022 * @file thread.h 023 * 023 * 024 * SOS Thread management API 024 * SOS Thread management API 025 */ 025 */ 026 026 027 #include <sos/errno.h> 027 #include <sos/errno.h> 028 028 029 /* Forward declaration */ 029 /* Forward declaration */ 030 struct sos_thread; 030 struct sos_thread; 031 031 032 #include <hwcore/cpu_context.h> 032 #include <hwcore/cpu_context.h> 033 #include <sos/sched.h> 033 #include <sos/sched.h> 034 #include <sos/kwaitq.h> 034 #include <sos/kwaitq.h> 035 #include <sos/time.h> 035 #include <sos/time.h> 036 #include <sos/process.h> 036 #include <sos/process.h> 037 #include <sos/umem_vmm.h> 037 #include <sos/umem_vmm.h> 038 038 039 /** 039 /** 040 * The possible states of a valid thread 040 * The possible states of a valid thread 041 */ 041 */ 042 typedef enum { SOS_THR_CREATED, /**< Thread cr 042 typedef enum { SOS_THR_CREATED, /**< Thread created, not fully initialized */ 043 SOS_THR_READY, /**< Thread fu 043 SOS_THR_READY, /**< Thread fully initialized or 044 waiting f 044 waiting for CPU after having been 045 blocked o 045 blocked or preempted */ 046 SOS_THR_RUNNING, /**< Thread cu 046 SOS_THR_RUNNING, /**< Thread currently running on CPU */ 047 SOS_THR_BLOCKED, /**< Thread wa 047 SOS_THR_BLOCKED, /**< Thread waiting for I/O (+ in at LEAST 048 one kwait 048 one kwaitq) and/or sleeping (+ in NO 049 kwaitq) * 049 kwaitq) */ 050 SOS_THR_ZOMBIE, /**< Thread te 050 SOS_THR_ZOMBIE, /**< Thread terminated execution, waiting to 051 be delete 051 be deleted by kernel */ 052 } sos_thread_state_t; 052 } sos_thread_state_t; 053 053 054 054 055 /** 055 /** 056 * TCB (Thread Control Block): structure descr 056 * TCB (Thread Control Block): structure describing a thread. Don't 057 * access these fields directly: prefer using 057 * access these fields directly: prefer using the accessor functions 058 * below. 058 * below. 059 */ 059 */ 060 struct sos_thread 060 struct sos_thread 061 { 061 { 062 #define SOS_THR_MAX_NAMELEN 32 062 #define SOS_THR_MAX_NAMELEN 32 063 char name[SOS_THR_MAX_NAMELEN]; 063 char name[SOS_THR_MAX_NAMELEN]; 064 064 065 sos_thread_state_t state; 065 sos_thread_state_t state; 066 sos_sched_priority_t priority; 066 sos_sched_priority_t priority; 067 067 068 /** 068 /** 069 * The hardware context of the thread. 069 * The hardware context of the thread. 070 * 070 * 071 * It will reflect the CPU state of the thre 071 * It will reflect the CPU state of the thread: 072 * - From an interrupt handler: the state o 072 * - From an interrupt handler: the state of the thread at the time 073 * of the OUTERMOST irq. An IRQ is not al 073 * of the OUTERMOST irq. An IRQ is not allowed to make context 074 * switches, so this context will remain 074 * switches, so this context will remain valid from the begining of 075 * the outermost IRQ handler to the end o 075 * the outermost IRQ handler to the end of it, no matter if there 076 * are other IRQ handlers nesting in one 076 * are other IRQ handlers nesting in one another. You may safely 077 * use it from IRQ handlers to query the 077 * use it from IRQ handlers to query the state of the interrupted 078 * thread, no matter if there has been ot 078 * thread, no matter if there has been other IRQ handlers 079 * executing meanwhile. 079 * executing meanwhile. 080 * - From normal kernel code, exceptions an 080 * - From normal kernel code, exceptions and syscall: the state of 081 * the thread the last time there was a c 081 * the thread the last time there was a context switch from this 082 * thread to another one. Thus this field 082 * thread to another one. Thus this field WON'T reflect the 083 * current's thread cpu_state in these ca 083 * current's thread cpu_state in these cases. So, in these cases, 084 * simply DO NOT USE IT outside thread.c 084 * simply DO NOT USE IT outside thread.c ! Note: for syscall and 085 * exception handlers, the VALID state of 085 * exception handlers, the VALID state of the interrupted thread is 086 * passed as an argument to the handlers. 086 * passed as an argument to the handlers. 087 */ 087 */ 088 struct sos_cpu_state *cpu_state; 088 struct sos_cpu_state *cpu_state; 089 089 090 /* Kernel stack parameters */ 090 /* Kernel stack parameters */ 091 sos_vaddr_t kernel_stack_base_addr; 091 sos_vaddr_t kernel_stack_base_addr; 092 sos_size_t kernel_stack_size; 092 sos_size_t kernel_stack_size; 093 093 094 /* Process this thread belongs to. Always NU 094 /* Process this thread belongs to. Always NULL for a kernel 095 thread */ 095 thread */ 096 struct sos_process *process; 096 struct sos_process *process; 097 097 098 /** 098 /** 099 * Address space currently "squatted" by the 099 * Address space currently "squatted" by the thread, or used to be 100 * active when the thread was interrupted/pr 100 * active when the thread was interrupted/preempted. This is the MMU 101 * configuration expected before the cpu_sta 101 * configuration expected before the cpu_state of the thread is 102 * restored on CPU. 102 * restored on CPU. 103 * - For kernel threads: should normally b 103 * - For kernel threads: should normally be NULL, meaning that the 104 * thread will squat the current mm_cont 104 * thread will squat the current mm_context currently set in the 105 * MMU. Might be NON NULL when a kernel 105 * MMU. Might be NON NULL when a kernel thread squats a given 106 * process to manipulate its address spa 106 * process to manipulate its address space. 107 * - For user threads: should normally be 107 * - For user threads: should normally be NULL. More precisely: 108 * - in user mode: the thread->process 108 * - in user mode: the thread->process.mm_context is ALWAYS 109 * set on MMU. squatted_mm_context i 109 * set on MMU. squatted_mm_context is ALWAYS NULL in this 110 * situation, meaning that the threa 110 * situation, meaning that the thread in user mode uses its 111 * process-space as expected 111 * process-space as expected 112 * - in kernel mode: NULL means that w 112 * - in kernel mode: NULL means that we keep on using the 113 * mm_context currently set on MMU, 113 * mm_context currently set on MMU, which might be the 114 * mm_context of another process. Th 114 * mm_context of another process. This is natural since a 115 * thread in kernel mode normally on 115 * thread in kernel mode normally only uses data in kernel 116 * space. BTW, this limits the numbe 116 * space. BTW, this limits the number of TLB flushes. However, 117 * there are exceptions where this s 117 * there are exceptions where this squatted_mm_context will 118 * NOT be NULL. One is the copy_from 118 * NOT be NULL. One is the copy_from/to_user API, which can 119 * force the effective mm_context so 119 * force the effective mm_context so that the MMU will be 120 * (re)configured upon every context 120 * (re)configured upon every context to the thread to match 121 * the squatted_mm_context. Another 121 * the squatted_mm_context. Another exception is when a parent 122 * thread creates the address space 122 * thread creates the address space of a child process, in 123 * which case the parent thread migh 123 * which case the parent thread might temporarilly decide to 124 * switch to the child's process spa 124 * switch to the child's process space. 125 * 125 * 126 * This is the SOS implementation of the Lin 126 * This is the SOS implementation of the Linux "Lazy TLB" and 127 * address-space loaning. 127 * address-space loaning. 128 */ 128 */ 129 struct sos_mm_context *squatted_mm_context; 129 struct sos_mm_context *squatted_mm_context; 130 130 131 /* Data specific to each state */ 131 /* Data specific to each state */ 132 union 132 union 133 { 133 { 134 struct 134 struct 135 { 135 { 136 struct sos_sched_queue *rdy_queue; 136 struct sos_sched_queue *rdy_queue; 137 struct sos_thread *rdy_prev, *rdy_ne 137 struct sos_thread *rdy_prev, *rdy_next; 138 } ready; 138 } ready; 139 }; /* Anonymous union (gcc extenion) */ << 140 139 141 struct sos_time user_time_spent_in_slice; !! 140 struct >> 141 { >> 142 struct sos_time user_time_spent_in_slice; >> 143 } running; >> 144 }; /* Anonymous union (gcc extenion) */ 142 145 143 146 144 /** 147 /** 145 * When a thread in kernel mode is accessing 148 * When a thread in kernel mode is accessing the user space, it may 146 * page fault in the usual way only if retur 149 * page fault in the usual way only if return_vaddr below is 147 * set. This structure holds information reg 150 * set. This structure holds information regarding what to do when a 148 * page fault from kernel into user space co 151 * page fault from kernel into user space could not be resolved. 149 * 152 * 150 * @note the fields below should be consider 153 * @note the fields below should be considered read-only. @see 151 * sos_thread_prepare_user_space_access() an 154 * sos_thread_prepare_user_space_access() and @see 152 * sos_thread_end_user_space_access() to mod 155 * sos_thread_end_user_space_access() to modify them. 153 */ 156 */ 154 struct 157 struct 155 { 158 { 156 /** This is the address (in kernel code) t 159 /** This is the address (in kernel code) to return to when a 157 user-space page fault from a kernel-mo 160 user-space page fault from a kernel-mode thread could not be 158 resolved. @see sos_thread_prepare_use 161 resolved. @see sos_thread_prepare_user_space_access() */ 159 sos_vaddr_t return_vaddr; 162 sos_vaddr_t return_vaddr; 160 163 161 /** This is the address of the user-space 164 /** This is the address of the user-space address that caused the 162 unresolved page fault (set by the page 165 unresolved page fault (set by the page fault handler) */ 163 sos_uaddr_t faulted_uaddr; 166 sos_uaddr_t faulted_uaddr; 164 } fixup_uaccess; 167 } fixup_uaccess; 165 168 166 169 167 /* 170 /* 168 * Data used by the kwaitq subsystem: list o 171 * Data used by the kwaitq subsystem: list of kwaitqueues the thread 169 * is waiting for. 172 * is waiting for. 170 * 173 * 171 * @note: a RUNNING or READY thread might be 174 * @note: a RUNNING or READY thread might be in one or more 172 * waitqueues ! The only property we have is 175 * waitqueues ! The only property we have is that, among these 173 * waitqueues (if any), _at least_ one has w 176 * waitqueues (if any), _at least_ one has woken the thread. 174 */ 177 */ 175 struct sos_kwaitq_entry *kwaitq_list; 178 struct sos_kwaitq_entry *kwaitq_list; 176 179 177 180 178 /** 181 /** 179 * Some statistics 182 * Some statistics 180 */ 183 */ 181 struct rusage 184 struct rusage 182 { 185 { 183 /* Updated by sched.c */ 186 /* Updated by sched.c */ 184 struct sos_time ru_utime; /* Time spent in 187 struct sos_time ru_utime; /* Time spent in user mode */ 185 struct sos_time ru_stime; /* Time spent in 188 struct sos_time ru_stime; /* Time spent in kernel mode */ 186 } rusage; 189 } rusage; 187 190 188 191 189 /** 192 /** 190 * Chaining pointers for the list of threads 193 * Chaining pointers for the list of threads in the parent process 191 */ 194 */ 192 struct sos_thread *prev_in_process, *next_in 195 struct sos_thread *prev_in_process, *next_in_process; 193 196 194 197 195 /** 198 /** 196 * Chaining pointers for global ("gbl") list 199 * Chaining pointers for global ("gbl") list of threads (debug) 197 */ 200 */ 198 struct sos_thread *gbl_prev, *gbl_next; 201 struct sos_thread *gbl_prev, *gbl_next; 199 }; 202 }; 200 203 201 204 202 /** 205 /** 203 * Definition of the function executed by a ke 206 * Definition of the function executed by a kernel thread 204 */ 207 */ 205 typedef void (*sos_kernel_thread_start_routine 208 typedef void (*sos_kernel_thread_start_routine_t)(void *arg); 206 209 207 210 208 /** 211 /** 209 * Initialize the subsystem responsible for th 212 * Initialize the subsystem responsible for thread management 210 * 213 * 211 * Initialize the primary kernel thread so tha 214 * Initialize the primary kernel thread so that it can be handled the 212 * same way as an ordinary thread created by s 215 * same way as an ordinary thread created by sos_thread_create(). 213 */ 216 */ 214 sos_ret_t sos_thread_subsystem_setup(sos_vaddr 217 sos_ret_t sos_thread_subsystem_setup(sos_vaddr_t init_thread_stack_base_addr, 215 sos_size_ 218 sos_size_t init_thread_stack_size); 216 219 217 220 218 /** 221 /** 219 * Create a new kernel thread 222 * Create a new kernel thread 220 */ 223 */ 221 struct sos_thread * 224 struct sos_thread * 222 sos_create_kernel_thread(const char *name, 225 sos_create_kernel_thread(const char *name, 223 sos_kernel_thread_sta 226 sos_kernel_thread_start_routine_t start_func, 224 void *start_arg, 227 void *start_arg, 225 sos_sched_priority_t 228 sos_sched_priority_t priority); 226 229 227 230 228 /** 231 /** 229 * Create a new user thread 232 * Create a new user thread 230 */ 233 */ 231 struct sos_thread * 234 struct sos_thread * 232 sos_create_user_thread(const char *name, 235 sos_create_user_thread(const char *name, 233 struct sos_process *pro 236 struct sos_process *process, 234 sos_uaddr_t user_initia 237 sos_uaddr_t user_initial_PC, 235 sos_ui32_t user_start_ 238 sos_ui32_t user_start_arg1, 236 sos_ui32_t user_start_ 239 sos_ui32_t user_start_arg2, 237 sos_uaddr_t user_initia 240 sos_uaddr_t user_initial_SP, 238 sos_sched_priority_t pr 241 sos_sched_priority_t priority); 239 242 240 243 241 /** 244 /** 242 * Create a new user thread, copy of the given 245 * Create a new user thread, copy of the given user thread with the 243 * given user context 246 * given user context 244 */ 247 */ 245 struct sos_thread * 248 struct sos_thread * 246 sos_duplicate_user_thread(const char *name, 249 sos_duplicate_user_thread(const char *name, 247 struct sos_process * 250 struct sos_process *process, 248 const struct sos_thr 251 const struct sos_thread * model_thread, 249 const struct sos_cpu 252 const struct sos_cpu_state * model_uctxt, 250 sos_ui32_t retval); 253 sos_ui32_t retval); 251 254 252 255 253 /** 256 /** 254 * Terminate the execution of the current thre 257 * Terminate the execution of the current thread. For kernel threads, 255 * it is called by default when the start rout 258 * it is called by default when the start routine returns. 256 */ 259 */ 257 void sos_thread_exit(void) __attribute__((nore !! 260 void sos_thread_exit() __attribute__((noreturn)); 258 261 259 262 260 /** 263 /** 261 * Get the identifier of the thread currently 264 * Get the identifier of the thread currently running on CPU. Trivial 262 * function. 265 * function. 263 */ 266 */ 264 struct sos_thread *sos_thread_get_current(void !! 267 struct sos_thread *sos_thread_get_current(); 265 268 266 269 267 /** 270 /** 268 * If thr == NULL, set the priority of the cur 271 * If thr == NULL, set the priority of the current thread. Trivial 269 * function. 272 * function. 270 * 273 * 271 * @note NOT protected against interrupts 274 * @note NOT protected against interrupts 272 */ 275 */ 273 sos_sched_priority_t sos_thread_get_priority(s 276 sos_sched_priority_t sos_thread_get_priority(struct sos_thread *thr); 274 277 275 278 276 /** 279 /** 277 * If thr == NULL, get the state of the curren 280 * If thr == NULL, get the state of the current thread. Trivial 278 * function. 281 * function. 279 * 282 * 280 * @note NOT protected against interrupts 283 * @note NOT protected against interrupts 281 */ 284 */ 282 sos_thread_state_t sos_thread_get_state(struct 285 sos_thread_state_t sos_thread_get_state(struct sos_thread *thr); 283 286 284 287 285 /** 288 /** 286 * If thr == NULL, set the priority of the cur 289 * If thr == NULL, set the priority of the current thread 287 * 290 * 288 * @note NO context-switch ever occurs in this 291 * @note NO context-switch ever occurs in this function ! 289 */ 292 */ 290 sos_ret_t sos_thread_set_priority(struct sos_t 293 sos_ret_t sos_thread_set_priority(struct sos_thread *thr, 291 sos_sched_pr 294 sos_sched_priority_t priority); 292 295 293 296 294 /** 297 /** 295 * Yield CPU to another ready thread. 298 * Yield CPU to another ready thread. 296 * 299 * 297 * @note This is a BLOCKING FUNCTION 300 * @note This is a BLOCKING FUNCTION 298 */ 301 */ 299 sos_ret_t sos_thread_yield(void); !! 302 sos_ret_t sos_thread_yield(); 300 303 301 304 302 /** 305 /** 303 * Release the CPU for (at least) the given de 306 * Release the CPU for (at least) the given delay. 304 * 307 * 305 * @param delay The delay to wait for. If dela 308 * @param delay The delay to wait for. If delay == NULL then wait 306 * forever that any event occurs. 309 * forever that any event occurs. 307 * 310 * 308 * @return SOS_OK when delay expired (and dela 311 * @return SOS_OK when delay expired (and delay is reset to zero), 309 * -SOS_EINTR otherwise (and delay contains th 312 * -SOS_EINTR otherwise (and delay contains the amount of time 310 * remaining). 313 * remaining). 311 * 314 * 312 * @note This is a BLOCKING FUNCTION 315 * @note This is a BLOCKING FUNCTION 313 */ 316 */ 314 sos_ret_t sos_thread_sleep(/* in/out */struct 317 sos_ret_t sos_thread_sleep(/* in/out */struct sos_time *delay); 315 318 316 319 317 /** 320 /** 318 * Mark the given thread as READY (if not alre 321 * Mark the given thread as READY (if not already ready) even if it is 319 * blocked in a kwaitq or in a sleep ! As a re 322 * blocked in a kwaitq or in a sleep ! As a result, the interrupted 320 * kwaitq/sleep function call of the thread wi 323 * kwaitq/sleep function call of the thread will return with 321 * -SOS_EINTR. 324 * -SOS_EINTR. 322 * 325 * 323 * @return -SOS_EINVAL if thread does not exis 326 * @return -SOS_EINVAL if thread does not exist, or -SOS_EFATAL if 324 * marked ZOMBIE. 327 * marked ZOMBIE. 325 * 328 * 326 * @note As a result, the semaphore/mutex/cond 329 * @note As a result, the semaphore/mutex/conditions/... functions 327 * return values SHOULD ALWAYS be checked ! If 330 * return values SHOULD ALWAYS be checked ! If they are != SOS_OK, 328 * then the caller should consider that the re 331 * then the caller should consider that the resource is not aquired 329 * because somebody woke the thread by some wa 332 * because somebody woke the thread by some way. 330 */ 333 */ 331 sos_ret_t sos_thread_force_unblock(struct sos_ 334 sos_ret_t sos_thread_force_unblock(struct sos_thread *thread); 332 335 333 /** 336 /** 334 * Dump the backtrace of the current thread to 337 * Dump the backtrace of the current thread to console and/or bochs 335 */ 338 */ 336 void sos_thread_dump_backtrace(sos_bool_t on_c 339 void sos_thread_dump_backtrace(sos_bool_t on_console, 337 sos_bool_t on_b 340 sos_bool_t on_bochs); 338 341 339 342 340 /* ******************************************* 343 /* ********************************************** 341 * Restricted functions 344 * Restricted functions 342 */ 345 */ 343 346 344 347 345 /** 348 /** 346 * Restricted function to indicate that we are 349 * Restricted function to indicate that we are to access the given 347 * user address space from inside the kernel. 350 * user address space from inside the kernel. 348 * 351 * 349 * @param dest_as The address space we want to 352 * @param dest_as The address space we want to access, or NULL to 350 * access current thread's address space 353 * access current thread's address space 351 * 354 * 352 * @param fixup_retvaddr When != 0, then dest_ 355 * @param fixup_retvaddr When != 0, then dest_as MUST BE NULL (we 353 * don't allow controlled access from kernel i 356 * don't allow controlled access from kernel into user space from a 354 * foreign thread). In this case, the page fau 357 * foreign thread). In this case, the page fault handler should accept 355 * page faults from the kernel in user space, 358 * page faults from the kernel in user space, and resolve them in the 356 * usual way. The value in retvaddr is where t 359 * usual way. The value in retvaddr is where the page fault handler 357 * has to return to in case the page fault rem 360 * has to return to in case the page fault remains unresolved. The 358 * address of the faulting address is kept in 361 * address of the faulting address is kept in 359 * éthread->fixup_uaccess.faulted_uaddr 362 * éthread->fixup_uaccess.faulted_uaddr 360 * 363 * 361 * @note typical values for fixup_retvaddr are 364 * @note typical values for fixup_retvaddr are obtained by "Labels as 362 * values" (see gcc's doc: operator "&&"). See 365 * values" (see gcc's doc: operator "&&"). See uaccess.c for example 363 * code. 366 * code. 364 */ 367 */ 365 sos_ret_t 368 sos_ret_t 366 sos_thread_prepare_user_space_access(struct so 369 sos_thread_prepare_user_space_access(struct sos_umem_vmm_as * dest_as, 367 sos_vaddr 370 sos_vaddr_t fixup_retvaddr); 368 371 369 372 370 /** 373 /** 371 * Restricted function to signal we are not ac 374 * Restricted function to signal we are not accessing any user address 372 * space anymore 375 * space anymore 373 */ 376 */ 374 sos_ret_t 377 sos_ret_t 375 sos_thread_end_user_space_access(void); 378 sos_thread_end_user_space_access(void); 376 379 377 380 378 /** 381 /** 379 * Restricted callback called when a syscall g 382 * Restricted callback called when a syscall goes back in user mode, 380 * to reconfigure the MMU to match that of the 383 * to reconfigure the MMU to match that of the current thread's 381 * process MMU context. 384 * process MMU context. 382 * 385 * 383 * @note The use of this function is RESERVED 386 * @note The use of this function is RESERVED to the syscall wrapper 384 */ 387 */ 385 void sos_thread_prepare_syscall_switch_back(st 388 void sos_thread_prepare_syscall_switch_back(struct sos_cpu_state *cpu_state); 386 389 387 390 388 /** 391 /** 389 * Restricted callback called when an exceptio 392 * Restricted callback called when an exception handler goes back to 390 * the interrupted thread to reconfigure the M 393 * the interrupted thread to reconfigure the MMU to match that of the 391 * current thread's process MMU context. 394 * current thread's process MMU context. 392 * 395 * 393 * @note The use of this function is RESERVED 396 * @note The use of this function is RESERVED to the exception wrappers 394 */ 397 */ 395 void sos_thread_prepare_exception_switch_back( 398 void sos_thread_prepare_exception_switch_back(struct sos_cpu_state *cpu_state); 396 399 397 400 398 /** 401 /** 399 * Restricted callback called when an IRQ is e 402 * Restricted callback called when an IRQ is entered while the CPU was 400 * NOT already servicing any other IRQ (ie the 403 * NOT already servicing any other IRQ (ie the outermost IRQ handler 401 * is entered). This callback simply updates t 404 * is entered). This callback simply updates the "cpu_state" field so 402 * that IRQ handlers always know the state of 405 * that IRQ handlers always know the state of the interrupted thread, 403 * even if they are imbricated in other IRQ ha 406 * even if they are imbricated in other IRQ handlers. 404 * 407 * 405 * @note The use of this function is RESERVED 408 * @note The use of this function is RESERVED to the irq wrappers 406 */ 409 */ 407 void 410 void 408 sos_thread_prepare_irq_servicing(struct sos_cp 411 sos_thread_prepare_irq_servicing(struct sos_cpu_state *interrupted_state); 409 412 410 413 411 /** 414 /** 412 * Restricted callback called when the outermo 415 * Restricted callback called when the outermost IRQ handler returns, 413 * to select the thread to return to. This cal 416 * to select the thread to return to. This callbacks implements: 414 * - preemption of user threads in user mode 417 * - preemption of user threads in user mode (time sharing / FIFO) 415 * - non-preemption of user threads in kerne 418 * - non-preemption of user threads in kernel mode (interrupted thread 416 * is restored on CPU "as is") 419 * is restored on CPU "as is") 417 * - non-preemption of kernel threads (same 420 * - non-preemption of kernel threads (same remark) 418 * The MMU is reconfigured correctly to match 421 * The MMU is reconfigured correctly to match the address space of the 419 * selected thread. 422 * selected thread. 420 * 423 * 421 * @return The CPU context of the thread to re 424 * @return The CPU context of the thread to return to 422 * 425 * 423 * @note The use of this function is RESERVED 426 * @note The use of this function is RESERVED to the irq wrappers 424 */ 427 */ 425 struct sos_cpu_state * 428 struct sos_cpu_state * 426 sos_thread_prepare_irq_switch_back(void); 429 sos_thread_prepare_irq_switch_back(void); 427 430 428 431 429 #endif /* _SOS_THREAD_H_ */ 432 #endif /* _SOS_THREAD_H_ */
| [ source navigation ] | [ diff markup ] | [ identifier search ] | [ general search ] |