source: trunk/kernel/kern/thread.h @ 346

Last change on this file since 346 was 337, checked in by alain, 8 years ago

Introduce the delayed context switch if current thread has a lock.
File size: 27.8 KB
Line 
1/*
2 * thread.h -  Thread and related operations definition.
3 *
4 * Author  Ghassan Almaless (2008,2009,2010,2011,2012)
5 *         Alain Greiner (2016)
6 *
7 * Copyright (c) UPMC Sorbonne Universites
8 *
9 * This file is part of ALMOS-MKH.
10 *
11 * ALMOS-MKH is free software; you can redistribute it and/or modify it
12 * under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; version 2.0 of the License.
14 *
15 * ALMOS-MKH is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with ALMOS-MKH; if not, write to the Free Software Foundation,
22 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
23 */
24
25#ifndef _THREAD_H_
26#define _THREAD_H_
27
28#include <hal_types.h>
29#include <hal_special.h>
30#include <xlist.h>
31#include <list.h>
32#include <hal_context.h>
33#include <spinlock.h>
34#include <core.h>
35#include <cluster.h>
36#include <process.h>
37#include <dev_ioc.h>
38#include <dev_nic.h>
39#include <dev_txt.h>
40#include <dev_mmc.h>
41#include <dev_dma.h>
42
43/***************************************************************************************
44 * These macros are used to compose or decompose global thread identifier (TRDID)
45 * to or from cluster identifier / local thread index (CXY , LTID)
46 **************************************************************************************/
47
48#define LTID_FROM_TRDID( trdid )   (ltid_t)(trdid & 0x0000FFFF)
49#define CXY_FROM_TRDID( trdid )    (cxy_t)(trdid >> 16)
50#define TRDID( cxy , ltid )        (trdid_t)((cxy << 16) | ltid )
51
52/***************************************************************************************
53 * This defines the various pthread_attr_t attributes bit-vector.
54 **************************************************************************************/
55
56/***************************************************************************************
57 * This opaque structure contains the user defined attributes for a user thread.
58 * It is passed as input argument to the thread_user_create() function.
59 * It is set by the user application itself, using the pthread_attr_***() functions.
60 * The currently supported attributes are defined below.
61 **************************************************************************************/
62
63typedef struct pthread_attr_s
64{
65        uint32_t    attributes;      /*! user defined attributes bit vector               */
66        cxy_t       cxy;             /*! target cluster identifier                        */
67        lid_t       lid;             /*! target core index                                */
68}
69pthread_attr_t;
70
71typedef enum
72{
73    PT_ATTR_DETACH          = 0x0001,  /*! user defined not joinable                  */
74    PT_ATTR_CLUSTER_DEFINED = 0x0002,  /*! user defined target cluster                */
75    PT_ATTR_CORE_DEFINED    = 0x0004,  /*! user defined core index in cluster         */
76}
77pt_attributes_t;
78
79/***************************************************************************************
80 * This enum defines the thread types.
81 **************************************************************************************/
82
83typedef enum
84{
85        THREAD_USER    = 0,          /*! user thread (pthread)                            */
86        THREAD_RPC     = 1,          /*! kernel thread executing pending RPCs             */
87        THREAD_DEV     = 2,          /*! kernel thread executing I/O device commands      */
88        THREAD_KERNEL  = 3,          /*! other kernel thread                              */
89        THREAD_IDLE    = 4,          /*! kernel idle thread                               */
90        THREAD_TYPES_NR
91}
92thread_type_t;
93
94/***************************************************************************************
95 * This defines the thread flags bit-vector.
96 **************************************************************************************/
97
98#define THREAD_FLAG_LOADABLE     0x0001  /*! This thread has not been executed yet    */
99#define THREAD_FLAG_DETACHED     0x0002  /*! This thread is detached from parent      */
100#define THREAD_FLAG_JOIN         0x0004  /*! Parent thread made a join                */
101#define THREAD_FLAG_EXIT         0x0008  /*! This thread made an exit                 */
102#define THREAD_FLAG_SCHED        0x0010  /*! Descheduling required for this thread    */
103
104/***************************************************************************************
105 * This defines the masks associated to the thread signals.
106 **************************************************************************************/
107
108#define THREAD_SIG_KILL          0x0001  /*! This thread must be destroyed ASAP       */
109
110/***************************************************************************************
111 * This defines the masks associated to the blocking causes.
112 **************************************************************************************/
113
114#define THREAD_BLOCKED_GLOBAL    0x0001  /*! thread deactivated / wait activation     */
115#define THREAD_BLOCKED_IO        0x0002  /*! thread wait IO operation completion      */
116#define THREAD_BLOCKED_MAPPER    0x0004  /*! thread wait mapper                       */
117#define THREAD_BLOCKED_JOIN      0x0008  /*! thread blocked in join / wait exit       */
118#define THREAD_BLOCKED_EXIT      0x0010  /*! thread blocked in exit / wait join i     */
119#define THREAD_BLOCKED_KILL      0x0020  /*! thread received kill signal              */
120#define THREAD_BLOCKED_SEM       0x0040  /*! thread wait semaphore                    */
121#define THREAD_BLOCKED_PAGE      0x0080  /*! thread wait page access                  */
122#define THREAD_BLOCKED_USERSYNC  0x0100  /*! thread wait POSIX (cond/mutex/barrier)   */
123
124#define THREAD_BLOCKED_IDLE      0x1000  /*! thread RPC wait activation               */
125#define THREAD_BLOCKED_DEV_QUEUE 0x2000  /*! thread DEV wait queue                    */
126#define THREAD_BLOCKED_DEV_ISR   0x4000  /*! thread DEV wait ISR                      */
127
128/***************************************************************************************
129 * This structure defines thread instrumentation informations.
130 **************************************************************************************/
131
132typedef struct thread_info_s
133{
134        uint32_t              pgfault_nr;    /*! cumulated number of page fault           */
135        uint32_t              sched_nr;      /*! TODO ???  [AG]                           */
136        uint32_t              u_err_nr;      /*! TODO ???  [AG]                           */
137        uint32_t              m_err_nr;      /*! TODO ???  [AG]                           */
138        uint32_t              tm_tmp;        /*! temp date to compute execution duration  */
139        uint32_t              tm_exec;       /*! TODO ???  [AG]                           */
140        uint32_t              tm_create;     /*! date of the creation                     */
141        uint32_t              tm_born;       /*! date of the thread loading               */
142        uint32_t              tm_dead;       /*! date of the death                        */
143        cycle_t               tm_sleep;      /*! TODO ???  [AG]                           */
144        cycle_t               tm_wait;       /*! TODO ???  [AG]                           */
145        cycle_t               tm_usr;        /*! user execution duration                  */
146        cycle_t               tm_sys;        /*! system execution duration                */
147}
148thread_info_t;
149
150/***************************************************************************************
151 * This structure defines a thread descriptor.
152 * It is used for both the user threads and the kernel threads.
153 * In a process, a user thread is identified by a unique TRDID (thread identifier),
154 * that is returned by the kernel to the user:
155 * - The TRDID 16 LSB bits contain the LTID (Local Thread Index).
156 * - The TRDID 16 MSB bits contain the CXY of cluster containing the thread.
157 * - The LTID is used to index the th_tbl[] array in the local process descriptor.
158 * This TRDID is computed by the process_register_thread() function, when the user
159 * thread is registered in the local copy of the process descriptor.
160 **************************************************************************************/
161
162#define THREAD_SIGNATURE    0xDEADBEEF
163
164typedef struct thread_s
165{
166    void              * cpu_uzone;       /*! used for exception/interrupt/syscall     */
167        void              * cpu_context;     /*! used for context switch                  */
168        void              * fpu_context;     /*! used for dynamic FPU allocation          */
169
170        uint32_t            trdid;           /*! thread index (cxy.ltid)                  */
171        thread_type_t       type;            /*! thread type                              */
172        uint32_t            quantum;         /*! number of clock ticks given to thread    */
173        uint32_t            ticks_nr;        /*! number of ticks used                     */
174        uint32_t            time_last_check; /*! last cpu_time_stamp                      */
175        core_t            * core;            /*! pointer to the owner core                */
176        process_t         * process;         /*! pointer on local process descriptor      */
177    xptr_t              parent;          /*! extended pointer on parent thread        */
178
179    void              * exit_value;      /*! exit_value used in case of join          */
180
181        uint32_t            local_locks;         /*! number of local locks owned by thread    */
182    list_entry_t        locks_root;      /*! root of local locks list                 */
183
184    remote_spinlock_t * flags_lock;      /*! lock protecting the flags                */
185
186        uint32_t            remote_locks;        /*! number of local locks owned by thread    */
187    xlist_entry_t       xlocks_root;     /*! root of remote locks list                */
188
189        intptr_t            u_stack_base;    /*! user stack base address                  */
190        uint32_t            u_stack_size;    /*! user stack size (bytes)                  */
191        intptr_t            k_stack_base;    /*! kernel stack base address                */
192        uint32_t            k_stack_size;    /*! kernel stack size (bytes)                */
193
194    void              * entry_func;      /*! pointer on entry function                */
195    void              * entry_args;      /*! pointer on entry function arguments      */
196
197    uint32_t            flags;           /*! bit vector of flags                      */
198    uint32_t            blocked;         /*! bit vector of blocking causes            */
199    uint32_t            signals;         /*! bit vector of signals                    */
200
201        error_t             errno;           /*! errno value set by last system call      */
202    uint32_t            utls;            /*! user thread local storage                */
203
204    bool_t              fork_user;       /*! user defined placement for next fork()   */
205    cxy_t               fork_cxy;        /*! target cluster  for next fork()          */
206
207        xlist_entry_t       children_root;   /*! root of list of attached children        */
208    uint32_t            children_nr;     /*! number of attached children threads      */
209    remote_spinlock_t * children_lock;   /*! lock protecting the children list        */
210
211    xlist_entry_t       brothers_list;   /*! member of threads with same parent       */
212
213        list_entry_t        sched_list;      /*! member of threads attached to same core  */
214
215    uint32_t            dev_channel;     /*! device channel for a DEV thread          */
216
217    ioc_command_t       ioc_cmd;         /*! IOC device generic command               */
218    txt_command_t       txt_cmd;         /*! TXT device generic command               */
219    nic_command_t       nic_cmd;         /*! NIC device generic command               */
220    mmc_command_t       mmc_cmd;         /*! MMC device generic command               */
221    dma_command_t       dma_cmd;         /*! DMA device generic command               */
222
223        cxy_t               rpc_client_cxy;  /*! client cluster index (for a RPC thread)  */
224
225    xlist_entry_t       wait_list;       /*! member of threads blocked on same cond   */
226
227        thread_info_t       info;            /*! embedded thread_info_t                   */
228
229        uint32_t            signature;       /*! for kernel stack overflow detection      */
230}
231thread_t;
232
233/***************************************************************************************
234 * This macro returns a pointer on the calling thread from the core hardware register.
235 **************************************************************************************/
236
237#define CURRENT_THREAD  (hal_get_current_thread())
238
239/***************************************************************************************
240 * This function returns a printable string for a thread type.
241 ***************************************************************************************
242 * @ type    : thread type.
243 * returns pointer on string.
244 **************************************************************************************/
245char * thread_type_str( uint32_t type );
246
247/***************************************************************************************
248 * This function allocates memory for a user thread descriptor in the local cluster,
249 * and initializes it from information contained in the arguments.
250 * It is used by the "pthread_create" system call.
251 * The CPU context is initialized from scratch, and the "loadable" field is set.
252 * The new thread is attached to the core specified in the <attr> argument.
253 * It is registered in the local process descriptor specified by the <pid> argument.
254 * The thread descriptor pointer is returned to allow the parent thread to register it
255 * in its children list.
256 * The THREAD_BLOCKED_GLOBAL bit is set => the thread must be activated to start.
257 ***************************************************************************************
258 * @ pid          : process identifier.
259 * @ start_func   : pointer on entry function.
260 * @ start_args   : pointer on function argument (can be NULL).
261 * @ attr         : pointer on pthread attributes descriptor.
262 * @ new_thread   : [out] address of buffer for new thread descriptor pointer.
263 * @ returns 0 if success / returns ENOMEM if error.
264 **************************************************************************************/
265error_t thread_user_create( pid_t             pid,
266                            void            * start_func,
267                            void            * start_arg,
268                            pthread_attr_t  * attr,
269                            thread_t       ** new_thread );
270
271/***************************************************************************************
272 * This function allocates memory for an user thread descriptor in the local cluster,
273 * and initializes it from information contained in the calling thread descriptor.
274 * It is used by the fork() system call to create the child process main thread.
275 * The new thread is attached to the core with the lowest load.
276 * It is registered in the process descriptor defined by the "process" argument.
277 * This new thread inherits its execution context from the calling thread,
278 * and the "loadable" field is NOT set.
279 * The THREAD_BLOCKED_GLOBAL bit is set, and the thread must be activated to start.
280 ***************************************************************************************
281 * @ process      : local pointer on owner process descriptor.
282 * @ new_thread   : [out] address of buffer for new thread descriptor pointer.
283 * @ returns 0 if success / returns ENOMEM if error.
284 **************************************************************************************/
285error_t thread_user_fork( process_t * process,
286                          thread_t ** new_thread );
287
288/***************************************************************************************
289 * This function allocates memory for a kernel thread descriptor in the local cluster,
290 * and initializes it from arguments values, calling the thread_kernel_init() function,
291 * that also allocates and initializes the CPU context.
292 * The THREAD_BLOCKED_GLOBAL bit is set, and the thread must be activated to start.
293 ***************************************************************************************
294 * @ new_thread   : address of buffer for new thread pointer.
295 * @ type         : kernel thread type.
296 * @ func         : pointer on function.
297 * @ args         : function arguments.
298 * @ core_lid     : local core index.
299 * @ returns 0 if success / returns ENOMEM if error
300 **************************************************************************************/
301error_t thread_kernel_create( thread_t     ** new_thread,
302                              thread_type_t   type,
303                              void          * func,
304                              void          * args,
305                              lid_t           core_lid );
306
307/***************************************************************************************
308 * This function initializes an existing kernel thread descriptor from arguments values.
309 * The THREAD_BLOCKED_GLOBAL bit is set, and the thread must be activated to start.
310 ***************************************************************************************
311 * @ thread   : pointer on existing thread descriptor.
312 * @ type     : kernel thread type.
313 * @ func     : pointer on function.
314 * @ args     : function arguments.
315 * @ core_lid : local core index.
316 * @ returns 0 if success / returns EINVAL if error
317 **************************************************************************************/
318error_t thread_kernel_init( thread_t      * thread,
319                            thread_type_t   type,
320                            void          * func,
321                            void          * args,
322                            lid_t           core_lid );
323
324/***************************************************************************************
325 * This function releases the physical memory allocated for a thread descriptor
326 * in the local cluster. It can be used for both an user and a kernel thread.
327 * The physical memory dynamically allocated in the HEAP or MMAP zones by an user
328 * thread will be released when the process is killed, and the page table flushed.
329 ***************************************************************************************
330 * @ thread  : pointer on the thread descriptor to release.
331 **************************************************************************************/
332void thread_destroy( thread_t * thread );
333
334/***************************************************************************************
335 * This function defines the code of the thread executed by all cores after kernel_init,
336 * or when no other thread is runnable for a given core.
337 *
338 * TODO: In the TSAR architecture, it enters an infinite loop, in wich it forces
339 * the core in sleep (low-power) mode. Any IRQ will force the core to exit this sleep
340 * mode, but no ISR is executed.
341 * TODO: We must analyse if we have the same behaviour for I86 architectures...
342 **************************************************************************************/
343void thread_idle_func();
344
345/***************************************************************************************
346 * This function registers a child thread in the global list of attached
347 * children threads of a parent thread.
348 * It does NOT take a lock, as this function is always called by the parent thread.
349 ***************************************************************************************
350 * @ xp_parent : extended pointer on the parent thread descriptor.
351 * @ xp_child  : extended pointer on the child thread descriptor.
352 **************************************************************************************/
353void thread_child_parent_link( xptr_t  xp_parent,
354                               xptr_t  xp_child );
355
356/***************************************************************************************
357 * This function removes an user thread from the parent thread global list
358 * of attached children threads.
359 ***************************************************************************************
360 * @ xp_parent : extended pointer on the parent thread descriptor.
361 * @ xp_child  : extended pointer on the child thread descriptor.
362 **************************************************************************************/
363void thread_child_parent_unlink( xptr_t xp_parent,
364                                 xptr_t xp_child );
365
366/***************************************************************************************
367 * This function atomically sets a signal in a thread descriptor.
368 ***************************************************************************************
369 * @ thread    : local pointer on target thread.
370 * @ mask      : mask on selected signal.
371 **************************************************************************************/
372inline void thread_set_signal( thread_t * thread,
373                               uint32_t   mask );
374
375/***************************************************************************************
376 * This function resets a signal in a thread descriptor.
377 ***************************************************************************************
378 * @ thread    : local pointer on target thread.
379 * @ mask      : mask on selected signal.
380 **************************************************************************************/
381inline void thread_reset_signal( thread_t * thread,
382                                 uint32_t   mask );
383
384/***************************************************************************************
385 * This function returns true if the calling thread is attached to its parent thread.
386 **************************************************************************************/
387inline bool_t thread_is_joinable();
388
389/***************************************************************************************
390 * This function returns true if the calling thread is not blocked.
391 **************************************************************************************/
392inline bool_t thread_is_runnable();
393
394/***************************************************************************************
395 * This function checks if the calling thread can deschedule.
396 ***************************************************************************************
397 * @ returns true if no locks taken.
398 **************************************************************************************/
399inline bool_t thread_can_yield();
400
401/***************************************************************************************
402 * This function checks if the calling thread must be descheduled.
403 ***************************************************************************************
404 * @ returns true if no locks taken, and elapsed time.
405 **************************************************************************************/
406bool_t thread_check_sched();
407
408/***************************************************************************************
409 * This function can be used by the calling thread to suicide.
410 * All locks must be previously released.
411 * The scenario depends on the attached/detached flag :
412 * - if detached, it sets the SIG_KILL signal in the "signals" bit_vector, registers
413 *   the BLOCKED_EXIT bit in the "blocked" bit_vector, and deschedule.
414 * - if attached, it simply sets the BLOCKED_EXIT bit in the "blocked" bit vector
415 *   and deschedule. The SIG_KILL signal will be set by the parent thread when
416 *   executing the pthread_join().
417 ***************************************************************************************
418 * @ returns 0 if success / returns EINVAL if locks_count is not zero.
419 **************************************************************************************/
420error_t thread_exit();
421
422/***************************************************************************************
423 * This function registers a blocking cause in the target thread "blocked" bit vector.
424 * Warning : this function does not deschedule the calling thread.
425 * The descheduling can be forced by a sched_yield().
426 ***************************************************************************************
427 * @ thread   : local pointer on target thread.
428 * @ cause    : mask defining the cause (one hot).
429 **************************************************************************************/
430void thread_block( thread_t * thread,
431                   uint32_t   cause );
432
433/***************************************************************************************
434 * This function resets the bit identified by the cause argument in the "blocked"
435 * bit vector of a remote thread descriptor.
436 * We need an extended pointer, because the client thread of an I/O operation on a
437 * given device is not in the same cluster as the associated device descriptor.
438 * Warning : this function does not reschedule the remote thread.
439 * The scheduling can be forced by sending an IPI to the core running the remote thread.
440 ***************************************************************************************
441 * @ thread   : extended pointer on the remote thread.
442 * @ cause    : mask defining the cause (one hot).
443 **************************************************************************************/
444void thread_unblock( xptr_t   thread,
445                     uint32_t cause );
446
447/***************************************************************************************
448 * This function kills a target thread, identified by its local pointer.
449 * It is generally called by the local process_destroy() function.
450 * - it forces the global blocked bit in target thread descriptor.
451 * - it set the SIG_KILL signal in target thread.
452 * - it send an IPI_SCHED_REQUEST to the target thread core.
453 ***************************************************************************************
454 * @ thread   : local pointer on the target thread.
455 * @ returns 0 if success / returns EINVAL if locks_count is not zero.
456 **************************************************************************************/
457void thread_kill( thread_t * thread );
458
459/***************************************************************************************
460 * This function updates the calling thread user_time counter, and resets the thread
461 * cycles counter.
462 * TODO This function is not implemented.
463 ***************************************************************************************
464 * @ thread   : local pointer on target thread.
465 **************************************************************************************/
466void thread_user_time_update( thread_t * thread );
467
468/**************************************************************************************n
469 * This function updates the calling thread kernel_time counter, and resets the thread
470 * cycles counter.
471 * TODO This function is not implemented.
472 ***************************************************************************************
473 * @ thread   : local pointer on target thread.
474 **************************************************************************************/
475void thread_kernel_time_update( thread_t * thread );
476
477/***************************************************************************************
478 * This function handles all pending signals for the thread identified by the <thread>
479 * argument. It is called each time the core exits the kernel, after handling an
480 * interrupt, exception or syscall.
481 * TODO This function is not implemented.
482 ***************************************************************************************
483 * @ thread   : local pointer on target thread.
484 **************************************************************************************/
485void thread_signals_handle( thread_t * thread );
486
487/***************************************************************************************
488 * This function returns the extended pointer on a thread descriptor identified
489 * by its thread identifier, and process identifier.
490 * It can be called by any thread running in any cluster.
491 ***************************************************************************************
492 * @ pid     : process identifier.
493 * @ trdid   : thread identifier.
494 * @ return the extended pointer if thread found / return XPTR_NULL if not found.
495 **************************************************************************************/
496xptr_t thread_get_xptr( pid_t    pid,
497                        trdid_t  trdid );
498
499
500#endif  /* _THREAD_H_ */
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