source: trunk/kernel/kern/thread.h @ 440

Last change on this file since 440 was 440, checked in by alain, 6 years ago

1/ Fix a bug in the Multithreaded "sort" applicationr:
The pthread_create() arguments must be declared as global variables.
2/ The exit syscall can be called by any thread of a process..
File size: 25.1 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 <shared_syscalls.h>
30#include <hal_special.h>
31#include <xlist.h>
32#include <list.h>
33#include <hal_context.h>
34#include <spinlock.h>
35#include <core.h>
36#include <chdev.h>
37#include <cluster.h>
38#include <process.h>
39#include <dev_ioc.h>
40#include <dev_nic.h>
41#include <dev_txt.h>
42#include <dev_mmc.h>
43#include <dev_dma.h>
44
45/***************************************************************************************
46 * These macros are used to compose or decompose the global thread identifier (TRDID)
47 * to or from cluster identifier / local thread index (CXY , LTID)
48 **************************************************************************************/
49
50#define LTID_FROM_TRDID( trdid )   (ltid_t)(trdid & 0x0000FFFF)
51#define CXY_FROM_TRDID( trdid )    (cxy_t)(trdid >> 16)
52#define TRDID( cxy , ltid )        (trdid_t)((cxy << 16) | ltid )
53
54/***************************************************************************************
55 * This enum defines the thread types.
56 **************************************************************************************/
57
58typedef enum
59{
60        THREAD_USER    = 0,          /*! user thread (pthread)                            */
61        THREAD_RPC     = 1,          /*! kernel thread executing pending RPCs             */
62        THREAD_DEV     = 2,          /*! kernel thread executing I/O device commands      */
63        THREAD_IDLE    = 3,          /*! kernel idle thread                               */
64}
65thread_type_t;
66
67/***************************************************************************************
68 * This defines the thread flags bit-vector.
69 **************************************************************************************/
70
71#define THREAD_FLAG_DETACHED     0x0001  /*! This thread is detached from parent      */
72#define THREAD_FLAG_JOIN_DONE    0x0002  /*! Parent thread made a join request        */
73#define THREAD_FLAG_KILL_DONE    0x0004  /*! This thread received a kill request      */
74#define THREAD_FLAG_SCHED        0x0008  /*! Scheduling required for this thread      */
75#define THREAD_FLAG_REQ_ACK      0x0010  /*! Acknowledge required from scheduler      */
76#define THREAD_FLAG_REQ_DELETE   0x0020  /*! Destruction required from scheduler      */
77
78/***************************************************************************************
79 * This defines the masks associated to the blocking causes.
80 **************************************************************************************/
81
82#define THREAD_BLOCKED_GLOBAL    0x0001  /*! thread deactivated / wait activation     */
83#define THREAD_BLOCKED_IO        0x0002  /*! thread wait IO operation completion      */
84#define THREAD_BLOCKED_MAPPER    0x0004  /*! thread wait mapper                       */
85#define THREAD_BLOCKED_EXIT      0x0008  /*! thread blocked in join / wait exit       */
86#define THREAD_BLOCKED_JOIN      0x0010  /*! thread blocked in exit / wait join       */
87#define THREAD_BLOCKED_SEM       0x0020  /*! thread wait semaphore                    */
88#define THREAD_BLOCKED_PAGE      0x0040  /*! thread wait page access                  */
89#define THREAD_BLOCKED_IDLE      0x0080  /*! thread RPC wait RPC_FIFO non empty       */
90#define THREAD_BLOCKED_USERSYNC  0x0100  /*! thread wait (cond/mutex/barrier)         */
91#define THREAD_BLOCKED_RPC       0x0200  /*! thread wait RPC completion               */
92#define THREAD_BLOCKED_ISR       0x0400  /*! thread DEV wait ISR                      */
93#define THREAD_BLOCKED_WAIT      0x0800  /*! thread parent wait child termination     */
94
95/***************************************************************************************
96 * This structure defines thread instrumentation informations.
97 **************************************************************************************/
98
99typedef struct thread_info_s
100{
101        uint32_t              pgfault_nr;    /*! cumulated number of page fault           */
102        uint32_t              sched_nr;      /*! TODO ???  [AG]                           */
103        uint32_t              u_err_nr;      /*! TODO ???  [AG]                           */
104        uint32_t              m_err_nr;      /*! TODO ???  [AG]                           */
105        uint32_t              tm_tmp;        /*! temp date to compute execution duration  */
106        uint32_t              tm_exec;       /*! TODO ???  [AG]                           */
107        uint32_t              tm_create;     /*! date of the creation                     */
108        uint32_t              tm_born;       /*! date of the thread loading               */
109        uint32_t              tm_dead;       /*! date of the death                        */
110        cycle_t               tm_sleep;      /*! TODO ???  [AG]                           */
111        cycle_t               tm_wait;       /*! TODO ???  [AG]                           */
112        cycle_t               tm_usr;        /*! user execution duration                  */
113        cycle_t               tm_sys;        /*! system execution duration                */
114}
115thread_info_t;
116
117/***************************************************************************************
118 * This structure defines a thread descriptor.
119 * It is used for both the user threads and the kernel threads.
120 * In a process, a user thread is identified by a unique TRDID (thread identifier),
121 * that is returned by the kernel to the user:
122 * - The TRDID 16 LSB bits contain the LTID (Local Thread Index).
123 * - The TRDID 16 MSB bits contain the CXY of cluster containing the thread.
124 * - The LTID is used to index the th_tbl[] array in the local process descriptor.
125 _* This TRDID is computed by the process_register_thread() function, when the user
126 * thread is registered in the local copy of the process descriptor.
127 *
128 * WARNING : Don't modify the first 4 fields order, as this order is used by the
129 * hal_kentry assembly code for the TSAR architecture.
130 **************************************************************************************/
131
132#define THREAD_SIGNATURE    0xDEADBEEF
133
134typedef struct thread_s
135{
136        void              * cpu_context;     /*! pointer on CPU context switch            */
137        void              * fpu_context;     /*! pointer on FPU context switch            */
138    void              * uzone_current;   /*! used by hal_do_syscall & hal_do_except   */
139    void              * uzone_previous;  /*! used by hal_do_syscall & hal_do_except   */
140
141        intptr_t            k_stack_base;    /*! kernel stack base address                */
142        uint32_t            k_stack_size;    /*! kernel stack size (bytes)                */
143
144        uint32_t            trdid;           /*! thread index (cxy.ltid)                  */
145        thread_type_t       type;            /*! thread type                              */
146        uint32_t            quantum;         /*! number of clock ticks given to thread    */
147        uint32_t            ticks_nr;        /*! number of ticks used                     */
148        uint32_t            time_last_check; /*! last cpu_time_stamp                      */
149        core_t            * core;            /*! pointer to the owner core                */
150        process_t         * process;         /*! pointer on local process descriptor      */
151    xptr_t              parent;          /*! extended pointer on parent thread        */
152
153    remote_spinlock_t   join_lock;       /*! lock protecting the join/exit            */
154    xptr_t              join_xp;         /*! joining/killer thread extended pointer   */
155
156    uint32_t          * ack_rsp_count;   /*! pointer on acknowledge response counter  */
157
158        intptr_t            u_stack_base;    /*! user stack base address                  */
159        uint32_t            u_stack_size;    /*! user stack size (bytes)                  */
160
161    void              * entry_func;      /*! pointer on entry function                */
162    void              * entry_args;      /*! pointer on entry function arguments      */
163
164    uint32_t            flags;           /*! bit vector of flags                      */
165    uint32_t            blocked;         /*! bit vector of blocking causes            */
166
167        error_t             errno;           /*! errno value set by last system call      */
168    uint32_t            utls;            /*! user thread local storage                */
169
170    bool_t              fork_user;       /*! user defined placement for next fork()   */
171    cxy_t               fork_cxy;        /*! target cluster  for next fork()          */
172
173        list_entry_t        sched_list;      /*! member of threads attached to same core  */
174
175    chdev_t           * chdev;           /*! chdev pointer (for a DEV thread only)    */
176
177    reg_t               save_sr;         /*! used by sched_yield() function           */
178
179    ioc_command_t       ioc_cmd;         /*! IOC device generic command               */
180    txt_command_t       txt_cmd;         /*! TXT device generic command               */
181    nic_command_t       nic_cmd;         /*! NIC device generic command               */
182    mmc_command_t       mmc_cmd;         /*! MMC device generic command               */
183    dma_command_t       dma_cmd;         /*! DMA device generic command               */
184
185        cxy_t               rpc_client_cxy;  /*! client cluster index (for a RPC thread)  */
186
187    xlist_entry_t       wait_list;       /*! member of threads blocked on same cond   */
188
189    list_entry_t        locks_root;      /*! root of list of locks taken              */
190    xlist_entry_t       xlocks_root;     /*! root of xlist of remote locks taken      */
191        uint32_t            local_locks;         /*! number of local locks owned by thread    */
192        uint32_t            remote_locks;        /*! number of remote locks owned by thread   */
193
194        thread_info_t       info;            /*! embedded thread_info_t                   */
195
196        uint32_t            signature;       /*! for kernel stack overflow detection      */
197}
198thread_t;
199
200/***************************************************************************************
201 * This macro returns a pointer on the calling thread from the core hardware register.
202 **************************************************************************************/
203
204#define CURRENT_THREAD  (hal_get_current_thread())
205
206/***************************************************************************************
207 * This function returns a printable string for a thread type.
208 ***************************************************************************************
209 * @ type    : thread type.
210 * returns pointer on string.
211 **************************************************************************************/
212char * thread_type_str( uint32_t type );
213
214/***************************************************************************************
215 * This function is used by the pthread_create() system call to create a "new" thread
216 * in an existing process. It allocates memory for an user thread descriptor in the
217 * local cluster, and initializes it from information contained in the arguments.
218 * The CPU context is initialized from scratch.
219 * It is registered in the local process descriptor specified by the <pid> argument.
220 * The THREAD_BLOCKED_GLOBAL bit is set => the thread must be activated to start.
221 ***************************************************************************************
222 * @ pid          : process identifier.
223 * @ start_func   : pointer on entry function.
224 * @ start_args   : pointer on function argument (can be NULL).
225 * @ attr         : pointer on pthread attributes descriptor.
226 * @ new_thread   : [out] address of buffer for new thread descriptor pointer.
227 * @ returns 0 if success / returns ENOMEM if error.
228 **************************************************************************************/
229error_t thread_user_create( pid_t             pid,
230                            void            * start_func,
231                            void            * start_arg,
232                            pthread_attr_t  * attr,
233                            thread_t       ** new_thread );
234
235/***************************************************************************************
236 * This function is used by the sys_fork() system call to create the "child" thread
237 * in the local cluster. It allocates memory for a thread descriptor, and initializes
238 * it from the "parent" thread descriptor defined by the <parent_thread_xp> argument.
239 * The new thread is attached to the core that has the lowest load in local cluster.
240 * It is registered in the "child" process defined by the <child_process> argument.
241 * This new thread inherits its user stack from the parent thread, as it uses the
242 * Copy-On-Write mechanism to get a private stack when required.
243 * The content of the parent kernel stack is copied into the child kernel stack, as
244 * the Copy-On-Write mechanism cannot be used for kernel segments (because kernel
245 * uses physical addressing on some architectures).
246 * The CPU and FPU execution contexts are created and linked to the new thread.
247 * but the actual context copy is NOT done, and must be done by by the sys_fork().
248 * The THREAD_BLOCKED_GLOBAL bit is set => the thread must be activated to start.
249 ***************************************************************************************
250 * @ parent_thread_xp  : extended pointer on parent thread descriptor.
251 * @ child_process     : local pointer on child process descriptor.
252 * @ child_thread      : [out] address of buffer for child thread descriptor pointer.
253 * @ returns 0 if success / returns -1 if error.
254 **************************************************************************************/
255error_t thread_user_fork( xptr_t      parent_thread_xp,
256                          process_t * child_process,
257                          thread_t ** child_thread );
258
259/***************************************************************************************
260 * This function allocates memory for a kernel thread descriptor in the local cluster,
261 * and initializes it from arguments values.
262 * It is called by kernel_init() to statically create all DEV server threads
263 * It is also called to dynamically create RPC threads when required.
264 * The THREAD_BLOCKED_GLOBAL bit is set, and the thread must be activated to start.
265 ***************************************************************************************
266 * @ new_thread   : address of buffer for new thread pointer.
267 * @ type         : kernel thread type.
268 * @ func         : pointer on function.
269 * @ args         : function arguments.
270 * @ core_lid     : local core index.
271 * @ returns 0 if success / returns ENOMEM if error
272 **************************************************************************************/
273error_t thread_kernel_create( thread_t     ** new_thread,
274                              thread_type_t   type,
275                              void          * func,
276                              void          * args,
277                              lid_t           core_lid );
278
279/***************************************************************************************
280 * This function is called by the kernel_init() function to initialize the IDLE thread.
281 * It initializes an existing thread descriptor from arguments values.
282 * The THREAD_BLOCKED_GLOBAL bit is set, and the thread must be activated to start.
283 ***************************************************************************************
284 * @ thread   : pointer on existing thread descriptor.
285 * @ type     : kernel thread type.
286 * @ func     : pointer on function.
287 * @ args     : function arguments.
288 * @ core_lid : local core index.
289 * @ returns 0 if success / returns EINVAL if error
290 **************************************************************************************/
291error_t thread_idle_init( thread_t      * thread,
292                          thread_type_t   type,
293                          void          * func,
294                          void          * args,
295                          lid_t           core_lid );
296
297/***************************************************************************************
298 * This function releases the physical memory allocated for a thread in a given cluster.
299 * This include the thread descriptor itself, the associated CPU and FPU context, and
300 * the physical memory allocated for an user thread local stack.
301 ***************************************************************************************
302 * @ thread  : pointer on the thread descriptor to release.
303 **************************************************************************************/
304void thread_destroy( thread_t * thread );
305
306/***************************************************************************************
307 * This function defines the code of the thread executed by all cores after kernel_init,
308 * or when no other thread is runnable for a given core.
309 *
310 * TODO: In the TSAR architecture, it enters an infinite loop, in wich it forces
311 * the core in sleep (low-power) mode. Any IRQ will force the core to exit this sleep
312 * mode, but no ISR is executed.
313 * TODO: We must analyse if we have the same behaviour for I86 architectures...
314 **************************************************************************************/
315void thread_idle_func();
316
317/***************************************************************************************
318 * This function is used by a "blocker" thread running in the same cluster as a "target"
319 * thread to request the scheduler of the target thread to acknowledge that the target
320 * thread is blocked and not running, at the next context switch.
321 * This function executes atomically the following actions :
322 * - it set the request_pending boolean in the target scheduler descriptor.
323 * - it set the REQ_ACK flag in the "flags" field of the target thread descriptor.
324 * - It registers the responses counter pointer in the target thread descriptor.
325 * The request_pending flag is handled as a set/reset flip-flop by the "blocker" thread
326 * and by the "target" scheduler.
327 ***************************************************************************************
328 * @ target        : local pointer on target thread.
329 * @ ack_rsp_count : local pointer on responses counter.
330 **************************************************************************************/
331void thread_set_req_ack( thread_t * target,
332                         uint32_t * ack_rsp_count );
333
334/***************************************************************************************
335 * This function is used by the sched_handle_signal() function executed by the
336 * scheduler of a "target" thread to reset a "blocked not running" acknowledge request
337 * in both the target thread descriptor, and in the target  thread scheduler.
338 ***************************************************************************************
339 * @ target    : local pointer on target thread.
340 **************************************************************************************/
341void thread_reset_req_ack( thread_t * target );
342
343/***************************************************************************************
344 * This function checks if the calling thread can deschedule.
345 ***************************************************************************************
346 * @ returns true if no locks taken.
347 **************************************************************************************/
348inline bool_t thread_can_yield();
349
350/***************************************************************************************
351 * This function implements the delayed descheduling mechanism : It is called  by
352 * all lock release functions, and calls the sched_yield() function when all locks
353 * have beeen released and the calling thread THREAD_FLAG_SCHED flag is set.
354 **************************************************************************************/
355void thread_check_sched();
356
357/***************************************************************************************
358 * This function is used by the four sys_thread_cancel(), sys_thread_exit(),
359 * sys_kill() and sys_exit() system calls to delete a given thread.
360 * It set the THREAD_BLOCKED_GLOBAL bit and set the the THREAD_FLAG_REQ_DELETE bit
361 * in the thread descriptor identified by the <thread_xp> argument, to ask the scheduler
362 * to asynchronously delete the target thread, at the next scheduling point.
363 * The calling thread can run in any cluster, as it uses remote accesses, but
364 * the target thread cannot be the main thread of the process identified by the <pid>,
365 * because the main thread must be deleted by the parent process argument.
366 * If the target thread is running in "attached" mode, and the <is_forced> argument
367 * is false, this function implements the required sychronisation with the joining
368 * thread, blocking the calling thread until the pthread_join() syscall is executed.
369 ***************************************************************************************
370 * @ thread_xp   : extended pointer on the target thread.
371 * @ pid         : process identifier (to get the owner cluster identifier).
372 * @ is_forced   : the deletion does not depends on the attached mode.
373 **************************************************************************************/
374void thread_delete( xptr_t  thread_xp,
375                    pid_t   pid,
376                    bool_t  is_forced );
377
378/***************************************************************************************
379 * This function registers a blocking cause defined by the <cause> argument
380 * in a remote thread descriptor identified by the <thread_xp> argument.
381 * We need an extended pointer, because this function can be called by another thread
382 * than the target thread, executing the sys_kill() function.
383 * WARNING : this function does not deschedule the target thread, and the descheduling
384 * must be explicitely forced by a sched_yield().
385 ***************************************************************************************
386 * @ thread_xp   : extended pointer on remote thread descriptor.
387 * @ cause       : mask defining the cause (one hot).
388 **************************************************************************************/
389void thread_block( xptr_t   thread_xp,
390                   uint32_t cause );
391
392/***************************************************************************************
393 * This function resets the bit identified by the <cause> argument in a remote
394 * thread descriptor identified by the <thread_xp> argument.
395 * We need an extended pointer, because the client thread of an I/O operation on a
396 * given device is not in the same cluster as the associated device descriptor.
397 * WARNING : this function does not reschedule the remote thread.
398 * The scheduling can be forced by sending an IPI to the core running the remote thread.
399 ***************************************************************************************
400 * @ thread_xp   : extended pointer the remote thread.
401 * @ cause       : mask defining the cause (one hot).
402 * @ return non zero if the bit-vector was actually modified / return 0 otherwise
403 **************************************************************************************/
404uint32_t thread_unblock( xptr_t   thread_xp,
405                         uint32_t cause );
406
407/***************************************************************************************
408 * This function updates the calling thread user_time counter, and resets the thread
409 * cycles counter.
410 * TODO This function is not implemented.
411 ***************************************************************************************
412 * @ thread   : local pointer on target thread.
413 **************************************************************************************/
414void thread_user_time_update( thread_t * thread );
415
416/**************************************************************************************n
417 * This function updates the calling thread kernel_time counter, and resets the thread
418 * cycles counter.
419 * TODO This function is not implemented.
420 ***************************************************************************************
421 * @ thread   : local pointer on target thread.
422 **************************************************************************************/
423void thread_kernel_time_update( thread_t * thread );
424
425/***************************************************************************************
426 * This function returns the extended pointer on a thread descriptor identified
427 * by its thread identifier, and process identifier.
428 * It can be called by any thread running in any cluster.
429 ***************************************************************************************
430 * @ pid     : process identifier.
431 * @ trdid   : thread identifier.
432 * @ return the extended pointer if thread found / return XPTR_NULL if not found.
433 **************************************************************************************/
434xptr_t thread_get_xptr( pid_t    pid,
435                        trdid_t  trdid );
436
437
438#endif  /* _THREAD_H_ */
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