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  1. /*
  2.  * Copyright (c) 2006 Jakub Jermar
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. /** @addtogroup libc
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #include <thread.h>
  36. #include <libc.h>
  37. #include <stdlib.h>
  38. #include <libarch/faddr.h>
  39. #include <kernel/proc/uarg.h>
  40. #include <fibril.h>
  41. #include <string.h>
  42. #include <async.h>
  43.  
  44. #include <stdio.h>
  45.  
  46.  
  47. #ifndef THREAD_INITIAL_STACK_PAGES_NO
  48. #define THREAD_INITIAL_STACK_PAGES_NO 1
  49. #endif
  50.  
  51. static LIST_INITIALIZE(thread_garbage);
  52.  
  53. extern char _tdata_start;
  54. extern char _tdata_end;
  55. extern char _tbss_start;
  56. extern char _tbss_end;
  57.  
  58. /** Create TLS (Thread Local Storage) data structures.
  59.  *
  60.  * The code requires, that sections .tdata and .tbss are adjacent. It may be
  61.  * changed in the future.
  62.  *
  63.  * @return Pointer to TCB.
  64.  */
  65. tcb_t *__make_tls(void)
  66. {
  67.     void *data;
  68.     tcb_t *tcb;
  69.     size_t tls_size = &_tbss_end - &_tdata_start;
  70.    
  71.     tcb = __alloc_tls(&data, tls_size);
  72.    
  73.     /*
  74.      * Copy thread local data from the initialization image.
  75.      */
  76.     memcpy(data, &_tdata_start, &_tdata_end - &_tdata_start);
  77.     /*
  78.      * Zero out the thread local uninitialized data.
  79.      */
  80.     memset(data + (&_tbss_start - &_tdata_start), 0,
  81.         &_tbss_end - &_tbss_start);
  82.  
  83.     return tcb;
  84. }
  85.  
  86. void __free_tls(tcb_t *tcb)
  87. {
  88.     size_t tls_size = &_tbss_end - &_tdata_start;
  89.     __free_tls_arch(tcb, tls_size);
  90. }
  91.  
  92. /** Main thread function.
  93.  *
  94.  * This function is called from __thread_entry() and is used
  95.  * to call the thread's implementing function and perform cleanup
  96.  * and exit when thread returns back. Do not call this function
  97.  * directly.
  98.  *
  99.  * @param uarg Pointer to userspace argument structure.
  100.  */
  101. void __thread_main(uspace_arg_t *uarg)
  102. {
  103.     fibril_t *f;
  104.  
  105.     f = fibril_setup();
  106.     __tcb_set(f->tcb);
  107.    
  108.     uarg->uspace_thread_function(uarg->uspace_thread_arg);
  109.     /* XXX: we cannot free the userspace stack while running on it */
  110. //  free(uarg->uspace_stack);
  111. //  free(uarg);
  112.  
  113.     /* If there is a manager, destroy it */
  114.     async_destroy_manager();
  115.     fibril_teardown(f);
  116.  
  117.     thread_exit(0);
  118. }
  119.  
  120. /** Create userspace thread.
  121.  *
  122.  * This function creates new userspace thread and allocates userspace
  123.  * stack and userspace argument structure for it.
  124.  *
  125.  * @param function Function implementing the thread.
  126.  * @param arg Argument to be passed to thread.
  127.  * @param name Symbolic name of the thread.
  128.  * @param tid Thread ID of the newly created thread.
  129.  *
  130.  * @return Zero on success or a code from @ref errno.h on failure.
  131.  */
  132. int thread_create(void (* function)(void *), void *arg, char *name,
  133.     thread_id_t *tid)
  134. {
  135.     char *stack;
  136.     uspace_arg_t *uarg;
  137.     int rc;
  138.  
  139.     stack = (char *) malloc(getpagesize() * THREAD_INITIAL_STACK_PAGES_NO);
  140.     if (!stack)
  141.         return -1;
  142.        
  143.     uarg = (uspace_arg_t *) malloc(sizeof(uspace_arg_t));
  144.     if (!uarg) {
  145.         free(stack);
  146.         return -1;
  147.     }
  148.    
  149.     uarg->uspace_entry = (void *) FADDR(__thread_entry);
  150.     uarg->uspace_stack = (void *) stack;
  151.     uarg->uspace_thread_function = function;
  152.     uarg->uspace_thread_arg = arg;
  153.     uarg->uspace_uarg = uarg;
  154.    
  155.     rc = __SYSCALL3(SYS_THREAD_CREATE, (sysarg_t) uarg, (sysarg_t) name,
  156.         (sysarg_t) tid);
  157.    
  158.     if (rc) {
  159.         /*
  160.          * Failed to create a new thread.
  161.          * Free up the allocated structures.
  162.          */
  163.         free(uarg);
  164.         free(stack);
  165.     }
  166.  
  167.     return rc;
  168. }
  169.  
  170. /** Terminate current thread.
  171.  *
  172.  * @param status Exit status. Currently not used.
  173.  */
  174. void thread_exit(int status)
  175. {
  176.     __SYSCALL1(SYS_THREAD_EXIT, (sysarg_t) status);
  177. }
  178.  
  179. /** Detach thread.
  180.  *
  181.  * Currently not implemented.
  182.  *
  183.  * @param thread TID.
  184.  */
  185. void thread_detach(thread_id_t thread)
  186. {
  187. }
  188.  
  189. /** Join thread.
  190.  *
  191.  * Currently not implemented.
  192.  *
  193.  * @param thread TID.
  194.  *
  195.  * @return Thread exit status.
  196.  */
  197. int thread_join(thread_id_t thread)
  198. {
  199. }
  200.  
  201. /** Get current thread ID.
  202.  *
  203.  * @return Current thread ID.
  204.  */
  205. thread_id_t thread_get_id(void)
  206. {
  207.     thread_id_t thread_id;
  208.  
  209.     (void) __SYSCALL1(SYS_THREAD_GET_ID, (sysarg_t) &thread_id);
  210.  
  211.     return thread_id;
  212. }
  213.  
  214. /** @}
  215.  */
  216.