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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. #include <thread.h>
  30. #include <libc.h>
  31. #include <stdlib.h>
  32. #include <arch/faddr.h>
  33. #include <kernel/proc/uarg.h>
  34. #include <psthread.h>
  35.  
  36. #include <stdio.h>
  37. void * __make_tls(void)
  38. {
  39.     psthread_data_t *pt;
  40.  
  41.     pt = malloc(sizeof(psthread_data_t));
  42.     pt->self = pt;
  43.  
  44.     return pt;
  45. }
  46.  
  47. void __free_tls(void *tls)
  48. {
  49.     free(tls);
  50. }
  51.  
  52. /** Main thread function.
  53.  *
  54.  * This function is called from __thread_entry() and is used
  55.  * to call the thread's implementing function and perform cleanup
  56.  * and exit when thread returns back. Do not call this function
  57.  * directly.
  58.  *
  59.  * @param uarg Pointer to userspace argument structure.
  60.  */
  61. void __thread_main(uspace_arg_t *uarg)
  62. {
  63.     /* This should initialize the area according to TLS specicification */
  64.     __tls_set(__make_tls());
  65.  
  66.     uarg->uspace_thread_function(uarg->uspace_thread_arg);
  67.     free(uarg->uspace_stack);
  68.     free(uarg);
  69.  
  70.     __free_tls(__tls_get());
  71.  
  72.     thread_exit(0);
  73. }
  74.  
  75. /** Create userspace thread.
  76.  *
  77.  * This function creates new userspace thread and allocates userspace
  78.  * stack and userspace argument structure for it.
  79.  *
  80.  * @param function Function implementing the thread.
  81.  * @param arg Argument to be passed to thread.
  82.  * @param name Symbolic name of the thread.
  83.  *
  84.  * @param TID of the new thread on success or -1 on failure.
  85.  */
  86. int thread_create(void (* function)(void *), void *arg, char *name)
  87. {
  88.     char *stack;
  89.     uspace_arg_t *uarg;
  90.  
  91.     stack = (char *) malloc(getpagesize());
  92.     if (!stack)
  93.         return -1;
  94.        
  95.     uarg = (uspace_arg_t *) malloc(sizeof(uspace_arg_t));
  96.     if (!uarg) {
  97.         free(stack);
  98.         return -1;
  99.     }
  100.    
  101.     uarg->uspace_entry = (void *) FADDR(__thread_entry);
  102.     uarg->uspace_stack = (void *) stack;
  103.     uarg->uspace_thread_function = function;
  104.     uarg->uspace_thread_arg = arg;
  105.     uarg->uspace_uarg = uarg;
  106.    
  107.     return __SYSCALL2(SYS_THREAD_CREATE, (sysarg_t) uarg, (sysarg_t) name);
  108. }
  109.  
  110. /** Terminate current thread.
  111.  *
  112.  * @param stat Exit status. Currently not used.
  113.  */
  114. void thread_exit(int status)
  115. {
  116.     __SYSCALL1(SYS_THREAD_EXIT, (sysarg_t) status);
  117. }
  118.