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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.  
  35. /** Main thread function.
  36.  *
  37.  * This function is called from __thread_entry() and is used
  38.  * to call the thread's implementing function and perform cleanup
  39.  * and exit when thread returns back. Do not call this function
  40.  * directly.
  41.  *
  42.  * @param uarg Pointer to userspace argument structure.
  43.  */
  44. void thread_main(uspace_arg_t *uarg)
  45. {
  46.     uarg->uspace_thread_function(uarg->uspace_thread_arg);
  47.     free(uarg->uspace_stack);
  48.     free(uarg);
  49.     thread_exit(0);
  50. }
  51.  
  52. /** Create userspace thread.
  53.  *
  54.  * This function creates new userspace thread and allocates userspace
  55.  * stack and userspace argument structure for it.
  56.  *
  57.  * @param function Function implementing the thread.
  58.  * @param arg Argument to be passed to thread.
  59.  * @param name Symbolic name of the thread.
  60.  *
  61.  * @param TID of the new thread on success or -1 on failure.
  62.  */
  63. int thread_create(void (* function)(void *), void *arg, char *name)
  64. {
  65.     char *stack;
  66.     uspace_arg_t *uarg;
  67.  
  68.     stack = (char *) malloc(getpagesize());
  69.     if (!stack)
  70.         return -1;
  71.        
  72.     uarg = (uspace_arg_t *) malloc(sizeof(uspace_arg_t));
  73.     if (!uarg) {
  74.         free(stack);
  75.         return -1;
  76.     }
  77.    
  78.     uarg->uspace_entry = (void *) FADDR(__thread_entry);
  79.     uarg->uspace_stack = (void *) stack;
  80.     uarg->uspace_thread_function = function;
  81.     uarg->uspace_thread_arg = arg;
  82.     uarg->uspace_uarg = uarg;
  83.    
  84.     return __SYSCALL2(SYS_THREAD_CREATE, (sysarg_t) uarg, (sysarg_t) name);
  85. }
  86.  
  87. /** Terminate current thread.
  88.  *
  89.  * @param stat Exit status. Currently not used.
  90.  */
  91. void thread_exit(int status)
  92. {
  93.     __SYSCALL1(SYS_THREAD_EXIT, (sysarg_t) status);
  94. }
  95.