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| Rev | Author | Line No. | Line |
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| 1113 | palkovsky | 1 | /* |
| 2 | * Copyright (C) 2006 Ondrej Palkovsky |
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| 3 | * All rights reserved. |
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| 4 | * |
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| 5 | * Redistribution and use in source and binary forms, with or without |
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| 6 | * modification, are permitted provided that the following conditions |
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| 7 | * are met: |
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| 8 | * |
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| 9 | * - Redistributions of source code must retain the above copyright |
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| 10 | * notice, this list of conditions and the following disclaimer. |
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| 11 | * - Redistributions in binary form must reproduce the above copyright |
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| 12 | * notice, this list of conditions and the following disclaimer in the |
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| 13 | * documentation and/or other materials provided with the distribution. |
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| 14 | * - The name of the author may not be used to endorse or promote products |
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| 15 | * derived from this software without specific prior written permission. |
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| 16 | * |
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 27 | */ |
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| 28 | |||
| 29 | #include <libadt/list.h> |
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| 30 | #include <psthread.h> |
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| 31 | #include <malloc.h> |
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| 32 | #include <unistd.h> |
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| 33 | #include <thread.h> |
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| 34 | #include <stdio.h> |
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| 1125 | jermar | 35 | #include <kernel/arch/faddr.h> |
| 1113 | palkovsky | 36 | |
| 37 | static LIST_INITIALIZE(ready_list); |
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| 38 | |||
| 1128 | jermar | 39 | static void psthread_exit(void) __attribute__ ((noinline)); |
| 40 | static void psthread_main(void); |
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| 1125 | jermar | 41 | |
| 1129 | palkovsky | 42 | /** Setup PSthread information into TCB structure */ |
| 43 | psthread_data_t * psthread_setup(tcb_t *tcb) |
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| 44 | { |
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| 45 | psthread_data_t *pt; |
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| 46 | |||
| 47 | pt = malloc(sizeof(*pt)); |
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| 48 | if (!pt) { |
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| 49 | return NULL; |
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| 50 | } |
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| 51 | |||
| 52 | tcb->pst_data = pt; |
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| 53 | pt->tcb = tcb; |
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| 54 | |||
| 55 | return pt; |
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| 56 | } |
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| 57 | |||
| 58 | void psthread_teardown(psthread_data_t *pt) |
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| 59 | { |
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| 60 | free(pt); |
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| 61 | } |
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| 62 | |||
| 1128 | jermar | 63 | /** Function to preempt to other pseudo thread without adding |
| 64 | * currently running pseudo thread to ready_list. |
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| 1113 | palkovsky | 65 | */ |
| 1128 | jermar | 66 | void psthread_exit(void) |
| 1113 | palkovsky | 67 | { |
| 68 | psthread_data_t *pt; |
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| 69 | |||
| 70 | if (list_empty(&ready_list)) { |
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| 71 | /* Wait on IPC queue etc... */ |
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| 72 | printf("Cannot exit!!!\n"); |
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| 73 | _exit(0); |
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| 74 | } |
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| 1128 | jermar | 75 | pt = list_get_instance(ready_list.next, psthread_data_t, link); |
| 76 | list_remove(&pt->link); |
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| 1113 | palkovsky | 77 | context_restore(&pt->ctx); |
| 78 | } |
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| 79 | |||
| 80 | /** Function that is called on entry to new uspace thread */ |
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| 1128 | jermar | 81 | void psthread_main(void) |
| 1113 | palkovsky | 82 | { |
| 1129 | palkovsky | 83 | psthread_data_t *pt = __tcb_get()->pst_data; |
| 84 | |||
| 1113 | palkovsky | 85 | pt->retval = pt->func(pt->arg); |
| 86 | |||
| 87 | pt->finished = 1; |
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| 88 | if (pt->waiter) |
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| 1128 | jermar | 89 | list_append(&pt->waiter->link, &ready_list); |
| 1113 | palkovsky | 90 | |
| 1128 | jermar | 91 | psthread_exit(); |
| 1113 | palkovsky | 92 | } |
| 93 | |||
| 1128 | jermar | 94 | /** Schedule next userspace pseudo thread. |
| 95 | * |
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| 96 | * @return 0 if there is no ready pseudo thread, 1 otherwise. |
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| 97 | */ |
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| 98 | int psthread_schedule_next(void) |
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| 1113 | palkovsky | 99 | { |
| 100 | psthread_data_t *pt; |
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| 101 | |||
| 102 | if (list_empty(&ready_list)) |
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| 103 | return 0; |
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| 104 | |||
| 1129 | palkovsky | 105 | pt = __tcb_get()->pst_data; |
| 1128 | jermar | 106 | if (!context_save(&pt->ctx)) |
| 1113 | palkovsky | 107 | return 1; |
| 108 | |||
| 1128 | jermar | 109 | list_append(&pt->link, &ready_list); |
| 110 | pt = list_get_instance(ready_list.next, psthread_data_t, link); |
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| 111 | list_remove(&pt->link); |
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| 1113 | palkovsky | 112 | |
| 113 | context_restore(&pt->ctx); |
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| 114 | } |
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| 115 | |||
| 1128 | jermar | 116 | /** Wait for uspace pseudo thread to finish. |
| 117 | * |
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| 118 | * @param psthrid Pseudo thread to wait for. |
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| 119 | * |
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| 120 | * @return Value returned by the finished thread. |
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| 121 | */ |
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| 122 | int psthread_join(pstid_t psthrid) |
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| 1113 | palkovsky | 123 | { |
| 1125 | jermar | 124 | volatile psthread_data_t *pt, *mypt; |
| 125 | volatile int retval; |
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| 1113 | palkovsky | 126 | |
| 127 | /* Handle psthrid = Kernel address -> it is wait for call */ |
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| 128 | pt = (psthread_data_t *) psthrid; |
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| 129 | |||
| 130 | if (!pt->finished) { |
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| 1129 | palkovsky | 131 | mypt = __tcb_get()->pst_data; |
| 1125 | jermar | 132 | if (context_save(&((psthread_data_t *) mypt)->ctx)) { |
| 133 | pt->waiter = (psthread_data_t *) mypt; |
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| 1128 | jermar | 134 | psthread_exit(); |
| 1113 | palkovsky | 135 | } |
| 136 | } |
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| 137 | retval = pt->retval; |
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| 138 | |||
| 139 | free(pt->stack); |
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| 1129 | palkovsky | 140 | __free_tls(pt->tcb); |
| 141 | psthread_teardown((void *)pt); |
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| 1113 | palkovsky | 142 | |
| 143 | return retval; |
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| 144 | } |
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| 145 | |||
| 146 | /** |
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| 1128 | jermar | 147 | * Create a userspace thread and append it to ready list. |
| 1113 | palkovsky | 148 | * |
| 1128 | jermar | 149 | * @param func Pseudo thread function. |
| 150 | * @param arg Argument to pass to func. |
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| 151 | * |
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| 152 | * @return 0 on failure, TLS of the new pseudo thread. |
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| 1113 | palkovsky | 153 | */ |
| 154 | pstid_t psthread_create(int (*func)(void *), void *arg) |
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| 155 | { |
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| 156 | psthread_data_t *pt; |
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| 1129 | palkovsky | 157 | tcb_t *tcb; |
| 1113 | palkovsky | 158 | |
| 1129 | palkovsky | 159 | tcb = __make_tls(); |
| 160 | if (!tcb) |
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| 161 | return 0; |
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| 162 | |||
| 163 | pt = psthread_setup(tcb); |
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| 164 | if (!pt) { |
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| 165 | __free_tls(tcb); |
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| 166 | return 0; |
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| 167 | } |
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| 1113 | palkovsky | 168 | pt->stack = (char *) malloc(getpagesize()); |
| 169 | |||
| 170 | if (!pt->stack) { |
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| 1129 | palkovsky | 171 | __free_tls(tcb); |
| 172 | psthread_teardown(pt); |
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| 1113 | palkovsky | 173 | return 0; |
| 174 | } |
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| 175 | |||
| 176 | pt->arg= arg; |
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| 177 | pt->func = func; |
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| 178 | pt->finished = 0; |
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| 179 | pt->waiter = NULL; |
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| 180 | |||
| 181 | context_save(&pt->ctx); |
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| 1129 | palkovsky | 182 | context_set(&pt->ctx, FADDR(psthread_main), pt->stack, getpagesize(), |
| 183 | tcb); |
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| 1113 | palkovsky | 184 | |
| 1128 | jermar | 185 | list_append(&pt->link, &ready_list); |
| 1113 | palkovsky | 186 | |
| 187 | return (pstid_t )pt; |
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| 188 | } |