[3770] | 1 | /* $Id: thread.c 3770 2012-03-15 20:02:46Z bird $ */
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| 2 | /** @file
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| 3 | *
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| 4 | * kUNIX - Thread Management.
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| 5 | *
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| 6 | * Copyright (c) 2006 knut st. osmundsen <bird-src-spam@anduin.net>
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| 7 | *
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| 8 | *
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| 9 | * This file is part of kLIBC.
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| 10 | *
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| 11 | * kLIBC is free software; you can redistribute it and/or modify
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| 12 | * it under the terms of the GNU Lesser General Public License as published
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| 13 | * by the Free Software Foundation; either version 2 of the License, or
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| 14 | * (at your option) any later version.
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| 15 | *
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| 16 | * kLIBC is distributed in the hope that it will be useful,
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| 17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 19 | * GNU Lesser General Public License for more details.
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| 20 | *
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| 21 | * You should have received a copy of the GNU Lesser General Public License
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| 22 | * along with kLIBC; if not, write to the Free Software
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| 23 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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| 24 | *
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| 25 | */
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| 26 |
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| 27 | /*******************************************************************************
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| 28 | * Header Files *
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| 29 | *******************************************************************************/
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| 30 | #define __LIBC_LOG_GROUP __LIBC_LOG_GRP_BACK_THREAD
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| 31 | #include "kNIX.h"
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| 32 |
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| 33 |
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| 34 | /*******************************************************************************
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| 35 | * Global Variables *
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| 36 | *******************************************************************************/
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| 37 | /** Preallocated thread structure. */
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| 38 | static __LIBC_THREAD gPreAllocThrd;
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| 39 | /** Flags whether or not gPreAllocThrd is used. */
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| 40 | static volatile int gfPreAllocThrd;
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| 41 |
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| 42 | /** Mutex for the thread database. */
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| 43 | static _fmutex gmtxThrdDB;
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| 44 | /** Thread database. (Protected gmtxThrdDB.) */
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| 45 | static __LIBC_PTHREAD gpThrdDB;
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| 46 | /** Number of threads in the thread database. (Protected gmtxThrdDB.) */
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| 47 | static unsigned gcThrdDBEntries;
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| 48 | /** Zombie thread database. (Protected gmtxThrdDB.) */
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| 49 | static __LIBC_PTHREAD gpThrdDBZombies;
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| 50 | /** Number of threads in the zombie thread database. (Protected gmtxThrdDB.) */
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| 51 | static unsigned gcThrdDBZombies;
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| 52 |
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| 53 | /** Head of the thread termination callback list. */
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| 54 | static __LIBC_PTHREADTERMCBREGREC gpTermHead;
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| 55 | /** Tail of the thread termination callback list. */
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| 56 | static __LIBC_PTHREADTERMCBREGREC gpTermTail;
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| 57 | /** List protection semaphore (spinlock sort). */
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| 58 | static _smutex gsmtxTerm;
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| 59 |
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| 60 |
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| 61 | /**
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| 62 | * Initializes the thread manager.
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| 63 | *
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| 64 | * @returns 0 on success.
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| 65 | * @returns negated errno on failure.
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| 66 | */
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| 67 | int __libc_back_threadInitManager(void)
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| 68 | {
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| 69 | LIBCLOG_ENTER("\n");
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| 70 |
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| 71 | /** @todo rewrite to use a read/write semaphore, not mutex. */
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| 72 | int rc = _fmutex_create2(&gmtxThrdDB, 0, "LIBC Thread DB Mutex");
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| 73 | if (rc)
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| 74 | LIBCLOG_ERROR_RETURN_INT(rc);
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| 75 |
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| 76 | LIBCLOG_RETURN_INT(0);
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| 77 | }
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| 78 |
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| 79 |
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| 80 | /**
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| 81 | * Internal wrapper for the various OS interfaces for
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| 82 | * setting the thread pointer.
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| 83 | *
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| 84 | * @param pThrd The new thread pointer.
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| 85 | */
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| 86 | static inline void threadSetPtr(__LIBC_PTHREAD pThrd)
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| 87 | {
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| 88 | #ifdef __OS2__
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| 89 | *__libc_gpTLS = pThrd;
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| 90 | #elif defined(__NT__)
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| 91 | fibSetLibcThread(pThrd);
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| 92 | #else
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| 93 | # error "Port me!"
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| 94 | #endif
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| 95 | }
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| 96 |
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| 97 |
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| 98 | /**
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| 99 | * Initialize a thread structure.
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| 100 | *
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| 101 | * @param pThrd Pointer to the thread structure which is to be initialized.
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| 102 | * @param pParentThrd Pointer to the thread structure for the parent thread.
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| 103 | * If NULL and thread id is 1 then inherit from parent process.
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| 104 | * If NULL and thread is not null or no record of parent then
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| 105 | * use defaults.
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| 106 | */
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| 107 | static void threadInit(__LIBC_PTHREAD pThrd, const __LIBC_PTHREAD pParentThrd)
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| 108 | {
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| 109 | bzero(pThrd, sizeof(*pThrd));
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| 110 | pThrd->cRefs = 1;
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| 111 | __libc_Back_threadInit(pThrd, pParentThrd);
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| 112 | }
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| 113 |
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| 114 |
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| 115 | void __libc_threadUse(__LIBC_PTHREAD pThrd)
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| 116 | {
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| 117 | LIBCLOG_ENTER("pThrd=%p\n", (void *)pThrd);
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| 118 | int rc;
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| 119 |
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| 120 | /*
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| 121 | * Check that pThrd isn't already in use and set gpTLS to point at pThrd.
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| 122 | * (*gpTLS might already be pointing to a temporary structure.)
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| 123 | */
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| 124 | assert(!pThrd->pNext && !pThrd->tid);
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| 125 | threadSetPtr(pThrd);
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| 126 |
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| 127 | /*
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| 128 | * Set the thread id of this thread.
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| 129 | */
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| 130 | pThrd->tid = _gettid();
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| 131 |
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| 132 | /*
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| 133 | * Insert this thread into the thread database.
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| 134 | * Note that there might be a dead thread by the same id in the database.
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| 135 | * This have to be removed of course.
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| 136 | */
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| 137 | /** @todo rewrite to use a read/write semaphore, not mutex. */
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| 138 | if (gmtxThrdDB.fs == _FMS_UNINIT)
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| 139 | _fmutex_create2(&gmtxThrdDB, 0, "LIBC Thread DB Mutex");
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| 140 |
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| 141 | rc = _fmutex_request(&gmtxThrdDB, 0);
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| 142 | if (!rc)
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| 143 | {
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| 144 | /* Remove any zombie threads. */
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| 145 | __LIBC_PTHREAD pPrev = NULL;
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| 146 | __LIBC_PTHREAD p = gpThrdDB;
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| 147 | while (p)
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| 148 | {
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| 149 | if (p->tid == pThrd->tid)
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| 150 | {
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| 151 | /* remove it and place it in the zombie list */
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| 152 | __LIBC_PTHREAD pNext = p->pNext;
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| 153 | if (pPrev)
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| 154 | pPrev->pNext = pNext;
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| 155 | else
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| 156 | gpThrdDB = pNext;
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| 157 | gcThrdDBEntries--;
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| 158 |
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| 159 | p->pNext = gpThrdDBZombies;
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| 160 | gpThrdDBZombies = p;
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| 161 | gcThrdDBZombies++;
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| 162 | p = pNext;
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| 163 | /* paranoid as always, we continue scanning the entire list. */
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| 164 | }
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| 165 | else
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| 166 | {
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| 167 | /* next */
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| 168 | pPrev = p;
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| 169 | p = p->pNext;
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| 170 | }
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| 171 | }
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| 172 |
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| 173 | /* Insert it */
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| 174 | pThrd->pNext = gpThrdDB;
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| 175 | gpThrdDB = pThrd;
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| 176 | gcThrdDBEntries++;
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| 177 |
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| 178 | _fmutex_release(&gmtxThrdDB);
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| 179 | LIBCLOG_RETURN_VOID();
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| 180 | }
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| 181 |
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| 182 | LIBCLOG_ERROR_RETURN_VOID();
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| 183 | }
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| 184 |
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| 185 |
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| 186 | __LIBC_PTHREAD __libc_threadCurrentSlow(void)
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| 187 | {
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| 188 | LIBCLOG_ENTER("\n");
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| 189 | if (!__libc_threadCurrentNoAuto())
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| 190 | {
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| 191 | /*
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| 192 | * Setup a temporary thread block on the stack so _hmalloc()
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| 193 | * can't end up calling us recursivly if something goes wrong.
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| 194 | */
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| 195 | __LIBC_THREAD Thrd;
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| 196 | threadInit(&Thrd, NULL);
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| 197 | threadSetPtr(&Thrd);
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| 198 |
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| 199 | __LIBC_PTHREAD pThrd;
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| 200 | if (!__lxchg(&gfPreAllocThrd, 1))
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| 201 | pThrd = &gPreAllocThrd;
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| 202 | else
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| 203 | {
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| 204 | pThrd = _hmalloc(sizeof(__LIBC_THREAD));
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| 205 | assert(pThrd); /* deep, deep, deep, shit. abort the process in a controlled manner... */
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| 206 | }
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| 207 | *pThrd = Thrd;
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| 208 |
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| 209 | __libc_threadUse(pThrd);
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| 210 | LIBCLOG_MSG("Created thread block %p\n", (void*)pThrd);
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| 211 | }
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| 212 |
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| 213 | LIBCLOG_RETURN_P(__libc_threadCurrentNoAuto());
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| 214 | }
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| 215 |
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| 216 |
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| 217 | __LIBC_PTHREAD __libc_threadAlloc(void)
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| 218 | {
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| 219 | LIBCLOG_ENTER("\n");
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| 220 |
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| 221 | /*
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| 222 | * No need to use the pre allocated here since the current thread will
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| 223 | * most likely be using that one!
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| 224 | */
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| 225 | __LIBC_PTHREAD pThrd = _hmalloc(sizeof(__LIBC_THREAD));
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| 226 | if (pThrd)
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| 227 | {
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| 228 | threadInit(pThrd, __libc_threadCurrentNoAuto());
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| 229 | LIBCLOG_RETURN_P(pThrd);
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| 230 | }
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| 231 | LIBCLOG_ERROR_RETURN_P(pThrd);
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| 232 | }
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| 233 |
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| 234 |
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| 235 | void __libc_threadDereference(__LIBC_PTHREAD pThrd)
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| 236 | {
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| 237 | LIBCLOG_ENTER("pThrd=%p (tid=%d)\n", (void *)pThrd, pThrd->tid);
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| 238 |
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| 239 | /*
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| 240 | * Take owner ship of the DB semaphore.
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| 241 | */
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| 242 | _fmutex_request(&gmtxThrdDB, 0);
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| 243 | if (pThrd->cRefs)
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| 244 | pThrd->cRefs--;
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| 245 | if (pThrd->cRefs)
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| 246 | {
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| 247 | #ifdef DEBUG_LOGGING
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| 248 | unsigned cRefs = pThrd->cRefs;
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| 249 | #endif
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| 250 | _fmutex_release(&gmtxThrdDB);
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| 251 | LIBCLOG_RETURN_MSG_VOID("ret void. cRefs=%d\n", cRefs);
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| 252 | }
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| 253 | LIBCLOG_MSG("unlinking and disposing the thread.\n");
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| 254 |
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| 255 | /*
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| 256 | * Thread is dead, unlink it.
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| 257 | */
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| 258 | if (pThrd->tid)
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| 259 | {
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| 260 | if (pThrd == gpThrdDB)
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| 261 | {
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| 262 | gpThrdDB = pThrd->pNext;
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| 263 | gcThrdDBEntries--;
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| 264 | }
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| 265 | else
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| 266 | {
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| 267 | __LIBC_PTHREAD p;
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| 268 | for (p = gpThrdDB; p->pNext; p = p->pNext)
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| 269 | if (p->pNext == pThrd)
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| 270 | {
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| 271 | p->pNext = pThrd->pNext;
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| 272 | gcThrdDBEntries--;
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| 273 | p = NULL;
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| 274 | break;
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| 275 | }
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| 276 |
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| 277 | /*
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| 278 | * Not found? search zombie DB.
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| 279 | */
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| 280 | if (p)
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| 281 | {
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| 282 | if (gpThrdDBZombies == pThrd)
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| 283 | {
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| 284 | gpThrdDBZombies = pThrd->pNext;
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| 285 | gcThrdDBZombies--;
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| 286 | p = NULL;
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| 287 | }
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| 288 | else
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| 289 | {
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| 290 | for (p = gpThrdDBZombies; p->pNext; p = p->pNext)
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| 291 | if (p->pNext == pThrd)
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| 292 | {
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| 293 | p->pNext = pThrd->pNext;
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| 294 | gcThrdDBZombies--;
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| 295 | p = NULL;
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| 296 | break;
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| 297 | }
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| 298 | }
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| 299 | }
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| 300 |
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| 301 | /*
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| 302 | * Did we succeed in finding it? If not don't dispose of the the thread!
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| 303 | */
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| 304 | if (p)
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| 305 | {
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| 306 | assert(!p);
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| 307 | pThrd = NULL;
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| 308 | }
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| 309 | }
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| 310 | }
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| 311 |
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| 312 | _fmutex_release(&gmtxThrdDB);
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| 313 |
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| 314 |
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| 315 | /*
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| 316 | * Dispose of the thread
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| 317 | */
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| 318 | if (pThrd)
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| 319 | {
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| 320 | /*
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| 321 | * Clean up members.
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| 322 | */
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| 323 | __libc_Back_threadCleanup(pThrd);
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| 324 |
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| 325 | /*
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| 326 | * Clear the TLS if it's for the current thread.
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| 327 | */
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| 328 | if (__libc_threadCurrentNoAuto() == pThrd)
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| 329 | threadSetPtr(NULL);
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| 330 |
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| 331 | /*
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| 332 | * Release storage.
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| 333 | */
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| 334 | if (pThrd != &gPreAllocThrd)
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| 335 | free(pThrd);
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| 336 | else
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| 337 | __lxchg(&gfPreAllocThrd, 0);
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| 338 | LIBCLOG_RETURN_MSG_VOID("ret (gcThrdDBEntires=%d gcThrdDBZombies=%d)\n", gcThrdDBEntries, gcThrdDBZombies);
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| 339 | }
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| 340 | LIBCLOG_ERROR_RETURN_MSG_VOID("ret (gcThrdDBEntires=%d gcThrdDBZombies=%d)\n", gcThrdDBEntries, gcThrdDBZombies);
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| 341 | }
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| 342 |
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| 343 |
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| 344 | __LIBC_PTHREAD __libc_threadLookup(unsigned tid)
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| 345 | {
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| 346 | LIBCLOG_ENTER("tid=%d\n", tid);
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| 347 | int rc;
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| 348 | __LIBC_PTHREAD pThrd;
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| 349 |
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| 350 | /* can't search something which isn't there. */
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| 351 | if (gmtxThrdDB.fs == _FMS_UNINIT)
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| 352 | LIBCLOG_ERROR_RETURN_P(NULL);
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| 353 |
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| 354 | rc = _fmutex_request(&gmtxThrdDB, 0);
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| 355 | if (rc)
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| 356 | LIBCLOG_ERROR_RETURN(NULL, "ret NULL - fmutex f**ked. rc=%d\n", rc);
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| 357 |
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| 358 | for (pThrd = gpThrdDB; pThrd; pThrd = pThrd->pNext)
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| 359 | if (pThrd->tid == tid)
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| 360 | {
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| 361 | pThrd->cRefs++;
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| 362 | break;
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| 363 | }
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| 364 |
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| 365 | _fmutex_release(&gmtxThrdDB);
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| 366 | if (pThrd)
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| 367 | LIBCLOG_RETURN_P(pThrd);
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| 368 | LIBCLOG_ERROR_RETURN_P(pThrd);
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| 369 | }
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| 370 |
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| 371 |
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| 372 | __LIBC_PTHREAD __libc_threadLookup2(int (pfnCallback)(__LIBC_PTHREAD pCur, __LIBC_PTHREAD pBest, void *pvParam), void *pvParam)
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| 373 | {
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| 374 | LIBCLOG_ENTER("pfnCallback=%p pvParam=%p\n", (void *)pfnCallback, pvParam);
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| 375 | int rc;
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| 376 | __LIBC_PTHREAD pThrd;
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| 377 | __LIBC_PTHREAD pBest = NULL;
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| 378 |
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| 379 | /* can't search something which isn't there. */
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| 380 | if (gmtxThrdDB.fs == _FMS_UNINIT)
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| 381 | LIBCLOG_ERROR_RETURN_P(NULL);
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| 382 |
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| 383 | rc = _fmutex_request(&gmtxThrdDB, 0);
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| 384 | if (rc)
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| 385 | LIBCLOG_ERROR_RETURN(NULL, "ret NULL - fmutex f**ked. rc=%d\n", rc);
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| 386 |
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| 387 | for (pThrd = gpThrdDB; pThrd; pThrd = pThrd->pNext)
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| 388 | {
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| 389 | rc = pfnCallback(pThrd, pBest, pvParam);
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| 390 | if (rc == 0)
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| 391 | continue;
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| 392 | else if (rc == 1)
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| 393 | {
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| 394 | pBest = pThrd;
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| 395 | continue;
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| 396 | }
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| 397 | else if (rc == 2)
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| 398 | {
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| 399 | pBest = pThrd;
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| 400 | break;
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| 401 | }
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| 402 | else if (rc == -1)
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| 403 | break;
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| 404 | else
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| 405 | {
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| 406 | LIBC_ASSERTM_FAILED("Callback returned %d, allowed values are 2, 1, 0 and -1!\n", rc);
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| 407 | break;
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| 408 | }
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| 409 | }
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| 410 |
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| 411 | if (pBest)
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| 412 | pBest->cRefs++;
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| 413 |
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| 414 | _fmutex_release(&gmtxThrdDB);
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| 415 |
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| 416 | if (pBest)
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| 417 | LIBCLOG_RETURN_MSG(pBest, "ret %p (tid=%d)\n", (void *)pBest, pBest->tid);
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| 418 | LIBCLOG_ERROR_RETURN(pBest, "ret NULL\n");
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| 419 | }
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| 420 |
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| 421 |
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| 422 |
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| 423 | int __libc_threadEnum(int (pfnCallback)(__LIBC_PTHREAD pCur, void *pvParam), void *pvParam)
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| 424 | {
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| 425 | LIBCLOG_ENTER("pfnCallback=%p pvParam=%p\n", (void *)pfnCallback, pvParam);
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| 426 | int rc;
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| 427 | __LIBC_PTHREAD pThrd;
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| 428 |
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| 429 | /* can't search something which isn't there. */
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| 430 | if (gmtxThrdDB.fs == _FMS_UNINIT)
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| 431 | LIBCLOG_ERROR_RETURN_P(NULL);
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| 432 |
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| 433 | rc = _fmutex_request(&gmtxThrdDB, 0);
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| 434 | if (rc)
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| 435 | LIBCLOG_ERROR_RETURN(NULL, "ret NULL - fmutex f**ked. rc=%d\n", rc);
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| 436 |
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| 437 | for (pThrd = gpThrdDB; pThrd; pThrd = pThrd->pNext)
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| 438 | {
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| 439 | rc = pfnCallback(pThrd, pvParam);
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| 440 | if (rc == 0)
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| 441 | continue;
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| 442 | else if (rc == -1)
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| 443 | break;
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| 444 | else
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| 445 | {
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| 446 | LIBC_ASSERTM_FAILED("Callback returned %d, allowed values are 0 and -1!\n", rc);
|
---|
| 447 | break;
|
---|
| 448 | }
|
---|
| 449 | }
|
---|
| 450 |
|
---|
| 451 | _fmutex_release(&gmtxThrdDB);
|
---|
| 452 |
|
---|
| 453 | LIBCLOG_RETURN_INT(rc);
|
---|
| 454 | }
|
---|
| 455 |
|
---|
| 456 | int __libc_ThreadRegisterTermCallback(__LIBC_PTHREADTERMCBREGREC pRegRec)
|
---|
| 457 | {
|
---|
| 458 | LIBCLOG_ENTER("pRegRec=%p:{.pNext=%p, .fFlags=%u, .pfnCallback=%p}\n", (void *)pRegRec,
|
---|
| 459 | pRegRec ? (void *)pRegRec->pNext : NULL,
|
---|
| 460 | pRegRec ? pRegRec->fFlags : 0,
|
---|
| 461 | pRegRec ? (void *)pRegRec->pfnCallback : NULL);
|
---|
| 462 |
|
---|
| 463 | /*
|
---|
| 464 | * Validate input.
|
---|
| 465 | */
|
---|
| 466 | if (pRegRec->pNext)
|
---|
| 467 | {
|
---|
| 468 | errno = EINVAL;
|
---|
| 469 | LIBCLOG_ERROR_RETURN(-1, "ret -1 - pNext must be NULL not %p\n", (void * )pRegRec->pNext);
|
---|
| 470 | }
|
---|
| 471 | if (!pRegRec->pfnCallback)
|
---|
| 472 | {
|
---|
| 473 | errno = EINVAL;
|
---|
| 474 | LIBCLOG_ERROR_RETURN(-1, "ret -1 - pfnCallback not be NULL\n");
|
---|
| 475 | }
|
---|
| 476 | if (pRegRec->fFlags)
|
---|
| 477 | {
|
---|
| 478 | errno = EINVAL;
|
---|
| 479 | LIBCLOG_ERROR_RETURN(-1, "ret -1 - fFlags must be ZERO not %u\n", pRegRec->fFlags);
|
---|
| 480 | }
|
---|
| 481 |
|
---|
| 482 | /*
|
---|
| 483 | * Insert into the LIFO.
|
---|
| 484 | */
|
---|
| 485 | _smutex_request(&gsmtxTerm);
|
---|
| 486 | if ( !pRegRec->pNext
|
---|
| 487 | && pRegRec != gpTermTail)
|
---|
| 488 | {
|
---|
| 489 | pRegRec->pNext = gpTermTail;
|
---|
| 490 | gpTermTail = pRegRec;
|
---|
| 491 | if (!gpTermHead)
|
---|
| 492 | gpTermHead = pRegRec;
|
---|
| 493 | _smutex_release(&gsmtxTerm);
|
---|
| 494 | LIBCLOG_RETURN_INT(0);
|
---|
| 495 | }
|
---|
| 496 | else
|
---|
| 497 | {
|
---|
| 498 | _smutex_release(&gsmtxTerm);
|
---|
| 499 | errno = EEXIST;
|
---|
| 500 | LIBCLOG_ERROR_RETURN(-1, "ret -1 - Double registration of %p\n", (void *)pRegRec);
|
---|
| 501 | }
|
---|
| 502 | }
|
---|
| 503 |
|
---|
| 504 |
|
---|
| 505 | void __libc_threadTermination(unsigned fFlags)
|
---|
| 506 | {
|
---|
| 507 | LIBCLOG_ENTER("fFlags=%u\n", fFlags);
|
---|
| 508 | __LIBC_PTHREADTERMCBREGREC pCur;
|
---|
| 509 | __LIBC_PTHREADTERMCBREGREC pTail;
|
---|
| 510 |
|
---|
| 511 | /*
|
---|
| 512 | * We'll need to do this in a safe manner.
|
---|
| 513 | *
|
---|
| 514 | * ASSUME no removal of records.
|
---|
| 515 | * Thus we just pick the head and tail record and walk them.
|
---|
| 516 | */
|
---|
| 517 | _smutex_request(&gsmtxTerm);
|
---|
| 518 | pTail = gpTermTail;
|
---|
| 519 | pCur = gpTermHead;
|
---|
| 520 | _smutex_release(&gsmtxTerm);
|
---|
| 521 |
|
---|
| 522 | while (pCur)
|
---|
| 523 | {
|
---|
| 524 | /* call it */
|
---|
| 525 | LIBCLOG_MSG("calling %p with %p\n", (void *)pCur->pfnCallback, (void *)pCur);
|
---|
| 526 | pCur->pfnCallback(pCur, fFlags);
|
---|
| 527 |
|
---|
| 528 | /* next */
|
---|
| 529 | if (pCur == pTail)
|
---|
| 530 | break;
|
---|
| 531 | pCur = pCur->pNext;
|
---|
| 532 | }
|
---|
| 533 |
|
---|
| 534 | LIBCLOG_RETURN_VOID();
|
---|
| 535 | }
|
---|
| 536 |
|
---|