| 1 | /* $Id: shthread.c 3477 2020-09-17 21:52:16Z bird $ */
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| 2 | /** @file
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| 3 | *
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| 4 | * Shell Thread Management.
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| 5 | *
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| 6 | * Copyright (c) 2007-2010 knut st. osmundsen <bird-kBuild-spamx@anduin.net>
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| 7 | *
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| 8 | *
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| 9 | * This file is part of kBuild.
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| 10 | *
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| 11 | * kBuild is free software; you can redistribute it and/or modify
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| 12 | * it under the terms of the GNU General Public License as published by
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| 13 | * 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 | * kBuild 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 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 General Public License
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| 22 | * along with kBuild; 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 | #include "shthread.h"
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| 28 | #include "shinstance.h"
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| 29 |
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| 30 | #if K_OS == K_OS_WINDOWS
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| 31 | # include <Windows.h>
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| 32 | #elif K_OS == K_OS_OS2
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| 33 | # include <InnoTekLIBC/FastInfoBlocks.h>
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| 34 | # include <InnoTekLIBC/thread.h>
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| 35 | #else
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| 36 | # include <pthread.h>
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| 37 | #endif
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| 38 |
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| 39 |
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| 40 | /*******************************************************************************
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| 41 | * Global Variables *
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| 42 | *******************************************************************************/
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| 43 | #if K_OS == K_OS_WINDOWS
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| 44 | static DWORD sh_tls = TLS_OUT_OF_INDEXES;
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| 45 | #elif K_OS == K_OS_OS2
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| 46 | static int sh_tls = -1;
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| 47 | #else
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| 48 | static int sh_tls_inited = 0;
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| 49 | static pthread_key_t sh_tls;
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| 50 | #endif
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| 51 |
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| 52 |
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| 53 | /**
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| 54 | * Stores the shell instance pointer in a TLS entry.
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| 55 | *
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| 56 | * This will allocate the TLS entry on the first call. We assume
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| 57 | * there will no be races at that time.
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| 58 | *
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| 59 | * @param psh The shell instance.
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| 60 | */
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| 61 | void shthread_set_shell(struct shinstance *psh)
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| 62 | {
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| 63 | #if K_OS == K_OS_WINDOWS
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| 64 | if (sh_tls == TLS_OUT_OF_INDEXES)
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| 65 | {
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| 66 | sh_tls = TlsAlloc();
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| 67 | kHlpAssert(sh_tls != TLS_OUT_OF_INDEXES);
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| 68 | }
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| 69 | if (!TlsSetValue(sh_tls, psh))
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| 70 | kHlpAssert(0);
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| 71 |
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| 72 | #elif K_OS == K_OS_OS2
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| 73 | if (sh_tls == -1)
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| 74 | {
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| 75 | sh_tls = __libc_TLSAlloc();
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| 76 | kHlpAssert(sh_tls != -1);
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| 77 | }
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| 78 | if (__libc_TLSSet(sh_tls, psh) == -1)
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| 79 | kHlpAssert(0);
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| 80 | #else
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| 81 | if (!sh_tls_inited)
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| 82 | {
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| 83 | if (pthread_key_create(&sh_tls, NULL) != 0)
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| 84 | kHlpAssert(0);
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| 85 | sh_tls_inited = 1;
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| 86 | }
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| 87 | if (pthread_setspecific(sh_tls, psh) != 0)
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| 88 | kHlpAssert(0);
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| 89 | #endif
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| 90 | }
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| 91 |
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| 92 | /**
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| 93 | * Get the shell instance pointer from TLS.
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| 94 | *
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| 95 | * @returns The shell instance.
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| 96 | */
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| 97 | struct shinstance *shthread_get_shell(void)
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| 98 | {
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| 99 | shinstance *psh;
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| 100 | #if K_OS == K_OS_WINDOWS
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| 101 | psh = (shinstance *)TlsGetValue(sh_tls);
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| 102 | #elif K_OS == K_OS_OS2
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| 103 | psh = (shinstance *)__libc_TLSGet(sh_tls);
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| 104 | #else
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| 105 | psh = (shinstance *)pthread_getspecific(sh_tls);
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| 106 | #endif
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| 107 | return psh;
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| 108 | }
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| 109 |
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