| 1 | /* $Id: shthread.h 3515 2021-12-16 12:54:03Z bird $ */
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| 2 | /** @file
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| 3 | *
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| 4 | * Shell thread methods.
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| 5 | *
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| 6 | * Copyright (c) 2007-2010 knut st. osmundsen <[email protected]>
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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 | #ifndef ___shthread_h___
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| 28 | #define ___shthread_h___
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| 29 |
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| 30 | #include "shtypes.h"
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| 31 |
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| 32 | typedef union shmtx
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| 33 | {
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| 34 | char b[64];
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| 35 | KU64 au64[64/sizeof(KU64)];
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| 36 | void *aptrs[64/sizeof(void *)];
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| 37 | } shmtx;
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| 38 |
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| 39 | /** Magic mutex value (final u64).
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| 40 | * This is used to detect whether the mutex has been initialized or not,
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| 41 | * allowing shmtx_delete to be called more than once without doing harm.
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| 42 | * @internal */
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| 43 | #define SHMTX_MAGIC KU64_C(0x8888000019641018) /**< Charles Stross */
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| 44 | /** Index into shmtx::au64 of the SHMTX_MAGIC value.
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| 45 | * @internal */
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| 46 | #define SHMTX_MAGIC_IDX (sizeof(shmtx) / sizeof(KU64) - 1)
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| 47 |
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| 48 | typedef struct shmtxtmp { int i; } shmtxtmp;
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| 49 |
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| 50 | typedef uintptr_t shtid;
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| 51 |
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| 52 | void shthread_set_shell(struct shinstance *);
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| 53 | struct shinstance *shthread_get_shell(void);
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| 54 | void shthread_set_name(const char *name);
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| 55 |
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| 56 | int shmtx_init(shmtx *pmtx);
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| 57 | void shmtx_delete(shmtx *pmtx);
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| 58 | void shmtx_enter(shmtx *pmtx, shmtxtmp *ptmp);
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| 59 | void shmtx_leave(shmtx *pmtx, shmtxtmp *ptmp);
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| 60 |
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| 61 |
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| 62 | K_INLINE unsigned sh_atomic_inc(KU32 volatile *valuep)
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| 63 | {
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| 64 | #ifdef _MSC_VER
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| 65 | return _InterlockedIncrement((long *)valuep);
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| 66 | #elif defined(__GNUC__) && (K_ARCH == K_ARCH_AMD64 || K_ARCH == K_ARCH_X86_32)
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| 67 | unsigned uRet;
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| 68 | __asm__ __volatile__("lock; xaddl %1, %0" : "=m" (*valuep), "=r" (uRet) : "m" (*valuep), "1" (1) : "memory", "cc");
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| 69 | return uRet + 1;
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| 70 | #else
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| 71 | return __sync_add_and_fetch(valuep, 1);
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| 72 | #endif
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| 73 | }
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| 74 |
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| 75 | K_INLINE unsigned sh_atomic_dec(unsigned volatile *valuep)
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| 76 | {
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| 77 | #ifdef _MSC_VER
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| 78 | return _InterlockedDecrement((long *)valuep);
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| 79 | #elif defined(__GNUC__) && (K_ARCH == K_ARCH_AMD64 || K_ARCH == K_ARCH_X86_32)
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| 80 | unsigned uRet;
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| 81 | __asm__ __volatile__("lock; xaddl %1, %0" : "=m" (*valuep), "=r" (uRet) : "m" (*valuep), "1" (-1) : "memory", "cc");
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| 82 | return uRet - 1;
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| 83 | #else
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| 84 | return __sync_sub_and_fetch(valuep, 1);
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| 85 | #endif
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| 86 | }
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| 87 |
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| 88 | #endif
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| 89 |
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