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/* $Id: shthread.h 3515 2021-12-16 12:54:03Z bird $ */
/** @file
*
* Shell thread methods.
*
* Copyright (c) 2007-2010 knut st. osmundsen <bird-kBuild-spamx@anduin.net>
*
*
* This file is part of kBuild.
*
* kBuild is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* kBuild is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with kBuild; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#ifndef ___shthread_h___
#define ___shthread_h___
#include "shtypes.h"
typedef union shmtx
{
char b[64];
KU64 au64[64/sizeof(KU64)];
void *aptrs[64/sizeof(void *)];
} shmtx;
/** Magic mutex value (final u64).
* This is used to detect whether the mutex has been initialized or not,
* allowing shmtx_delete to be called more than once without doing harm.
* @internal */
#define SHMTX_MAGIC KU64_C(0x8888000019641018) /**< Charles Stross */
/** Index into shmtx::au64 of the SHMTX_MAGIC value.
* @internal */
#define SHMTX_MAGIC_IDX (sizeof(shmtx) / sizeof(KU64) - 1)
typedef struct shmtxtmp { int i; } shmtxtmp;
typedef uintptr_t shtid;
void shthread_set_shell(struct shinstance *);
struct shinstance *shthread_get_shell(void);
void shthread_set_name(const char *name);
int shmtx_init(shmtx *pmtx);
void shmtx_delete(shmtx *pmtx);
void shmtx_enter(shmtx *pmtx, shmtxtmp *ptmp);
void shmtx_leave(shmtx *pmtx, shmtxtmp *ptmp);
K_INLINE unsigned sh_atomic_inc(KU32 volatile *valuep)
{
#ifdef _MSC_VER
return _InterlockedIncrement((long *)valuep);
#elif defined(__GNUC__) && (K_ARCH == K_ARCH_AMD64 || K_ARCH == K_ARCH_X86_32)
unsigned uRet;
__asm__ __volatile__("lock; xaddl %1, %0" : "=m" (*valuep), "=r" (uRet) : "m" (*valuep), "1" (1) : "memory", "cc");
return uRet + 1;
#else
return __sync_add_and_fetch(valuep, 1);
#endif
}
K_INLINE unsigned sh_atomic_dec(unsigned volatile *valuep)
{
#ifdef _MSC_VER
return _InterlockedDecrement((long *)valuep);
#elif defined(__GNUC__) && (K_ARCH == K_ARCH_AMD64 || K_ARCH == K_ARCH_X86_32)
unsigned uRet;
__asm__ __volatile__("lock; xaddl %1, %0" : "=m" (*valuep), "=r" (uRet) : "m" (*valuep), "1" (-1) : "memory", "cc");
return uRet - 1;
#else
return __sync_sub_and_fetch(valuep, 1);
#endif
}
#endif
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