From 25f22702f153d62b55cb276152ba5ea935023e6e Mon Sep 17 00:00:00 2001 From: Agustina Arzille Date: Wed, 1 Feb 2017 12:32:52 -0300 Subject: Implement basic sleeping locks for gnumach * kern/atomic.h: New file. * kern/kmutex.h: New file. * kern/kmutex.c: New file. * Makefrag.am (libkernel_a_SOURCES): Add atomic.h, kmutex.h, kmutex.c. * kern/sched_prim.h (thread_wakeup_prim): Make it return boolean_t. * kern/sched_prim.c (thread_wakeup_prim): Return TRUE if we woke a thread, and FALSE otherwise. --- kern/kmutex.h | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 52 insertions(+) create mode 100644 kern/kmutex.h (limited to 'kern/kmutex.h') diff --git a/kern/kmutex.h b/kern/kmutex.h new file mode 100644 index 00000000..29815156 --- /dev/null +++ b/kern/kmutex.h @@ -0,0 +1,52 @@ +/* Copyright (C) 2017 Free Software Foundation, Inc. + Contributed by Agustina Arzille , 2017. + + This program 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. + + This program 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 this program; if not, see + . +*/ + +#ifndef _KERN_KMUTEX_H_ +#define _KERN_KMUTEX_H_ 1 + +#include +#include + +struct kmutex +{ + unsigned int state; + decl_simple_lock_data (, lock) +}; + +/* Possible values for the mutex state. */ +#define KMUTEX_AVAIL 0 +#define KMUTEX_LOCKED 1 +#define KMUTEX_CONTENDED 2 + +/* Initialize mutex in *MTXP. */ +extern void kmutex_init (struct kmutex *mtxp); + +/* Acquire lock MTXP. If INTERRUPTIBLE is true, the sleep may be + * prematurely terminated, in which case the function returns + * KERN_INTERRUPTED. Otherwise, KERN_SUCCESS is returned. */ +extern kern_return_t kmutex_lock (struct kmutex *mtxp, + boolean_t interruptible); + +/* Try to acquire the lock MTXP without sleeping. + * Returns KERN_SUCCESS if successful, KERN_FAILURE otherwise. */ +extern kern_return_t kmutex_trylock (struct kmutex *mtxp); + +/* Unlock the mutex MTXP. */ +extern void kmutex_unlock (struct kmutex *mtxp); + +#endif -- cgit v1.2.3