102 lines
3.6 KiB
C
102 lines
3.6 KiB
C
/*
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* Copyright (c) 2013
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* The President and Fellows of Harvard College.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE UNIVERSITY AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE UNIVERSITY OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef _PROC_H_
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#define _PROC_H_
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/*
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* Definition of a process.
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*
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* Note: curproc is defined by <current.h>.
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*/
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#include <spinlock.h>
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struct addrspace;
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struct thread;
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struct vnode;
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/*
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* Process structure.
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*
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* Note that we only count the number of threads in each process.
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* (And, unless you implement multithreaded user processes, this
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* number will not exceed 1 except in kproc.) If you want to know
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* exactly which threads are in the process, e.g. for debugging, add
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* an array and a sleeplock to protect it. (You can't use a spinlock
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* to protect an array because arrays need to be able to call
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* kmalloc.)
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*
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* You will most likely be adding stuff to this structure, so you may
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* find you need a sleeplock in here for other reasons as well.
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* However, note that p_addrspace must be protected by a spinlock:
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* thread_switch needs to be able to fetch the current address space
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* without sleeping.
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*/
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struct proc {
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char *p_name; /* Name of this process */
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struct spinlock p_lock; /* Lock for this structure */
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unsigned p_numthreads; /* Number of threads in this process */
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/* VM */
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struct addrspace *p_addrspace; /* virtual address space */
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/* VFS */
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struct vnode *p_cwd; /* current working directory */
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/* add more material here as needed */
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};
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/* This is the process structure for the kernel and for kernel-only threads. */
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extern struct proc *kproc;
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/* Call once during system startup to allocate data structures. */
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void proc_bootstrap(void);
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/* Create a fresh process for use by runprogram(). */
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struct proc *proc_create_runprogram(const char *name);
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/* Destroy a process. */
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void proc_destroy(struct proc *proc);
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/* Attach a thread to a process. Must not already have a process. */
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int proc_addthread(struct proc *proc, struct thread *t);
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/* Detach a thread from its process. */
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void proc_remthread(struct thread *t);
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/* Fetch the address space of the current process. */
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struct addrspace *proc_getas(void);
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/* Change the address space of the current process, and return the old one. */
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struct addrspace *proc_setas(struct addrspace *);
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#endif /* _PROC_H_ */
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