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Initialize and destroy the struct proc mutex in the proc zone's init and

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fini routines instead of in fork() and wait().  This has the nice side
benefit that the proc lock of any process on the allproc list is always
valid and sched_lock doesn't have to be used to test against PRS_NEW
anymore.
This commit is contained in:
John Baldwin 2003-05-01 21:16:38 +00:00
parent cbfe6d117c
commit 7d447c956b
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=114461
3 changed files with 6 additions and 5 deletions
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1
sys/kern/kern_exit.c
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@ -685,7 +685,6 @@ wait1(struct thread *td, struct wait_args *uap, int compat)
* release while still running in process context.
*/
vm_waitproc(p);
mtx_destroy(&p->p_mtx);
#ifdef MAC
mac_destroy_proc(p);
#endif

7
sys/kern/kern_fork.c
View File

@ -447,6 +447,9 @@ fork1(td, flags, pages, procp)
if (pages != 0)
pmap_new_altkstack(td2, pages);
PROC_LOCK(p2);
PROC_LOCK(p1);
#define RANGEOF(type, start, end) (offsetof(type, end) - offsetof(type, start))
bzero(&p2->p_startzero,
@ -458,10 +461,6 @@ fork1(td, flags, pages, procp)
bzero(&kg2->kg_startzero,
(unsigned) RANGEOF(struct ksegrp, kg_startzero, kg_endzero));
mtx_init(&p2->p_mtx, "process lock", NULL, MTX_DEF | MTX_DUPOK);
PROC_LOCK(p2);
PROC_LOCK(p1);
bcopy(&p1->p_startcopy, &p2->p_startcopy,
(unsigned) RANGEOF(struct proc, p_startcopy, p_endcopy));
bcopy(&td->td_startcopy, &td2->td_startcopy,

3
sys/kern/kern_proc.c
View File

@ -194,6 +194,8 @@ proc_init(void *mem, int size)
ke = kse_alloc();
kg = ksegrp_alloc();
proc_linkup(p, kg, ke, td);
bzero(&p->p_mtx, sizeof(struct mtx));
mtx_init(&p->p_mtx, "process lock", NULL, MTX_DEF | MTX_DUPOK);
}
/*
@ -220,6 +222,7 @@ proc_fini(void *mem, int size)
thread_free(td);
ksegrp_free(kg);
kse_free(ke);
mtx_destroy(&p->p_mtx);
}
/*