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.TH "PROC_PID_UNHASH" "9" "09 October 2005" "" ""

.SH NAME
proc_pid_unhash \- Unhash /proc/pid entry from the dcache.
.SH SYNOPSIS
"SYNOPSIS"
.sp
\fB
.sp
struct dentry * proc_pid_unhash  (struct task_struct * \fIp\fB);
\fR
.SH "ARGUMENTS"
.TP
\fB\fIp\fB\fR
task that should be flushed.
.SH "DESCRIPTION"
.PP
Drops the /proc/\fIpid\fR dcache entry from the hash chains.
.PP
Dropping /proc/\fIpid\fR entries and detach_pid must be synchroneous,
otherwise e.g. /proc/\fIpid\fR/exe might point to the wrong executable,
if the pid value is immediately reused. This is enforced by
- caller must acquire spin_lock(p->proc_lock)
- must be called before \fBdetach_pid\fR
- proc_pid_lookup acquires proc_lock, and checks that
the target is not dead by looking at the attach count
of PIDTYPE_PID.