Date: Fri, 7 May 1999 21:26:46 +0100 (BST) From: Doug Rabson <dfr@nlsystems.com> To: Matthew Dillon <dillon@apollo.backplane.com> Cc: current@FreeBSD.ORG Subject: Re: Debugging FreeBSD user threads with gdb Message-ID: <Pine.BSF.4.05.9905072123330.10400-100000@herring.nlsystems.com> In-Reply-To: <199905072010.NAA46817@apollo.backplane.com>
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On Fri, 7 May 1999, Matthew Dillon wrote:
> :--- uthread_create.c 1999/03/23 05:07:55 1.12
> :+++ uthread_create.c 1999/05/06 15:27:33
> :@@ -42,6 +42,8 @@
> : #include "pthread_private.h"
> : #include "libc_private.h"
> :
> :+static int next_tid = 1;
> :+
> : int
> : pthread_create(pthread_t * thread, const pthread_attr_t * attr,
> : void *(*start_routine) (void *), void *arg)
> :@@ -87,6 +89,7 @@
> : } else {
> : /* Initialise the thread structure: */
> : memset(new_thread, 0, sizeof(struct pthread));
> :+ new_thread->tid = next_tid++;
> :
> :Doug Rabson Mail: dfr@nlsystems.com
> :Nonlinear Systems Ltd. Phone: +44 181 442 9037
>
> Hmmm. tid is only an int and some programs which create and destroy
> threads a lot are almost certainly going to overflow it. 4 billion
> is not hard to reach. This can result in duplicate tid's.
Didn't think of that. It gets a bit ugly inside gdb since gdb needs a
single int to encode the pid and thread id. I'm currently allowing 20
bits for the pid and 11 for the tid. Any ideas?
--
Doug Rabson Mail: dfr@nlsystems.com
Nonlinear Systems Ltd. Phone: +44 181 442 9037
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