From: kosaki.motohiro@...
Date: 2014-06-11T21:05:56+00:00
Subject: [ruby-core:63111] [ruby-trunk - Bug #9884] thread_pthread.c assumes pthread_t is a scalar type

Issue #9884 has been updated by Motohiro KOSAKI.


Just curious. Where is the phrase that describes pthread_t is opaque?

I skimmed current SUS.

sys/types.h contain pthread_t definition.

http://pubs.opengroup.org/onlinepubs/7908799/xsh/systypes.h.html

with following explanation.

"All of the types are defined as arithmetic types of an appropriate length, with the following exceptions: key_t, pthread_attr_t, pthread_cond_t, pthread_condattr_t, pthread_key_t, pthread_mutex_t, pthread_mutexattr_t, pthread_once_t, pthread_rwlock_t and pthread_rwlockattr_t. "

The exception list doesn't include pthread_t. So, I doubt current SUS agree your opinion. 


----------------------------------------
Bug #9884: thread_pthread.c assumes pthread_t is a scalar type
https://bugs.ruby-lang.org/issues/9884#change-47176

* Author: Rei Odaira
* Status: Closed
* Priority: Normal
* Assignee: 
* Category: 
* Target version: 
* ruby -v: ruby 2.2.0dev (2014-05-30 trunk 46238) [x86_64-linux]
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN
----------------------------------------
Many code lines in `thread_pthread.c` assume `pthread_t` is a scalar type. For example,

~~~
    thread_debug("ubf_select_each (%p)\n", (void *)th->thread_id);
~~~

and

~~~
    if (!timer_thread_id) {
~~~

I don't think the standard guarantees `pthread_t` is a scalar type.  z/OS defines `pthread_t` as a struct, and there seem to be other such environments.
https://sourceware.org/pthreads-win32/faq.html

I understand it could be too cumbersome to rewrite the source, assuming `pthread_t` might not be a scalar, and actually I am not sure what would be the best way to rewrite it, but I appreciate it if you guys could think of it for the maximum portability. If needed, I am willing to list the source lines to be rewritten.

---Files--------------------------------
opaque_thread_id.patch (7.63 KB)


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