Request for review (M): 7132070: Use a mach_port_t as the OSThread thread_id rather than pthread_t on BSD/OSX

[Staffan Larsen]

Reading this again, I wonder: What is the purpose of _ALLBSD_SOURCE in a file under 'src/os/bsd'? Are there platforms that are 'bad', but do not define _ALLBSD_SOURCE? 

/Staffan


On 15 feb 2012, at 16:16, Daniel D. Daugherty wrote:

> The _ALLBSD_SOURCE symbol is defined by the HotSpot Makefile infrastructure.
> It is used to identify code specific to the BSD family of OSes.
> The __APPLE__ symbol is defined by the Apple compiler(s) and it is used to
> identify code specific to MacOS X.
> 
> Typically you'll see something like:
> 
> #ifdef _ALLBSD_SOURCE
> 
> <code that works on all BSDs>
> 
> #ifdef __APPLE__
> <code specific to MacOS X>
> #else
> <code for other BSDs>
> #endif // __APPLE__
> #endif // _ALLBSD_SOURCE
> 
> As for building on non-MacOS X BSDs, that would be nice, but we
> don't have the infrastructure to do it.
> 
> Dan
> 
> On 2/15/12 6:57 AM, Mikael Gerdin wrote:
>> Hi Staffan,
>> 
>> It looks like you're adding Mac-specific stuff like thread_t and calls to ::mach_thread_self() inside _ALLBSD_SOURCE #ifdefs, are you sure this won't break BSD builds?
>> Does the OSX compiler define _ALLBSD_SOURCE or is that for (free|net|open)bsd?
>> It's too bad we don't do regular builds on any of the BSDs, otherwise this would have been easier to figure out.
>> 
>> /Mikael
>> 
>> 
>> On 2012-02-15 11:29, Staffan Larsen wrote:
>>> Please review the following change:
>>> 
>>> Bug: http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=7132070
>>> 
>>> Webrev: http://cr.openjdk.java.net/~sla/7132070/webrev.00/
>>> 
>>> This changes the value returned by OSThread::thread_id() and
>>> os::current_thread_id() on macosx to return the mach thread_t instead of
>>> pthread_t. There is a separate method OSThread:pthread_id() that returns
>>> the pthread_t.
>>> 
>>> The reason for this change is both that JFR would like a 4 byte value
>>> for thread id, and that SA requires access to the thread_t.
>>> 
>>> Thanks,
>>> /Staffan
>>