Ian,
On the 7800, the default OS is Debian 3.1 (Sarge) which includes and older version of the pthreads library, implementing LinuxThreads. LinuxThreads is not completely POSIX compliant. As a matter of fact, each thread gets it's own process id and shows up under 'top' as a separate process. I can even change the user and group ID for one thread while the other threads retain their originals.
LinuxThreads also has issues with signals, basically, don't use signals with pthreads.
Robert
On Mon, May 3, 2010 at 2:40 PM, Ian Thompson <> wrote:
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Robert
The Linux pthreads man page says that POSIX.1 requires threads to share
user and group IDs!!!
NAME
pthreads - POSIX threads
DESCRIPTION
POSIX.1 specifies a set of interfaces (functions, header files) for
threaded programming commonly known as POSIX threads, or Pthreads. A single
process can contain multiple threads, all of which are executing the
same program. These threads share the same global memory (data and heap segâ
ments), but each thread has its own stack (automatic variables).
POSIX.1 also requires that threads share a range of other attributes
(i.e., these attributes are process-wide rather than per-thread):
- process ID
- parent process ID
- process group ID and session ID
- controlling terminal
- user and group IDs
etc, etc.
The man pages also say that seteuid conforms to POSIX.1-2001, so it
SHOULD be thread safe. Perhaps you have found a bug in the ARM
implementation.
Ian T.
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-- Robert Ulbrich Software Developer CAPSHER Technology, Inc. 1604 Crescent Pointe Pkwy. 979.776.7520 x150
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