pthread_setname_np()

Name a thread

Synopsis:

#include <pthread.h>

int pthread_setname_np(pthread_t tid,
                       const char* newname);


Since:

BlackBerry 10.0.0

Arguments:

tid
The ID of the thread you want to name, or 0 if you want to name the calling thread.
newname
NULL, or a NULL-terminated string that specifies the new name. The maximum length is _NTO_THREAD_NAME_MAX (defined in <sys/neutrino.h>).

Library:

libc

Use the -l c option to qcc to link against this library. This library is usually included automatically.

Description:

The pthread_setname_np() function sets the name of the specified thread to newname. If newname is NULL, the function deletes any name already assigned to the thread. The "np" in the function's name stands for "non-POSIX."

This function is currently implemented as follows:

  • If a thread is setting its own name, pthread_setname_np() uses ThreadCtl().
  • If a thread is setting another thread's name, pthread_setname_np() needs read/write access to the /proc/ pid /as entry for the process.

Only one program can have write access to the a process's entry in the /proc filesystem at a time, so if another program (such as a debugger) already has write access to it, pthread_setname_np() fails with an error of EBUSY. For this reason, it's better to have a thread set its own name than have it set by another thread.

Returns:

EOK
Success.
E2BIG
The name is too long.
EBUSY
As described above, you're trying to name a thread other than the calling thread, and another program already has write access to /proc/ pid /as.
EPERM
You don't have the appropriate permissions to set the name.

Classification:

QNX Neutrino

Safety:  
Cancellation point Yes
Interrupt handler No
Signal handler Yes
Thread Yes

Last modified: 2014-06-24



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