RTEMS 4.8.0 On-Line Library

Thread Manager pthread_create - Create a Thread

RTEMS POSIX API User's Guide

17.4.17: pthread_create - Create a Thread

CALLING SEQUENCE:

#include <pthread.h>

int pthread_create(
  pthread_t             *thread,
  const pthread_attr_t  *attr,
  void                 (*start_routine)( void *),
  void                  *arg
);

STATUS CODES:

EINVAL: The attribute set is not initialized.
EINVAL: The user specified a stack address and the size of the area was not large enough to meet this processor's minimum stack requirements.
EINVAL: The specified scheduler inheritance policy was invalid.
ENOTSUP: The specified contention scope was PTHREAD_SCOPE_PROCESS.
EINVAL: The specified thread priority was invalid.
EINVAL: The specified scheduling policy was invalid.
EINVAL: The scheduling policy was SCHED_SPORADIC and the specified replenishment period is less than the initial budget.
EINVAL: The scheduling policy was SCHED_SPORADIC and the specified low priority is invalid.
EAGAIN: The system lacked the necessary resources to create another thread, or the self imposed limit on the total number of threads in a process PTHREAD_THREAD_MAX would be exceeded.
EINVAL: Invalid argument passed.

DESCRIPTION:

The pthread_create routine is used to create a new thread with the attributes specified by attr. If the attr argument is NULL, then the default attribute set will be used. Modification of the contents of attr after this thread is created does not have an impact on this thread.

The thread begins execution at the address specified by start_routine with arg as its only argument. If start_routine returns, then it is functionally equivalent to the thread executing the pthread_exit service.

Upon successful completion, the ID of the created thread is returned in the thread argument.

NOTES:

There is no concept of a single main thread in RTEMS as there is in a tradition UNIX system. POSIX requires that the implicit return of the main thread results in the same effects as if there were a call to exit. This does not occur in RTEMS.

The signal mask of the newly created thread is inherited from its creator and the set of pending signals for this thread is empty.

RTEMS POSIX API User's Guide