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glibc  2.9
pthread_timedjoin.c File Reference
#include <errno.h>
#include <stdlib.h>
#include <atomic.h>
#include "pthreadP.h"

Go to the source code of this file.


static void cleanup (void *arg)
int pthread_timedjoin_np (pthread_t threadid, void **thread_return, const struct timespec *abstime)

Function Documentation

static void cleanup ( void *  arg) [static]

Definition at line 27 of file pthread_timedjoin.c.

  *(void **) arg = NULL;
int pthread_timedjoin_np ( pthread_t  threadid,
void **  thread_return,
const struct timespec abstime 

Definition at line 34 of file pthread_timedjoin.c.

  struct pthread *self;
  struct pthread *pd = (struct pthread *) threadid;
  int result;

  /* Make sure the descriptor is valid.  */
    /* Not a valid thread handle.  */
    return ESRCH;

  /* Is the thread joinable?.  */
  if (IS_DETACHED (pd))
    /* We cannot wait for the thread.  */
    return EINVAL;

  self = THREAD_SELF;
  if (pd == self || self->joinid == pd)
    /* This is a deadlock situation.  The threads are waiting for each
       other to finish.  Note that this is a "may" error.  To be 100%
       sure we catch this error we would have to lock the data
       structures but it is not necessary.  In the unlikely case that
       two threads are really caught in this situation they will
       deadlock.  It is the programmer's problem to figure this
       out.  */
    return EDEADLK;

  /* Wait for the thread to finish.  If it is already locked something
     is wrong.  There can only be one waiter.  */
  if (__builtin_expect (atomic_compare_and_exchange_bool_acq (&pd->joinid,
                                                       self, NULL), 0))
    /* There is already somebody waiting for the thread.  */
    return EINVAL;

  /* During the wait we change to asynchronous cancellation.  If we
     are cancelled the thread we are waiting for must be marked as
     un-wait-ed for again.  */
  pthread_cleanup_push (cleanup, &pd->joinid);

  /* Switch to asynchronous cancellation.  */
  int oldtype = CANCEL_ASYNC ();

  /* Wait for the child.  */
  result = lll_timedwait_tid (pd->tid, abstime);

  /* Restore cancellation mode.  */
  CANCEL_RESET (oldtype);

  /* Remove the handler.  */
  pthread_cleanup_pop (0);

  /* We might have timed out.  */
  if (result == 0)
      /* Store the return value if the caller is interested.  */
      if (thread_return != NULL)
       *thread_return = pd->result;

      /* Free the TCB.  */
      __free_tcb (pd);
    pd->joinid = NULL;

  return result;

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