| PTHREAD_SUSPEND_NP(3) | Library Functions Manual | PTHREAD_SUSPEND_NP(3) | 
pthread_suspend_np,
  pthread_resume_np —
#include <pthread.h>
int
  
  pthread_suspend_np(pthread_t
    thread);
int
  
  pthread_resume_np(pthread_t
    thread);
pthread_suspend_np() function suspends the
  thread given as argument. If
  thread is the currently running thread as returned by
  pthread_self(3), the
  function fails and returns EDEADLK. Otherwise, it
  removes the named thread from the running queue, and adds it to the suspended
  queue. The thread will remain blocked until
  pthread_resume_np() is called on it. In other words,
  pthread_resume_np() resumes the
  thread given as argument, if it was suspended.
pthread_suspend_np() function may fail if:
EDEADLK]ESRCH]The pthread_resume_np() function may fail
    if:
ESRCH]pthread_suspend_np() implementations may allow
  suspending the current thread. This is dangerous, because the semantics of the
  function would then require the scheduler to schedule another thread, causing
  a thread context switch. Since that context switch can happen in a signal
  handler by someone calling pthread_suspend_np() in a
  signal handler, this is currently not allowed.
In pthread_resume_np() the
    NetBSD implementation does not check if the
    thread argument is not already suspended. Some
    implementations might return an error condition if
    pthread_resume_np() is called on a non-suspended
    thread.
| July 9, 2010 | NetBSD 10.0 |