PTHREAD_SUSPEND_NP(3)					   BSD Library Functions Manual 				     PTHREAD_SUSPEND_NP(3)

NAME

     pthread_suspend_np, pthread_resume_np -- suspend/resume the given thread

LIBRARY

     POSIX Threads Library (libpthread, -lpthread)

SYNOPSIS

     #include <pthread.h>

     int
     pthread_suspend_np(pthread_t thread);

     int
     pthread_resume_np(pthread_t thread);

DESCRIPTION

     The 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.

RETURN VALUES

     Both functions return 0 on success and an error number indicating the reason for the failure.

COMPATIBILITY

     These functions are non-standard extensions.

ERRORS

     The pthread_suspend_np() function may fail if:

     [EDEADLK]		The thread requested to suspend was the currently running thread.

     [ESRCH]		The supplied thread was invalid.

     The pthread_resume_np() function may fail if:

     [ESRCH]		The supplied thread was invalid.

NOTES

     Some 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 sig-
     nal 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.

SEE ALSO

     pthread_attr_setcreatesuspend_np(3), pthread_self(3)

BSD
								   July 9, 2010 							       BSD