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Dd July 9, 2010
Dt PTHREAD_SUSPEND_NP 3
Os
Sh NAME
Nm pthread_suspend_np ,
Nm pthread_resume_np
Nd suspend/resume the given thread
Sh LIBRARY
Lb libpthread
Sh SYNOPSIS
In pthread.h
Ft int
Fn pthread_suspend_np "pthread_t thread"
Ft int
Fn pthread_resume_np "pthread_t thread"
Sh DESCRIPTION
The
Fn pthread_suspend_np
function suspends the
Fa thread
given as argument.
If
Fa thread
is the currently running thread as returned by
Xr pthread_self 3 ,
the function fails and returns
Er EDEADLK .
Otherwise, it removes the named thread from the running queue, and
adds it to the suspended queue.
The
Fa thread
will remain blocked until
Fn pthread_resume_np
is called on it.
In other words,
Fn pthread_resume_np
resumes the
Fa thread
given as argument, if it was suspended.
Sh RETURN VALUES
Both functions return 0 on success and an error number indicating the
reason for the failure.
Sh COMPATIBILITY
These functions are non-standard extensions.
Sh ERRORS
The
Fn pthread_suspend_np
function may fail if:
Bl -tag -width Er
It Bq Er EDEADLK
The thread requested to suspend was the currently running thread.
It Bq Er ESRCH
The supplied
Fa thread
was invalid.
El
Pp
The
Fn pthread_resume_np
function may fail if:
Bl -tag -width Er
It Bq Er ESRCH
The supplied
Fa thread
was invalid.
El
Sh NOTES
Some
Fn 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
Fn pthread_suspend_np
in a signal handler, this is currently not allowed.
Pp
In
Fn pthread_resume_np
the
Nx
implementation does not check if the
Fa thread
argument is not already suspended.
Some implementations might return an error condition if
Fn pthread_resume_np
is called on a non-suspended thread.
Sh SEE ALSO
Xr pthread_attr_setcreatesuspend_np 3 ,
Xr pthread_self 3

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