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pthread_setcanceltype()

Set a thread's cancellation type

Synopsis:

#include <pthread.h>

int pthread_setcanceltype( int type,
                           int* oldtype );

Arguments:

type

The new cancellation type.

oldtype

A pointer to a location where the function can store the old cancellation type.

Library:

libc

Use the -l c option to qcc to link against this library. This library is usually included automatically.

Description:

The pthread_setcanceltype() function sets the calling thread's cancellation type to type and returns the previous cancellation type in oldtype.

The cancellation type can have the following values:

PTHREAD_CANCEL_ASYNCHRONOUS

If cancellation is enabled, new or pending cancellation requests may be acted on immediately.

PTHREAD_CANCEL_DEFERRED

If cancellation is enabled, cancellation requests are held pending until a cancellation point.

The default cancellation state for a thread is PTHREAD_CANCEL_DEFERRED. Note that the standard POSIX and C library calls aren't asynchronous-cancellation safe.

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You can set this attribute (in a non-POSIX way) before creating the thread; for more information, see "QNX extensions," in the documentation for pthread_create().

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Returns:

EOK

Success.

EINVAL

Invalid cancelability type type.

Classification:

POSIX 1003.1 THR

Safety:
Cancellation point	No
Interrupt handler	No
Signal handler	Yes
Thread	Yes

See also:

pthread_cancel(), pthread_setcancelstate(), pthread_testcancel()

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