pthread_testcancel(3) Library Functions Manual pthread_testcancel(3)NAME
pthread_testcancel - Requests delivery of a pending cancelation request to the calling thread.
LIBRARY
DECthreads POSIX 1003.1c Library (libpthread.so)
SYNOPSIS
#include <pthread.h>
void pthread_testcancel(void);
STANDARDS
Interfaces documented on this reference page conform to industry standards as follows:
IEEE Std 1003.1c-1995, POSIX System Application Program Interface
PARAMETERS
None
DESCRIPTION
This routine requests delivery of a pending cancelation request to the calling thread. Thus, calling this routine creates a cancelation
point within the calling thread.
The cancelation request is delivered only if a request is pending for the calling thread and the calling thread's cancelability state is
enabled. (A thread disables delivery of cancelation requests to itself by calling pthread_setcancelstate(3).)
When called within very long loops, this routine ensures that a pending cancelation request is noticed by the calling thread within a rea-
sonable amount of time.
RETURN VALUES
None
RELATED INFORMATION
Functions: pthread_setcancelstate(3)
Manuals: Guide to DECthreads and Programmer's Guide
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pthread_testcancel(3)
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pthread_join(3) Library Functions Manual pthread_join(3)NAME
pthread_join - Causes the calling thread to wait for the termination of the specified thread.
LIBRARY
DECthreads POSIX 1003.1c Library (libpthread.so)
SYNOPSIS
#include <pthread.h>
int pthread_join(
pthread_t thread,
void **value_ptr);
STANDARDS
Interfaces documented on this reference page conform to industry standards as follows:
IEEE Std 1003.1c-1995, POSIX System Application Program Interface
PARAMETERS
Thread whose termination is awaited by the calling routine. Return value of the terminating thread (when that thread either calls
pthread_exit(3) or returns from its start routine).
DESCRIPTION
This routine suspends execution of the calling thread until the specified target thread thread terminates.
On return from a successful pthread_join(3) call with a non-NULL value_ptr argument, the value passed to pthread_exit(3) is returned in the
location referenced by value_ptr, and the terminating thread is detached.
If more than one thread attempts to join with the same thread, the results are unpredictable.
A call to pthread_join(3) returns after the target thread terminates. The pthread_join(3) routine is a deferred cancelation point: the
target thread will not be detached if the thread blocked in pthread_join(3) is canceled.
If a thread calls this routine and specifies its own pthread_t, a deadlock can result.
The pthread_join(3) (or pthread_detach(3)) routine should eventually be called for every thread that is created with the detachstate
attribute of its thread attributes object set to PTHREAD_CREATE_JOINABLE, so that storage associated with the thread can be reclaimed.
RETURN VALUES
If an error condition occurs, this routine returns an integer value indicating the type of error. Possible return values are as follows:
Successful completion. The value specified by thread does not refer to a joinable thread. The value specified by thread does not refer to
an existing thread ID. A deadlock was detected, or thread specifies the calling thread.
ERRORS
None
RELATED INFORMATION
Functions: pthread_cancel(3), pthread_create(3), pthread_detach(3), pthread_exit(3)
Manuals: Guide to DECthreads and Programmer's Guide
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pthread_join(3)