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Top Forums Programming Problem with pthread_delay_np Post 302435080 by fpmurphy on Tuesday 6th of July 2010 10:24:35 AM
Old 07-06-2010
Quote:
The pthread_delay_np function exists on Tru64 UNIX, but not on HP-UX.
Yes, that is what the Tru64 to HP-UX STK (Software Transition Kit) documentation says but is not actually true. At the time HP-UX was trying to encourage users of DCE threads and CMA threads to migrate to POSIX threads. Look at any of the older HP-UX documentation and you will find pthread_delay_np.
 

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pthread_attr_setscope(3)				     Library Functions Manual					  pthread_attr_setscope(3)

NAME
pthread_attr_setscope - Sets the contention scope attribute of the specified thread attributes object. LIBRARY
DECthreads POSIX 1003.1c Library (libpthread.so) SYNOPSIS
#include <pthread.h> int pthread_attr_setscope( pthread_attr_t *attr, int scope); STANDARDS
Interfaces documented on this reference page conform to industry standards as follows: IEEE Std 1003.1c-1995, POSIX System Application Program Interface PARAMETERS
Address of the thread attributes object whose contention scope attribute is to be modified. New value for the contention scope attribute of the thread attributes object specified by attr. DESCRIPTION
This routine uses the value specified in the scope argument to set the contention scope attribute of the thread attributes object specified in the attr argument. When creating a thread, use a thread attributes object to specify nondefault values for thread attributes. The contention scope attribute specifies the set of threads with which a thread must compete for processing resources. The contention scope attribute specifies whether the new thread competes for processing resources only with other threads in its own process, called process contention scope, or with all threads on the system, called system contention scope. On Tru64 UNIX, DECthreads supports both process contention scope and system contention scope threads. DECthreads selects at most one thread to execute on each processor at any point in time. DECthreads resolves the contention based on each thread's scheduling attributes (for example, priority) and scheduling policy (for example, round-robin). A thread created using a thread attributes object whose contention scope attribute is set to PTHREAD_SCOPE_PROCESS contends for processing resources with other threads within its own process that also were created with PTHREAD_SCOPE_PROCESS. It is unspecified how such threads are scheduled relative to threads in other processes or threads in the same process that were created with PTHREAD_SCOPE_SYSTEM contention scope. A thread created using a thread attributes object whose contention scope attribute is set to PTHREAD_SCOPE_SYSTEM contends for processing resources with other threads in any process that also were created with PTHREAD_SCOPE_SYSTEM. NOTES
The value of the contention scope attribute of a particular thread attributes object does not necessarily correspond to the actual schedul- ing contention scope of any existing thread in your multithreaded program. 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 attr is not a valid thread attributes value, or the value specified by scope is not valid. An attempt was made to set the attribute to an unsupported value. ERRORS
None RELATED INFORMATION
Functions: pthread_attr_destroy(3), pthread_attr_init(3), pthread_attr_getscope(3), pthread_create(3) Manuals: Guide to DECthreads and Programmer's Guide delim off pthread_attr_setscope(3)
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