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  man pages->Tru64 Unix man pages -> pthread_setconcurrency (3)              



NAME    [Toc]    [Back]

       pthread_setconcurrency  - Changes the value of the concurrency
 level global variable for this process

SYNOPSIS    [Toc]    [Back]

       #include <pthread.h>

       int pthread_setconcurrency(
               int level );

LIBRARY    [Toc]    [Back]

       DECthreads POSIX 1003.1c Library (libpthread.so)

STANDARDS    [Toc]    [Back]

       Interfaces documented on this reference  page  conform  to
       industry standards as follows:

       IEEE  Std  1003.1c-1995,  POSIX System Application Program

PARAMETERS    [Toc]    [Back]

       New value for the concurrency level for this process.

DESCRIPTION    [Toc]    [Back]

       This routine stores the value specified in the level argument
  in  the  "concurrency  level" global setting for the
       calling thread's process. Because DECthreads automatically
       manages  the concurrency of all threads in a multithreaded
       process, DECthreads ignores this concurrency level  value.

       The  concurrency level value has no effect on the behavior
       of a multithreaded program that uses DECthreads. This routine
  is provided for Single UNIX Specification, Version 2
       source code compatibility and has  no  other  effect  when

       After  calling  this  routine,  subsequent  calls  to  the
       pthread_getconcurrency(3) routine return the  same  value,
       until  another  call  to pthread_setconcurrency(3) changes
       that value.

       The initial concurrency level is zero (0), indicating that
       DECthreads manages the concurrency level. To indicate in a
       portable manner that the implementation is to resume  control
  of concurrency level, call this routine with a level
       argument of zero (0).

       The concurrency level value  can  be  obtained  using  the
       pthread_getconcurrency(3) routine.

RETURN VALUES    [Toc]    [Back]

       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 level is negative.  The value specified
       by level would cause a system resource to be exceeded.

ERRORS    [Toc]    [Back]


SEE ALSO    [Toc]    [Back]

       Functions: pthread_getconcurrency(3)

       Manuals: Guide to DECthreads and Programmer's Guide

[ Back ]
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