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-.TH PTHREAD_SETCONCURRENCY 3 2014-05-23 "Linux" "Linux Programmer's Manual"
-.SH NAME
-pthread_setconcurrency, pthread_getconcurrency \- set/get
-the concurrency level
-.SH SYNOPSIS
-.nf
-.B #include <pthread.h>
-
-.BI "int pthread_setconcurrency(int " new_level );
-.BI "int pthread_getconcurrency(void);
-.sp
-Compile and link with \fI\-pthread\fP.
-.fi
-.SH DESCRIPTION
-The
-.BR pthread_setconcurrency ()
-function informs the implementation of the application's
-desired concurrency level, specified in
-.IR new_level .
-The implementation takes this only as a hint:
-POSIX.1 does not specify the level of concurrency that
-should be provided as a result of calling
-.BR pthread_setconcurrency ().
-
-Specifying
-.I new_level
-as 0 instructs the implementation to manage the concurrency level
-as it deems appropriate.
-
-.BR pthread_getconcurrency ()
-returns the current value of the concurrency level for this process.
-.SH RETURN VALUE
-On success,
-.BR pthread_setconcurrency ()
-returns 0;
-on error, it returns a nonzero error number.
-
-.BR pthread_getconcurrency ()
-always succeeds, returning the concurrency level set by a previous call to
-.BR pthread_setconcurrency (),
-or 0, if
-.BR pthread_setconcurrency ()
-has not previously been called.
-.SH ERRORS
-.BR pthread_setconcurrency ()
-can fail with the following error:
-.TP
-.B EINVAL
-.I new_level
-is negative.
-.PP
-POSIX.1-2001 also documents an
-.BR EAGAIN
-error ("the value specified by
-.I new_level
-would cause a system resource to be exceeded").
-.SH VERSIONS
-These functions are available in glibc since version 2.1.
-.SH ATTRIBUTES
-.SS Multithreading (see pthreads(7))
-The
-.BR pthread_setconcurrency ()
-and
-.BR pthread_getconcurrency ()
-functions are thread-safe.
-.SH CONFORMING TO
-POSIX.1-2001.
-.SH NOTES
-The default concurrency level is 0.
-
-Concurrency levels are meaningful only for M:N threading implementations,
-where at any moment a subset of a process's set of user-level threads
-may be bound to a smaller number of kernel-scheduling entities.
-Setting the concurrency level allows the application to
-give the system a hint as to the number of kernel-scheduling entities
-that should be provided for efficient execution of the application.
-
-Both LinuxThreads and NPTL are 1:1 threading implementations,
-so setting the concurrency level has no meaning.
-In other words,
-on Linux these functions merely exist for compatibility with other systems,
-and they have no effect on the execution of a program.
-.SH SEE ALSO
-.BR pthread_attr_setscope (3),
-.BR pthreads (7)
-.SH COLOPHON
-This page is part of release 3.79 of the Linux
-.I man-pages
-project.
-A description of the project,
-information about reporting bugs,
-and the latest version of this page,
-can be found at
-\%http://www.kernel.org/doc/man\-pages/.
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