pthread_getconcurrency man page on FreeBSD

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PTHREAD_GETCONCURRENC... BSD Library Functions Manual PTHREAD_GETCONCURRENC...

NAME
     pthread_getconcurrency, pthread_setconcurrency — get or set level of con‐
     currency

LIBRARY
     POSIX Threads Library (libpthread, -lpthread)

SYNOPSIS
     #include <pthread.h>

     int
     pthread_getconcurrency(void);

     int
     pthread_setconcurrency(int new_level);

DESCRIPTION
     The pthread_getconcurrency() function allows an application to inform the
     threads implementation of its desired concurrency level, new_level.  The
     actual level of concurrency provided by the implementation as a result of
     this function call is unspecified.	 If new_level is zero, it causes the
     implementation to maintain the concurrency level at its discretion as if
     pthread_setconcurrency() was never called.	 The pthread_getconcurrency()
     function returns the value set by a previous call to the
     pthread_setconcurrency() function.	 If the pthread_setconcurrency() func‐
     tion was not previously called, this function returns zero to indicate
     that the implementation is maintaining the concurrency level.  When an
     application calls pthread_setconcurrency(), it is informing the implemen‐
     tation of its desired concurrency level.  The implementation uses this as
     a hint, not a requirement.

RETURN VALUES
     If successful, the pthread_setconcurrency() function returns zero.	 Oth‐
     erwise, an error number is returned to indicate the error.	 The
     pthread_getconcurrency() function always returns the concurrency level
     set by a previous call to pthread_setconcurrency().  If the
     pthread_setconcurrency() function has never been called,
     pthread_getconcurrency() returns zero.

ERRORS
     The pthread_setconcurrency() function will fail if:

     [EINVAL]		The value specified by new_level is negative.

     [EAGAIN]		The value specified by new_level would cause a system
			resource to be exceeded.

APPLICATION USAGE
     Use of these functions changes the state of the underlying concurrency
     upon which the application depends.  Library developers are advised to
     not use the pthread_getconcurrency() and pthread_setconcurrency() func‐
     tions since their use may conflict with an application's use of these
     functions.

STANDARDS
     The pthread_getconcurrency() and pthread_setconcurrency() functions con‐
     form to Version 2 of the Single UNIX Specification (“SUSv2”).

BSD				April 11, 2003				   BSD
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