Hallo, dies ist ein Test.

PWD: /www/data-lst1/unixsoft/unixsoft/kaempfer/.public_html

Running in File Mode
Relative path: ./../../.././../../../usr/man/man3c/pthread_getconcurrency.3c
Real path: /usr/share/man/man3c/pthread_getconcurrency.3c
Zurück

'\" te .\" Copyright (c) 2008, 2014, Oracle and/or its affiliates. All rights reserved. .\" Copyright (c) 2001, the Institute of Electrical and Electronics Engineers, Inc. and The Open Group. All rights reserved. .\" Copyright (c) 1991, 1992, 1994, The X/Open Company Ltd. All rights reserved. .\" Oracle gratefully acknowledges The Open Group for permission to reproduce portions of its copyrighted documentation. Original documentation from The Open Group can be obtained online at http://www.opengroup.org/bookstore/. .\" The Institute of Electrical and Electronics Engineers and The Open Group, have given us permission to reprint portions of their documentation. In the following statement, the phrase "this text" refers to portions of the system documentation. Portions of this text are reprinted and reproduced in electronic form in the Sun OS Reference Manual, from IEEE Std 1003.1, 2004 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2004 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between these versions and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html. This notice shall appear on any product containing this material. .TH pthread_getconcurrency 3C "16 May 2014" "Oracle Solaris 11.4" "Standard C Library Functions" .SH NAME pthread_getconcurrency, pthread_setconcurrency \- get or set level of concurrency .SH SYNOPSIS .LP .nf #include <pthread.h> \fBint\fR \fBpthread_getconcurrency\fR(\fBvoid\fR); .fi .LP .nf \fBint\fR \fBpthread_setconcurrency\fR(\fBint\fR \fInew_level\fR); .fi .SH DESCRIPTION .sp .LP Unbound threads in a process may or may not be required to be simultaneously active. By default, the threads implementation ensures that a sufficient number of threads are active so that the process can continue to make progress. While this conserves system resources, it may not produce the most effective level of concurrency. .sp .LP The \fBpthread_setconcurrency()\fR function allows an application to inform the threads implementation of its desired concurrency level, \fInew_level\fR. The actual level of concurrency provided by the implementation as a result of this function call is unspecified. .sp .LP If \fInew_level\fR is \fB0\fR, it causes the implementation to maintain the concurrency level at its discretion as if \fBpthread_setconcurrency()\fR was never called. .sp .LP The \fBpthread_getconcurrency()\fR function returns the value set by a previous call to the \fBpthread_setconcurrency()\fR function. If the \fBpthread_setconcurrency()\fR function was not previously called, this function returns \fB0\fR to indicate that the implementation is maintaining the concurrency level. .sp .LP When an application calls \fBpthread_setconcurrency()\fR it is informing the implementation of its desired concurrency level. The implementation uses this as a hint, not a requirement. .sp .LP If an implementation does not support multiplexing of user threads on top of several kernel scheduled entities, the \fBpthread_setconcurrency()\fR and \fBpthread_getconcurrency()\fR functions will be provided for source code compatibility but they will have no effect when called. To maintain the function semantics, the \fInew_level\fR parameter will be saved when \fBpthread_setconcurrency()\fR is called so that a subsequent call to \fBpthread_getconcurrency()\fR returns the same value. .SH RETURN VALUES .sp .LP If successful, the \fBpthread_setconcurrency()\fR function returns \fB0\fR. Otherwise, an error number is returned to indicate the error. .sp .LP The \fBpthread_getconcurrency()\fR function always returns the concurrency level set by a previous call to \fBpthread_setconcurrency()\fR. If the \fBpthread_setconcurrency()\fR function has never been called, \fBpthread_getconcurrency()\fR returns \fB0\fR. .SH ERRORS .sp .LP The \fBpthread_setconcurrency()\fR function will fail if: .sp .ne 2 .mk .na \fB\fBEINVAL\fR\fR .ad .RS 10n .rt The value specified by \fInew_level\fR is negative. .RE .sp .ne 2 .mk .na \fB\fBEAGAIN\fR\fR .ad .RS 10n .rt The value specific by \fInew_level\fR would cause a system resource to be exceeded. .RE .SH ATTRIBUTES .sp .LP See \fBattributes\fR(7) for descriptions of the following attributes: .sp .TS tab( ) box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) . ATTRIBUTE TYPE ATTRIBUTE VALUE _ Interface Stability Committed _ MT-Level MT-Safe _ Standard See \fBstandards\fR(7). .TE .sp .SH SEE ALSO .sp .LP \fBpthread_attr_init\fR(3C), \fBpthread_create\fR(3C), \fBattributes\fR(7), \fBstandards\fR(7)