pthread_setconcurrency - Online Linux Manual PageSection : 3
Updated : 2022-12-15
Source : Linux man-pages 6.03
NAMEpthread_setconcurrency, pthread_getconcurrency − set/get the concurrency level
LIBRARYPOSIX threads library (libpthread, −lpthread)
SYNOPSIS#include <pthread.h>int pthread_setconcurrency(int new_level);
int pthread_getconcurrency(void);
DESCRIPTIONThe pthread_setconcurrency() function informs the implementation of the application's desired concurrency level, specified in 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 pthread_setconcurrency(). Specifying new_level as 0 instructs the implementation to manage the concurrency level as it deems appropriate. pthread_getconcurrency() returns the current value of the concurrency level for this process.
RETURN VALUEOn success, pthread_setconcurrency() returns 0; on error, it returns a nonzero error number. pthread_getconcurrency() always succeeds, returning the concurrency level set by a previous call to pthread_setconcurrency(), or 0, if pthread_setconcurrency() has not previously been called.
ERRORSpthread_setconcurrency() can fail with the following error: EINVAL new_level is negative. POSIX.1 also documents an EAGAIN error ("the value specified by new_level would cause a system resource to be exceeded").
VERSIONSThese functions are available since glibc 2.1.
ATTRIBUTESFor an explanation of the terms used in this section, see attributes(7). InterfaceAttributeValue pthread_setconcurrency(), pthread_getconcurrency() Thread safetyMT-Safe
STANDARDSPOSIX.1-2001, POSIX.1-2008.
NOTESThe 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.
SEE ALSOpthread_attr_setscope(3), pthreads(7) 0
Johanes Gumabo
Data Size : 9,313 byte
man-pthread_setconcurrency.3Build : 2024-12-29, 07:25 :
Visitor Screen : x
Visitor Counter ( page / site ) : 5 / 260,082
Visitor ID : :
Visitor IP : 18.191.120.103 :
Visitor Provider : AMAZON-02 :
Provider Position ( lat x lon ) : 39.962500 x -83.006100 : x
Provider Accuracy Radius ( km ) : 1000 :
Provider City : Columbus :
Provider Province : Ohio , : ,
Provider Country : United States :
Provider Continent : North America :
Visitor Recorder : Version :
Visitor Recorder : Library :
Online Linux Manual Page : Version : Online Linux Manual Page - Fedora.40 - march=x86-64 - mtune=generic - 24.12.29
Online Linux Manual Page : Library : lib_c - 24.10.03 - march=x86-64 - mtune=generic - Fedora.40
Online Linux Manual Page : Library : lib_m - 24.10.03 - march=x86-64 - mtune=generic - Fedora.40
Data Base : Version : Online Linux Manual Page Database - 24.04.13 - march=x86-64 - mtune=generic - fedora-38
Data Base : Library : lib_c - 23.02.07 - march=x86-64 - mtune=generic - fedora.36
Very long time ago, I have the best tutor, Wenzel Svojanovsky . If someone knows the email address of Wenzel Svojanovsky , please send an email to johanes_gumabo@yahoo.co.id .
If error, please print screen and send to johanes_gumabo@yahoo.co.id
Under development. Support me via PayPal.