Movatterモバイル変換

pthread_mutexattr_getpshared(3) — Linux manual page

pthread_m...etpshared(3) Library Functions Manualpthread_m...etpshared(3)

NAME        top

       pthread_mutexattr_getpshared, pthread_mutexattr_setpshared -       get/set process-shared mutex attribute

LIBRARY        top

       POSIX threads library (libpthread,-lpthread)

SYNOPSIS        top

#include <pthread.h>int pthread_mutexattr_getpshared(const pthread_mutexattr_t *restrictattr,int *restrictpshared);int pthread_mutexattr_setpshared(pthread_mutexattr_t *attr,intpshared);

DESCRIPTION        top

       These functions get and set the process-shared attribute in a       mutex attributes object.  This attribute must be appropriately set       to ensure correct, efficient operation of a mutex created using       this attributes object.       The process-shared attribute can have one of the following values:PTHREAD_PROCESS_PRIVATE              Mutexes created with this attributes object are to be              shared only among threads in the same process that              initialized the mutex.  This is the default value for the              process-shared mutex attribute.PTHREAD_PROCESS_SHARED              Mutexes created with this attributes object can be shared              between any threads that have access to the memory              containing the object, including threads in different              processes.pthread_mutexattr_getpshared() places the value of the process-       shared attribute of the mutex attributes object referred to byattr in the location pointed to bypshared.pthread_mutexattr_setpshared() sets the value of the process-       shared attribute of the mutex attributes object referred to byattr to the value specified inpshared.       Ifattr does not refer to an initialized mutex attributes object,       the behavior is undefined.

RETURN VALUE        top

       On success, these functions return 0.  On error, they return a       positive error number.

ERRORS        top

pthread_mutexattr_setpshared() can fail with the following errors:EINVALThe value specified inpshared is invalid.ENOTSUPpshared isPTHREAD_PROCESS_SHAREDbut the implementation              does not support process-shared mutexes.

STANDARDS        top

       POSIX.1-2008.

HISTORY        top

       POSIX.1-2001.

SEE ALSO        top

pthread_mutexattr_init(3),pthreads(7)

COLOPHON        top

       This page is part of theman-pages (Linux kernel and C library       user-space interface documentation) project.  Information about       the project can be found at        ⟨https://www.kernel.org/doc/man-pages/⟩.  If you have a bug report       for this manual page, see       ⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.       This page was obtained from the tarball man-pages-6.15.tar.gz       fetched from       ⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on       2025-08-11.  If you discover any rendering problems in this HTML       version of the page, or you believe there is a better or more up-       to-date source for the page, or you have corrections or       improvements to the information in this COLOPHON (which isnot       part of the original manual page), send a mail to       man-pages@man7.orgLinux man-pages 6.15            2025-05-17pthread_m...etpshared(3)

Pages that refer to this page:pthread_mutexattr_init(3)

HTML rendering created 2025-09-06 byMichael Kerrisk, author ofThe Linux Programming Interface. For details of in-depthLinux/UNIX system programming training courses that I teach, lookhere. Hosting byjambit GmbH.