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All Rights Reserved. .\" Copyright (c) 2001, The IEEE and The Open Group. All Rights Reserved. .\" Copyright (c) 2008, Sun Microsystems, Inc. All Rights Reserved. .\" .TH PTHREAD_ATTR_INIT 3C "Dec 10, 2015" .SH NAME pthread_attr_init, pthread_attr_destroy \- initialize or destroy threads attribute object .SH SYNOPSIS .LP .nf cc -mt [ \fIflag\fR... ] \fIfile\fR... -lpthread [ \fIlibrary\fR... ] #include \fBint\fR \fBpthread_attr_init\fR(\fBpthread_attr_t *\fR\fIattr\fR); .fi .LP .nf \fBint\fR \fBpthread_attr_destroy\fR(\fBpthread_attr_t *\fR\fIattr\fR); .fi .SH DESCRIPTION .LP The function \fBpthread_attr_init()\fR initializes a thread attributes object \fIattr\fR with the default value for all of the individual attributes used by a given implementation. .sp .LP The resulting attribute object (possibly modified by setting individual attribute values), when used by \fBpthread_create()\fR, defines the attributes of the thread created. A single attributes object can be used in multiple simultaneous calls to \fBpthread_create()\fR. .sp .LP The \fBpthread_attr_init()\fR function initializes a thread attributes object ( \fIattr\fR) with the default value for each attribute as follows: .sp .sp .TS c c c l l l . Attribute Default Value Meaning of Default _ \fIcontentionscope\fR \fBPTHREAD_SCOPE_PROCESS\fR resource competition within process \fIdetachstate\fR \fBPTHREAD_CREATE_JOINABLE\fR joinable by other threads \fIstackaddr\fR \fBNULL\fR stack allocated by system \fIstacksize\fR 0 1 or 2 megabyte \fIpriority\fR 0 priority of the thread \fIpolicy\fR \fBSCHED_OTHER\fR traditional time-sharing policy \fIinheritsched\fR \fBPTHREAD_INHERIT_SCHED\fR T{ scheduling policy and parameters are inherited from the creating thread T} \fIguardsize\fR \fBPAGESIZE\fR T{ size of guard area for a thread's created stack T} .TE .sp .LP The \fBpthread_attr_destroy()\fR function destroys a thread attributes object ( \fIattr\fR), which cannot be reused until it is reinitialized. An implementation may cause \fBpthread_attr_destroy()\fR to set \fIattr\fR to an implementation-dependent invalid value. The behavior of using the attribute after it has been destroyed is undefined. .SH RETURN VALUES .LP Upon successful completion, \fBpthread_attr_init()\fR and \fBpthread_attr_destroy()\fR return a value of \fB0\fR. Otherwise, an error number is returned to indicate the error. .SH ERRORS .LP The \fBpthread_attr_init()\fR function will fail if: .sp .ne 2 .na \fB\fBENOMEM\fR\fR .ad .RS 10n Insufficient memory exists to initialize the thread attributes object. .RE .sp .LP The \fBpthread_attr_destroy()\fR function may fail if: .sp .ne 2 .na \fB\fBEINVAL\fR\fR .ad .RS 10n \fIattr\fR is invalid. .RE .SH ATTRIBUTES .LP See \fBattributes\fR(5) for descriptions of the following attributes: .sp .sp .TS box; c | c l | l . ATTRIBUTE TYPE ATTRIBUTE VALUE _ Interface Stability Committed _ MT-Level MT-Safe _ Standard See \fBstandards\fR(5). .TE .SH SEE ALSO .LP \fBsysconf\fR(3C), \fBpthread_attr_getdetachstate\fR(3C), \fBpthread_attr_get_np\fR(3C), \fBpthread_attr_getguardsize\fR(3C), \fBpthread_attr_getinheritsched\fR(3C), \fBpthread_attr_getschedparam\fR(3C), \fBpthread_attr_getschedpolicy\fR(3C), \fBpthread_attr_getscope\fR(3C), \fBpthread_attr_getstackaddr\fR(3C), \fBpthread_attr_getstacksize\fR(3C), \fBpthread_attr_setdetachstate\fR(3C), \fBpthread_attr_setguardsize\fR(3C), \fBpthread_attr_setinheritsched\fR(3C), \fBpthread_attr_setschedparam\fR(3C), \fBpthread_attr_setschedpolicy\fR(3C), \fBpthread_attr_setscope\fR(3C), \fBpthread_attr_setstackaddr\fR(3C), \fBpthread_attr_setstacksize\fR(3C), \fBpthread_create\fR(3C), \fBattributes\fR(5), \fBstandards\fR(5)